Phase maps based on the Lorenz-Mie theory to optimize phase Doppler particle-sizing systems.
A phase Doppler particle-sizing system, whose main part is a two-beam laser interferometer, can be used to determine the size of scattering particles by measuring the phase differences between two signals detected by two detectors located in a scattered field. Important parameters of the receiving system to be selected include the off-axis angle, the elevation angle, and parameters of receiving apertures. A method is described for theoretically optimizing such measuring systems with the aid of so-called phase maps based on the Lorenz-Mie scattering theory. This method has been systematically studied and applied for cases of water droplets, metal particles, and droplets of weakly absorbing fluid. The results have shown that phase maps are direct, simple, and unique to interpret, and they provide an effective tool in setting up measuring systems.
Jiang
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