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计量学报  2023, Vol. 44 Issue (4): 591-597    DOI: 10.3969/j.issn.1000-1158.2023.04.15
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基于LDV测速算法的多普勒频率测量不确定度分析和评定
张育闻1,2,崔骊水2,谢代梁1,杨兆欣3
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.中国空气动力研究与发展中心 设备设计与测试技术研究所, 四川 绵阳 621000
Analysis and Evaluation on the Uncertainty of Doppler Frequency Measurement Based on LDV Velocity Measurement Algorithm
ZHANG Yu-wen1,2,CUI Li-shui2,XIE Dai-liang1,YANG Zhao-xin3
1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. Facility Design and Instrumentation Institute of China Aerodynamics Research and Development Center, Mianyang, Sichuan 621000, China
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摘要 为了明确激光多普勒测速仪(LDV)通过转盘装置校准的低速结果在高速的适用性,分析得到LDV测量流速的不确定度与测量体中的干涉条纹间距和多普勒频率的不确定度相关。由于干涉条纹间距与被测流速无关,则高、低流速测量结果不确定度间的可能差异由多普勒频率算法引入。用基于蒙特卡洛法(MCM)传播概率分布评定测量不确定度的方法分析在不同流速下多普勒频率算法引入的多普勒频率测量不确定度,发现在流速为0.1~340m/s时,由多普勒频率算法引入的多普勒频率相对不确定度均小于0.03%,且该相对不确定度在不同流速下基本保持不变。流速不同产生的多普勒频率不确定度差异对LDV测速结果的影响小于0.013%,验证了测速算法精度的适用范围。得到了LDV低速校准结果可以应用于高速测量的结论,解决了高流速测量的溯源问题。
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张育闻
崔骊水
谢代梁
杨兆欣
关键词 计量学激光多普勒测速仪不确定度多普勒频率高流速蒙特卡洛法混合基FFT    
Abstract:In order to clarify the applicability of the low-speed results of the laser Doppler velocimeter (LDV) calibrated by the spinning-disc facility, it is analyzed that the uncertainty of velocity depends on the uncertainty of both the interference fringe spacing in the measuring volume and Doppler frequency. As the Interference fringe spacing is independent of the fluid velocity the possible difference of uncertainty in between the high velocity and the low velocity is only related with the Doppler frequency algorithm at different velocity. The uncertainty of Doppler frequency caused by the algorithm at different velocity is analyzed with Monte Carlo method (MCM) for evaluation of measurement uncertainty. The result shows that the relative uncertainty of the Doppler frequency caused by the algorithm is less than 0.03% in the range of 0.1~340m/s.The obvious difference of uncertainty has not been found in the different points of velocity investigated. The budget resulting from Doppler frequency accuracy to the uncertainty of velocity measured is less than 0.013%. It is concluded that the calibration result at low velocity is also reasonable to be used at high velocity measurement.
Key wordsmetrology    LDV    uncertainty    Doppler frequency    high fluid velocity    Monte Carlo method    mixed-radix FFT
收稿日期: 2021-11-26      发布日期: 2023-04-18
PACS:  TB937  
基金资助:国家重点研发计划(2019YFF0216102)
通讯作者: 崔骊水(1979-),男,陕西榆林人,中国计量科学研究院副研究员,主要从事流速流量计量技术方面的研究。Email:cuils@nim.ac.cn     E-mail: cuils@nim.ac.cn
作者简介: 张育闻(1997-),男,浙江温州人,中国计量大学硕士研究生,研究方向为信号处理算法。Email:newuygnahz@outlook.com
引用本文:   
张育闻,崔骊水,谢代梁,杨兆欣. 基于LDV测速算法的多普勒频率测量不确定度分析和评定[J]. 计量学报, 2023, 44(4): 591-597.
ZHANG Yu-wen,CUI Li-shui,XIE Dai-liang,YANG Zhao-xin. Analysis and Evaluation on the Uncertainty of Doppler Frequency Measurement Based on LDV Velocity Measurement Algorithm. Acta Metrologica Sinica, 2023, 44(4): 591-597.
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