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Proceedings Paper

Fiber optic liquid crystalline microsensor for temperature measurement in high magnetic field
Author(s): Andrzej W. Domanski; Stanislaw Kostrzewa
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Paper Abstract

In this paper, a fiber optic liquid crystalline (LC) microsensor for temperature measurement in high magnetic field is presented. The LC layers obtained by dispersion of cholesteric liquid crystals in a polymer matrix are placed at the end of the fiber optic head. A reflectivity of cholesteric LC layers depends on temperature with high sensitivity. Depending on the choice of microcapsulated cholesteric LC dispersed in the polymer matrix, the sensor can detect temperature in a narrow band (about 5 degrees) within the range 20-50 degree(s)C with a sensitivity of up to 0.01 degree in its linear range of operation (up to 1 degree(s)C). In order to increase range of operation we have used four light sources with different wavelengths. Typical multimode optical fibers for transmission of light from the light source (He-Ne, LD, LED) to the LC foil and next, after reflection, to the photodetector have been used. The microsensor probe was placed inside the electromagnet gap in which a magnetic field up to 1.2 T could be reached. As a result the temperature characteristics of the microsensor in different magnetic field configurations are presented. The principal conclusion to be drawn is that the temperature characteristics are not influenced by the magnetic field.

Paper Details

Date Published: 1 September 1991
PDF: 6 pages
Proc. SPIE 1510, Chemical and Medical Sensors, (1 September 1991); doi: 10.1117/12.47126
Show Author Affiliations
Andrzej W. Domanski, Warsaw Univ. of Technology (Poland)
Stanislaw Kostrzewa, Warsaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 1510:
Chemical and Medical Sensors
Otto S. Wolfbeis, Editor(s)

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