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Real-time and accurate detection of the flammable gas concentration is the key issue in spontaneous combustion prediction. A modified tunable diode laser absorption spectroscopy (TDLAS) technology has been used in this paper to achieve in-situ detection of trace Acetylene concentration. Noises and interference fringes are eliminated by wavelet adaptive threshold filtering, and then Kalman filtering...
Recent progress in development of broadly tunable Cr:ZnSe lasers for trace gas detection is reported. With an intracavity CaF2 prism, the CW Cr:ZnSe laser was tuned within a total wavelength range of 427 nm from 2164 nm to 2591 nm. And, the applied research about trace gas sensing based on Mid-IR broadly tunable Cr:ZnSe lasers has been discussed in this paper, which indicated that a single-frequency...
Based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) and the feature of Vertical Cavity Surface Emitting Laser (VCSEL) which wavelength scanning range up to several nanometers, the methane sensor system was designed. To verify the characteristic of anti-cross interference, we made some spectroscopy stimulation and experiments to analyze the affects to the methane measurement results of the...
Due to the coal mine safety requirements for a new generation of methane sensor in recent years, coal mine methane sensor laser has attracted more and more attention. Based on the principle of laser absorption spectroscopy, mine laser methane sensor was developed, a series of detailed performance test were carried out. Compared with traditional catalytic combustion sensor and infrared sensor, laser...
A novel all fiber optic sensing monitoring technique is researched for remotely detecting the concentration of methane gas. The triangular signal is used to modulate the light wavelength of the DFB laser. The narrow absorption line of the laser eliminates the cross sensitivity to moisture, ethane or other gases. With the use of the optical fiber links between monitor and sensor header, the system...
A multi-channel optical fiber methane monitoring system is researched for detecting the concentration of methane gas. In this system, distributed feedback laser is employed as light source. The narrow absorption line of the laser could effectively eliminates the cross sensitivity to moisture, ethane or other gases. Since the sensor head is made without any active electrical components, it is intrinsically...
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