Tunable diode laser absorption spectroscopy (TDLAS) is a widely used
technique in measuring the concentration of trace gas due to its high
sensitivity, high selectivity, and fast time response.
The fluctuations of temperature in the gas cell can cause the
characteristics of the absorption spectra to change in the TDLAS methane
sensing system. The three absorption lines in the R(3) transitions of
2v3 band of methane at 1653.72 nm have been studied, and the influence
of the temperature fluctuations on the spectral absorption coefficient
and the amplitude of second harmonic is analyzed.
A simple piece of equipment with temperature acquisition devices is
developed for measuring methane gas concentration, temperature signals
are obtained for eliminating the impact of temperature fluctuations.
Using calibration coefficient, the amplitude of second harmonic is
transformed into standard signal at reference temperature in order to
restrain the influence of temperature fluctuations. The results show
that this optic fiber methane gas sensor using tunable diode laser
absorption spectroscopy can restrains the influence of temperature
fluctuations and improves detection accuracy effectively.
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