Application of Fiber Bragg grating for determining positions of gas absorption lines |
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| Authors: | HAN Wennian WANG Yan MA Feng LIU Kun JIA Dagong LIU Tiegen ZHANG Hongxia |
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| Institution: | HAN Wennian,WANG Yan,MA Feng,LIU Kun,JIA Dagong,LIU Tiegen,ZHANG Hongxia(School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China) |
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| Abstract: | Fiber Bragg grating (FBG) is used as a wavelength reference device to calibrate the position of gas absorption peak in the
intracavity absorption gas sensor (ICAGS) based on erbium-doped fiberring laser. This system can detect both the reflectance
spectrum of FBGs and absorption spectrum of measured gas during a single wavelength sweeping process by linearly varying the
driving voltage of optic filter. The voltages corresponding to center wavelength positions of four FBGs in the spectrum are
determined through Gaussian peak fitting. Then, the wavelengths of gas absorption lines are deduced from the correspondence
between driving voltage and wavelength obtained by quadratic curve fitting. The maximum error of wavelength of acetylene absorption
lines between experimental results and those from HITRAN database is 0.106 nm and the resolving accuracy of two adjacent absorption
lines is about 93.593%. By using this method, ICAGS can theoretically recognize the measured gas type and monitor multi-gas
components. |
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| Keywords: | fiber Bragg grating gas absorption erbium-doped fiber Gaussian fitting |
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