Temperature-insensitive multipoint strain-sensing system based on fiber Bragg gratings and optical power detection scheme

Author

Chiang, Y.J. ; Wang, Likarn ; Liu, Wen-Fung ; Hsiao, C.S.

Author_Institution

Inst. of Photonics Technol., Nat. Tsing Hua Univ., Hsinchu, Taiwan

Volume

6

Issue

2

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

465

Lastpage

470

Abstract

This work presents a new temperature-insensitive multipoint strain sensor based on fiber Bragg gratings. A divider circuit at the post detection port compensates for optical power variation and thermal instability induced by the nonflatness of the source spectrum. Experimental results show a measurement resolution of ±0.35 μS and a temperature stability of ±0.005% for no strain (±0.48% for a strain of <400 μS) in an example with two sensing points. A measurement linearity of ±0.17% is estimated in the range 0 to 350 μS with no crosstalk.

Keywords

Bragg gratings; dividing circuits; optical fibres; strain sensors; divider circuit; fiber Bragg gratings; optical power detection scheme; optical power variation; post detection port; source power instability; temperature stability; temperature-insensitive multipoint strain-sensing system; thermal instability; Bragg gratings; Capacitive sensors; Circuit stability; Fiber gratings; Optical crosstalk; Optical detectors; Optical sensors; Strain measurement; Temperature sensors; Tensile stress; Divider circuit; multipoint strain sensor; optical fiber Bragg grating (FBG); source power instability; temperature stability;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2006.870148

Filename

1608091