Study Of Optical System To Submarine Fiber Optics Hydrophone Sonar

Fiber optics underwater sonar plays an irreplaceable role in the field sub-water,since possessed features such as high dectection sensitivity,large dynamicrange.high stability,high temperature,corrosion resistance,smallsize,light weight,long transmission distance,and owns strength on constituting large area and huge array by utilizing optical fiber sensing multiplexing technique.however,the development of fiber optics underwater hydrophone apparently fell behind a piezoelectric one,as a consequence the application confronted great limit.at recent,the fiber optics underwater hydrophone is still in theory and stage of laboratory,difficulties were faced to ob tained fiber optics underwater hydrophone with stability an detections sensitivitys.This paper aim to study the optical system of fiber optics underwater hydrophone. Further, the principle of fiber optic interferometric hydrophone sensor and fiber Bragg grating hydrophone was analyzed and studied separately hereunder. And at the meantime, an introduction was made referring to the key technique of fiber optics underwater hydrophone.In the paper, three experimental systems of fiber optics underwater hydrophone sensor were designed and constructed separately, including Fox-Smith interferometric fiber optics hydrophone sensor system based on 3x3 coupler, matching the fiber FBG sensor system demodulation of Fiber Bragg Grating Hydrophone and non-equilibrium M-Z fiber FBG gratings sensor system demodulation of optical fiber hydrophone. Disturbance experiment in water was constructed utilizing the three above experiment respectively, then analysis were made comparing the observations of the experiment. finally, an optical sensing demodulation system was choose suitable the experimental system in this paper.