CN101393053B - Partial gating glimmer detector of image intensifier based on generation III proximity type at normal temperature - Google Patents
Partial gating glimmer detector of image intensifier based on generation III proximity type at normal temperature Download PDFInfo
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- CN101393053B CN101393053B CN2008102320028A CN200810232002A CN101393053B CN 101393053 B CN101393053 B CN 101393053B CN 2008102320028 A CN2008102320028 A CN 2008102320028A CN 200810232002 A CN200810232002 A CN 200810232002A CN 101393053 B CN101393053 B CN 101393053B
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Abstract
The invention discloses a low light level detector which is based on a third generation proximity image intensifier and performs local gating at normal temperature. The low light level detector comprises a detector shell, wherein the detector shell is divided into an upper cavity and a lower cavity; a light measurement CCD, a video acquisition module, a field programmable gate array, a liquid crystal driving module, a power supply and a display screen are sequentially arranged in the upper cavity; one end, which is connected with the light measurement CCD, outside the upper cavity is providedwith a lens A; a pushbutton is arranged outside the other end of the upper cavity; a liquid crystal board, a third generation proximity type magnetic mirror array image intensifier, an optical fiber taper and an imaging CCD are sequentially arranged in the lower cavity; one end, which is connected with the liquid crystal board, outside the lower cavity is provided with a lens B; and the lens A andthe lens B are parallelly arranged. The detector automatically performs local gate control on light intensity, has wider dynamic application range, and can normally work and clearly image within thelight intensity range of between 10<-8> and 10<5>lx.
Description
Technical field
The invention belongs to photoelectronic imaging Detection Techniques field, relate to a kind of fainter light detector, be specifically related to a kind of based on three generations's sticking-type image intensifier fainter light detector of local gating at normal temperatures.
Background technology
The lll night vision technology is widely used in fields such as traffic, TV, communication, medical and health, military affairs.Through nearly 30 years high speed development, how to improve the dynamic range that the low-light level imaging system surveys and become an important topic in this field, and the key that solves this problem is how to improve the micro light detecting limit and how normal imaging and do not damage detector under high light.
Aspect the raising micro light detecting limit, having developed detection limit abroad is 10
-9The CCD of lx illumination (charge coupled device) video camera, German B﹠amp; M spectrum company is increased to 10 with the detection limit of ccd video camera under-150 ℃ of temperature
-11Lx.Low temperature micro light detecting device has very high signal to noise ratio (S/N ratio), but its volume heaviness, technical difficulty height, involves great expense, and causes application very limited.China is at low-light (10
-6Lx) extensive studies has been launched in the field, Xi'an optical precision optical machinery research institute of the Chinese Academy of Sciences and Changchun optical precision optical machinery research institute to surpass two generation image intensifier carried out deep research, Beijing Institute of Technology, Institutes Of Technology Of Nanjing are also carrying out the years of researches discussion aspect the raising night vision device image quality, and Xi'an Applied Optics Research Inst. and Beifang Night-vision Technology Co., Ltd. have also entered laboratory stage in the research of three-generation image enhancer.
How adapt to aspect the high light, external existing the 4th generation image intensifier, by on photocathode, applying pulsed auto switching voltage, make and reduce the electron stream that enters microchannel plate when illumination is extremely strong that avoid it saturated, the image that makes generation is uniformity all the time; In addition, automatically gate is as the method for another kind realization gating, and the permission image tube is in the field of illumination and still produce the good high resolution image of contrast daytime, and does not produce fuzzy image, enlarged the dynamic usable range of gleam image intensifier, but the details of this technology enforces a blockade to China.Chinese Academy of Sciences's Xi'an ray machine people such as the yellow soughing of the wind in forest trees at two generation image intensifier shortcoming, designed automatic gate power supply and replaced the scheme of DC high-voltage power supply for the power supply of second generation image intensifier, improved to a certain extent two generation image intensifier dynamic usable range.The people such as Sun Yafen of Xi'an north photoelectricity company utilize optical system to carry out automatic Light and control and protect the image intensifier of working under the high light condition.
But, aspect the raising detection limit, though the various devices of above-mentioned research and development have the effect of strengthening and doubling to the electronics that image intensifier produced, but electronics effectively can not accumulated, and only be by CCD photon signal to be accumulated for a long time, therefore, the performance of CCD has limited the micro light detecting limit to a great extent by 10
-6Lx brings up to 10
-8Lx; And aspect the detection of realization high light, existing detector is all whole gating, and certain zone is equal to or greater than 10
5Lx crosses high light can't carry out part control, has influenced image quality.
Summary of the invention
The purpose of this invention is to provide a kind ofly based on three generations's sticking-type image intensifier fainter light detector of local gating at normal temperatures, the detection limit of fainter light detector that not only will adopt three-generation image enhancer is by 10
-6Lx brings up to 10
-8Lx, and can be to 10
-5The high light of crossing of lx carries out local gating, and guarantees image quality.
The technical solution adopted in the present invention is, a kind of based on three generations's sticking-type image intensifier fainter light detector of local gating at normal temperatures, comprise detector housing, detector housing is divided into two cavitys up and down, be disposed with photometry CCD in the upper cavity, video acquisition module, field programmable gate array, liquid crystal driver module, power supply and display screen, the outside end that joins with photometry CCD of upper cavity is provided with camera lens A, the other end outer setting of upper cavity has button, be disposed with liquid crystal board in the following cavity, magnetic mirror array image intensifier, optical fiber cone and imaging CCD, the outside end that joins with liquid crystal board of following cavity is provided with camera lens B, and camera lens A and camera lens B are arranged side by side.
Feature of the present invention also is,
Magnetic mirror array image intensifier comprises negatron affinity photocathode and the microchannel plate that be arranged in parallel, to being disposed with preposition proximity focus electron-optical system and magnetic mirror array apparatus the microchannel plate, the outside of microchannel plate is disposed with rearmounted proximity focus electron-optical system and high brightness video screen by negatron affinity photocathode.
The magnetic mirror array apparatus is two-dimentional palisade face battle array, the support that comprises annular, be provided with the palisade permanent magnet in the ring of support, the palisade permanent magnet laterally has been arranged side by side a plurality of through holes, through hole passes the per pass grid of palisade permanent magnet, and corresponding through hole is positioned at same axis on the per pass grid, constitutes a plurality of little magnetic mirror array of palisade and proper alignment, the palisade permanent magnet is respectively arranged with electrode along the both sides of support axis direction, is provided with packing ring between electrode and the palisade permanent magnet.
The both ends of the surface of microchannel plate are posted ion feedback preventing film.
Liquid crystal board is installed in the optical system before the magnetic mirror array image intensifier, be coupled in negatron affinity photocathode by fibre faceplate before, and be positioned at the imaging surface of this optical system.
The beneficial effect of detector of the present invention is:
1. in image tube inside photoelectron is accumulated, changed the mode of existing CCD accumulation light signal, reduced dependence to a certain extent CCD.
2. adopt two-dimensional array magnetic mirror array apparatus, can make full use of the electronics that gleam image intensifier produces, reduce the escape probability of photocathode outgoing electron in magnetic mirror, photoelectron signal is more effectively accumulated.
3. do not need Cryo Equipment, the low-light level imaging detection limit can be increased to 10 under the normal temperature
-8The illumination of lx.
4. magnetic mirror adopts the bigger rubidium iron B permanent magnetic material of remanent magnetism to make, and its Curie temperature is 312 ℃, can accumulate photoelectron well under the normal temperature, and can pass through the enhancing of the accumulation realization of long period to atomic low light level signal, thereby reach 10
-8Blur-free imaging under the lx illumination.
5. adopt liquid crystal board that the light intensity of object scene is carried out local printing opacity control, protection photocathode and microchannel plate simultaneously, guarantee each device operate as normal under the high light condition.
6. can suitably regulate the voltage of liquid crystal board and the relation of transmitance as requested, realize that fainter light detector is 10
5Operate as normal under the lx illumination environment
7. single pixel can independently be controlled, and realizes local light intensity gating.
Description of drawings
Fig. 1 is the structural representation of detector of the present invention;
Fig. 2 is the structural representation of magnetic mirror array image intensifier in the detector of the present invention;
Fig. 3 is the structural representation of magnetic mirror array apparatus in the detector of the present invention; Wherein, a is a front view, the stretch-out view of b inner structure;
Fig. 4 is a detector operation schematic diagram of the present invention;
Fig. 5 is single little magnetic mirror unit produces in the magnetic mirror array apparatus of the detector of the present invention magnetic-mirror field constraint principles figure to electronics;
Fig. 6 is the liquid crystal response time of adopting in the detector of the present invention and the graph of relation of voltage magnitude.
Among the figure, 1. camera lens A, 2. camera lens B, 3. photometry CCD, 4. video acquisition module, 5. field programmable gate array, 6. liquid crystal driver module, 7. power supply, 8. detector housing, 9. cavity A, 10. display screen, 11. buttons, 12. dividing plate, 13. imaging CCD, 14. cavity B, 15. optical fiber cone, 16. magnetic mirror array image intensifiers, 17. liquid crystal boards, 18. negatron affinity photocathode, 19. magnetic mirror array apparatus, 20. microchannel plates, 21. preposition proximity focus electron-optical system, 22. rearmounted proximity focus electron-optical systems, 23. high brightness video screens, 24. little magnetic mirror array, 25. palisade permanent magnets, 26. supports, 27. electrode, 28. packing rings.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The structure of detector of the present invention, as shown in Figure 1.The detector housing 8 that comprises hollow, detector housing 8 is divided into cavity A9 and cavity B14 by dividing plate 12, be disposed with photometry CCD3 in the cavity A9, video acquisition module 4, field programmable gate array 5, liquid crystal driver module 6, power supply 7 and display screen 10, the end that the outside of cavity A9 and photometry CCD3 join is provided with camera lens A1, the other end outer setting of cavity A9 has button 11, be disposed with liquid crystal board 17 in the cavity B14, magnetic mirror array image intensifier 16, optical fiber cone 15 and imaging CCD13, the outside end that joins with liquid crystal board 17 of cavity A9 is provided with camera lens B2, and camera lens A1 and camera lens B2 are arranged side by side.
The structure of magnetic mirror array image intensifier 16 in the detector of the present invention, as shown in Figure 2.Comprise the negatron affinity photocathode 18 and the microchannel plate 20 that be arranged in parallel, from negatron affinity photocathode 18 to being disposed with preposition proximity focus electron-optical system 21 and magnetic mirror array apparatus 19 microchannel plate 20, the outside of microchannel plate 20 is disposed with rearmounted proximity focus electron-optical system 22 and high brightness video screen 23, and ion feedback preventing film is posted in the two sides of microchannel plate 20.
The structure of magnetic mirror array apparatus 19 in the detector of the present invention is shown in Fig. 3 a, 3b.Comprise the round outside but spuare inside ring support 26 that adopts copper or pottery to make, the madial wall of support 26 is a bayonet socket, be provided with the palisade permanent magnet of making by permanent magnetic material rubidium iron boron 25 in the Q-RING of support 26, palisade permanent magnet 25 is affixed by the bayonet socket and the support 26 of support 26 madial walls, palisade permanent magnet 25 magnetizes and is provided with a plurality of through holes in the direction (laterally) perpendicular to the palisade magnetic sheet, palisade permanent magnet 25 respectively is provided with one deck electrode 27 along the both sides of support 26 axis directions, one deck infiltration electrode that this electrode 27 plates respectively for palisade permanent magnet 25 both sides, or the gate electrode that is made of metal, be provided with the packing ring 28 that pottery is made between electrode 27 and the palisade permanent magnet 25, corresponding through hole is positioned at same axis on the per pass grid of palisade permanent magnet 25, constitutes a plurality of little magnetic mirror array 24 of palisade and proper alignment.
Liquid crystal board 17 in the detector of the present invention is selected high temperature polysilicon tft liquid crystal display board HTPS TFT-LCD for use.This LCD panel is the infiltration type LCD of driven with active matrix mode, have small-sized, high meticulous, high-contrast, driver can be built-in etc. characteristics.Physical dimension 3.3cm (diagonal line), built-in source matrix driving circuit, pointwise addressing, several 1024 (H) * 768 (V)=786,432 of dot matrix; Its inner liquid crystal adopts twisted nematic liquid crystals material, built-in nothing crosstalk circuit and no ghost line circuit, and the raising display quality, when optical wavelength was 630nm, the transmitance of LCD panel was 30%.High temperature polysilicon tft liquid crystal display board has the characteristic of quick response, is fit to optical information processing, and applied signal voltage is 8 bitmaps of 1024 * 768, and promptly gray scale is 2
8The gray-scale map on=256 rank, during making alive, display image is not 255 gray scales, the voltage that is applied to single pixel becomes nonlinear relationship with the gray-scale value of input picture.Liquid crystal board 17 is installed in the optical system before the magnetic mirror array image intensifier 16, be coupled in negatron affinity photocathode 18 by fibre faceplate before, and be positioned at the imaging surface of this optical system.
Detector operation principle of the present invention, as shown in Figure 4.Magnetic mirror array image intensifier 16 wherein cooperatively interacts with liquid crystal board 17, and detector is worked in the photoenvironment of different light intensity:
1. the gating of the low light level is surveyed
Only open camera lens A1, photometry CCD3, video acquisition module 4, field programmable gate array 5, liquid crystal driver module 6 and liquid crystal board 17, gather current images information by camera lens A1, and this image information is transferred to photometry CCD3, photometry CCD3 is converted to vision signal with the image information that receives, this vision signal is delivered to video acquisition module 4, video acquisition module 4 is converted to digital signal with the vision signal that receives, and with this digital data transmission to field programmable gate array 5, the digital signal of 5 pairs of receptions of field programmable gate array scans.If all pixel light intensity values are all less than the max-thresholds of magnetic mirror array image intensifier 16 operate as normal, then field programmable gate array 5 is not handled image, the full impregnated signal is reached liquid crystal board 17, the transmitance that makes each pixel of liquid crystal in the liquid crystal board 17 is for maximum, open camera lens B2 simultaneously, magnetic mirror array image intensifier 16 and imaging CCD13, control by the magnetic mirror array apparatus 19 in 5 pairs of magnetic mirror arrays of field programmable gate array image intensifier 16, magnetic mirror array apparatus 19 begins low light level signal is accumulated, artificially control integration time, when the photoelectron of accumulation reaches the imaging threshold value of imaging CCD13 in the magnetic mirror array apparatus 19, electrode application voltage at magnetic mirror array apparatus 19 two ends, the electronics of accumulation in the magnetic mirror array apparatus 19 is drawn, go forward side by side into microchannel plate 20, bombardment high brightness video screen 23, imaging CCD13 accepts to reach the function of surveying the low light level through the image information after strengthening.
2. light gating is from weak to strong surveyed
Only open camera lens A1, photometry CCD3, video acquisition module 4, field programmable gate array 5, liquid crystal driver module 6 and liquid crystal board 17, gather current images information by camera lens A1, this image information is delivered to photometry CCD3, photometry CCD3 is converted to vision signal with the image information that receives, and this vision signal passed to video acquisition module 4, video acquisition module 4 is converted to digital signal with the vision signal that receives, and this digital signal reached field programmable gate array 5, the digital signal of 5 pairs of receptions of field programmable gate array scans.If the light intensity of partial pixel surpasses the max-thresholds of magnetic mirror array image intensifier 16 operate as normal in this digital signal, then find the overexposure pixel by field programmable gate array 5, under NIOS processor software platform, according to image processing algorithm this row pixel picture signal is carried out assignment again with C Plus Plus based on the YUV color mode, and write the processed images signal among the SRAM line by line, at last, interrupt transmission by DMA the data among the SRAM are write liquid crystal display drive circuit 6, the overexposure pixel is adopted than low transmission, other pixels that are lower than threshold value keep maximum transmission, like this, the then exportable output signal that satisfies appropriate level of contrast in action is finished the control to each pixel of liquid crystal; Then, open camera lens B2, magnetic mirror array image intensifier 16 and imaging CCD13, and 19 pairs of photoelectrons of magnetic mirror array apparatus of controlling in the magnetic mirror array image intensifiers 16 by field programmable gate array 5 accumulate, and artificially control integration time, when the photoelectron of accumulation reaches CCD13 imaging threshold value in the magnetic mirror array apparatus 19, electrode application voltage at magnetic mirror array apparatus 19 two ends, electronics is drawn in magnetic mirror array apparatus 19, go forward side by side into microchannel plate 20, bombardment high brightness video screen 23, imaging CCD13 accepts through the image information after strengthening, the operate as normal when realizing occurring under the low light level background local high light and the function of blur-free imaging.
3. the gating of high light is surveyed
Only open camera lens A1, photometry CCD3, video acquisition module 4, field programmable gate array 5, liquid crystal driver module 6 and liquid crystal board 17, gather current images information by camera lens A1, this image information is delivered to photometry CCD3, photometry CCD3 is converted to vision signal with the image information that receives, and with this video signal transmission to video acquisition module 4, after video acquisition module 4 is converted to digital signal with the vision signal that receives, this digital signal is flowed to field programmable gate array 5, and the digital signal of 5 pairs of receptions of field programmable gate array scans.If the whole pixel light intensity in this digital signal are all above the threshold value of magnetic mirror array image intensifier 16 operate as normal, then find light intensity stronger pixel relatively by field programmable gate array 5, to the output of all pixels than the low-transmittance signal, and to light intensity greater than 10
5The high light of crossing of lx is exported minimum transmitance signal; Then, open camera lens B2, magnetic mirror array image intensifier 16 and imaging CCD13, at this moment, magnetic mirror array apparatus 19 two end electrodes places in magnetic mirror array image intensifier 16 apply constant voltage, make the electronics of negatron affinity photocathode 18 outgoing can directly enter microchannel plate 20 by magnetic mirror array apparatus 19 smoothly and not restrained and accumulation, bombardment high brightness video screen 23 also uses imaging CCD13 to accept through the image information after strengthening, to reach the function of normal imaging under the high light.
The magnetic-mirror field that single little magnetic mirror unit produces in the magnetic mirror array apparatus 19 of detector of the present invention is to the constraint electronic schematic of electronics, as shown in Figure 5.Magnetic mirror is (to be made as B a little less than a kind of centre
1), two ends (are made as B by force
2) special magnetic field configuration.The simple magnetic-mirror field that permanent-magnetic clamp constituted of the identical and parallel placement that is spaced a distance of shown in Figure 5 is two magnetic directions, the gradual magnetically confined electronics in the magnetic mirror are that the magnetic moment conservation effect by electron production realizes.When magnetic field B in time with the space when gradual, the electronic magnetic moment size is a constant in the magnetic field, electron magnetic moment can be used following formulate:
In the formula, v
⊥Be perpendicular to the transverse velocity of magnetic direction electronics; M is an electron mass; B is a magnetic induction density.
Because Lorentz force is to not work done of electronics, therefore from the electronics of magnetic mirror middle part incident, its gross energy conservation, i.e. horizontal kinetic energy and to be parallel to vertical kinetic energy sum of magnetic direction constant.When electronics moved in magnetic-mirror field, the variation of magnetic field B caused horizontal kinetic energy constantly to change, thereby caused horizontal kinetic energy and vertical kinetic energy to transform mutually, and trajectory of electron motion has also just formed the motion of similar " reflection " phenomenon.
Magnetic-mirror field is strong more good more to the constraint ability of electronics, but always some electronics passes the maximum field B of magnetic mirror two ends (also being the magnetic larynx)
2The place escapes from magnetic mirror.The condition that electronics is escaped from magnetic mirror constraint is low-intensity magnetic field B at the magnetic mirror center
1The velocity of electrons component V and the V at place
⊥Need satisfy following relation:
Wherein, γ=B
2/ B
1Be mirror ratio; V
0Enter the initial velocity of magnetic mirror for electronics.
The magnetic mirror array apparatus 19 that preparation is finished, its mirror ratio γ is a fixed value.From (2) formula as can be known, if V
1/ V
0Enough big, and greater than
The time, electronics just can not be escaped from from magnetic mirror; And mirror ratio γ is big more, and the electronics of running out from the magnetic larynx is just few more, and the binding effect of magnetic mirror is just good more.
The noise analysis of magnetic mirror array apparatus 19 in the detector of the present invention,
Magnetic mirror array apparatus 19 is introduced magnetic mirror array image intensifier 16 as intermediate member, the structure of itself and performance produce certain influence to whole imaging system, comprise because collision causes the transition of electronics between the magnetic line of force, and magnetic mirror itself intrinsic factors such as escape cone.Magnetic line of force transition in Pixel Dimensions can not exert an influence to the complete transmission of image, and therefore, the noise that escape cone brings to system is only needs the problem be concerned about in the low-light level imaging process.
According to above-mentioned magnetic mirror principle, electron impact is during to a certain position of near axis, ratio B (the z)/B of the magnetic field intensity of this point and magnetic larynx place maximum field
MaxDetermined the size of this position escape taper angle theta (z), the expression formula that draws escape cone angle in optional position on the axis by derivation is:
Have only incident direction and axis angle could be fettered by magnetic field, otherwise electronics will be escaped from mirror machine, influence the long time integration and the imaging effect of low level light signal greater than the electronics of escape cone angle.
Magnetic mirror array apparatus 19 can make and keep less angle between the incident direction of electronics and the axis, the projectile energy of electronics and the minimum-B configuration of magnetic mirror also satisfy corresponding requirement simultaneously, and the electronics of incident is just fettered by magnetic mirror, and can not escape, therefore, the escape noise that brings of magnetic mirror array apparatus 19 is very little.
Magnetic mirror array apparatus 19 in the detector of the present invention, matching property is negatron affinity photocathode 18 preferably, can realize 10 in 2～3 hours integration time
-8Blur-free imaging under the lx illumination.
Liquid crystal response time series analysis
Response time is a very important parameter of liquid crystal material, each pixel of reactive mesogen is to the reaction velocity of input signal, different application has different requirements to response speed of liquid crystal, the response time that a certain liquid crystal material is discussed does not separately have practical significance, liquid crystal must be added circuit and constitute liquid crystal driver module 6, measure the response time of liquid crystal driver module 6.
Adopt SZ-04 laser instrument, GOS620 oscillograph and the JD-3 illuminometer of 650nm, 4mW, the phase difference between signals of signal with output liquid crystal by the input liquid crystal was measured the response time of liquid crystal driver module 6.Obtain sets of waveforms (oscillographic time sensitivity is 1ms) as shown in Figure 6.The response time that calculates liquid crystal driver module 4 according to this sets of waveforms is about 22ms, and the response time is in the requirement that promptly can realize about 16.7ms the Liquid Crystal Module response time, can be in time, fast the dynamic change of light intensity is made a response.
Detector of the present invention adopts magnetic mirror array apparatus 19, the photoelectron that photocathode is overflowed accumulates for a long time, replaced the mode of existing CCD to the light signal accumulation, use HTPS liquid crystal board 17 simultaneously, realization is to the automatic local gating control of light intensity, make detector have bigger dynamic usable range, can be 10
-8Lx to 10
5Operate as normal and blur-free imaging in the lx range of light intensity.
Claims (4)
1. one kind based on three generations's sticking-type image intensifier fainter light detector of local gating at normal temperatures, it is characterized in that, comprise detector housing (8), detector housing (8) is divided into two cavitys up and down, be disposed with photometry CCD (3) in the upper cavity, video acquisition module (4), field programmable gate array (5), liquid crystal driver module (6), power supply (7) and display screen (10), the outside end that joins with photometry CCD (3) of upper cavity is provided with camera lens A (1), the other end outer setting of upper cavity has button (11), be disposed with liquid crystal board (17) in the following cavity, magnetic mirror array image intensifier (16), optical fiber cone (15) and imaging CCD (13), the outside end that joins with liquid crystal board (17) of following cavity is provided with camera lens B (2), camera lens A (1) and camera lens B (2) are arranged side by side, described magnetic mirror array image intensifier (16) comprises negatron affinity photocathode (18) and the microchannel plate (20) that be arranged in parallel, to being disposed with preposition proximity focus electron-optical system (21) and magnetic mirror array apparatus (19) the microchannel plate (20), the outside of microchannel plate (20) is disposed with rearmounted proximity focus electron-optical system (22) and high brightness video screen (23) by negatron affinity photocathode (18).
2. detector according to claim 1, it is characterized in that, described magnetic mirror array apparatus (19) is two-dimentional palisade face battle array, the support (26) that comprises annular, be provided with palisade permanent magnet (25) in the ring of support (26), palisade permanent magnet (25) laterally has been arranged side by side a plurality of through holes, described through hole passes the per pass grid of palisade permanent magnet (25), corresponding through hole is positioned at same axis on the per pass grid, constitute a plurality of little magnetic mirror array (24) of palisade and proper alignment, described palisade permanent magnet (25) is respectively arranged with electrode (27) along the both sides of support (26) axis direction, is provided with packing ring (28) between electrode (27) and the palisade permanent magnet (25).
3. detector according to claim 1 is characterized in that, the both ends of the surface of described microchannel plate (20) are posted ion feedback preventing film.
4. detector according to claim 1, it is characterized in that, described liquid crystal board (17) is installed in the preceding optical system of magnetic mirror array image intensifier (16), and it is preceding to be coupled in negatron affinity photocathode (18) by fibre faceplate, and is positioned at the imaging surface of this optical system.
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| CN101995731B (en) * | 2010-07-30 | 2013-03-13 | 西安理工大学 | Liquid crystal-based direct-view anti-glare imager and anti-glare imaging method |
| CN107765287B (en) * | 2017-11-20 | 2023-11-14 | 中国工程物理研究院激光聚变研究中心 | Nuclear leakage detector and method for detecting pollution source by using same |
| CN110416056B (en) * | 2019-07-11 | 2021-10-22 | 西北核技术研究院 | High-gain mixed type photomultiplier based on microchannel plate |
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| FR2906076A1 (en) * | 2006-09-19 | 2008-03-21 | Lheritier Soc Par Actions Simp | Luminous image intensifier`s sensitivity control device, has processing unit associated to capturing zones of retina, and multilayer deposit with sectors electrically polarized by polarizing source based on lighting level detected by retina |
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