Fiber-optic Fabry-Perot temperature sensor using a low-coherence light source

Author

Lee, Chung E. ; Taylor, Henry F.

Author_Institution

Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA

Volume

9

Issue

1

fYear

1991

fDate

1/1/1991 12:00:00 AM

Firstpage

129

Lastpage

134

Abstract

An interferometric fiber-optic sensor using a light-emitting diode (LED) as the optical source is analyzed and demonstrated. The sensor arrangement employs two Fabry-Perot interferometers (FPIs) in series, one for sensing and one which serves as a reference. The optical output from the LED is spectrally modulated by reflection from the sensing FPI. Then, reflection or transmission by the reference FPI produces an interferometric beat response similar to that observed when a laser is used with the sensing interferometer alone. Best fringe visibility is obtained when the optical path lengths of the two interferometers are matched, and the fringes disappear when the path length difference becomes substantially greater than the coherence length of the LED

Keywords

fibre optic sensors; light coherence; light emitting diodes; light interferometers; temperature measurement; coherence length; fibre optic Fabry-Perot temperature sensor; fringe visibility; interferometric beat response; interferometric fiber-optic sensor; light-emitting diode; low-coherence light source; optical output; optical path lengths; optical source; path length difference; reflection; transmission; two Fabry-Perot interferometers; Fabry-Perot; Light emitting diodes; Light sources; Optical fiber sensors; Optical interferometry; Optical modulation; Optical sensors; Sagnac interferometers; Stimulated emission; Temperature sensors;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.64932

Filename

64932