A MINIATURE MONOBLOCK BACKWARD PHASE-DOPPLER UNIT

The phase-Doppler technique, allowing one to measure velocities and si zes of individual spherical particles in moving flows, is a very popul ar technique. Nevertheless, the bulkiness of the device and the need f or accurate adjustments still impose restrictions in use in a large nu mber of industrial situations. We present here a miniature phase-Doppl er probe in which the emitting and collecting units are assembled in a compact way. The performance of the device is numerically and experim entally demonstrated.