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Proceedings Paper

Light-absorption-induced heating causes altered surface reflectance of an oblique laser probe beam to achieve high signal-to-noise in a laser absorption spectrometer prism device
Author(s): Marcos T. T. Pacheco; Wilfredo Irrazabal Urruchi
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Paper Abstract

We describe an improved measurement of tissue absorption of light by using a mirage effect due to the thermal gradient at the tissue surface. The laser beam enters a prism where internal reflection is highly dependent on the incident angle. The system is calibrated using an acoustic-optical cell. Finally, we discuss design of a compact system which can produce an electrical signal related directly with the sample optical radiation absorption.

Paper Details

Date Published: 7 August 1992
PDF: 8 pages
Proc. SPIE 1646, Laser-Tissue Interaction III, (7 August 1992); doi: 10.1117/12.137486
Show Author Affiliations
Marcos T. T. Pacheco, Fundacao Valeparaibana de Ensino (Brazil)
Wilfredo Irrazabal Urruchi, Fundacao Valeparaibana de Ensino (Brazil)


Published in SPIE Proceedings Vol. 1646:
Laser-Tissue Interaction III
Steven L. Jacques, Editor(s)

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