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17 June 2009 Sheath flow stability controlling research in dynamic individual particles scattering measurement
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Laser light scattering detection based on sheath flow technique are well established and routinely used in a variety of fields, ranging from ecology to medicine. Normally the width of sheath flow chamber is assumed as a constant, but the inaccuracy during manufacture changes the inter structure of sheath flow chamber. So the sheath flow width deviates its designed value. In our research, a novel method is applied to research sheath flow stability. The structure of sheath flow chamber in different positions is firstly imaged by CCD camera. The values of sheath flow width in different positions can be gotten by image processing technologies. According to chamber width values in different positions, principle sheath width can be calculated to be compared with the measured values. Hence sheath flow stability in different time and different positions can be detected. By this novel method, the real width of sheath flow forming with specific velocity rate in different positions can be measured. So the best measurement site for dynamic individual particles scattering can be selected.
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Lu Zhang, Hong Zhao, Pengfei Zhang, Xiang Zhou, and Jinjun Li "Sheath flow stability controlling research in dynamic individual particles scattering measurement", Proc. SPIE 7389, Optical Measurement Systems for Industrial Inspection VI, 738928 (17 June 2009);

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