Static fiber-Bragg grating strain sensing using frequency-locked lasers

Author

Arie, Ady ; Lissak, Boaz ; Tur, Moshe

Author_Institution

Fac. of Eng., Tel Aviv Univ., Israel

Volume

17

Issue

10

fYear

1999

fDate

10/1/1999 12:00:00 AM

Firstpage

1849

Lastpage

1855

Abstract

Novel and highly sensitive static strain interrogation technique is demonstrated, where the sensing element is a fiber-Bragg grating (FBG) and the light source is a frequency-locked diode laser. Locking the laser frequency to the center of an absorption line (atomic line of potassium in our experiment) eliminates the slow frequency drift of the laser. The stabilized laser source is used to measure low frequency (“static”) strain, with a sensitivity of 1.2 nanostrain/√Hz rms at 1.5 Hz

Keywords

Bragg gratings; fibre optic sensors; laser frequency stability; measurement by laser beam; semiconductor lasers; sensitivity; strain measurement; strain sensors; absorption line centre frequency locked laser; atomic line; fiber-Bragg grating; frequency-locked diode laser; frequency-locked lasers; highly sensitive static strain interrogation technique; light source; low frequency static strain measurement; sensing element; sensitivity; slow frequency drift; stabilized laser source; static fiber-Bragg grating strain sensing; Absorption; Atom lasers; Bragg gratings; Capacitive sensors; Diode lasers; Fiber gratings; Fiber lasers; Frequency; Light sources; Strain measurement;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.793765

Filename

793765