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Proceedings Paper

Fluorescent sol-gel layer for optical cryogenic temperature sensor
Author(s): S. Bertrand; F. Bresson; Gilbert M. Tribillon; Patrick Audebert
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Paper Abstract

The expansion of optical sensors and the interest of the sol-gel process for the working out of new materials, have led us to develop a sensor applied to cryogenic temperature measurement in harsh environments. The measurement technique uses the decay-time of the luminescence emitted by doped crystals, in response to a short duration excitation pulse. The principle of the measurement has already been demonstrated by a prototype with crystals under bulk shape, and we present here a non contact version of the sensor, using fluorescent layers deposited on mechanical parts. These layers are composed of photoluminescent crystals reduced to powder and mixed to a binder. The originality of this work is that the binder is a silica-based hybrid gel. Such a gel has a good adherence to metallic substrates in cryogenic mediums and it can be used in chemically oxidizing environments. The fluorescence decay-time technique associated with the sol-gel process can then provide an interesting alternative in the development of new noncontact optical fiber sensors, working in hostile conditions.

Paper Details

Date Published: 29 September 1995
PDF: 5 pages
Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); doi: 10.1117/12.221546
Show Author Affiliations
S. Bertrand, Univ. de Franche-Comte (France)
F. Bresson, Univ. de Franche-Comte (France)
Gilbert M. Tribillon, Univ. de Franche-Comte (France)
Patrick Audebert, Univ. de Franche-Comte (France)


Published in SPIE Proceedings Vol. 2546:
Optical Techniques in Fluid, Thermal, and Combustion Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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