Line scanning imaging device

Abstract

Disclosed in the invention is a line scanning imaging device. A line laser source and intensity modulation module (1) generates one-dimensional detection laser with random intensity distribution; a beam space shaping module (2) carries out space shaping on detection laser; a line scanning and emission module (3) carries out illumination on a target area by using long and narrow bar-shaped detection laser and line scanning is realized; a signal returned by a target is collected by an echo collection module (4); a light intensity point detection module (5) receives the signal; a line scanning image reconstruction module (6) carries out association calculation on the received point detection signal and light intensity distribution at the target position to realize reconstruction; and an image splicing module (7) carries out splicing of all bar-shaped imaging results to obtain an image of the target area. According to the invention, the linear array scanning illumination and point detection are combined, so that a long detection distance is obtained; and association calculation time is reduced based on one-dimensional image reconstruction. The method can be applied to scanning and imaging of a target during moving target imaging or rapid movement.

Description

technical field [0001] The invention relates to the technical field of optical imaging, and more particularly to a scanning imaging device based on a line detection light source and a point receiving detector that can image a long-distance and moving target. Background technique [0002] Traditional laser scanning imaging methods include point scanning and line scanning. The point scan method has low resolution and slow speed; the line scan method needs to use CCD or other array detectors as the receiving end, and the array detector has limited performance such as noise, response speed, and sensitivity, which limits the increase of imaging distance and imaging speed. . [0003] Generally speaking, point detection has higher noise control performance, response speed and higher sensitivity than linear array detection, but conventional point detection generally uses pixel-by-pixel detection and reconstruction of the target, so the laser repetition frequency Higher requirement...

AI Technical Summary

Problems solved by technology

[0005] During the sampling period, the relative motion between the target and the system will cause problems such as image degradation, making it difficult to achieve fast point detection imaging for moving targets

The existing motion compensation method is to perform translation compensation on the light field intensity distribution recorded by the reference arm detector, and the device and method are complicated and impractical

Generally speaking, the point detection imaging method currently researched is only suitable for imaging static targets or extremely low-speed targets, and point detection imaging for moving target imaging is still a hot spot and difficult point in current imaging research.

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