Multi-pulse range gated imaging system and method

Abstract

The invention, which belongs to the imaging system field, discloses a multi-pulse range gated imaging system and method. The system is composed of a pulsed laser, a laser receiver, and an imaging unit; the laser receiver is coupled with the imaging unit; and the laser receiver is arranged on a light path formed by reflection of a laser pulse transmitted by the pulse laser by an imaging object. The pulse laser transmits a plurality of laser pulses successively at intervals according to a preset transmitting interval; each transmitted laser pulse is reflected by the imaging object and then is received successively by the laser receiver according to a preset gating interval; the laser receive inputs the each received laser pulse into the imaging unit; and the imaging unit forms an image by using the multiple laser pulses received within preset exposure time. The invention aims at providing a multi-pulse range gated imaging system and method, thereby improving a quality of an image based on range gated imaging.

Description

technical field [0001] The invention relates to the field of imaging systems, in particular to a multi-pulse range-gated imaging system and method. Background technique [0002] After the pulsed laser is output from the laser window, the time of the light pulses reflected (or scattered) at different distances is different. By using a high-speed shutter control at the receiving end, only the laser pulses returned at a certain distance are received, and other irrelevant lights are are blocked out, the imaging method is known as range-gated imaging. [0003] Since the range-gated imaging only images the target at a certain distance, the return light of other different distances on the propagation path of the illumination light cannot enter the receiving system for imaging, so this technology has a very strong ability to suppress ambient light and can effectively highlight the target to be observed , can play a great role in underwater target imaging, lidar and other applicatio...

AI Technical Summary

Problems solved by technology

[0005] In an environment where the propagation medium has a large loss to the laser, for example, underwater, the attenuation of the laser pulse during propagation is very large, that is, it increases exponentially with the increase of the propagation path, so in the propagation path After reaching a certain value, the signal of the laser pulse reflected by the object received by the camera of the range-gated imaging system is very weak, resulting in very low imaging quality

[0006] To obtain an effective gated image using the existing range-gated imaging system, the light energy of the illumination laser can only be increased, but in many cases the light energy of a single pulse of a pulsed laser cannot be increased without limit

This limits the technique to higher gating distances and image quality

Images