The vibration velocity gradient hydrophone has the disadvantages of low sensitivity and narrow frequency band,which limits its application in engineering.In order to solve those problems,based on the principle of electrochemical energy exchange,an electrochemical energy exchange sensor is designed by using electrode micromachining technology,and a vibration velocity gradient hydrophone with higher sensitivity and lower frequency is fabricated.The designed electrochemical sensor has a vibration sensitivity of 2500 V/(m/s),which is 19 dB higher than that of the moving coil sensor.The operating frequency band is extended from 20 Hz～200 Hz to 5 Hz～400 Hz,indicating that it has higher sensitivity and wider operating frequency band.The vibration velocity gradient hydrophone is calibrated within the frequency range of 100 Hz to 400 Hz.The results demonstrate that both the sensitivity of the pure partial derivative channel in the x and y directions,as well as the sensitivity of the mixed partial derivative channel,adhere to a growth rate of 6 dB per frequency range while exhibiting dipole directivity and quadrupole directivity respectively.The measured values of sensitivity and directivity of pure and mixed partial derivative channels are in agreement with the theoretical values.
NETL
NSTL
维普
万方数据
