Two Interrogated FBG Spectral Linewidth for Strain Sensing through Correlation

Sensors

Kuo-Wei Chuang¹  Shih-Hsiang Hsu¹  Ci-Syu Chen¹  Che-Chang Chang²  Ching-Yu Lin³ 

[1] Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;Graduate Institute of Translational Medicine, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei 11031, Taiwan;School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, 250 Wu-Hsing Street, Taipei 11031, Taiwan;

关键词: fiber optics sensors;    remote sensing and sensors;    fiber Bragg gratings;    spectral linewidth;    correlation;   

DOI  :  10.3390/s17122837

来源: DOAJ

【 摘 要 】

The spectral linewidth from two cross-correlated fiber Bragg gratings (FBGs) are interrogated and characterized using a delayed self-homodyne method for fiber strain sensing. This approach employs a common higher frequency resolution instead of wavelength. A sensitivity and resolution of 166 MHz/με and 50 nε were demonstrated from 4 GHz spectral linewidth characterization on the electric spectrum analyzer. A 10 nε higher resolution can be expected through random noise analyses when the spectral linewidth from two FBG correlations is reduced to 1 GHz. Moreover, the FBG spectrum is broadened during strain and experimentally shows a 0.44 pm/με sensitivity, which is mainly caused by the photo elastic effect from the fiber grating period stretch.

【 授权许可】

Unknown