CN2590305Y - Multifunctional image intensifier bright light automatic protecting apparatus - Google Patents
Multifunctional image intensifier bright light automatic protecting apparatus Download PDFInfo
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- CN2590305Y CN2590305Y CN02257963U CN02257963U CN2590305Y CN 2590305 Y CN2590305 Y CN 2590305Y CN 02257963 U CN02257963 U CN 02257963U CN 02257963 U CN02257963 U CN 02257963U CN 2590305 Y CN2590305 Y CN 2590305Y
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Abstract
The utility model relates to a multifunctional image intensifier bright light automatic protecting apparatus, which comprises a light detector, a light control power supply and a switch adjusting board. An outer shell of the light detector is fixed on a low-light level night vision device, a light shaft is parallel to a light shaft in a night vision device optical system, and output terminals are respectively connected with an input end of a light control power supply board through signal lines. Input terminals of the light control power supply board are respectively connected with an output end of a system direct current power supply and the ground, the output terminals are connected with an input end of the image intensifier and the ground, and signal output terminal rows are respectively connected with corresponding terminals on the switch adjusting board. The utility model is suitable for weak light image intensifiers of different generations, and can provide a stable and reliable direct current working voltage for the weak light image intensifiers by making use of the system power supply. The voltage can be adjusted according to concrete technical standards of the image intensifiers to thoroughly prevent the bright light from damaging a fluoroscopic screen and a photoelectric cathode. A threshold value of the bright light protection can be set according to actual conditions.
Description
One, affiliated technical field
The utility model relate to a kind of exportable direct voltage, be adapted to each multi-functional image intensifier high light automatic safety device for image intensifier.
Two, background technology
Intense flash all can cause damage to the phosphor screen and the photocathode of image intensifier.On the one hand, the image intensifier phosphor screen can only bear the most about 10～200W/mm
2The electronic beam current power density, and when intense flash enters system on the battlefield, the electronic beam current power density that produces on the screen is but much larger than this value, thereby causes fluoroscopic temperature sharply to raise and burnt.On the other hand, high light is mapped on the photocathode, can make photocathode send too much photoelectron in the short time and produce tired even nonvolatil destruction at the utmost point.
For the problems referred to above, the image intensifier in different generations has adopted different solutions, but all also has certain problem.In the first generation image intensifier, employing be defocusness method and voltage drop method.Defocusness method is a serial connection 100M Ω protective resistance between photocathode and negative electrode inner core; photoelectric current reaches 5 to 10 microamperes when intense flash; pressure drop on the protective resistance reaches 2 to 4 kilovolts; thereby make near the electric field significant change of photocathode and temporarily destroyed the focal imaging characteristic; make the imaging area when electron beam arrives phosphor screen enlarge; the beam power density that phosphor screen bore reduces, thereby has protected phosphor screen not burnt.The step-down rule is to be connected in series a high resistance measurement R between the positive output end of phosphor screen and high voltage source, when the photoelectric current of image intensifier increases with the increase of incident illumination, pressure drop on the resistance R will be risen thereupon, and the operating voltage of supplying with image intensifier is descended thereupon.Suitably select the value of resistance R, can make under the high light effect ohmically pressure drop enough big, thereby the electronic beam current power density of beating on phosphor screen is descended and play the fluoroscopic effect of protection.Simultaneously, because the rapid decline of image intensifier operating voltage, the photocathode electrons emitted can not normally be quickened, but forms a negative charge region near resting on photocathode, thereby has stopped the continuation emission of electronics, has played the effect of protection photocathode.In the second generation image intensifier, because the MCP electron multiplier has the effect of high electron stream automatic protection, when the making alive of MCP two ends, only provide limited output saturation current, the phosphor screen of image intensifier can not be subjected to permanent damage yet when strong illumination.
The problem that above-mentioned the whole bag of tricks exists is as follows: in the generation image intensifier, defocusness method can only be protected phosphor screen, and photocathode is not then had protective effect; Though voltage drop method can both play a protective role to phosphor screen and photocathode, it is undertaken by negative feedback, can't prevent high light beginning in a flash to the damage of image intensifier.In the two generation image intensifiers, the high electron stream automatic protection effect of microchannel plate electron multiplier has protective effect to the phosphor screen of image intensifier, but can not directly play due protective effect to photocathode.
Three, summary of the invention
The purpose of this utility model is to provide a kind of and is common to each for image intensifier; can effectively prevent high light to photocathode and fluoroscopic damage, the multi-functional image intensifier high light automatic safety device of stable and direct-current working volts that can regulate according to actual needs can be provided to image intensifier simultaneously.
The technical scheme that realizes the utility model purpose is: a kind of multi-functional image intensifier high light automatic safety device, hardware circuit comprises: photo-detector, light-operated power supply, switch adjustment, its annexation is: the photo-detector shell is fixed on the low-light level night vision device, its optical axis parallels with the optical axis of night vision device optical system, and its lead-out terminal C, B, E link to each other with C, B, the E input of light-operated power panel respectively by holding wire; Light-operated power panel+the 12V input terminal is to (+12V, GND) link to each other with the output and the ground of system DC power supply respectively, input and the ground of its lead-out terminal to connecing image intensifier respectively, its signal output terminal row (GND ,+12V, CZ, CO, AK, CL AO) is connected with the corresponding terminal that switch is adjusted on the plate respectively.
Operation principle of the present utility model is: photo-detector is converted to the signal of telecommunication with the light signal of night vision device optical axis direction, send light-operated power panel to handle.When light intensity at the protection threshold level when following, the stable+3V of light-operated power panel output (by the running parameter decision of image intensifier) direct voltage makes the image intensifier operate as normal.In case light intensity surpasses preset threshold ,+3V output is cut off immediately, makes image intensifier take off electricity, thereby has thoroughly protected the photocathode of image intensifier and phosphor screen to be without prejudice.In the time of under extraneous high light is attenuated to the protection threshold value, light-operated power panel+3V output can open again automatically, makes image intensifier be in normal operating conditions.Light-operated power panel can be regulated by the potentiometer RC1 that adjusts plate that opens the light the multiplication factor of light signal, and high light protection threshold level then can be regulated by the potentiometer RC2 that switch is adjusted plate.Under the state of emergency, can turn off highlight protection function, make image intensifier be in normal operating conditions always by the S1 switch that diverter switch is adjusted on the plate.Switch is adjusted the calibrating terminal TEST1 on the plate, and TEST2 can be used for respectively measuring the size of amplifying the back light signal, and the height of high light protection threshold level.Terminal TEST3, TEST4 is ground.
The utility model is compared with existing technologies, and its remarkable advantage is: the gleam image intensifier that 1, is adapted to each generation; 2, can utilize system+12V power supply, for gleam image intensifier provides reliable and stable direct-current working volts, and this voltage can be adjusted according to the concrete technical indicator of image intensifier; 3, can thoroughly prevent the infringement of high light, and the threshold value of high light protection can be set according to actual conditions to phosphor screen and photocathode.
Four, description of drawings
Fig. 1 is the formation block diagram of multi-functional image intensifier high light automatic safety device of the present utility model.
Fig. 2 is the structural representation of photo-detector of the present utility model.。
Fig. 3 is the circuit theory diagrams of multi-functional image intensifier high light automatic safety device of the present utility model.
Five, embodiment
Describe the details that the concrete device that the utility model proposes is used in detail below in conjunction with accompanying drawing in low-light level night vision device.
According to Fig. 1, the power supply of the multi-functional image intensifier high light protective device that the utility model proposes come from the low-light video system+the 12V battery pack, its+input of 3V output termination image intensifier.After energising was started working, if photo-detector experiences the protection threshold value that ambient light intensity is lower than setting, this device is promptly exported stable+3V voltage made the image intensifier operate as normal.When environmental light intensity is higher than this threshold value ,+3V output is cut off immediately, thereby image intensifier is quit work, and avoids the infringement of high light.In case light intensity is reduced under the protection threshold value ,+3V output recovers again immediately, and system is operate as normal again.
In conjunction with Fig. 1, Fig. 2, Fig. 3, multi-functional image intensifier high light automatic safety device of the present utility model comprises photo-detector, light-operated power panel, the adjustment plate opens the light.Photo-detector is made of polymethyl methacrylate shell 1, phototriode 2, filling gel 3.Phototriode employing 3DUOC and positioning sleeve are glued together.The C of phototriode, B, three utmost points of E are drawn by the holding wire of different colours, and these leads must have outer shielding layer.The effect of photo-detector is: by the light intensity and the variation thereof of phototriode 3DUOC induction system optical axis direction, and be converted into the signal of telecommunication and send into light-operated power panel and handle.The DC-DC converter MAX1659 that light-operated power panel is controlled by operational amplifier LM358 and belt switch etc. forms.Its course of work is: first order amplifier (IC1A) reception of LM358 and amplification are from the signal of telecommunication of photo-detector, and its multiplication factor can be adjusted by the potentiometer RC1 that switch is adjusted on the plate.The signal of the second level amplifier (IC1B) of LM358 after with above-mentioned amplification made comparisons with the protection threshold level of setting by RC2 (being positioned on the switch control board), and its output result receives control end/SHDN that the IC2 that gets back to light-operated power panel is MAX1659 by the toggle switch S1 on the switch adjustment plate.When this end was low level, the OUT of IC2 was output as 0V; During for high level, the OUT of IC2 is output as+3.3V.Should+3.3V voltage can adjust by potentiometer RC3.Switch adjust plate by toggle switch SW, gain potentiometer (RC1), high light protection threshold potential device (RC2) and light signal after amplifying and high light protection threshold level calibrating terminal TS1-4 etc. form.
Photo-detector should be installed on the direction parallel with the night vision device primary optical axis.Its lead-out terminal b, e, c should be connected with the respective terminal of light-operated power panel by shielding conductor.The placement that switch is adjusted plate must guarantee can regulate corresponding switch and potentiometer easily in production and the use.The respective signal that light-operated power panel and switch are adjusted between the plate must firmly connect through flat cable.
From the output of light-operated power panel+the 3V direct voltage, could be connected together with direct-flow input end of gleam image intensifier after must adjusting through test.Concrete adjustment method is: (1) with light-operated power panel+3V lead-out terminal and ground connects the red-black test pencil of universal instrument respectively; (2) the toggle switch SW that switch is adjusted on the plate beats at non-light-operated state, adjusts the potentiometer RC1 of light-operated power panel, makes output voltage be+3V (or other, by the decision of the direct-current working volts parameter of concrete gleam image intensifier).After this voltage is adjusted, must the potentiometer RC1 glue on the light-operated power panel be sealed, in case cause departing from of voltage owing to vibrations wait.Turn off power supply then, with light-operated power panel+3V output and ground and the corresponding terminal of image intensifier connect.After all lines connect; must be under the condition of pinhole imaging system, the light amplification multiple that comes adjusting device of RC1 and the RC2 potentiometer by light-operated power panel and high light protection threshold level (noticing that the toggle switch SW that this moment, switch was adjusted plate should beat at light-operated state) respectively.After mixing up, device gets final product operate as normal.
For infrared viewing device, the phototriode in the photo-detector can be replaced by the infrared type photosensitive tube and can realize all functions.
Claims (3)
1, a kind of multi-functional image intensifier high light automatic safety device, it is characterized in that: hardware circuit comprises photo-detector, light-operated power supply, switch adjustment, its annexation is: the photo-detector shell is fixed on the low-light level night vision device, its optical axis parallels with the optical axis of night vision device optical system, and its lead-out terminal C, B, E link to each other with C, B, the E input of light-operated power panel respectively by holding wire; The input terminal of light-operated power panel is to linking to each other input and the ground of its lead-out terminal to connecing image intensifier respectively, its signal output terminal row (GND respectively with the output and the ground of system DC power supply, + 12V, CZ, CO, AK, CL AO) is connected with the corresponding terminal that switch is adjusted on the plate respectively.
2, multi-functional image intensifier high light automatic safety device according to claim 1; it is characterized in that: light-operated power panel+the 12V input terminal is to (+12V; GND) link to each other with the output and the ground of system+12V DC power supply respectively; its+the 3V lead-out terminal to (+3V, GND) connect respectively image intensifier+3V input and ground.
3, multi-functional image intensifier high light automatic safety device according to claim 1 and 2 is characterized in that: photo-detector is made of polymethyl methacrylate shell [1], phototriode [2], filling gel [3].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02257963U CN2590305Y (en) | 2002-10-24 | 2002-10-24 | Multifunctional image intensifier bright light automatic protecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02257963U CN2590305Y (en) | 2002-10-24 | 2002-10-24 | Multifunctional image intensifier bright light automatic protecting apparatus |
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| Publication Number | Publication Date |
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| CN2590305Y true CN2590305Y (en) | 2003-12-03 |
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| CN02257963U Expired - Fee Related CN2590305Y (en) | 2002-10-24 | 2002-10-24 | Multifunctional image intensifier bright light automatic protecting apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100431085C (en) * | 2006-09-11 | 2008-11-05 | 中国兵器工业第二○五研究所 | Third generation gleam image intensifier distinguishability adjusting device and method |
| CN102789026A (en) * | 2011-05-18 | 2012-11-21 | 亚洲光学股份有限公司 | Optical monitoring module |
| CN104713550A (en) * | 2015-03-12 | 2015-06-17 | 北京航空航天大学 | Methods and device for protecting high-dynamic star sensor from high light |
| CN106711940A (en) * | 2016-12-16 | 2017-05-24 | 山东北方光学电子有限公司 | Protection circuit used for low-light level night vision device |
| CN109757020A (en) * | 2019-03-12 | 2019-05-14 | 江苏北方湖光光电有限公司 | A kind of control circuit based on low-light protection |
-
2002
- 2002-10-24 CN CN02257963U patent/CN2590305Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100431085C (en) * | 2006-09-11 | 2008-11-05 | 中国兵器工业第二○五研究所 | Third generation gleam image intensifier distinguishability adjusting device and method |
| CN102789026A (en) * | 2011-05-18 | 2012-11-21 | 亚洲光学股份有限公司 | Optical monitoring module |
| CN104713550A (en) * | 2015-03-12 | 2015-06-17 | 北京航空航天大学 | Methods and device for protecting high-dynamic star sensor from high light |
| CN104713550B (en) * | 2015-03-12 | 2016-04-27 | 北京航空航天大学 | A kind of method and apparatus of high dynamic star sensor high light protection |
| CN106711940A (en) * | 2016-12-16 | 2017-05-24 | 山东北方光学电子有限公司 | Protection circuit used for low-light level night vision device |
| CN106711940B (en) * | 2016-12-16 | 2018-12-21 | 山东北方光学电子有限公司 | Protection circuit for low-light level night vision device |
| CN109757020A (en) * | 2019-03-12 | 2019-05-14 | 江苏北方湖光光电有限公司 | A kind of control circuit based on low-light protection |
| CN109757020B (en) * | 2019-03-12 | 2023-08-15 | 江苏北方湖光光电有限公司 | Control circuit based on shimmer protection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |