Quantachrome Instrument for physisorption and chemisorption
"Centre for Environmental Science & Engineering"
 Indian Institute of Technology, Kanpur
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Prof. S.N Tripathi

CESE 206, FB 306,

Phone: +91-512-259-6224
Email : snt@iitk.ac.in

Phase Doppler Method (PDPA)
The Phase Doppler Method is based upon the principles of light scattering interferometry. Measurements are made at a small, non-intrusive optical probe volume defined by the intersection of two laser beams. 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. The velocity measured is directly proportional to doppler frequency. Velocity upto 1600 m/s can be detected.
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