Abstract
A novel long-period fiber grating (LPFG) film methane sensor is designed and
applied successfully. The sensor is constructed by depositing a thin
styrene-acrylonitrile (SAN) film containing the new compound
cryptophane-E-(OEt)<sub>6</sub> onto the cladding surface of the LPFG. This film
is sensitive to methane gas. Methane causes a change in the refractive index of the
sensing film, which can be measured by shifting the resonance wavelength.
Experimental results show that the resonant wavelength shifts to the longer
wavelength, with increasing methane concentration at a range of 0.0%-3.5% (v/v). A
linear relationship is obtained within the test range. Detection limit is estimated
at 0.2%, and response time is 60 s. No significant interference is detected from dry
air, O<sub>2</sub>, CO, CO<sub>2</sub>, and H<sub>2</sub>. This novel methane sensing material has great application
potential due to its advantages.
© 2012 Chinese Optics Letters
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