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A Wollaston prism interferometer implemented with a digitizer

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Abstract

Objective of this work was to implement a Wollaston prism interferometer with a digitizer so as to perform the evaluation procedure of interferograms automatically by means of a microcomputer. The adopted opto-electronic sensing device is a linear array of 1,024 bar-shaped (15 μm × 26 μm) silicon photodiodes with center-to-center spacing 25 μm. A stepping motor can move the array board in order to investigate the whole interferometric image. Scanning time is about 10 ms/line. Application of the system to measurements of concentration profiles in some mass diffusion processes of a binary gas mixture proves the ability of the digitizer to accurately measure gas densities. The performance and the potentiality of the sensor are analyzed and discussed.

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Authors and Affiliations

  1. Institute of Gasdynamics, University of Naples, I-80125, Napoli, Italy

    G. M. Carlomagno & A. Rapillo

Authors
  1. G. M. Carlomagno
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  2. A. Rapillo
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Carlomagno, G.M., Rapillo, A. A Wollaston prism interferometer implemented with a digitizer. Experiments in Fluids 4, 332–336 (1986). https://doi.org/10.1007/BF00266298

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  • DOI: https://doi.org/10.1007/BF00266298

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