Abstract
An adaptive filter for cancelling noise contained in the direct absorption spectra is
reported. This technique takes advantage of the periodical nature of the repetitively scanned
spectral signal, and requires no prior knowledge of the detailed properties of noises. An
experimental system devised for measuring CH<sub>4</sub> is used to test the performance of the filter. The
measurement results show that the signal-to-noise (S/N) value is improved by a factor of 2. A higher
enhancement factor of the S/N value of 5.4 is obtained through open-air measurement owing to higher
distortions of the raw data. In addition, the response time of this filter, which characterizes the
real-time detection ability of the system, is nine times shorter than that of a conventional signal
averaging solution, under the condition that the filter order is 100.
© 2013 Chinese Optics Letters
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