Design of an active detection module for combating optical covert observation

Abstract

The invention discloses an active detection module for resisting optical covert observation, which includes a convex lens, a reflector, a concave lens, a two-dimensional fast mirror assembly, a hole-digging mirror, a beam splitter, a laser, a condenser lens, and a narrow-band filter 1. The first photoelectric avalanche tube, the detection amplifier circuit, the attenuation sheet, the second photoelectric avalanche tube and the main control module. According to the maximum light intensity of laser emission and the maximum light intensity of laser echo, the present invention calculates the target distance value and reflectivity, and can realize the rough detection of reflectivity of optical lens of different materials such as visible light, mid-infrared, and far-infrared, and adopts similar reflectance distribution The area and the corresponding similar reflectivity, combined with the optical lens type-lens reflectivity-optical lens area table, can realize the preliminary judgment of the type of optical concealed observation equipment; solve the problem that it is difficult to detect concealed optical observation equipment in the day and night environment; High sensitivity, wide applicable wavelength range and low power consumption.

Description

technical field [0001] The invention relates to the design of an active detection module for countering optical concealment observation in the fields of national defense, public security, armed police, anti-terrorism and security protection, and can realize active detection of concealed optical observation equipment in day and night environments. Background technique [0002] The development of optoelectronic technology has promoted the rapid development of optoelectronic passive observation equipment, and promoted the wide application of passive observation equipment based on visible light imaging, low-light night vision imaging, and mid-to-far infrared imaging in national defense, security, and other fields. Then, due to its passive observation characteristics, finding such targets becomes a difficult point in the adversarial field. [0003] Optical covert observation generally considers the common observation methods of the detector, such as visible light CCD or infrared ...

AI Technical Summary

Problems solved by technology

[0004] The existing active detection method adopts laser active illumination, and utilizes the "cat's eye effect" of the optical lens assembly of the optical observation equipment to cause strong reflection signals different from surrounding targets, combined with the optical focal plane array imaging component to realize the rapid detection of hidden targets. This method has two main disadvantages: First, the active detection laser must be within the working wavelength range of the lens of the optical covert observation equipment, and the incident angle must be within the field of view of the optical lens, such as long-wave infrared observation, while short-wave infrared The "cat's-eye effect" cannot be produced when the laser in the wavelength band irradiates it. If the incident angle of the laser deviates from the field of view of the optical lens, the "cat's-eye effect" will not be produced; the second is the combination of laser illumination and focal plane array imaging detector. The active detection laser has relatively strong power, the far-field energy distribution density of the light field is relatively uniform, and the imaging detector has high sensitivity, and there are also some restrictions on the working distance

Images