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WO2007013011A1 - Systeme de detection d'objet - Google Patents

Systeme de detection d'objet Download PDF

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Publication number
WO2007013011A1
WO2007013011A1 PCT/IB2006/052505 IB2006052505W WO2007013011A1 WO 2007013011 A1 WO2007013011 A1 WO 2007013011A1 IB 2006052505 W IB2006052505 W IB 2006052505W WO 2007013011 A1 WO2007013011 A1 WO 2007013011A1
Authority
WO
WIPO (PCT)
Prior art keywords
node
communications
controller
electrode
cross
Prior art date
Application number
PCT/IB2006/052505
Other languages
English (en)
Inventor
Cornelis Van Berkel
David S. George
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2007013011A1 publication Critical patent/WO2007013011A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields

Definitions

  • the present invention relates to object sensing using cross-capacitance sensing, and in particular object sensing systems.
  • Cross-capacitance sensing is also known as electric field sensing.
  • Cross-capacitance sensing which may be termed electric field sensing, uses plural electrodes, and effectively measures the specific capacitance between two electrodes.
  • An electrode to which electric field generating apparatus is connected may be considered to be an electric field sensing transmission electrode (or transmitter electrode), and an electrode to which measuring apparatus is connected may be considered to be an electric field sensing reception electrode (or receiver electrode).
  • the transmitter electrode is excited by application of an alternating voltage.
  • a displacement current is thereby induced in the receiver electrode due to capacitive coupling between the electrodes (i.e. effect of electric field lines). If an object (e.g. finger or hand) is placed near the electrodes (i.e. in the field lines) some of the field lines are terminated by the object and the capacitive current decreases.
  • the present inventors have realised it would be advantageous to provide a flexible integrated or modular cross-capacitance sensing system employing multiple transmitter and receiver electrodes at various locations, e.g. in a room.
  • the present inventors have further realised that a major hindrance to implementing such a system efficiently and flexibly is the aspect of interconnection, especially in a flexible changeable way, between different system parts including transmitter electrodes and receiver electrodes.
  • the present inventors have further realised that a particularly difficult part of the interconnections required would be the connections feeding the alternating voltage to the cross-capacitance current measuring arrangement(s).
  • the present inventors have further realised it would be desirable to remove the need for such connections feeding the alternating voltage to the cross- capacitance current measuring arrangement(s), particularly in the case of flexible integrated or modular systems comprising multiple transmitter electrodes and receiver electrodes.
  • the present invention provides a cross-capacitance object sensing system, comprising: a controller and a plurality of nodes coupled to the controller; the controller comprising controller communications means; each node comprising: (i) at least one of a transmitter electrode and a receiver electrode; (ii) in the case of a receiver electrode, cross-capacitance current measuring means coupled to the receiver electrode; (iii) an alternating voltage source, coupled in the case of a transmitter electrode to the transmitter electrode and in the case of a receiver electrode to the cross-capacitance current measuring means; (iv) node communications means; and (v) timing means; wherein the controller communications means and the node communications means provide communications links between the controller and the respective nodes for communicating timing information to the timing means; and the timing means of a given node are for processing the timing information to synchronise the alternating voltage sources of the given node with the alternating voltage sources of the other nodes.
  • the controller may further comprise means for processing sensing signals output from the cross-capacitance current measuring means and communicated to the controller over the communications link provided by the node communications means and the controller communications means.
  • the controller may control a selection of between which nodes and within which nodes cross-capacitance sensing is performed.
  • At least one of the nodes may comprise location determining means.
  • the present invention provides a cross-capacitance object sensing system, comprising: a transmitter electrode; a first alternating voltage source coupled to the transmitter electrode for providing a first alternating voltage to the transmitter electrode; a receiver electrode; cross- capacitance current measuring means coupled to the receiver electrode; a second alternating voltage source coupled to the current measuring means for providing a second alternating voltage to the cross-capacitance current measuring means; and means for processing timing information such that the first alternating voltage and the second alternating voltage are synchronised.
  • the means for processing timing information may comprise: a controller comprising first communications means; second communications means associated with the transmitter electrode; third communications means associated with the receiver electrode; the first and the second communications means arranged to provide a first communications link for communicating timing instructions; and the first and third communications means arranged to provide a second communications link for communicating the timing instructions.
  • the third communications means may further communicate sensing data provided by the cross-capacitance current measuring means to the controller.
  • At least one of the communications links may be a wireless link.
  • At least one of the communications links may be provided by modulation and demodulation of the electric fields generated between the electrodes of different nodes.
  • the present invention provides a method of operating a cross-capacitance object sensing system according to any of the above mentioned aspects, the method comprising adding one or more nodes to the system and/or removing one or more nodes from the system.
  • the present invention provides a cross-capacitance object sensing system, comprising a controller and a plurality of nodes each having either: (i) one or more transmitter electrodes, or (ii) one or more receiver electrodes, or (iii) one or more transmitter electrodes and one or more receiver electrodes.
  • the controller communicates timing information to the nodes such that respective alternating voltage sources of the different nodes are synchronised with each other.
  • An electric field provided between a transmitter electrode of a first node and a receiver electrode of a second node is measured i.e.
  • a variation in the cross-capacitance current produced at the receiver electrode of the second node is measured, using an alternating voltage provided by the second node and synchronised with the alternating voltage of the first node but without the alternating voltage used in the first node being fed directly to the cross-capacitance current measuring arrangement used to measure the current in the receiver electrode of the second node.
  • the communication of the timing information may be by wireless links.
  • Figure 1 is a schematic illustration of a multi-nodal cross-capacitance object sensing system
  • Figure 2 is a schematic illustration showing in more detail receiving elements of a first node of the system of Figure 1 ;
  • Figure 3 is a schematic illustration of another multi-nodal cross- capacitance object sensing system.
  • Figure 1 is a schematic illustration (not to scale) 1 , according to a first embodiment.
  • the system 1 comprises a controller 2 connected to each of a plurality of sensing nodes, of which three nodes, namely first node 10, second node 20 and third node 30, are shown by way of example in Figure 1.
  • the controller 2 comprises general processing components (not shown), e.g. one or more micro-processors, user inputs, power supply and so on.
  • the controller 2 further comprises a communications module 4.
  • the first node 10 comprises a communications module 12, a timing module 13, a signal generator module 14, a cross-capacitance current measuring module 16, a transmitter electrode 17 and a receiver electrode 18.
  • the receiver electrode 18 is connected to the current measuring module 16.
  • the current measuring module 16 and the transmitter electrode 17 are connected to the signal generator 14.
  • the signal generator module 14 is further connected to the timing module 13.
  • the timing module 13 is further connected to the communications module 12.
  • the communications module 12 of the first node 10 is coupled, via a radio link 11 , to the communications module 4 of the controller 2.
  • the communications module 4 of the controller 2 and the communications module 12 of the first node 10 each comprise radio transmission and reception circuitry and components for establishing and maintaining the radio link 11 between them.
  • the second node 20 comprises a communications module 22, a timing module 23, a signal generator module 24, a current measuring module 26, a transmitter electrode 27 and a receiver electrode 28.
  • the third node 30 comprises a communications module 32, a timing module 33, a signal generator module 34, a cross-capacitance current measuring module 36, a transmitter electrode 37 and a receiver electrode 38.
  • These components of the second node 20 and third node 30 are connected in corresponding fashion to the connections pertaining to the components of the first node 10 as described above, including radio links 21 and 31 coupling the communications module 22 and the communications module 32 respectively to the communications module 4 of the controller 2.
  • the communications modules 22 and 32 each comprise radio transmission and reception circuitry and components for establishing and maintaining the radio link 11 in association with corresponding components of the communications module 4 of the controller 2.
  • radio links 11 , 21 , 31 are established using the
  • the timing modules 13, 23, 33 each comprise a respective real time micro-processor.
  • location modules 15, 25, 35 which are connected to respective communications modules 12, 22, 32.
  • the location modules 15, 25, 35 are optional elements that will be described in more detail later below.
  • the controller 2 controls operation of the various components to provide for cross-capacitance sensing to be performed for one or more transmitter electrode/receiver electrode pairs.
  • sensing is performed between the following pairs: transmitter electrode 17 of the first node 10 with receiver electrode 18 also of the first node 10 (the operation of this pair being represented schematically in Figure 1 by sensing electric field 41 ); transmitter electrode 17 of the first node 10 with receiver electrode 28 of the second node 20 (represented schematically in Figure 1 by sensing electric field 42); transmitter electrode 17 of the first node 10 with receiver electrode 38 of the third node 30 (represented schematically in Figure 1 by sensing electric field 43); transmitter electrode 27 of the second node 20 with receiver electrode 18 of the first node 10 (represented schematically in Figure 1 by sensing electric field 44); transmitter electrode 27 of the second node 20 with receiver electrode 38 of the third node 30 (represented schematically in Figure 1 by sensing electric field 45); and transmitter electrode 37 of the third node 30 with receiver electrode 38 also of the third node 30 (represented schematically in Figure 1 by sensing electric field
  • each of these pairs of transmitter electrodes/receiver electrodes is implemented as described in WO 2003/0021078 A1 , WO 2004/044827 A1 and WO2004/099964 A1 , (the contents of each of which are incorporated herein by reference) except for the modifications described below.
  • the controller 2 processes the respective sensing signal from the different transmitter electrode/receiver electrode pairs to perform overall input processing for the environment sensed by the nodes, e.g. a room, with certain nodes on specific objects, as required. Further details of the operation of the system 1 are as follows. These will be described with reference to first node 10, although the other nodes 20, 30 (and other nodes not shown) operate in corresponding fashion.
  • either one or both of the transmitter electrode and the receiver electrode can be active depending upon instructions from the controller 2.
  • the receiver electrode 18 is connected to the current measuring module 16.
  • the cross-capacitance current measuring module 16 which will be described in more detail below with reference to Figure 3, employs a capacitor charge pump of the type described in WO2004/099964 A1.
  • other current measuring (or sensing) circuits may be employed, for example phase sensitive AC current sensor implemented with analogue device components as described in WO 2003/0021078 A1 , WO 2004/044827 A1.
  • the signal generator module 14 of the first node 10 generates and provides an alternating voltage for the transmitter electrode 17and the receiver electrode 18 of the first node 10. This alternating voltage is provided to the current measuring module 16 and the transmitter electrode 17.
  • an amplifier (not shown) can be provided between the signal generator module 14 and the transmitter electrode 17.
  • the signal generator module 14, and the active state of the transmitter electrode 17 and the receiver electrode 18, are controlled by the timing module 13.
  • the timing module 13 receives instructions from the controller 2 via the communications module 12, i.e. the instructions are communicated from the communications module 4 of the controller 2 to the communications module 12 of the first node 10 via radio link 11 , and then passed from the communications module 12 to the timing module 13.
  • These instructions include the following: instructions as to whether to make both or just one of the transmitter electrode 17 and receiver electrode 18 active; instructions for sending back measurement data; and timing instructions comprising instructions and information about the frequency and phase of the reference signal to be generated by the signal generator module 14.
  • the timing instructions include time stamped synchronisation signals that will allow the signal generator module 14 of the first node 10 to operate in synchronisation with the signal generator modules 24, 34 of the other nodes.
  • the transmitter/receiver pair comprising transmitter electrode 17 of the first node 10 and receiver electrode 28 of the second node 20, operating to sense changes in electric field 42.
  • the alternating voltage provided to the transmitter electrode 17 of the first node is generated and provided by the signal generator module 14 of the first node; whereas the alternating voltage provided to the current measuring module 26 associated with the receiver electrode 28 of the second node 28 is generated and provided by the signal generator module 24 of the second node 20.
  • the alternating voltage provided with respect to sensing changes at the receiver electrode is not, as is the case in conventional arrangements, directly fed to the receiver electrode circuitry. Rather, in a manner allowing flexibility of use of the overall system, and greater possibility to separate electrodes, the alternating voltage provided to the receiver electrode circuitry is provided by a separate signal generator module 24 according to timing instructions received and processed by the timing module 23, these timing instructions, including synchronisation information, being received by the timing module 23 from the communications module 4 of the controller 2 via the radio link 21 and the communications module 22.
  • FIG. 2 is a schematic illustration showing in more detail the receiving elements of the first node 10 of the system 1.
  • the same reference numerals as were used in Figure 1 are again used for the same parts.
  • the cross-capacitance current measuring module 16 comprises a switching circuit 132 connected to the signal generator module 14 and the receiver electrode 18, a direct output connection 134, an analogue to digital converter (ADC) 124, and a converted output connection 146.
  • the direct output connection 134 connects the receiver electrode 18 directly to the input of the ADC 124.
  • the output of the ADC 124 is connected to the converted output connection 146, and this provides the output from of the current measuring module, which in this example is connected to the communications module 12.
  • an alternating voltage 118 is fed from the signal generator module 14 to the switching circuit 132.
  • the alternating voltage 118 is a bipolar square wave of +/-1 OV and frequency 100 kHz.
  • the direct output connection 134 is further coupled to the ADC 124 of the current measuring module 16, such that in operation a data signal 120 is delivered from the receiver electrode 18 to the ADC 124. That is, the data signal will vary according to the presence of an object in the electric field 41 , say.
  • the switching circuit 132 comprises two n-type TFTs, hereinafter referred to as a first n-type TFT 135 and a second n-type TFT 141 ; two p-type TFTs, hereinafter referred to as a first p-type TFT 137 and a second p-type TFT 139; and a capacitor 143.
  • the circuit components are connected as follows.
  • the gates of all four TFTs 135, 137, 139, 141 are connected to each other and to the incoming connection from the alternating voltage source.
  • the TFTs 135,137,139,141 each has, in conventional fashion, two further source/drain terminals (hereinafter referred to as a first and a second terminal) in addition to the gate.
  • one of the source/drain terminals functions as the source of the TFT and the other of the source/drain terminals functions as the drain of the TFT.
  • the question of which source/drain terminal serves as the source and which serves as the drain at any particular moment is determined by the polarity of the applied voltage at that moment.
  • the first terminal of the first n- type TFT 135 and the first terminal of the second p-type TFT 139 are connected to each other and to the receiver electrode 18.
  • the second terminal of the first n-type TFT 135 and the first terminal of the first p-type TFT 137 are connected to each other and to one side (hereinafter referred to as side A) of the capacitor 143.
  • the second terminal of the first p-type TFT 137 and the second terminal of the second n-type TFT 141 are connected to each other and to an earth connection 142.
  • the second terminal of the second p-type TFT 139 and the first terminal of the second n-type TFT 141 are connected to each other and to the other side (hereinafter referred to as side B) of the capacitor 143.
  • the switching circuit 132 operates by effectively operating as two separate circuit parts.
  • the first circuit part comprises the first n-type TFT 135, the capacitor 143 and the second n-type TFT 141.
  • the second circuit part comprises the first p-type TFT 137, the capacitor 143, and the second p- type TFT 139 (note the capacitor 143 is shared by both circuit parts).
  • the two circuit parts are activated alternately in response to the positive and negative cycles of the alternating voltage 118 supplied by the alternating voltage source.
  • Each of the two circuits accumulates charge (from the receiver electrode 18) at the capacitor 143. This charge is accumulated in the same charge sense at the capacitor for each of the two circuits, providing an accumulated voltage which is effectively the data signal 120.
  • the data signal 120 is fed into the ADC 124.
  • the ADC 124 is arranged or controlled to readout the level of the data signal 120 at intervals.
  • the ADC 124 is arranged or controlled to read-out the level of the accumulated voltage 120 signal during the positive part of the cycle of the alternating voltage 118, thus ensuring the voltage is in the correct range of the ADC 124.
  • the resulting read-out provides a converted output signal 126 that is provided from the output of the ADC 124 via the converted output connection 146 to the communications module 12.
  • the communications module 12 then transmits the output level to the communications module 4 of the controller 2.
  • the controller 2 uses the received output level as one input of its overall processing of the multiple inputs from the different nodes of the system 1.
  • the converted output connection 146 may be connected to either the signal generator module 14 or the timing module 13 instead of the communications module 12, in which case the converted output signal 126 is fed back to the communications module 12 from such components using appropriate interfaces for relaying such data.
  • a given receiver electrode may be used to sense electric fields from transmission electrodes of more than one node.
  • this is the case, for example, for receiver electrode 38 of the third node 30, which is sensing three electric fields 43, 45, 46 from respective transmission electrodes 17, 27, 37 of the three respective nodes 10, 20, 30.
  • distinct sensing of the respective different fields can be achieved in any suitable manner.
  • time-multiplexing techniques may be employed, controlled for example by controller 2 including relevant multiplexing timing information in the timing information communicated to the timing modules via the communications modules. Another possibility is that different frequencies may be used for different transmission electrodes.
  • the system 1 is the same, and operates the same, as described above with reference to Figure 1 for the first embodiment, however in this embodiment the system 1 further includes the location modules 15, 25, 35, which are connected to respective communications modules 12, 22, 32.
  • the location modules 15, 25, 35 determine where its respective node is located, either in an absolute sense or in a relative sense compared to the other nodes. Any suitable determination process can be employed, for example in this embodiment a global positioning system (GPS) process is employed. Another possibility is that suitable processing can be employed, for example under the control of controller 2, to derive positional information by performing time-of-f light measurements for communication between the controller 2 and respective communications modules 12, 22, 32.
  • GPS global positioning system
  • suitable processing can be employed, for example under the control of controller 2, to derive positional information by performing time-of-f light measurements for communication between the controller 2 and respective communications modules 12, 22, 32.
  • the above described instructions received by the timing module 13 from the controller 2 via the communications module 12, and/or the output data returned to the processor from the receiving side of a node may additionally
  • location information can be pre-set, or input into the processor, for example by a person implementing the system in a particular setting.
  • each node comprises a separate transmitter electrode and receiver electrode.
  • some or all the nodes may comprise only a transmitter electrode or a receiver electrode.
  • one node may comprise a plurality of transmitter electrodes and/or a plurality of receiver electrodes, the plurality of electrodes of each type being employed in any conventional way in which such a plurality of electrodes is known to be employed, for example as described in WO2004/044827 A1.
  • any given electrode may be employed as both a transmitter electrode and a receiver electrode, such joint operation being divided between transmission and reception on any appropriate time-multiplexed basis.
  • controller 2 different combinations of transmitter electrodes and receiver electrodes are selected by controller 2 for use as transmitter electrode/receiver electrode pairs providing, in the example as shown in Figure 1 , electric sensing fields 41- 45 for the relevant pairs as described above. It is noted that the selection of such pairs is flexible, i.e. any combination of transmitter electrodes may be combined with any combination of receiver electrodes, including within such range of choice the possibility, but not the need, to sense the field between the transmitter electrode and the receiver electrode of a given node (such as field 41 between transmitter electrode 17 and receiver electrode 18 of the first node 10 in the example of Figure 1). Moreover, such selection can be implemented electronically by controller 2, without the need to change any aspect of the infrastructure of the system 1.
  • nodes are added to an existing system by provision of the components of the additional node, along with appropriate updating or reprogramming of the controller 2.
  • nodes may be added by virtue of redundant or spare electrodes and/or other components having been put in place in the geographical area covered by the system, and then activated under control of the controller as required.
  • the geographical extent of a system can be changed by adding or removing nodes in any of the above described ways.
  • the system may comprise just a first node comprising a transmitter electrode but no receiver electrode plus just a second node comprising a receiver electrode but no transmitter electrode.
  • a simple system 101 may be provided as shown in Figure 3, where the same reference numerals are used for the same components as used in Figure 1.
  • the simple system 101 comprises controller 2 with communication module 4, the transmission elements of the first node 10 (comprising communications module 12, timing module 13, signal generator module 14 and transmitter electrode 17) and the reception elements of the second node 20 (comprising communications module 22, timing module 23, signal generator module 24, current measuring module 26 and receiver electrode 28).
  • the system 101 senses only the previously described electric field 42.
  • radio links according to the Bluetooth protocol are employed to provide communications links between the controller and the communications modules of respective nodes.
  • any other suitable radio protocols may be used, for example Zigbee.
  • a wireless internet arrangement may be used.
  • other wireless possibilities may also be used, for example infra-red or microwave communication.
  • wireless protocols have some latency, they are nevertheless usable as their latency is compatible with the frequencies typically employed for cross-capacitance sensing, e.g. in the above embodiments 100 kHz.
  • the electric fields (e.g. electric fields 41-45) being used for the cross-capacitance sensing may themselves be modulated and demodulated to provide the communication between the controller and the communications modules.
  • the timing (phase) of the alternating voltage 18 can be adjusted in the timing module 23 of the receiving electrode to provide a maximal signal at the direct output connection 134. This adjustment corresponds to a substantially optimal timing alignment.
  • hard-wired links may be provided for communication between the controller and one or more of the communications modules, and any suitable communications protocol may be employed.
  • any suitable communications protocol may be employed.
  • Such an arrangement will be less flexible and easy to install compared to using wireless links, nevertheless some of the advantages of the present modular multi-nodal system over the prior art will still be achieved.
  • the present invention allows new and/or improved applications of cross-capacitance object sensing to be implemented.
  • the present invention allows a transmitter electrode and a receiver electrode of any sensing pair of electrodes to be placed on different appliances or items, e.g. a television, a remote control, within, say, a room covered by a particular sensing system.
  • the controller can be programmed to combine the measurements from multiple transmitter/receiver pairs, and optionally from knowledge of the spatial location of those pairs, to determine information about the location, orientation, size and shape of one or more objects. This information can be interpreted for user interface purposes when one of the objects being sensed is part of a user's body, for example.
  • the 3D range of a transmitter/receiver signal scales with electrode separation; one way to visualise this is to image the receiver and transmitter as located on opposite poles of a sphere.
  • the signal is sensitive to objects inside the sphere and less, or not at all, to objects outside it.
  • the size of the sphere is determined by the separation between the transmitter and receiver.
  • the separation between the electrodes will at most the size of the appliance itself and the range of touchless interaction will be no more than that size.
  • only one of the transmitter electrode or the receiver electrode of a transmitter/receiver electrode pair need be placed in the appliance itself, thus greatly increasing the range over which touchless interaction can be sensed.
  • transmitters and receivers have been considered to be located on the same appliance, typically a display.
  • the spatial distribution of transmitters and receivers is known and fixed.
  • transmitters and receivers may be placed on different appliances, called nodes, and by provision of a means for communication between the nodes (and optionally knowledge of the location in 3D space of the nodes), thus effectively providing a 3D sensitivity space that is much larger than the individual appliances themselves.
  • nodes the appliances, called nodes, and by provision of a means for communication between the nodes (and optionally knowledge of the location in 3D space of the nodes), thus effectively providing a 3D sensitivity space that is much larger than the individual appliances themselves.
  • the controller and other components will be programmed and/or arranged appropriately by the skilled person using conventional means.
  • some possible applications are as follows:
  • Lighting can be adjusted depending on where someone is, where he is heading, looking or pointing.
  • Recognition & Customisation Recognising family members or individuals of other groups (gyms, office) by their gait, and stature. Allowing the customisation of environments and commands.
  • TV remote control Simple gestures made in the space between the TV, remote control and possibly other appliances can be used to advance channels, volume control, or picture zoom.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Near-Field Transmission Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un système de détection d'objet à capacité croisée (1) comprenant une unité de commande (2) et une pluralité de noeuds (10, 20, 30) présentant individuellement une électrode d'émetteur (17, 27, 37) et/ou une électrode de récepteur (18, 28, 38). L'unité de commande (2) communique des informations de synchronisation aux noeuds (10, 20, 30) de manière que des sources de tension alternative respectives (14, 24, 34) des différents noeuds (10, 20, 30) soient synchronisées les unes avec les autres. Un champ électrique (42) prévu entre une électrode d'émetteur (17) d'un premier noeud (10) et une électrode de récepteur (28) d'un second noeud (par exemple, 20) est mesuré, par exemple, une variation dans le courant de capacité croisée produit au niveau de l'électrode de récepteur (28) du second noeud (20) est mesurée, au moyen d'une tension alternative fournie par le second noeud (20) et synchronisée avec la tension alternative du premier noeud (10) mais sans que la tension alternative utilisée dans le premier noeud (10) soit alimentée directement dans l'agencement de mesure du courant de capacité croisée (26) utilisé pour mesurer le courant dans l'électrode de récepteur (28) du second noeud (20). La communication des informations de synchronisation peut être effectuée par liaisons sans fil (11, 21, 31 ).
PCT/IB2006/052505 2005-07-28 2006-07-21 Systeme de detection d'objet WO2007013011A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05106984 2005-07-28
EP05106984.7 2005-07-28

Publications (1)

Publication Number Publication Date
WO2007013011A1 true WO2007013011A1 (fr) 2007-02-01

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TW (1) TW200718920A (fr)
WO (1) WO2007013011A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8057288B2 (en) 2008-06-20 2011-11-15 Nissan North America, Inc. Contact-free vehicle air vent

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5773971A (en) * 1996-08-08 1998-06-30 Zircon Corporation Three electrode AC detection
US20020097059A1 (en) * 1996-02-14 2002-07-25 Stmicroelectronics, Inc. Capacitive distance sensor
US20030021078A1 (en) * 2001-07-25 2003-01-30 Koninklijke Philips Electronics N.V. Object sensing
WO2004099964A2 (fr) * 2003-05-07 2004-11-18 Koninklijke Philips Electronics N.V. Detection d'objets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020097059A1 (en) * 1996-02-14 2002-07-25 Stmicroelectronics, Inc. Capacitive distance sensor
US5773971A (en) * 1996-08-08 1998-06-30 Zircon Corporation Three electrode AC detection
US20030021078A1 (en) * 2001-07-25 2003-01-30 Koninklijke Philips Electronics N.V. Object sensing
WO2004099964A2 (fr) * 2003-05-07 2004-11-18 Koninklijke Philips Electronics N.V. Detection d'objets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8057288B2 (en) 2008-06-20 2011-11-15 Nissan North America, Inc. Contact-free vehicle air vent

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