基于激光测振技术的低频水声换能器辐射声源级测量  

Measurement of Source Level of Low-frequency Hydroacoustic Transducers Based on Laser Vibrometry

作　　者：王文侠 强成虎 王敏[1,2] 杨平 艾华[3] 王珂 何龙标 WANG Wenxia;QIANG Chenghu;WANG Min;YANG Ping;AI Hua;WANG Ke;HE Longbiao(National Institute of Metrology,Beijing 100029,China;Innovation Center for Advanced Traceability Technology,Beijing 102200,China;P.O.Box 7220,Beijing 100072,China)

机构地区：[1]中国计量科学研究院,北京100029 [2]先进溯源技术创新中心,北京102200 [3]北京市7220信箱,北京100072

出　　处：《计量学报》2025年第2期240-246,共7页Acta Metrologica Sinica

基　　金：国家重点研发计划(2022YFF0607503);国家自然科学基金(51805506);中央科研院所基本科研业务费项目(AKYTC1601,AKYCX2316)。

摘　　要：针对低频水声换能器辐射声源级测量依赖大范围自由场水域、实施成本高等问题,提出了基于激光扫描测振的声源级测量方法。阐述了激光外差干涉振速测量原理和基于瑞利积分的远场声压推算方法;搭建了换能器表面振速扫描测量装置并开展实验,提取到低频换能器表面的复杂振动模态分布;由表面振速推算远场声压与湖试声源级测量结果相比较,在100 Hz和5 kHz频率处所测量声源级差异分别为-2.2 dB和0.9 dB,其结果基本吻合,验证了该方法的有效性。Aiming at the problems that the measurement of the radiation source level of low-frequency underwater acoustic transducers relies on large-scale free-field water areas and has high implementation costs,a source level measurement method based on scanning laser vibrometry is proposed.The principle of vibration velocity measurement using heterodyne interferometry and the far-field sound pressure calculation method based on the Rayleigh integral are elaborated.A scanning measurement device for the surface vibration velocity of the transducer is set up and and complex vibration modes on the transducer surface are observed in the experiments.The far-field sound pressure is deduced from the surface vibration and compared with results in the free-field lake test.The differences in the measured source levels at frequencies of 100 Hz and 5 kHz are-2.2 dB and 0.9 dB respectively,and the results are basically consistent,verifying the effectiveness of this method.

关 键 词：声学计量 低频水声换能器 声源级测量 激光扫描测振 远场声压 

分 类 号：TB95[一般工业技术—计量学]