The Phase Doppler Method is based upon the principles of light scattering interferometry. Measurements are made using the same optical probe volume as for LDV . Scattered light from a particle moving through the probe volume is picked up by a receiving lens strategically located at an off-axis collection angle. This light is split and a portion is projected onto several detectors. Each detector produces a Doppler burst signal with a frequency proportional to the particle velocity. The phase shift between the Doppler burst signals from the different detectors is proportional to the size of the spherical particles.
The Phase Doppler method requires no calibration because the measured particle size and velocity are dependent only on the laser wavelength and optical configuration. PDPA measurements are not based on light intensity, and consequently are not subject to errors from beam attenuation or deflection which occur in dense particle and combustion environments.
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