Design and manufacture of combined co-vibrating vector hydrophones

A combined co-vibrating vector hydrophones prototype was designed and manufactured based on the actual demand of engineering, which has a dimension of Φ54×72mm, taking on an irregular shape of a cylinder with two half ball caps on each end of the cylinder, with the working frequency band 20 ~ 5000Hz, and the average density is 1200kg/m³. Its performance was measured in both standing wave calibrator and anechoic tank in National Defence Underwater Acoustics Calibration Laboratory. The pressure sensitivities of vector channels is -185.3dB (500Hz, 0dB ref 1V/μPa), meeting a sensitivity increments of 6dB per octave. Pressure sensitivity of pressure channel is -192.7dB (0dB ref 1V/μPa), and vector channels have good direction performance of cosine when pressure channel with direction performance of omnidirectional.