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激光多普勒流速仪的干涉条纹理论分析及测量

Theory Analysis and Measurement for Interference Fringes of Laser Doppler Velocimeter

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摘要

激光多普勒流速仪(LDV)具有准确度高、非接触测量、动态响应快等优点, 在流速测量中得到了广泛应用。条纹的非一致性是影响激光多普勒流速仪测量精度的重要因素, 因此精确获知测量体中干涉条纹间距及梯度分布情况, 是激光多普勒流速仪准确测量流速的前提。对激光多普勒流速仪测量体中的干涉条纹间距及梯度分布进行了理论分析, 揭示了高斯光束固有传播特性与其测量体中干涉条纹分布之间的关系, 确定了影响干涉条纹分布的参数。使用光束分析仪分别获得绿光和紫光的束腰半径为114 μm和83 μm, 并确定了束腰的空间位置, 利用测得的相关参数量化了绿光和紫光测量体中任意位置的干涉条纹间距及梯度分布, 绿光和紫光测量体中归一化后的条纹梯度最大分别可达0.46%和0.60%。通过与转盘装置所测得的绿光和紫光干涉条纹间距结果进行比较, 对干涉条纹分布的理论分析及测量结果进行了验证, 最大相对误差分别为0.87%和0.78%。

Abstract

Laser Doppler velocimeter (LDV) is widely applied in the measurement of fluid velocity with the advantages of high accuracy, non-contact measurement and quick dynamic response. The fringe nonuniformity is a key factor to influence the measurement accuracy of LDV. To accurately measure fluid velocity of LDV, the interference fringe spacing and the gradient distribution in the measuring volume have to be determined exactly. The interference fringe spacing and the gradient distribution of LDV in the measuring volume are analyzed in theory. The relationship between the Gaussian beam propagation characteristics and its interference fringe distribution are revealed. The parameters influencing the interference fringe distribution are determined. The beam waist radii of the green beam and purple beam are 114 μm and 83 μm respectively, which are obtained by beam profiler. Meanwhile, the spatial location of the beam waist is determined. The interference fringe spacing and gradient distribution of green and purple beams in the measuring volume at any locations are quantified by using measured parameters. In the measuring volume of green and purple beams, normalized fringe gradient maximums can reach 0.46% and 0.60%, respectively. The interference fringe spacing results of green and purple beams measured by spinning-disk system are compared, and theoretical analysis and measuring results of the interference fringes distribution are verified. The maximum relative errors are 0.87% and 0.78%, respectively.

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中图分类号:TH815

DOI:10.3788/cjl201744.0804001

所属栏目:测量与计量

基金项目:国家自然科学基金(51575502)

收稿日期:2017-03-20

修改稿日期:2017-03-30

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作者单位    点击查看

刘子君:中国计量大学计量测试工程学院, 浙江 杭州 310018中国计量科学研究院, 北京 100013
崔骊水:中国计量科学研究院, 北京 100013北京理工大学, 北京 100081
谢代梁:中国计量大学计量测试工程学院, 浙江 杭州 310018

联系人作者:刘子君(869522024@qq.com)

备注:刘子君(1993-), 女, 硕士研究生, 主要从事激光多普勒流速仪校准方面的研究。

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引用该论文

Liu Zijun,Cui Lishui,Xie Dailiang. Theory Analysis and Measurement for Interference Fringes of Laser Doppler Velocimeter[J]. Chinese Journal of Lasers, 2017, 44(8): 0804001

刘子君,崔骊水,谢代梁. 激光多普勒流速仪的干涉条纹理论分析及测量[J]. 中国激光, 2017, 44(8): 0804001

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