| Wave measurement based on light refraction |
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| 作者姓名： | SUN Hequan QIU Dahong SHEN Yongming WANG Yongxue |
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| 作者单位： | StateKeyLaboratoryofCoastalandOffshoreEngineering,DalianUniversityofTechnology,Dalian116023,China |
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| 摘 要： | Some authors have developed a few methods of measuring wave slopes based on light refraction, including the measurement method via the distribution of light intensity or color under water. A new method based on light refraction is specified for the measurement of wave surface elevation in wave flume via imaging technology. A plane painted with black and white stripes is put on the flume floor as an indication plane, which can be arranged easily and cheaply. Compared with the previous methods, the present method is less sensitive to the noise and nonlinear effects of optical process, which can be taken as a digital method. The CCD camera is fixed above the flume with its optical axis arranged vertically to grab the images of stripes modulated by the wave surface. The modulated value can be calculated from the Hilbert transform, and then the wave surface elevation can be obtained. The algorithm and experimental procedure are specified in detail, and some experimental results are provided to show the validity of the present method.
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| 关 键 词： | 波浪测量法 折射光 希耳伯特变换 光学处理 |
| 收稿时间： | 2003/12/11 0:00:00 |
| 修稿时间： | 2004/1/20 0:00:00 |
Wave measurement based on light refraction |
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| SUN Hequan,QIU Dahong,SHEN Yongming,WANG Yongxue.Wave measurement based on light refraction[J].Acta Oceanologica Sinica,2004,23(2):359-366. |
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| Authors: | SUN Hequan QIU Dahong SHEN Yongming and WANG Yongxue |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China |
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| Abstract: | Some authors have developed a few methods of measuring wave slopes based on light refraction, including the measurement method via the distribution of light intensity or color under water. A new method based on light refraction is specified for the measurement of wave surface elevation in wave flume via imaging technology. A plane painted with black and white stripes is put on the flume floor as an indication plane, which can be arranged easily and cheaply. Compared with the previous methods, the present method is less sensitive to the noise and nonlinear effects of optical process, which can be taken as a digital method. The CCD camera is fixed above the flume with its optical axis arranged vertically to grab the images of stripes modulated by the wave surface. The modulated value can be calculated from the Hilbert transform, and then the wave surface elevation can be obtained. The algorithm and experimental procedure are specified in detail, and some experimental results are provided to show the validity of the present method. |
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| Keywords: | wave measurement light refraction Hilbert transform |
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