Push-pull analysis of photonic Doppler velocimetry measurements.
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.
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. dhdolan@sandia.gov
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D000465:Algorithms; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D017078:Laser-Doppler Flowmetry / Q000295:instrumentation* / Q000379:methods*; D008962:Models, Theoretical; D017785:Photons; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity