Digital optical fiber point sensor for high-temperature measurement

Author

Fernicola, Vito ; Crovini, Luigi

Author_Institution

Istituto di Metrol. G. Colonnetti, CNR, Torino, Italy

Volume

13

Issue

7

fYear

1995

fDate

7/1/1995 12:00:00 AM

Firstpage

1331

Lastpage

1334

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.400680

Filename

400680