Title :
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
fDate :
10/1/1999 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
