Phase Doppler Particle Analyzer (PDPA)

The Phase Doppler Particle Analyzer (PDPA, see Figure 1) is procured in 2008 at Department of Aerospace Engineering with financial contribution from Department of Science and Technology under FIST scheme.

Unique features:

The Phase Doppler Method is based upon the principles of laser induced light scattering interferometry, (see Figure 2). Measurements are made at a small, non-intrusive optical probe volume defined by the intersection of two laser beams (see Figure 3). As a particle passes through the probe volume, it scatters light from the beams into a multi-detector receiving probe, strategically located at an

Off-axis collection angle. The phase shift between the Doppler burst signals from different detectors is proportional to the size of the spherical particles. PDPA system electronics provide accurate and reliable flow velocity and particle size data from all measurement situations - from simple flows to high speed and low SNR situations. Figure 4 presents typical flow velocity histogram.


Department of Aerospace Engineering,
IIT Kanpur


Prof. A Kushari

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