A new detection technique of gas concentration with optical spectrum absorption at near-IR wavelength

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. This work has been supported by the National Natural Science foundation of China (contact No. 60577013), and the New Century Support Program for Talented Young Teachers in Universities, Ministry of Education of China.