Comparative Research of Numerical Calculating and Simulating the Performance of a Fiber Optic Vector Hydrophone

To content acceleration sensitivity Ma and frequency response f need of an one-dimensional fiber optic inertial vector hydrophone, numerical calculating and finite element simulating approaches are proposed to research on. Respectively through the two measures, it is showed that there are some relationship curves among the two performances and the hydrophone structure parameters as Young's modulus E'A block quality M and radius R. Compared with numerical calculating and finite element simulating, the obtained relation curves are very similar for one structure parameter. In finally, the structure parameters is optimized, and it gets an excellent performance that diameter is less than 90mm, working frequency 0Hz-1000Hz, and acceleration sensitivity about 30dB. Meanwhile, a three-dimensional fiber optic inertial vector hydrophone is analyzed by the two approaches to get Ma 30dB and f higher than 4 kHz. It is of great significance for studying the sensing mechanism and designing the structure of a fiber optic vector hydrophone.