Range-gated imaging system and method based on back scattering illumination

Abstract

An embodiment of the invention provides a range-gated imaging system and method based on back scattering illumination, and belongs to the field of range-gated imaging. The system includes a pulse laser and an imaging device, the imaging device is arranged in a propagation path of back scattering light of a medium in a gated region behind a target object, wherein the back scattering light is scattering light emitted to the target object by laser pulses after being scattered by the medium in the gated region, the laser pulses being emitted by the pulse laser; the laser pulses emitted by the pulse laser according to preset emission time form back scattering light after being scattered by the medium of the gated region behind the target object, the back scattering light is emitted to the imaging device, and the imaging device generates an image after receiving the back scattering light according to preset gating time. The range-gated imaging system based on back scattering illumination can prevent the intensity of signal light reflected by the target object from being too weak when the target object is a mirror reflection object or strongly absorbs an illumination laser wavelength, and prevent imaging quality from being too poor.

Description

technical field [0001] The invention relates to the field of range-gated imaging, in particular to a range-gated imaging system and method based on backscattered illumination. 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 distances on the illumination light propagation path 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. It can play a great role in underwater target imaging, lidar and oth...

AI Technical Summary

Problems solved by technology

[0004] Since the traditional range-gated imaging receives the scattered light of the illumination laser from the object, the prior art requires the illuminated target to have a strong light scattering ability. When the target is a specular reflection object or strongly absorbs the wavelength of the illumination laser (such black object), the signal light intensity obtained by the existing technology will be too weak, making the imaging quality of the traditional range-gated imaging system very low

[0005] In addition, when the technology needs to be applied to gated imaging over a long distance (such as 1m to 20m), due to the exponential attenuation of light intensity during transmission, objects at the near end (1m) and objects at the far end (20m) get The intensity of the illumination light varies greatly, so it is often impossible to obtain effective imaging at the same time

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