Application Of A Microcomputer To A Polariscope Using A Rotating Polariser And One Or Two Wavelengths

Andre Robert; Jean Richard Garcia; Jean Royer

doi:10.1117/12.941658

17 February 1987 Application Of A Microcomputer To A Polariscope Using A Rotating Polariser And One Or Two Wavelengths

Andre Robert, Jean Richard Garcia, Jean Royer

Proceedings Volume 0814, Photomechanics and Speckle Metrology; (1987) https://doi.org/10.1117/12.941658
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

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.

Citation Download Citation

Andre Robert, Jean Richard Garcia, and Jean Royer "Application Of A Microcomputer To A Polariscope Using A Rotating Polariser And One Or Two Wavelengths", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); https://doi.org/10.1117/12.941658

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KEYWORDS

Polarizers

Signal processing

Wave plates

Speckle metrology

Analog electronics

Quartz

Acquisition tracking and pointing

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