The phase-Doppler technique, allowing one to measure velocities and sizes of individual spherical particles in moving flows, is a very popular technique. Nevertheless, the bulkiness of the device and the need for accurate adjustments still impose restrictions in use in a large number of industrial situations. We present here a miniature phase-Doppler probe in which the emitting and collecting units are assembled in a compact way. The performance of the device is numerically and experimentally demonstrated.
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Bultynck et al. (1998) studied this question.
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