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Proceedings Paper

Interferogram Analysis By Means Of A Photodiode Array
Author(s): Giovanni M. Carlomagno; Armando Rapillo
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Paper 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.

Paper Details

Date Published: 16 July 1986
PDF: 6 pages
Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); doi: 10.1117/12.952369
Show Author Affiliations
Giovanni M. Carlomagno, University of Naples (Italy)
Armando Rapillo, University of Naples (Italy)


Published in SPIE Proceedings Vol. 0599:
Optics in Engineering Measurement
William F. Fagan, Editor(s)

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