Laser active detection device based on tunable liquid crystal variable refractive index

Abstract

The invention discloses a laser active detection device based on a tunable liquid crystal variable refractive index, which relates to the technical field of photoelectric detection. The device comprises a laser, a collimating lens group, a tunable liquid crystal variable refractive index element, an extending lens group and a liquid crystal unit controller, wherein the collimating lens group is used for enabling light beams emitted by the laser to form collimating light; the self refractive index of the tunable liquid crystal variable refractive index element is changed to enable the collimating light focusing position to be changed in a reciprocating mode along an optical axis; the extending lens group is used for extending the collimating light; the liquid crystal unit controller controls the refractive index of the tunable liquid crystal variable refractive index element; and the laser, the collimating lens group, the tunable liquid crystal variable refractive index element and the extending lens group are arranged sequentially with the same optical axis. The periodic oscillation tuning of the focal power can be realized, the scanning frequency is high, fast and efficient scanning on the focal plane of a detected system in a target space domain can be realized, cat eye effect matching is realized, and the detection probability of the detected system is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a laser active detection device based on tunable liquid crystal variable refractive index. Background technique [0002] Using the "cat's eye effect" of the enemy's photoelectric detection system can effectively detect, destroy or blind the enemy's photoelectric system. Based on the current "cat's eye detection" research, the main factor affecting the detection probability of the enemy's photoelectric detection system is whether the active light source of the laser active detection system can focus on the focal plane or the reticle of the detected system, which we call is the defocus of the active detection system to the detected system. When the active detection laser beam is defocused from the focal plane of the detected system, the reflected energy generated by the "cat's eye effect" will decay exponentially, which will affect the echo receiving efficiency of ...

AI Technical Summary

Problems solved by technology

When the active detection laser beam is defocused from the focal plane of the detected system, the reflected energy generated by the "cat's eye effect" will decay exponentially, which will affect the echo receiving efficiency of the receiving subsystem in the active detection system, thereby affecting the laser beam. The overall detection efficiency of the active detection system

[0003] Starting from practical engineering applications, since the active detection wavelength of the active detection system usually uses a near-infrared laser light source, the wavelength is single

However, the designed spectral range of the detected system is very wide, which means that the active detection laser light source will inevitably produce chromatic aberration with the detected system, so the above-mentioned defocus between the active beam and the detected system is almost inevitable, which leads to The main reason for the reduction of the detection distance of the current laser active detection system

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