Title :
Highly Sensitive Hydrostatic Pressure Sensing With an Embedded Dual-Polarization Fiber Grating Laser
Author :
Jin, Long ; Quan, Zhan ; Tan, Yan-Nan ; Guan, Bai-Ou
Author_Institution :
Inst. of Photonics Technol., Jinan Univ., Guangzhou, China
fDate :
6/15/2012 12:00:00 AM
Abstract :
In this letter, we propose and demonstrate a highly sensitive hydrostatic-pressure sensor based on a dual-polarization fiber grating laser. The sensor is fabricated by embedding such a laser into a polymer with a steel rod. Due to the significant difference in elastic property, a nonuniform stress field over the package is induced by the applied pressure and an additional intracavity birefringence is produced. The amplitude of the pressure can be measured by monitoring the beat frequency between the orthogonal polarization modes. The sensitivity reaches 0.217 GHz/MPa, 108.5 times higher than that of a bare fiber grating laser. Considering the fluctuation of the beat frequency of 0.3 MHz, the resolution of the sensor is about 1.4 kPa, within the range of 0-13 MPa.
Keywords :
birefringence; diffraction gratings; fibre lasers; fibre optic sensors; measurement by laser beam; pressure sensors; embedded dual polarization fiber grating laser; highly sensitive hydrostatic pressure sensing; highly sensitive hydrostatic pressure sensor; intracavity birefringence; Fiber gratings; Fiber lasers; Measurement by laser beam; Optical fiber polarization; Optical fiber sensors; Polymers; Sensitivity; Fiber grating laser sensors; fiber optic sensors; hydrostatic pressure sensing;
Journal_Title :
Photonics Technology Letters, IEEE
Conference_Location :
4/19/2012 12:00:00 AM
DOI :
10.1109/LPT.2012.2194999