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Study on matched grating demodulation of weakstrain fiber grating sensor(PDF)

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2019年02期
Page:
224-
Research Field:
Publishing date:

Info

Title:
Study on matched grating demodulation of weakstrain fiber grating sensor
Author(s):
Wang RuolingLi JunMo Zonglai
School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
Keywords:
matched grating weak strain fiber grating sensors demodulation process
PACS:
TP212; TN247
DOI:
10.14177/j.cnki.32-1397n.2019.43.02.015
Abstract:
Based on the strain sensor of weak reflection fiber Bragg grating,the model of grating reflection spectrum is established,and the influence of grating length,period and arrangement order on the grating reflectivity is analyzed. It is found that the maximum reflectivity of grating increases with the increase of grating length and modulation depth,while the spectral width is greatly affected by the change of grating length:the smaller the grating length,the larger the spectral width. The peak reflectivity of the weak reflection grating array is related to the position of the grating. Being affected by multiple reflections,the lower the sensor grating,the smaller the peak reflectivity. By analyzing the reflection spectra in the demodulation process,the functional relationship between the strain of the sensor and the output light intensity is obtained.

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Last Update: 2019-04-26