Title :
Digital optical fiber point sensor for high-temperature measurement
Author :
Fernicola, Vito ; Crovini, Luigi
Author_Institution :
Istituto di Metrol. G. Colonnetti, CNR, Torino, Italy
fDate :
7/1/1995 12:00:00 AM
Abstract :
The development and performance of a high-temperature optical fiber point sensor based on fluorescence decay time of a chromium-doped material are reported. The device exploits a novel digital signal processing scheme for decay time measurement. It is based on a modified phase-sensitive-detection technique with the phase locked to a fixed value and the modulation frequency tracking the measured decay time. The sensor was calibrated in the temperature range from -25 to 500°C with a 0.1°C resolution. Remarkable features are the system immunity to fluorescent intensity losses and the long-term stability, showing a maximum drift of 0.3°C over more than 600 h
Keywords :
calibration; fibre optic sensors; fluorescence; high-temperature techniques; optical information processing; optical losses; optical modulation; optical tracking; stability; temperature measurement; temperature sensors; -25 to 500 C; 600 h; calibrated; chromium-doped material; decay time measurement; digital optical fiber point sensor; digital signal processing scheme; fluorescence decay time; fluorescent intensity losses; high-temperature measurement; long-term stability; maximum drift; measured decay time tracking; modified phase-sensitive-detection technique; modulation frequency; phase locked; resolution; system immunity; temperature range; Digital signal processing; Fluorescence; Frequency measurement; Frequency modulation; Optical fiber sensors; Optical fibers; Optical materials; Phase modulation; Temperature sensors; Time measurement;
Journal_Title :
Lightwave Technology, Journal of
