| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration sensor capable of more surely avoiding an insulation defect, and an underwater acoustic sensor with the same.SOLUTION: A vibration sensor 2 includes an electroacoustic transducer 10, and an electroacoustic transducer 20 having a reverse polarity to the electroacoustic transducer 10. The electroacoustic transducer 10 includes: an inner electrode 11 which is formed only on an inner peripheral surface between the inner peripheral surface and an outer peripheral surface of the electroacoustic transducer 10; and an outer electrode 12 which is formed only on the outer peripheral surface between the inner peripheral surface and the outer peripheral surface of the electroacoustic transducer 10. The electroacoustic transducer 20 includes: an inner electrode 21 which is formed only on an inner peripheral surface between the inner peripheral surface and an outer peripheral surface of the electroacoustic transducer 20; and an outer electrode 22 which is formed only on the outer peripheral surface between the inner peripheral surface and the outer peripheral surface of the electroacoustic transducer 20. A detection signal is extracted from a pair of the inner electrodes 11 and 21 and a pair of the outer electrodes 12 and 22 are grounded.SELECTED DRAWING: Figure 2 |
