面向粒子图像测速仪的分参数校准方法  

Fractional Parameters Calibration for Particle Image Velocimeter

作　　者：单杰 黄震威 崔骊水[2] 谢代梁 王毅[3] 张淑婷 高山 张育闻 钱振宇 SHAN Jie;HUANG Zhenwei;CUI Lishui;XIE Dailiang;WANG Yi;ZHANG Shuting;GAO Shan;ZHANG Yuwen;QIAN Zhenyu(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029;Beijing Great Wall Measurement and Test Technology Research Institute,AVIC,Beijing 100095)

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 [3]中国航空工业集团公司北京长城计量测试技术研究所,北京100095

出　　处：《计量学报》2024年第9期1324-1330,共7页Acta Metrologica Sinica

基　　金：国家重点研发项目(2022YFF0610805)。

摘　　要：研究了粒子图像测速(particle image velocimetry,PIV)测量过程中粒子位移和跨帧时间2个关键分参数的校准方法。设计了用于相机标定的标定圆盘,确定了相机获得图像与实物的比例关系。与标尺相比较,设计的标定圆盘可实现粒子位移的校准。采用可溯源的高准确度计时器校准了PIV同步器在不同速度点下脉冲信号的时间间隔,得到PIV实际跨帧时间。评估了PIV分参数方法校准结果的不确定度水平。结果表明:速度100 m/s内的PIV校准相对误差最大为0.08%,其相对误差的不确定度为0.01%。The calibration methods of particle displacement and cross-frame time during particle image velocimetry(PIV)measurement are studied.The geometric size standard of disc is designed for camera calibration,the proportional relationship between the image obtained by camera and the object is determined,and the particle displacement calibration is realized by comparing with the ruler under the same experimental condition.A traceable timer is used to calibrate the time interval of PIV synchronizer pulse signals at different speed points.The cross-frame time correction coefficient is the ratio of the actual value to the initial value.As the result the PIV calibration coefficient is determined by the particle displacement correction coefficient and the cross-frame time correction coefficient.The uncertainty of PIV calibration results based on the sub-parameter method is evaluated.The results indicate that:at the theoretical speed point of 100 m/s,the maximum relative error is 0.08%,and the uncertainty of the relative error is 0.01%.

关 键 词：流量测量 粒子图像测速 校准方法 分参数 不确定度 

分 类 号：TB937[一般工业技术—计量学]