衍射效应修正骨密度模体声衰减测量方法  

Ultrasonic attenuation measurement method of bone density mold based on modified diffraction effect

作　　者：曹乐平 邢广振 王敏[2] 郑慧峰 CAO Leping;XING Guangzhen;WANG Min;ZHENG Huifeng(College of Metrology&Measurement Engineering,China Jiliang University,Hangzhou 310018,China;National Institute of Metrology,China,Beijing 100029,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]中国计量科学研究院,北京100029

出　　处：《中国测试》2024年第10期93-98,135,共7页China Measurement & Test

基　　金：国家自然科学基金(11904347);国家重点研发计划(2022YFC3005004);国家市场监管总局科技计划项目(2020MK150);中央科研院所基本科研业务费项目(AKYZD2004-2)。

摘　　要：针对超声骨密度模体的声衰减系数测量不够精确的问题,研究基于衍射效应修正的骨密度模体声衰减测量方法,建立一套基于插入取代法的超声骨密度模体声衰减实验系统。在研究骨密度模体插入前后的衍射效应的基础上,分析骨模样品界面的声透射情况对衍射效应进行补偿,改进衍射效应理论模型以实现声衰减系数的精确测量。在此基础上,对不同水温下的骨模样品开展声衰减测量研究并做不确定度评定,声衰减系数测量的相对不确定度为3.89%(k=2),结果表明该理论模型对声衰减有较好的补偿作用,且测量系统具有可靠性,研究成果可为后续开展超声骨密度模体检测研究提供经验。Aiming at the problem that the measurement of acoustic attenuation coefficient of ultrasonic bone density phantom was not accurate enough,a measurement method of acoustic attenuation of ultrasonic bone density phantom based on diffraction effect correction was studied,and an experimental system of acoustic attenuation of ultrasonic bone density phantom based on insertion replacement method was established.On the basis of studying the diffraction effect before and after the bone density phantom was inserted,the diffraction effect was compensated by analyzing the acoustic transmission at the interface of the bone phantom sample,and the theoretical model of the diffraction effect was improved to achieve accurate measurement of the acoustic attenuation coefficient.On this basis,sound attenuation measurement research and uncertainty evaluation were carried out for bone model samples at different water temperatures.The relative uncertainty of sound attenuation coefficient measurement was 3.89%(k=2).The results showed that the theoretical model had a good compensation effect on sound attenuation,and the measurement system was reliable.The research results could provide experience for the follow-up research on ultrasonic bone density phantom detection.

关 键 词：计量学 声衰减 衍射效应 不确定度 

分 类 号：TB9[一般工业技术—计量学] TB551[机械工程—测试计量技术及仪器]