| 光电非接触式表面流速测量 |
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| 引用本文： | 吴俊,丁甡奇,余葵,李晓飚. 光电非接触式表面流速测量[J]. 光学精密工程, 2010, 18(2) |
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| 作者姓名： | 吴俊 丁甡奇 余葵 李晓飚 |
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| 作者单位： | 重庆交通大学,省部共建水利水运工程教育部重点实验室,重庆,400074;重庆交通大学,西南水运工程科学研究所,重庆,400016;重庆交通大学,西南水运工程科学研究所,重庆,400016 |
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| 基金项目： | 重庆交通大学省部共建水利水运工程教育部重点实验室开放基金资助项目(No.SLK2007A01) |
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| 摘 要： | 针对水工物理模型试验中尚无简单易行的表面流速测量方法,提出了一种新型光电非接触式表面流速直接测量法。在对光束入射水体后散射光强度公式进行推导的基础上,根据水体浅层泥沙浓度的统计继承效应,得出了经上下游浅层泥沙调制的散射光强成相关特性的结论。根据上下游散射光的相关特性,推导了流速测量公式,并分析了上下游测量间距、水流流速、采样率对测量结果的影响。搭建了实验系统,在6种不同标定流速下,分析了不同含沙量对测量精度的影响。实验结果表明,在0～50kg/m36种不同含沙量情况下,实测流速与标定流速的一致性均较好,但水体在10～50kg/m3适量含沙情况下,测量精度较不含沙情况有所提高,测量绝对误差均小于0.1m/s,相对误差能控制在8%以内。
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| 关 键 词： | 水工物理模型 浅层泥沙 继承效应 非接触测量 表面流速测量 |
Non-contact measurement of surface flow velocity using photoelectric method |
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| WU Jun,DING Shen-qi,YU Kui,LI Xiao-biao. Non-contact measurement of surface flow velocity using photoelectric method[J]. Optics and Precision Engineering, 2010, 18(2) |
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| Authors: | WU Jun DING Shen-qi YU Kui LI Xiao-biao |
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| Affiliation: | 1.Key Laboratory for Hydraulic and Water Transport Engineering;Ministry of Education;Chongqing Jiaotong University;Chongqing 400074;China;2.Southwest Water Transport Research Department;Chongqing 400016;China |
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| Abstract: | Aimming at the technological actuality of surface flow velocity measurement,a novel noncontact photoelectric measuring method for surface flow velocity is proposed. By deducing scattered light intensity formulae,it is concluded that scattered light intensities modulated by both up and down stream shallow sediments have cross-correlated characteristics based on sediment succession effect in shallow water.A formula for flow velocity measurement is derived and the effects of the measuring distance between up a... |
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| Keywords: | hydraulic physical model shallow sediment succession effect non-contact measurement surface flow velocity measurement |
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