Partial gating glimmer detector of image intensifier based on secondary generation inverted image at normal temperature

Abstract

The invention discloses a low light level detector which is based on a second generation inverting 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 body and a lower cavity body; 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 body; one end, which is connected with the light measurement CCD, outside the upper cavity is provided with a lens A; the other end of the upper cavity is provided with a pushbutton; a liquid crystal board, a 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 and the lens B are parallelly arranged. The detector changes the mode of the prior CCD to the integration of optical signals, adopts the HTPS liquid crystal board simultaneously, automatically performs local gate control on light intensity, has wider dynamic application range, and can normally work and clearly image within the light intensity range of between 10<-8> and 10<5>lx.

Description

technical field [0001] The invention belongs to the technical field of photoelectric imaging detection, and relates to a low-light detector, in particular to a low-light detector based on a second-generation inverted image intensifier and partially gating at normal temperature. Background technique [0002] Low-light night vision technology is widely used in transportation, television, communications, medicine and health, military and other fields. After nearly 30 years of rapid development, how to improve the dynamic range of low-light imaging system detection has become an important topic in this field, and the key to solving this problem lies in how to improve the low-light detection limit and how to perform normal imaging under strong light without damaging the detector. [0003] In terms of improving the low-light detection limit, foreign countries have developed a detection limit of 10 -9 CCD (Charge Coupled Device) camera with lx illuminance, German B&M Spectrum Com...

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Problems solved by technology

[0005] However, in terms of improving the detection limit, although the various devices researched and developed above have the effect of strengthening and multiplying the electrons generated by the image intensifier, they have not been able to effectively accumulate the electrons, but only use the CCD to detect the photon signal. long-term accumulation, therefore, the performance of the CCD is largely limited by the low-light detection limit by 10 -6 lx increased to 10 -8 lx; and in the realization of strong light detection, the existing detectors are all gating as a whole, which is equal to or greater than 10 for a certain area -5 The too strong light of lx cannot be controlled locally, which affects the image quality

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