Fluorescent sol-gel layer for optical cryogenic temperature sensor

S. Bertrand; F. Bresson; Gilbert M. Tribillon; Patrick Audebert

doi:10.1117/12.221546

29 September 1995 Fluorescent sol-gel layer for optical cryogenic temperature sensor

S. Bertrand, F. Bresson, Gilbert M. Tribillon, Patrick Audebert

Proceedings Volume 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow; (1995) https://doi.org/10.1117/12.221546
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

S. Bertrand, F. Bresson, Gilbert M. Tribillon, and Patrick Audebert "Fluorescent sol-gel layer for optical cryogenic temperature sensor", Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); https://doi.org/10.1117/12.221546

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