Abstract
Wavelength modulation technique (WMT) and active intra-cavity technique (ACIT) are first introduced in this paper, which are used to realize the concentration detection of methane and acetylene respectively. When ACIT is combined with wavelength sweep technique (WST), the detection sensitivity of acetylene can be enhanced sharply. When ACIT is combined with WST and WMT, the detection sensitivity of acetylene can be enhanced further.
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