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Published on: June 24, 2013
Push-pull analysis of photonic Doppler velocimetry measurements
1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. dhdolan@sandia.gov
Abstract:
A robust analysis method is presented for multiple-phase heterodyne velocimetry measurements. By combining information from three phase-shifted signals, it is possible to eliminate coherent intensity variations and incoherent light from the measurement. The three data signals are reduced to a pair of quadrature signals, allowing unambiguous calculation of target displacement. The analysis relies on a minimum number of adjustable parameters, and these parameters can be precisely determined from simple interferometer characterization.
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