Interferogram Analysis By Means Of A Photodiode Array

Giovanni M. Carlomagno; Armando Rapillo

doi:10.1117/12.952369

16 July 1986 Interferogram Analysis By Means Of A Photodiode Array

Giovanni M. Carlomagno, Armando Rapillo

Proceedings Volume 0599, Optics in Engineering Measurement; (1986) https://doi.org/10.1117/12.952369
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

Objective of this work was to realize and test a digitizer which locates precisely and rapidly, the fringe centers of an interferogram so as to perform their evaluation procedure automatically by means of a microcomputer. The adopted opto-electronic sensing device is a linear array of 1024 bar-shaped (15μmx26μm) silicon photodiodes with center-to-center spacing of 25μm. A stepping motor can move the array board in order to investigate the whole interferometric image. Scanning time is about 10ms/line. Application of the system to a Wollaston prism interferometer, in order to measure concentration profiles in a mass diffusion process of a binary gas mixture, proved the ability of the digitizer to accurately interpret interferograms. The performance and the potentiality of the system are analyzed and discussed.

Citation Download Citation

Giovanni M. Carlomagno and Armando Rapillo "Interferogram Analysis By Means Of A Photodiode Array", Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); https://doi.org/10.1117/12.952369

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