变压条件下的耦合腔互易法测量灵敏度补偿分析  

Sensitivity Compensation Analysis of Coupled Cavity Reciprocity Method Under Variable Voltage Conditions

作　　者：王明威 王月兵[1] 赵鹏[1] WANG Mingwei;WANG Yuebing;ZHAO Peng(College of Metrology Measurement and Instrument,China Jiliang University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]中国计量大学计量测试与仪器学院,浙江杭州310018

出　　处：《计量学报》2025年第3期405-411,共7页Acta Metrologica Sinica

基　　金：国家重点研发计划(2022YFF0607505)。

摘　　要：针对变压条件下耦合腔内的低频互易校准问题,通过理论计算、Comsol声场仿真以及实验结合的方式,探求腔内在改变压力情况下对低频校准的影响。以理论分析耦合腔低频校准的互易原理和腔内声场特性,针对互易常数对校准公式进行推导,并通过Comsol仿真展示腔内换能器的分布结构对原液腔状态下的声场造成的影响,以声场分布做修正因子进行计算,对耦合腔低频互易校准公式进行补偿。仿真证明,腔内换能器的位置变化会影响校准结果,频率升高更加影响腔内声场分布。对测量的互易常数添加1~1100 Hz频段的修正因子,通过腔内常压至4 MPa的变压实验,与仿真结合验证耦合腔修正因子的优化方案的实验结果表明:使用修正因子(位形系数)校准灵敏度最大差值1.0 dB,最大标准偏差0.29 dB。To address the low-frequency reciprocity calibration in coupled cavities under variable pressure conditions,the influence of changing pressure on the low-frequency calibration in cavities is explored through a combination of theoretical calculations,Comsol acoustic field simulations,and experiments.The reciprocal principle and the acoustic field characteristics in the coupled cavity at low frequencies are analyzed theoretically.The calibration formula is derived based on the reciprocal constant.The influence of the distribution structure of the transducers in the cavity on the acoustic field in the original liquid cavity state is demonstrated through Comsol simulation.The compensation of the low-frequency reciprocal calibration formula of the coupled cavity is carried out by using the acoustic field distribution as the correction factor for calculation,and the results show that the change of the transducer's position in the cavity affects the calibration theoretical system,and the increase of frequency affects the low-frequency calibration of the cavity.The results show that the change of the position of the transducer in the cavity will affect the calibration theoretical system,and the frequency increase will affect the sound field distribution in the cavity even more,and the correction factor of 1~1100 Hz band is added to the measured reciprocity constant,and the optimization scheme of the correction factor of the coupling cavity is explored by the variable pressure experiment of the cavity from atmospheric pressure to 4 MPa,combined with the simulation,and the experimental results show that the maximum difference in the sensitivity of calibration using the correction factor(bit-shape coefficient)is 1.0 dB,and the average standard deviation is 0.29 dB.

关 键 词：声学计量 耦合腔互易法 互易校准 变压 位形系数 

分 类 号：TB95[一般工业技术—计量学]