29 September 1995 Fluorescent sol-gel layer for optical cryogenic temperature sensor
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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.
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S. Bertrand, S. Bertrand, F. Bresson, F. Bresson, Gilbert M. Tribillon, Gilbert M. Tribillon, Patrick Audebert, 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); doi: 10.1117/12.221546; https://doi.org/10.1117/12.221546

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