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Proceedings Paper

Application Of A Microcomputer To A Polariscope Using A Rotating Polariser And One Or Two Wavelengths
Author(s): Andre Robert; Jean Richard Garcia; Jean Royer
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Paper Abstract

During the last few decades the authors have presented new kinds of polariscope referen-ced from l to 5. However in the described apparatus the electrical signal emitted by the photomultiplier tube was processed by an analog method. So we were forced to use a high speed of rotation for the polariser because of the electrical filters and it was impossible to coincide the incident laser beam with the mechanical axis of rotation of the polariser. This time we use a microcomputer and by an appropriate sampling of the signal and a suitable processing we are able to determine the deviator of the stress tensor at the studied point in the model when the Maxwell- Neumann Laws are valid. Moreover we can use a small speed of rotation for the rotating polariser and we can easely make the mechanical and optical axis coincide. In effect we determine the direction of the fast axis of the birefringent medium and also the optical phase difference. When the latter is more than π/2, it can be easier to use two wavelengths.

Paper Details

Date Published: 17 February 1987
PDF: 5 pages
Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941658
Show Author Affiliations
Andre Robert, Service Technique des Constructions et Armes Navales (France)
Jean Richard Garcia, Service Technique des Constructions et Armes Navales (France)
Jean Royer, Ecole Nationale Superieure de Mecanique (France)

Published in SPIE Proceedings Vol. 0814:
Photomechanics and Speckle Metrology
Fu-Pen Chiang, Editor(s)

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