System and method for increasing laser imaging resolution ratio under turbid water

Abstract

The invention discloses a system and a method for increasing a laser imaging resolution ratio under turbid water. The system comprises a laser incidence module and a laser imaging module, wherein thelaser incidence module comprises a blue / green pulse laser and an emission optical unit; an output end of the blue / green pulse laser is connected with an input end of the emission optical unit; the output end of the emission optical unit faces a target; the laser imaging module is used for receiving an imaging signal reflected by the target and comprises a receiving optical unit, a range gate unit,a non-linear photorefractive crystal, an imaging lens, a photoelectric probe, a digital signal delayer and an additional voltage source; the receiving optical unit, the range gate unit, the non-linear photorefractive crystal, the imaging lens and the photoelectric probe are sequentially connected; the digital signal delayer is connected with the range gate unit and the additional voltage source is connected with the non-linear photorefractive crystal. Backscattering noise is filtered out and an image contrast ratio is increased; the strength of non-linear self-focusing effects of noise-containing image light beams is controlled, so that gathering of forward scattering noise to image signals can be realized, and thus, the laser imaging resolution ratio of the target under the turbid watercan be increased.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a system and method for improving the resolution of laser imaging in turbid underwater. Background technique [0002] Laser underwater target detection and imaging technology has broad application prospects and important military strategic significance. At present, although laser underwater target imaging technology has made great progress, due to the high turbidity of seawater (near coastal seawater, bays, shallow seas, etc.), there are still many technical difficulties in its application in the marine field. The attenuation is large, which leads to the weak reflection signal of the underwater target; and the random scattering interference of the suspended matter in the water to the direction and intensity of the blue-green laser and the target image signal introduces forward scattering noise and back scattering noise, which will It leads to serious degradation of under...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a system and method for improving the resolution of turbid underwater laser imaging to solve the problem of large energy attenuation in the imaging of turbid underwater targets and the image contrast and resolution caused by forward scattering noise and backscattering noise. rate reduction problem

Images