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Proceedings Paper

Accuracy and calibration considerations for fiber optic temperature sensors
Author(s): Vito C. Fernicola; R. Galleano
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Paper Abstract

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.

Paper Details

Date Published: 25 October 1996
PDF: 5 pages
Proc. SPIE 2839, Fiber Optic and Laser Sensors XIV, (25 October 1996); doi: 10.1117/12.255357
Show Author Affiliations
Vito C. Fernicola, Instituto di Metrologia G. Colonnetti/CNR (Italy)
R. Galleano, Instituto di Metrologia G. Colonnetti/CNR (Italy)

Published in SPIE Proceedings Vol. 2839:
Fiber Optic and Laser Sensors XIV
Ramon P. DePaula; John W. Berthold III, Editor(s)

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