A system and method for improving the resolution of laser imaging in turbid underwater
An underwater laser and laser imaging technology, applied in the field of optical imaging, can solve the problems of large energy attenuation, image contrast and resolution reduction, etc.
Active Publication Date: 2021-09-14
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[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
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[0042] In order to make the purpose, advantages and features of the present invention more clear, a system and method for improving the resolution of laser imaging in turbid underwater proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that: the drawings are all in a very simplified form and use inaccurate proportions, which are only used to facilitate and clearly illustrate the purpose of the embodiments of the present invention; secondly, the structures shown in the drawings are often actual structures part; again, each drawing needs to display different emphasis points, and sometimes adopts different scales.
[0043] First, see figure 1, the present invention provides an underwater laser imaging system with an imaging resolution of a target object 11 u...
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Abstract
The invention discloses a system and method for improving the resolution of laser imaging in turbid underwater, including: a laser incident module, the laser incident module includes a blue-green pulse laser and an emission optical unit, the output end of the blue-green pulse laser is connected to the The input ends of the emitting optical unit are connected, and the output end of the emitting optical unit faces the target; and the laser imaging module receives the imaging signal reflected by the target object, and the laser imaging module includes a receiving optical unit connected in sequence, a distance selection A pass unit, a nonlinear photorefractive crystal, an imaging lens, a photodetector, a digital signal delayer connected to the range gating unit and an external voltage source connected to the nonlinear photorefractive crystal. Filter the backscatter noise and improve the image contrast; then control the intensity of the nonlinear self-focusing effect of the noisy image beam to realize the forward scattering noise to the image signal, thereby improving the resolution of the laser imaging of the turbid underwater target.
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...
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IPC IPC(8): G01S17/89H04N5/57
CPCG01S17/89H04N5/57
Inventor 王昭路刘红军黄楠张永斌池娇
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI