JP3722957B2 - Intrusion detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intruder detection device that detects an intruder, and in particular, radiates energy such as infrared rays to a detection space, passively reflects reflected energy from the detection space, and intruders based on changes in the passive energy. The present invention relates to an intrusion detection device that detects the presence or absence of an alarm.
[0002]
[Prior art]
Conventionally, it is applied to security systems such as buildings and houses, and as a sensor for detecting the intruder's entry into the detection space, infrared light is projected into the detection space, and the intruder is detected by the change in the amount of received infrared light. There is something to detect.
In these conventional detection devices, when there is a person in the room such as in the daytime, the warning release mode is set so that the alarm is not output even if the amount of infrared rays changes due to the reflected light of the person.
[0003]
[Problems to be solved by the invention]
However, if a mat is installed on the floor of the detection space or if wax is applied in this warning release mode, the amount of infrared reflection on the floor changes, and the amount of infrared received by the sensor is the same as before the wax is applied. It will change later. In such a case, when set to a warning mode that generates an alarm when an intruder is detected, such as at night, the criterion value for determining the presence or absence of an intruder remains unchanged before waxing. The amount of infrared light received by the sensor from the floor or the like changes, so that the amount of received light exceeds the determination reference value and there is no intruder, which is a so-called false alarm that outputs an alarm.
[0004]
In addition, there is a proposal that automatically updates the amount of light received as a judgment criterion when entering set mode, but for example, a cover that prevents malicious third parties from transmitting infrared light to the sensor during warning cancellation When the advertisement is hung or the advertisement is hung in the immediate vicinity of the sensor, the infrared reference amount is updated in that state, which may cause a blind spot in the sensor.
[0005]
In view of the above-mentioned problems, the present invention identifies an act that does not hinder the detection of the sensor, such as a mat placed on the floor, and an action that hinders the detection of the sensor, thereby stabilizing the intruder detection. It aims to provide an intrusion detection device that can be
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an intrusion detection device according to the present invention comprises, as described in claim 1, radiation means for radiating energy to a detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
When the passive amount of the passive means falls outside a predetermined range of the reference passive amount, the determination means determines that the passive amount is a new reference if the change in the distance between the reflecting objects by the distance measuring means is less than or equal to the predetermined range. It is characterized in that it is stored in the reference value storage means as a passive quantity.
[0007]
Further, as described in claim 2, radiating means for radiating energy to the detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
When the passive amount of the passive means is out of the predetermined range of the reference passive amount and the passive amount is stable for a predetermined time or more after the determination means, the change in the distance between the reflecting objects by the distance measuring means is within the predetermined range. If it is within the range, the passive amount may be stored in the reference value storage means as a new reference passive amount.
[0008]
Further, as described in claim 3, radiation means for radiating energy to the detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
The determination means outputs an abnormal signal when the passive amount of the passive means is out of a predetermined range of the reference passive amount, and the passive amount is not stable for a predetermined time, and the passive amount is stabilized for a predetermined time. In this case, if the change in the distance between the reflecting objects by the distance measuring means is within a predetermined range, the passive amount is stored as a new reference passive amount in the reference value storage means, and the change in the distance is outside the predetermined range. If it exists, it can also be set as the structure which outputs an abnormal signal.
[0009]
According to a fourth aspect of the present invention, the distance measuring means measures the distance to the target object based on the energy radiation timing emitted from the radiation means and the reflected energy passive timing detected by the passive means. It is good.
[0010]
According to a fifth aspect of the present invention, the distance measuring means changes on the passive surface of the passive means corresponding to the distance to the target object with respect to the radiation means and the passive means fixed based on the triangulation. The distance to the target object may be measured based on the passive position of the reflected energy.
[0011]
The energy radiated by the radiating means is reflected by the target object, detected by the passive means, and the passive amount is measured. The distance measuring means measures the distance to the object based on the emission timing of the radiated energy and the timing at which the reflected light is detected.
The determination unit stores the passive amount as a new reference passive amount if the change in the distance between the reflecting objects by the distance measuring unit is less than or equal to a predetermined range when the passive amount is outside the predetermined range of the reference passive amount. It is used for intruder detection during subsequent intrusion alerts.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram showing a first embodiment of an intrusion detection device according to the present invention.
The radiating means 1 includes a light emitting unit 1a such as an LED and an optical system 1b such as a lens, a mirror, and a filter. The passive means 2 includes a light receiving unit 2a such as a PD and an optical system 2b such as the lens.
The light beam of the radiating means 1 is emitted into the alert area, and the reflected light reflected by the object (intruder) is detected by the light receiving unit 2a of the passive means 2. The passive amount detected by the light receiving unit 2 a is amplified by the amplification unit 3 and output to the determination unit 5 via the A / D conversion unit 4.
Here, the light beam emitted from the light emitting unit 1a and the light beam detected by the light receiving unit 2a have a delay time (phase difference) corresponding to the distance to the object. FIG. 2 shows the phase difference between the emitted light beam and the received light beam. The clock pulse oscillated at a predetermined frequency F has a phase difference t corresponding to the distance to the object.
[0013]
The distance measuring means 6 includes an oscillation unit 6a that oscillates and drives the light emitting unit 1a at a predetermined frequency, and a phase detection unit 6b that detects a phase difference between a clock pulse supplied to the light emitting unit 1a and a clock pulse detected by the light receiving unit 2a. And an A / D converter 7 for A / D converting the output of the phase detector 6 b and outputting it to the determination means 5.
[0014]
The determination unit 5 is provided with a CPU, a storage unit such as a RAM and a ROM, and executes a reference passive amount update process based on a processing program stored in the ROM or the like.
The determination means 5 receives the passive amount amplified by the amplifying unit 3 and the phase difference detected by the distance measuring means 6, obtains the distance to the object as described later based on these inputs, and stores the reference value storage means The reference passive quantity stored in 8 is updated. This reference passive amount is data for determination reference for intruder determination, and the passive amount detected by the light receiving unit 2a is stored in the reference passive amount storage means in the RAM as a reference passive amount under a predetermined condition. The update is stored. Similarly, reference distance data serving as a reference among the distances to the object is stored in the distance data storage means 9 in the RAM.
It should be noted that a CPU in which the A / D converters 4 and 7 are built in the CPU of the determination means 5 may be used.
[0015]
Next, the processing content of the reference passive quantity update with the above configuration will be described based on the flowchart of FIG.
The light emitting unit 1a of the radiating unit 1 emits a light beam (SP1), and the reflected light of the object is received by the light receiving unit 2a of the passive unit 2 (SP2).
The determination means 5 compares this passive amount with the stored reference passive amount and detects the difference between the two (SP3). If the difference amount is small and within a predetermined range, it is determined that the reference passive amount is not updated, and the initial return is performed. On the other hand, when the difference amount is large and outside the predetermined range, the distance to the object is calculated (SP4), and this detection signal is output to the signal sending means 10 (SP5).
[0016]
The calculation of the distance to the object in SP4 is obtained by the phase detection unit 6b of the distance measuring means 6, and the phase detection unit 6b includes the light beam emitted from the light emitting unit 1a and the light beam detected by the light receiving unit 2a. Based on the phase difference t, the distance to the object is converted and output.
Here, the phase detection unit 6b converts the detected phase difference t into a distance based on the speed of light and the oscillation frequency of the oscillation unit 6a.
[0017]
The detection signal at SP5 is output to an alarm device (not shown) by the signal transmission means 10. In the alarm device, when a detection signal is input, an alarm signal is sent to an external security center when alerting.
[0018]
Next, the distance to the object calculated in SP4 is compared with the reference distance data stored in the distance data storage means 9, and the difference between the two is detected (SP6). If this difference is small and within a predetermined range, the reference passive amount is updated as it does not interfere with intruder detection such as mat installation on the floor (SP7). On the other hand, when the difference is large and out of the predetermined range, the initial return is made without updating the reference passive amount as a change of the passive amount due to the intruder or the obstacle.
[0019]
After the reference passive amount is updated in SP7, the passive amount is continuously detected after the initial return and the reference passive amount is updated.
In this way, by adopting a configuration in which the passive amount is detected and updated as needed, the reliability of the reference passive amount that is the basis of the intrusion detection determination can be maintained over time, and the intrusion detection accuracy can be maintained. Become.
[0020]
Next, FIG. 4 is a flowchart showing another processing content of the reference passive quantity update. In the figure, the same step number (SP) is attached to the same processing contents as in FIG. 3, and in the processing contents of the same figure, another determination condition SP10 is provided between SP3 and SP4. Yes.
That is, another condition for updating the reference passive quantity is added, and the process can be shifted to SP4 only when the difference between the passive quantity detected at SP3 and the reference passive quantity is stable for a predetermined time. .
[0021]
As a result, if the detected difference in the passive amount is stable for a predetermined time, it can be determined that the object is not a moving object such as an intruder, and can be regarded as a fixed object. Similarly, the update of the reference passive amount is permitted when the change in distance is within a predetermined range.
On the other hand, when the difference between the detected passive amounts is not stable for a predetermined time, the object is regarded as a movement of an intruder or the like, and a detection signal is output.
According to the above configuration, since the update condition of the reference passive amount is made stricter, the reliability of the updated reference passive amount can be further improved.
[0022]
Next, FIG. 5 is a flowchart showing still another processing content of the reference passive quantity update. In the same figure, the same processing number as FIG. 4 is attached with the same step number (SP), and in the processing content of the same figure, when the change of the distance explained in FIG. 4 is outside the predetermined range. The processing (SP6) is distinguished from the transmission of the intruder detection signal (SP5), and the visual field disturbance detection signal indicating the visual field angle disturbance is transmitted (SP11). That is, when the object is not a moving object and there is a possibility that the intrusion detection may be hindered, a visual field disturbance detection signal is transmitted.
[0023]
Next, FIG. 6 is a block diagram showing a second embodiment of the present invention.
In this embodiment, the configuration of the distance measuring means is changed from the configuration of the first embodiment. That is, a PSD (Position Sensitive Detector) is used for the light receiving unit 11a. The PSD has a passive surface 11aa arranged in a one-dimensional array or two-dimensionally.
FIG. 6 is a diagram for explaining the distance measuring operation. As shown in the figure, the PSD is based on the principle of triangulation, and when an object (intruder) moves and the distance to the object changes as indicated by a dotted line in the figure, incident light is reflected on the passive surface 11aa. This distance is detected by moving the position.
[0024]
The light receiving unit 11a made of PSD outputs a signal corresponding to the incident position of light on the passive surface 11aa and a passive amount of incident light.
Based on the position of the incident light on the passive surface 11aa and the passive amount, the determination unit 5 executes each process described in the flowcharts of FIGS. 3 to 5 described above to perform the reference passive amount. Update process.
As described above, even if the configuration of the light receiving unit 11a is changed, the determination unit 5 will be described in the first embodiment if there is an input of a distance signal to an object and a signal of a passive amount of reflected light. It is possible to update the reference passive quantity in the same manner as described above by executing the determination process.
In the above-described embodiments of the present invention, the distance is measured using light. However, the present invention is not limited to this, and the distance may be measured using any means such as an ultrasonic wave or a microwave.
[0025]
【The invention's effect】
According to the present invention, the reference passive amount used for intruder detection is configured to be updated when there is a predetermined change in the passive amount in the detection space. This is a configuration that is updated at least when there is little change in this distance, so there is no obstacle to intrusion detection even if a new object is installed or removed from the detection space. Since it is updated, it becomes possible to cope with environmental changes that change from moment to moment.
For example, when a mat is installed on the floor surface, the passive amount changed by the mat installation is updated and stored as a new reference passive amount on the assumption that there is little change in distance and there is no problem in detection. If an obstacle is installed unexpectedly or deliberately, it will be recognized that this is an action that causes a large change in distance and will hinder the detection of intruders. Is not stored as a new reference passive quantity. As a result, the stored reference passive amount is updated only when appropriate, so that intruder detection at the time of intrusion warning can be accurately performed without error.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of an intrusion detection device of the present invention.
FIG. 2 is a time chart showing a phase difference between a light emitting beam and a light receiving beam.
FIG. 3 is a flowchart showing processing details of reference passive quantity update.
FIG. 4 is a flowchart showing another processing content of the reference passive quantity update.
FIG. 5 is a flowchart showing still another processing content of reference passive quantity update.
FIG. 6 is a configuration diagram showing a second embodiment of the intrusion detection device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radiation means, 1a ... Light emission part, 1b, 2b, 11b ... Optical system, 2 ... Passive means, 2a, 11a ... Light reception part, 3 ... Amplification part, 4, 7 ... A / D conversion part, 5 ... Determination means 6, 11 ... Distance measuring means, 6a ... Oscillator, 8 ... Reference value storage means, 9 ... Distance data storage means, 10 ... Signal transmission means.

Claims (5)

Radiation means for radiating energy into the detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
When the passive amount of the passive means falls outside a predetermined range of the reference passive amount, the determination means determines that the passive amount is a new reference if the change in the distance between the reflecting objects by the distance measuring means is less than or equal to the predetermined range. An intrusion detection apparatus, wherein the intrusion detection apparatus stores the passive amount in the reference value storage means. Radiation means for radiating energy into the detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
When the passive amount of the passive means is out of the predetermined range of the reference passive amount and the passive amount is stable for a predetermined time or more after the determination means, the change in the distance between the reflecting objects by the distance measuring means is within the predetermined range. If it is within, the intrusion detection device stores the passive amount as a new reference passive amount in the reference value storage means. Radiation means for radiating energy into the detection space;
Passive means for passively reflecting reflected energy from a reflecting object in the detection space;
Reference value storage means for storing a reference passive quantity;
In the intrusion detection device having a determination means for determining the intruder intrusion into the detection space based on the passive amount passive by the passive means and the reference passive amount,
Provided with a distance measuring means for measuring the distance to the reflective object,
The determination means outputs an abnormal signal when the passive amount of the passive means is out of a predetermined range of the reference passive amount, and the passive amount is not stable for a predetermined time, and the passive amount is stabilized for a predetermined time. In this case, if the change in the distance between the reflecting objects by the distance measuring means is within a predetermined range, the passive amount is stored as a new reference passive amount in the reference value storage means, and the change in the distance is outside the predetermined range. An intrusion detection device characterized by outputting an abnormal signal if any. 4. The intrusion detection according to claim 3, wherein the distance measuring means is configured to measure a distance to a target object based on an energy radiation timing emitted from the radiation means and a reflected energy passive timing detected by the passive means. apparatus. The distance measuring means is based on a passive position of reflected energy that changes on a passive surface of the passive means corresponding to a distance to the target object with respect to the radiation means and the passive means fixed based on triangulation. The intrusion detection device according to claim 3, which is configured to measure a distance up to.

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