Laser Coherent Remote Sensing Acoustic Technology Based On Doppler Shift

In recent years,exploration of ocean resources and underwater target detection have become research hotspots in various countries.Traditional sonar detection enables long-range detection,but lacks flexibility to meet large-scale detection.Blue-green laser detection enables wide-range detection,but the propagation distance is limited.Considering the better propagation characteristics of acoustic waves and light waves in water and air,remote sensing detection of photoacoustic has become the focus of research.In this paper,the laser coherent remote sensing acoustic technology based on Doppler shift is studied.The feasibility of the technique is verified by theory and experiment.The laser coherent remote sensing acoustic technology based on Doppler shift is to use the laser to illuminate the vibrating water surface excited by the underwater active acoustic source,and the reflected light generates Doppler shift and carries the acoustic source information.The reflected light interferes with the reference light,and undergoes a series of processes such as photoelectric conversion to restore the underwater acoustic signal characteristicsThe main work of this paper has the following points.Analyze underwater acoustic environment characteristics and Doppler effect principle.By deducing the mathematical model of laser coherent remote sensing acoustic technology and using software to carry out simulation experiments,the feasibility of the technology is verified theoretically.Analyze and discuss the overall structure of the laser remote sensing acoustic system,build the original laser light path,design the system related modules and test them.The experimental process of laser remote sensing acoustic system was designed,the underwater experimental platform was built,and the laser remote sensing acoustic signal was acquired.By analyzing and processing the signal,the relevant features are observed in different dimensions,and the experimental results are consistent with the underwater acoustic source characteristics.The feasibility of laser remote sensing acoustic technology is verified experimentally.This paper explores the feasibility of laser coherent remote sensing acoustic technology based on Doppler shift by theory and experiment,and designs related experimental systems,which provides a new idea for future research on underwater exploration.