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25 October 1996 Accuracy and calibration considerations for fiber optic temperature sensors
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In the present work, the performance characteristics of a set of six fiber optic temperature sensors based on the fluorescence lifetime of neodymium-doped glass have been investigated. The experiment is aimed at verifying whether a satisfactory probe-to-probe repeatability and sensor accuracy can be obtained with minimum calibration effort. To accomplish this task the fiber-optic probes were calibrated, in the temperature range 0 degrees Celsius to 250 degrees Celsius, by comparison against a platinum resistance thermometer in a metal block furnace. The experimental set- up consisted of an electro-optical unit for fluorescence excitation and detection and an analog-to-digital signal processing circuit for lifetime measurements. The temperature probes were assembled by placing the Nd-doped glass at the distal end of a silica optical fiber and by splicing the other fiber end to a 1 by 2 wavelength- independent coupler. The calibration results and the temperature repeatability of the Nd:glass probes are reported. The reproducibility of the measurement method, with an optimum calibration function, and the resulting accuracy are discussed.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vito C. Fernicola and R. Galleano "Accuracy and calibration considerations for fiber optic temperature sensors", Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996);

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