Image booster for improving microlight detection property of imaging system

Abstract

The image intensifier for improving low-light detection performance of an imaging system disclosed by the invention includes a photocathode, an electronic lens, a microchannel plate and a fluorescent screen, and is characterized in that a magnetic mirror is arranged between the photocathode and the electronic lens, and the magnetic mirror can adopt a micro Through electronic bottle plate structure or simple magnetic mirror plus electronic focusing lens structure. The magnetic mirror device is applied in the low-light detection and imaging system, which regulates the speed of electrons escaped from the photocathode and reduces the system noise; plays the role of an electronic lens to focus electrons; effectively improves the accumulation time of optical signals, which can make it Weak image signals with lower illuminance are detected to achieve the purpose of improving the detection limit of the low-light imaging system.

Description

technical field [0001] The invention belongs to the technical field of photoelectric imaging, and relates to an image intensifier for an imaging system, in particular to an image intensifier capable of improving low-light detection performance of the imaging system. Background technique [0002] Low-light detection CCD (Charge Coupled Devices) has important applications in civil, aerospace, military and other aspects. At present, it has launched a detection illuminance of 10 -9 lx, a CCD camera with a resolution greater than 700TV lines and a dynamic range of 4000:1. Cooled CCD cameras sold by B&M Spectroscopy in Germany, with a sensitivity of 10 at -150°C -11 lx, dynamic range 16000:1. The detection illumination should reach 10 -11 The level of lx can only be obtained under special low temperature conditions at present. [0003] Current Shimmer (10 -6 lx) There are four types of imaging CCD structures: image-enhanced IICCD (ImageIntensified Charge Coupled Devices), ele...

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Problems solved by technology

[0005] In order to solve the existing defects of using low temperature conditions to realize low-light detection, the purpose of the present invention is to provide an image intensifier that improves low-light detection performance, and can obtain low-light detection with higher signal-to-noise ratio and lower illuminance at room temperature purpose, the illuminance can reach 10 -11 x, and even higher, expanding the application field of imaging detection

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