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Laser ultrasonic underwater target detection method and system based on interferometric synthetic aperture

A technology for interfering with synthetic apertures and underwater targets, applied in the field of underwater target detection, can solve problems such as impact and inaccurate survey, and achieve the effects of enhanced detection accuracy, high precision, and small divergence

Pending Publication Date: 2021-10-26
HARBIN INST OF TECH AT WEIHAI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The present invention is aimed at the problem that the data collected by the existing underwater target detection equipment and methods are easily affected by the water body environment and cannot be accurately surveyed, and proposes a laser ultrasonic underwater target contour detection method based on interference synthetic aperture to overcome the above problems And the system, by unwrapping the interferometric phase to invert the underwater target contour detection and depth positioning

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  • Laser ultrasonic underwater target detection method and system based on interferometric synthetic aperture
  • Laser ultrasonic underwater target detection method and system based on interferometric synthetic aperture
  • Laser ultrasonic underwater target detection method and system based on interferometric synthetic aperture

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Embodiment 1

[0059] Such as figure 1 and figure 2 As shown, in one embodiment of the present invention, a laser ultrasonic underwater target detection system is provided, including a laser control and excitation module, a data receiving module and a post-processing module. The laser control and excitation module is controlled by the industrial computer, realizes the excitation and deflection scanning of the laser in the air, and connects the data receiving module to complete the data collection and signal type conversion and sends it to the post-processing module. data for analysis. The laser control and excitation module is composed of Nd:YAG pulse laser, beam splitter, and prism, and the data receiving module includes a fiber optic hydrophone, a preamplifier, a filter, a data acquisition card, and an A / D converter. The post-processing module described above includes a demodulation system and an oscilloscope.

[0060] The specific scheme and connection relationship are as follows:

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Abstract

The invention relates to a laser ultrasonic underwater target detection method and system based on an interference synthetic aperture, and the method is characterized in that a laser control unit of an industrial personal computer completes the excitation of a pulse laser, transmits a pulse laser beam, and forms two independent light beams with different paths after a single narrow pulse is acted by a beam splitter; and then the two beams of homologous pulse laser are reflected through prisms to complete light path deflection, so that the two beams of homologous pulse laser are emitted into water at different moments and generate a photoacoustic effect, ultrasonic waves are generated in liquid and radiated and propagated, a sound field signal acting on a target object is received through an optical fiber hydrophone, and then through amplification, filtering and denoising processing, two groups of signals are collected and sent to an A / D converter for signal conversion, demodulation of the signals is finally completed, sound field time domain and frequency domain conditions of an underwater target object are displayed through an oscilloscope, data are provided for an industrial personal computer to complete processing and analysis of an interference synthetic aperture, and then contour detection and depth positioning measurement and calculation of the underwater target object are achieved.

Description

Technical field: [0001] The invention relates to the field of underwater target detection, in particular to a laser ultrasonic underwater target detection method and system based on interference synthetic aperture. Background technique: [0002] Accurate positioning of underwater targets and accurate survey of seabed topography have always been technical difficulties in the field of marine military and underwater industry. With the official opening of the Beidou-3 global satellite navigation system, my country has made great progress in fast and real-time positioning of targets. However, the accurate underwater detection still needs to continue to improve. For the depth measurement of liquid media and the distance measurement of underwater objects, the sounding hammer or microwave method is generally used for measurement and calculation in lakes with little water surface disturbance. The data obtained are relatively accurate due to little interference from environmental facto...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01B11/24
CPCG01N21/1702G01B11/24Y02A90/30
Inventor 赵扬张鹏辉李鹏周志权李迎春陈铖
Owner HARBIN INST OF TECH AT WEIHAI
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