CN101634792A - Device and method for mechanically controlling exposure time - Google Patents
Device and method for mechanically controlling exposure time Download PDFInfo
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- CN101634792A CN101634792A CN200810117245A CN200810117245A CN101634792A CN 101634792 A CN101634792 A CN 101634792A CN 200810117245 A CN200810117245 A CN 200810117245A CN 200810117245 A CN200810117245 A CN 200810117245A CN 101634792 A CN101634792 A CN 101634792A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 241000237509 Patinopecten sp. Species 0.000 claims description 24
- 235000020637 scallop Nutrition 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 12
- 239000004411 aluminium Substances 0.000 description 11
- 238000004891 communication Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
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- 230000011664 signaling Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
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- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
本发明提供一种曝光时间机械控制装置，包括具有扇形孔的盘状快门、控制所述盘状快门转动的直流无刷电机和控制所述直流无刷电机转速的控制电路，所述控制电路用于根据当前所需的曝光时间和盘状快门的当前位置计算出所述直流无刷电机的转速，并控制所述直流无刷电机以该转速工作。本发明同时提供了相应的曝光时间控制方法。本发明采用了速度调制和大孔驻留的方式实现曝光时间，可以实现27个曝光时间，最小精确曝光时间可达2ms，最大可向上无限延伸，动态范围大，一致性、均匀性和可靠性好，精度高，航天和地面系统均可应用。
The invention provides a mechanical control device for exposure time, which includes a disc shutter with a fan-shaped hole, a DC brushless motor for controlling the rotation of the disc shutter, and a control circuit for controlling the rotation speed of the DC brushless motor. Calculate the rotation speed of the DC brushless motor according to the current required exposure time and the current position of the disc shutter, and control the DC brushless motor to work at the rotation speed. The invention also provides a corresponding exposure time control method. The present invention realizes the exposure time by means of speed modulation and large hole dwelling, can realize 27 exposure times, the minimum accurate exposure time can reach 2ms, the maximum can be infinitely extended upwards, the dynamic range is large, consistency, uniformity and reliability Good, high precision, both aerospace and ground systems can be applied.
Description
Technical field
The invention belongs to the space astronomical observation technical field, specifically, the present invention relates to a kind of time shutter control device and control method thereof of imaging observation instrument.
Background technology
The time shutter control device is astronomical sight critical component in the Image-forming instrument.For some Image-forming instrument,, need the time shutter control device to realize greater than 10 as the Image-forming instrument of solar X-ray wave band
4The dynamic range of magnitude is so that the sun picture rich in detail under the acquisition different condition.The time shutter control device that use in the space need satisfy space motion requirements such as anti-irradiation, high uniformity, long-life, high reliability, so general time shutter control device commonly used can't satisfy request for utilization.Brshless DC motor have rotating speed evenly, turn to plurality of advantages such as fast, that the life-span is long, station-keeping ability is better, realize that with it time shutter is controlled at acquisition in the world and uses more widely, sun shortwave Image-forming instruments such as SXT/YOHKOH, XRT/SOLAR-B, EIT/SOHO for example, sector disk in these instruments has the scallop hole of 2-3 different angles, short exposure time is by rotating little scallop hole by light path, and the long time shutter adopts resident mode to realize by controlling big scallop hole.For a long time, when realizing short exposure time, the control motor adopts fixing rated speed, by turning over the light path number of times decision time shutter back and forth.For the shutter of sector disk, come back rotation to be meant that exposure hole passes through exposure region with rotating counterclockwise clockwise with identical speed repeatedly.The shortcoming of this control mode is that efficient is low, and dutycycle is big, and introduces the invalid time shutter to system, therefore has many drawbacks.And the low side time shutter (being minimum exposure time) that this time shutter control device is realized, for example the low side time shutter of TRACE was 44ms more than 10ms.And SXT/YOHKOH has adopted the mode of introducing the aperture plate of different transmitances on light path, makes the low side time shutter reach below the 10ms.But compare with the mode of control motor, adopt the attainable low side time shutter point of mode of aperture plate less relatively, control realizes going up the aperture plate that the different low side time shutter need introduce different transmitances, and is also convenient relatively not as the speed control of motor.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can realize wide dynamic range and high-precision time shutter machine control unit of high-level efficiency and control method thereof.
For achieving the above object, time shutter machine control unit provided by the invention, comprise motor that shutter, the described shutter of control rotate and the control circuit of controlling described motor speed, described control circuit is used for according to current required time shutter and described shutter current location, calculates described rotating speed of motor and controls described motor and finish exposure with this rotary speed working.
In the technique scheme, described shutter is finished exposure with the mode or the resident mode of a simple scanning.
In the technique scheme, described shutter is the plate-like shutter with scallop hole.
In the technique scheme, described motor is a dc brushless motor.
In the technique scheme, described control circuit comprises: computing unit, signal acquisition module and emergency protection module; Described signal acquisition module is connected with described motor, is used to gather the rotating speed and the position of described plate-like shutter; Described computing unit is connected with described signal acquisition module, is used for the current location according to required time shutter and plate-like shutter, calculates the rotating speed of described dc brushless motor.
In the technique scheme, described control circuit also comprises: input/output module and communication module.
In the technique scheme, described plate-like shutter has two scallop holes at least, comprises little scallop hole and big scallop hole; Described little scallop hole is that 2-5 degree, described big scallop hole are the 20-30 degree.
In the technique scheme, described shutter is the aluminum shutter.
For achieving the above object, time shutter mechanical control method provided by the invention comprises the steps:
1) control circuit calculates the required rotating speed of dc brushless motor according to the angle of required time shutter and shutter exposure region;
2) dc brushless motor drives the unidirectional rotation of shutter with the rotating speed that calculates in the step 1) and finishes exposure.
In the technique scheme, the described plate-like shutter of described time shutter machine control unit has two scallop holes at least, comprises little scallop hole and big scallop hole; Described little scallop hole is that 2-5 degree, described big scallop hole are the 20-30 degree;
Before carrying out described step 1), at first select scallop hole according to the time shutter, when the time shutter surpasses the threshold value that sets, use big scallop hole to expose; When the time shutter does not surpass the threshold value that sets, use little scallop hole to expose.
In the technique scheme, when the time shutter is in 1-20ms, use little scallop hole to adopt the mode of a simple scanning to finish exposure; When the time shutter is in 20-470ms, use big scallop hole to adopt the mode of a simple scanning to finish exposure.
In the technique scheme, when the time shutter surpasses 470ms, use in the big resident mode of scallop hole and expose; Described step 1) also comprises: control circuit calculates the required residence time of dc brushless motor according to required time shutter and scallop hole angle.
The useful technique effect that the present invention has comprises:
The present invention has adopted velocity modulation and the resident mode of macropore to realize the time shutter, the different aluminium disc spin speed of following employing of certain time shutter realizes different exposure time, then adopts the mode of the resident different time of macropore to realize different exposure time beyond certain time shutter.
This device can be realized 27 time shutter, and the minimum accurately time shutter can reach 2ms, and maximum can make progress and infinitely extend, and dynamic range is big, consistance, homogeneity and good reliability, and the precision height, space flight and ground system all can be used.
Description of drawings
Below, describe embodiments of the invention in conjunction with the accompanying drawings in detail, wherein:
Fig. 1 is an exposure-control device system hardware block diagram;
Fig. 2 is an exposure-control device aluminium dish synoptic diagram.
Embodiment
The present invention conceives substantially by position control and speed regulating control and reaches wide dynamic range.
Aluminium dish synoptic diagram such as accompanying drawing 2 are controlled in the telescopical exposure of SXIT, and black circle represents to be sitting at the light source on the shutter 20 degree unthreaded hole center lines among the figure, can think that this light source is static from engineering viewpoint.Have two scallop holes that vary in size on the shutter, the number of degrees of perforate can be formulated according to actual needs, and as aperture 2-5 degree, macropore 20-30 degree etc., the shutter perforate number of degrees are 3 degree and 20 degree in the present embodiment, and all the other are the shadow zone.Now the perforate with 3 degree and 20 degree is an example, how to realize the control of different exposure time from this device of control mode explanation.Make 3 degree, 20 degree for Wei not S, the L hole.Regulation Z axle is vertical with the center line of S, the perforate of L hole in the accompanying drawing 2, is the center line of desirable scrambler z signal optocoupler.
The hardware system of present embodiment adopts TMS320F240 to be the control core, according to programmed instruction the control motor is set and drives the aluminium dish in a different manner and rotate, when fan-shaped perforate during by facular area realization to the exposure requirement of CCD (also can be other sensor devices).
Present embodiment control circuit hardware design realizes mainly comprising following functional module: computing unit, input/output module, communication module, signal acquisition module and emergency protection module.
Wherein computing unit comprises CPU control core and utility appliance thereof.Described utility appliance comprises: energy supply control module, state display module, accessory power supply, crystal oscillator and RAM storer.
The emergency protection module is used for protection control motor and control circuit; the signal that collection monitors according to signal acquisition module; when system power voltage is excessive or too small, the automatic termination system work of described emergency protection module meeting, and bright pilot lamp is reported to the police in state shows.Signal acquisition module comprises signal condition, input among the figure, revolve and become interface and four parts of rotary encoder, and position signalling detects rotor-position and the speed that rotary encoder shown in the employing figure detects motor.Scrambler becomes interface and related circuit is passed CPU control core back with the voltage location signal of detected motor through overwinding, is calculated spinner velocity according to detected location status and is sent instruction and do corresponding processing by the control core.This device adopts the RDCAD2S90 of AD company to cooperate the oscillator AD2S99 of AD company oneself to use, and its highest detection is changeed scooter 30000rpm, no matter is from quickening the harsh requirement that precision or stable state accuracy all can guarantee system.The effect of input is at any time direct current in the circuit and AC current-voltage signal to be detected and monitor, and the effect of signal condition is that current/voltage and the position signalling that detects carried out processing such as shaping, again the signal after the conditioning is sent to the control core.
In the present embodiment, described input/output module and communication module are mainly used (not indicating in the drawings) when debugging.In debug process, computing machine sends the order of shutter exposing operation, and successively arrives the control core by load module and communication module, and rreturn value and running status that the control core will be carried out after the exposure transfer to computing machine through communication module and output module again.Debug process can be tried the different time shutter out, thereby reaches the purpose that repeatedly detects exposure accuracy and exposure accuracy stability repeatedly and constantly improve and optimizate.
Present embodiment can at first be determined the threshold value of time shutter, will be divided into short exposure time, medium time shutter and long time shutter the time shutter.Short exposure time and medium time shutter use the mode of a simple scanning to finish exposure, and wherein short exposure time is used the aperture exposure, and the medium time shutter is used the macropore exposure; The long time shutter uses resident mode to finish exposure.Described threshold value is to determine according to the velocity range that the size of scallop hole and motor can be realized.Provide an instantiation below.
One, the realization of following time shutter of 470ms
Implementation procedure with time shutter of 1ms is an example, realize the exposure of 1ms, mainly contains following step:
1, after electrification reset and power monitoring module are finished power on initial reset and self check to cpu system among Fig. 1, when aluminium dish labeled slots overlap with the Z axle, hot spot is arranged in Fig. 2 shadow zone 1, photoelectric code disk (rotary transformer) produces the z signal with Protection Counter Functions, signal acquisition module collects this signal and it is transferred to master chip, system control cpu thinks that the position of this moment motor and aluminium dish is zero, and the anglec of rotation and the position that begin to calculate the aluminium dish from this moment.
2, CPU control core process is calculated, the parameters such as rotating speed that accomplished 1ms exposure motor needs, and send the motion of instruction control driven by motor aluminium dish.Motor receives that programmed instruction drives the aluminium dish with certain speed and turns over 90 degree clockwise, and speed is 500rpm when guaranteeing light source through the S hole, produces the exposure of 1ms this moment.
3, the hot spot position rear motor that falls into aluminium dish shadow zone 2 stops operating, and the synchronous signal acquisition module sends exposure and finishes and instruct back system control cpu, and the motor waiting for CPU is sent next instruction, the most important thing is to guarantee rotating speed in the whole process.
If next instruction is 1ms still, then step is same as described above, and just sense of rotation is counterclockwise, is parked in the zero degree position at last and awaits orders.Time shutter uses during for 1-20ms 3 degree perforates by light source, and 20-470ms uses 20 degree holes.All adopt the simple scanning mode one time, speed adjustable range is from 30.30rpm-500rpm..
Two, the realization of above time shutter of 470ms
Its execution in step and above-mentioned basic identical, different is to stop preset time at tapping.Motor is according to instruction, 1 or 2 standby position starts from the shadow zone, by control to position and speed, be parked in certain angle, just make light source drop on the centerline in L hole, after reaching the expection residence time, motor restarts, and the standby position that rotating disk enters shadow zone 2 or 1 stops and finishes exposure.Perforate is what be calculated as of the residence time of light source:
Residence time=given time shutter-from entering L hole time to the time of stopping-time of producing once more
The present invention has adopted velocity modulation and the resident mode of macropore to realize the time shutter, the different aluminium disc spin speed of following employing of certain time shutter realizes different exposure time, then adopts the mode of the resident different time of macropore to realize different exposure time beyond certain time shutter.
This device can be realized 27 time shutter, and the minimum accurately time shutter can reach 2ms, and maximum can make progress and infinitely extend, and dynamic range is big, consistance, homogeneity and good reliability, and the precision height, space flight and ground system all can be used.
The time shutter control device of present embodiment is a kind of wide dynamic range time shutter control device of high precision high evenness, its time shutter can be between 1ms to 10s dynamic adjustments, this device mainly satisfies the application demand of the domestic sun X-EUV imaging telescope of developing.
The time shutter control device 1 that present embodiment provides) based on the speed governing control strategy of realization time shutter, increased the efficient in orbit of system, avoided invalid exposure; 2) adopted the vector controlled motor method of position sensor (as rotary encoder) and realize making control system simple by control device as the scheme of control core, and the exposure dynamic range that realizes is big with DSP.
Above-described specific embodiment has been described in detail purpose of the present invention, technical scheme and beneficial effect.Institute's foregoing that it should be understood that is not limited to the present invention only for specific embodiments of the invention.All within spirit of the present invention and principle, any modification of being made, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810117245A CN101634792A (en) | 2008-07-25 | 2008-07-25 | Device and method for mechanically controlling exposure time |
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| CN200810117245A CN101634792A (en) | 2008-07-25 | 2008-07-25 | Device and method for mechanically controlling exposure time |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605251A (en) * | 2013-11-07 | 2014-02-26 | 中国科学院紫金山天文台 | Large-aperture rolling shutter of astronomical telescope CCD camera |
| CN107390574A (en) * | 2017-07-06 | 2017-11-24 | 浙江工业大学 | A kind of controllable mechanical shutter light-baffling device |
| CN109581782A (en) * | 2019-01-22 | 2019-04-05 | 长光卫星技术有限公司 | A kind of highly reliable center type mechanical shutter of Asia Millisecond |
| CN110337260A (en) * | 2017-03-30 | 2019-10-15 | Hoya株式会社 | Electronic endoscope apparatus |
-
2008
- 2008-07-25 CN CN200810117245A patent/CN101634792A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605251A (en) * | 2013-11-07 | 2014-02-26 | 中国科学院紫金山天文台 | Large-aperture rolling shutter of astronomical telescope CCD camera |
| CN103605251B (en) * | 2013-11-07 | 2016-06-08 | 中国科学院紫金山天文台 | The heavy caliber belt-type shutter of astronomical telescope CCD camera |
| CN110337260A (en) * | 2017-03-30 | 2019-10-15 | Hoya株式会社 | Electronic endoscope apparatus |
| CN110337260B (en) * | 2017-03-30 | 2022-03-25 | Hoya株式会社 | Electronic endoscope device |
| CN107390574A (en) * | 2017-07-06 | 2017-11-24 | 浙江工业大学 | A kind of controllable mechanical shutter light-baffling device |
| CN107390574B (en) * | 2017-07-06 | 2020-09-01 | 浙江工业大学 | A controllable mechanical shutter light blocking device |
| CN109581782A (en) * | 2019-01-22 | 2019-04-05 | 长光卫星技术有限公司 | A kind of highly reliable center type mechanical shutter of Asia Millisecond |
| CN109581782B (en) * | 2019-01-22 | 2020-12-25 | 长光卫星技术有限公司 | Sub-millisecond-level high-reliability central mechanical shutter |
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Open date: 20100127 |