Abstract
Wavelength modulation technique (WMT) and wavelength sweep technique (WST)
are introduced into intracavity fiber laser for both gas concentration
sensing and absorption wavelength detection in this paper. The principle of
gas sensing and spectral analysis using WMT and WST was studied. Polynomial
fit was adopted to model the system nonlinear characteristic, based on which
absorption wavelength can be detected. The system optimization and acetylene
gas sensing were both realized, and the absolute detected error can be
increased less than 75 ppm. The absorption wavelengths of the detected gas
were calculated based on the polynomial fitting results of the system
nonlinear. The absorption wavelengths of acetylene were detected using this
method, with absolute error no more than 0.445 nm. The system has the
ability of realizing both concentration sensing and gas-type
recognition.
© 2010 IEEE
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