Laser radar based on highly-correlated quantum imaging principle

Abstract

The invention discloses laser radar based on a highly-correlated quantum imaging principle, which consists of a pulse laser, a parameter down-conversion non-linear device, a receiving lens, a photon detector, an imaging lens, an area-array detector, a time delay correlator and a signal processor. The pulse laser transmits laser pulse to generate two laser beams having different wavelengths and the highly correlation by parameter down-conversion non-linear device, one path of laser beam with long wavelength is irradiated on a measured object and is focused on a photon detector through a receiving lens to detector after being reflected, and a switch signal indicative of the detecting result of the photon is output; the other path of laser beam with short wavelength is irradiated to the area-array detector through an imaging lens to acquire a two-dimension photon image signal; and two paths of signals are correlated and integrated by the signal processor to acquire image and distance information of the measured object. The laser radar effectively solves the problem of transmission loss by using the laser with the long wavelength in an atmosphere window to realize the ultra-long distance detection and realize the super-resolution detection by using the highly-correction effect.

Description

Technical field [0001] The invention relates to a laser radar, in particular to a laser radar based on the principle of strong correlation quantum imaging. Background technique [0002] Lidar imaging system is a system that uses laser to actively illuminate the target to obtain target image and distance information. In this way, a pulsed laser illuminator emits laser pulses of a certain frequency to illuminate the target, and then the pulsed laser signal reflected by the target is collected by an image acquisition device that can receive the laser for imaging, and the distance of the target is obtained by calculating the flight time of the laser pulse information. Compared with microwave radar, laser has a shorter wavelength to achieve accurate imaging of the measured target, and can obtain more spectral characteristics of the target, such as the composition and concentration information of different substances in the atmosphere. Compared with ordinary TV imaging, lidar can obt...

AI Technical Summary

Problems solved by technology

There are certain problems in both of these methods: beam scanning imaging requires rapid scanning of the laser beam and then point-by-point detection imaging. This method has a slow imaging speed and is limited by the beam quality and deflection control accuracy. The resolution is not high; the other method of area array reception imaging is limited by the sensitivity and imaging speed of the area array detector, which cannot meet the requirements of long-distance high precision, especially for the laser wavelength of the mid-infrared atmospheric window.

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