10〜500 kHz水听器的激光外差干涉法原级校准  

Primary calibration of hydrophones in the frequency range 10 to 500 kHz using a heterodyne interferometer

作　　者：王敏[1] 杨平[1] 何龙标[1] 冯秀娟[1] 邢广振 WANG Min;YANG Ping;HE Longbiao;FENG Xiujuan;XING Guangzhen(National Institute of Metrology,Beijing,100029)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《声学学报》2021年第4期614-622,共9页Acta Acustica

基　　金：国家自然科学基金项目(51805506,11904347)资助。

摘　　要：阐述了水听器在10〜500 kHz频率范围的激光外差干涉法原级校准的原理和测量装置„利用激光外差干涉系统非接触测量水中反光薄膜在声波调制下引起的多普勒频移,经过零点信号解调算法得到水质点振速,准确复现水下声压量值,之后将水听器置于水中测量点完成对其自由场电压灵敏度的原级校准。对各误差因素进行了分析,详细给出了系统测量不确定度的评定方法,在所测频段的不确定度为0.6 dB(k=2)。将激光外差干涉法水听器校准结果与自由场互易法结果进行了对比,在整个测量频率范围内结果等效,且前者不确定度更小。为建立新的水声计量基准和实现水声量值的扁平化传递奠定了基础。The principle and the measurement system of primary calibration of hydrophones in the frequency range 10 kHz to 500 kHz by laser heterodyne interferometry are presented in detail.A stable home-made heterodyne interferometer is established to measure the Doppler shift of a membrane induced by the propagating acoustic field.The acoustic particle velocity is then obtained by zero-crossing demodulation algorithm,and hence the acoustic pressure is reproduced accurately.Hydrophones are subsequently placed at exactly the same point in the acoustic field to be calibrated.Some measurement error sources are analyzed,and a detailed uncertainty budget is given.The expanded uncertainties in the frequency range of interest are shown to be 0.6 dB(k=2).The calibration results of laser heterodyne interferometry are compared to those derived through the free-field reciprocity method,and good agreements are observed.In addition,smaller measurement uncertainties are shown in the laser heterodyne interferometry technique.It is a good preparation to establish the next generation of primary standard and implement the reduction of the traceability chain of underwater acoustic.

关 键 词：多普勒频移 激光外差干涉 频率范围 水听器 自由场 测量频率 非接触测量 电压灵敏度 

分 类 号：TB565.1[交通运输工程—水声工程]