An on-line calibration hydrophone with electrostatic actuator
An on-line calibration hydrophone with electrostatic actuator作者机构：Key Laboratory of Noise and Vibration Research Institute of AcousticsChinese Academy of Sciences School of Automation Beijing University of Posts and Telecommunications
出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))
年 卷 期：2016年第59卷第6期
页 面：240-247页
核心收录：
学科分类：082403[工学-水声工程] 08[工学] 0824[工学-船舶与海洋工程]
主 题：underwater measurement hydrophone on-line sensitivity calibration electrostatic actuator uncertainty
摘 要：On-line sensitivity calibration of hydrophones is of considerable significance for their practical application. An on-line method using an electrostatic actuator is proposed in this paper for a radially polarized cylindrical piezoelectric hydrophone. The theory of this calibration method is analyzed. A calibration structure with an electrostatic actuator is designed, and is integrated with the hydrophone sensing element. The sensitivity and frequency characteristics of the electrostatic actuator are measured experimentally. The sensitivity of the hydrophone is calibrated and compared with its free-field sensitivity. Uncertainty analysis shows that the expanded uncertainty of the proposed calibration method is about 1.1 d B at a confidence probability of 95%,which meets the uncertainty requirements for hydrophone sensitivity calibration.
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