Abstract
A remote fiber-optic methane gas sensor system is proposed and demonstrated with
accurate gas concentration measurement and good mitigation of cross gas sensitivity. We
use a polarization-maintaining photonic crystal fiber (PM-PCF)-based Sagnac loop filter
to slice the spectrum of a broadband light source so as to precisely match several
absorption lines of the methane gas within the near-infrared band. Meanwhile, a compact
and cost-effective gas cell with multiple reflections is designed to enhance the
interaction between the light beam and the methane gas to be detected, which also
subsequently increase the system sensitivity. Due to the insensitive temperature
dependence of the PM-PCF-based comb filter, we can obtain gas concentration measurement
with a sensitivity of ~410 ppm. Moreover, by intentionally pumping the acetylene
gas into the gas cell during the methane gas concentration measurement, the power
variation caused by the interfering gas with 100% concentration is only equals to 0.7%
of the power variation induced by the 100% concentration methane gas. Thus, effective
mitigation of cross gas sensitivity is experimentally verified. The proposed fiber-optic
methane gas sensor system is verified with low cost, compact size, potential capability
of multipoint detection, and high sensitivity.
© 2012 IEEE
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