Shen Xiong, Liao Husheng. Laser-Doppler velocimeter using the technique of optical frequency shift[J]. Chinese Journal of Lasers, 1982, 9(10): 645
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The principles and functions of frequency shift are discussed. A LDV system using an acousto-optic modulator as its optical frequency shift device is presented. The measurements of the highly turbulent recirculating flow in a two-dimensional duct with a single step expansion were successfully performed by employing the LDV system.