计量学报2025，Vol.46Issue(3)：405-411,7.DOI:10.3969/j.issn.1000-1158.2025.03.14
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
摘要
Abstract
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Key words
acoustic metrology/coupling cavity/reciprocity method calibration/variable pressure/form factor分类
通用工业技术引用本文复制引用
王明威,王月兵,赵鹏..变压条件下的耦合腔互易法测量灵敏度补偿分析[J].计量学报,2025,46(3):405-411,7.基金项目
国家重点研发计划(2022YFF0607505) （2022YFF0607505）
