OPTICAL AND ELECTRONIC DESIGN OF A CALIBRATED MULTICHANNEL ELECTRONICINTERFEROMETER FOR QUANTITATIVE FLOW VISUALIZATION

Calibrated multichannel electronic interferometry is an electro-optic technique for performing phase shifting of transient phenomena. The de sign of an improved system for calibrated multichannel electronic inte rferometry is discussed. This includes a computational method for alig nment of three phase-shifted interferograms and determination of the p ixel correspondence. During calibration the phase, modulation, and bia s of the optical system are determined. These data are stored electron ically and used to compensate for errors associated with the path diff erences in the interferometer, the separation of the phase-shifted int erferograms, and the measurement of the phase shift.