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采用双光束干涉条纹模型,用光散射理论分析了激光多普勒测速中球形散射粒子的大小对散射光信噪比的影响。用数值解法求得了信噪比随散射粒子半径变化的曲线。仅从穿过测控区时光信号的信噪比这一方面考虑,结论是:粒子半径的取值不应大于干涉条纹宽度的0.35倍。
Using double-beam interference fringe model, the influence of the size of spherical scattering particles on the S / N ratio of scattered light is analyzed by using light scattering theory. The curve of signal to noise ratio with scattering particle radius is obtained by numerical solution. Considering only the signal-to-noise ratio of the optical signal when passing through the measurement and control zone, the conclusion is that the particle radius should not be greater than 0.35 times the width of the interference fringes.