A Wollaston prism interferometer implemented with a digitizer
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.
- Publication:
-
Experiments in Fluids
- Pub Date:
- November 1986
- DOI:
- Bibcode:
- 1986ExFl....4..332C
- Keywords:
-
- Analog To Digital Converters;
- Computer Techniques;
- Flow Measurement;
- Interferometers;
- Diffraction Patterns;
- Helium-Neon Lasers;
- Lenses;
- Photodiodes;
- Plumes;
- Wall Flow;
- Instrumentation and Photography;
- Silicon;
- Diffusion Process;
- Concentration Profile;
- Linear Array;
- Evaluation Procedure