2 February 2009 Two-flash method using red and green lasers in a velocity measuring system
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In order to acquire sequence images in PIV measurement system of continuous clashing flow of water, two laser flashers, the red one and the green one, are used in PIV measurement system. After the digital camera is triggered, the two flashers flash in a short interval during the exposure period. The red light and the green light illuminate the same region so that the image records the movements of tracing particles in two colors. Using digital image process technology, two images, the red one and the green one, can be obtained from the original image. Based on the two images, the flow field parameters can be calculated. The method possesses predominant advantages: high speed field can be measured using an ordinary camera and the two images have determinate time labels, so the moving direction of the particles can be determined easily. The main steps of the method include the transition from Bayer matrix to RGB matrix, the pretreatment of the images, the analyzation of the velocity and the arrangement of the results.
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Zhongke Li, Zhongke Li, Fubao Li, Fubao Li, Kaiduan Yue, Kaiduan Yue, Yaxing Yi, Yaxing Yi, } "Two-flash method using red and green lasers in a velocity measuring system", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571H (2 February 2009); doi: 10.1117/12.811834; https://doi.org/10.1117/12.811834


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