Title :
Fiber Sensor Based on Interferometer and Bragg Grating for Multiparameter Detection
Author :
Qi Wu ; Okabe, Yoji ; Jianghai Wo
Author_Institution :
Univ. of Tokyo, Tokyo, Japan
Abstract :
An integrated in-fiber Mach-Zehnder interferometer (MZI) and fiber Bragg grating (FBG) sensor that can simultaneously detect localized temperature, strain, and ultrasonics is proposed and demonstrated. Using a 60-mm single-mode fiber with a 12-mm FBG spliced to two 3-mm multimode fibers and lead-in and lead-out single-mode fibers, the sensor can discriminate temperature and strain from the responses of the MZI and the FBG to the two static parameters. Ultrasonic signals are directly recorded as high-frequency voltage vibration by demodulation of Bragg wavelength shift using a corresponding sensing system. The overall system shows high practical potential for use in nondestructive testing.
Keywords :
Bragg gratings; Mach-Zehnder interferometers; fibre optic sensors; integrated optics; nondestructive testing; optical fibre fabrication; strain sensors; temperature sensors; ultrasonic variables measurement; Bragg wavelength shift demodulation; FBG; MZI; fiber Bragg grating; fiber sensor; high-frequency voltage vibration; integrated in-fiber Mach-Zehnder interferometer; lead-in single-mode fibers; lead-out single-mode fibers; localized temperature detection; multiparameter detection; nondestructive testing; single-mode fiber; size 12 mm; splicing; strain detection; ultrasonic signal detection; Acoustics; Fiber gratings; Optical fiber sensors; Strain; Temperature measurement; Temperature sensors; Gratings; acoustic detectors; interferometry; nondestructive testing; strain; temperature;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2421350
