Methane Gas Detection Based on Tunable Diode Laser Absorption Spectroscopy and Optical Fiber Sensing

2014 ◽  
Author(s):  
Wei-Hua Zhang ◽  
Wen-Qing Wang ◽  
Lei Zhang ◽  
Xin Dai ◽  
Xiao-Lu Liu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Tunable Diode Laser ◽  
Gas Detection ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Diode Laser Absorption

Optimization of Harmonic Detection System for Tunable Diode Laser Absorption Spectroscopy Based on Mathematical Algorithm

2018 ◽  
Vol 13 (10) ◽  
pp. 1533-1542 ◽  
Author(s):  
Danni Shen ◽  
Anji Yu
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Detection System ◽  
Rapid Development ◽  
Noise Removal ◽  
Tunable Diode Laser ◽  
Gas Detection ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

Traditional gas detection technology has a certain degree of defects in all aspects, and it has not been able to adapt to the rapid development trend. Tunable diode laser absorption spectroscopy (TDLAS) technology has some good performance and is gradually being used in various industries. First, a gas detection instrument is designed. Then, based on subsequent data processing techniques, a wavelet transform algorithm is proposed, and the noise removal and baseline correction functions of the detection system are implemented. The results show that the proposed method has good removal effect on the inherent noise of the system and high efficiency. During the selection of the absorption line, the selected line of some gases cannot avoid the interference of adjacent peaks. Therefore, a mathematical analysis method of differential fold back algorithm is proposed. The absorption peak shape is squeezed by the method of adjacent phase subtraction and displacement superposition. The problem is solved well, and the accuracy of concentration measurement of some gases is effectively improved.

A Fire Warning Method Using Tunable Diode Laser Absorption Spectroscopy

2021 ◽  
Vol 16 (2) ◽  
pp. 222-229
Author(s):  
Lin Feng ◽  
Jian Wang ◽  
Chao Ding
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Gas Absorption ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Gas Concentration ◽  
Laser Absorption ◽  
Output Wavelength ◽  
Light Beams ◽  
Diode Laser Absorption

Tunable diode laser absorption spectroscopy (TDLAS) technology is adopted herein to detect fire gas produced in the early stage of the fire. Based on this technology, a fire warning detection system with multiple lasers and detectors is proposed. Multiple drivers input laser’s temperature and injected current data, making its output wavelength consistent with the measured gas’ absorption peak wavelengths in absorption spectroscopy. Multiple light beams are coupled to the same optical fiber. After the light beams pass through the long optical path absorption cell filled with fire gas, the beams are separated by a converter. The signals are demodulated by different detectors and further analyzed for fire warnings. After the fire warning system’s design, the system’s various hardware modules are designed, including the light source module, TDLAS controller, gas chamber module, photoelectric detector, and data collection. When the temperature remains unchanged, the output wavelength is linearly related to the injected current. When the injected current remains unchanged, the output wavelength is linearly related to the operating temperature. With a semiconductor laser’s injected current of 40 mA, the initial temperature of 38.6 °C, and the output wavelength of 1578.16 nm, the output wavelength increases continuously as the temperature increases. The harmonic signal amplitude after gas absorption is positively correlated with the measured gas concentration, indicating that the second harmonic signals can estimate the fire gas concentration.

Time-resolved tunable diode laser absorption spectroscopy of pulsed plasma

2013 ◽  
Vol 38 (14) ◽  
pp. 2428 ◽  
Author(s):  
P. Adámek ◽  
J. Olejníček ◽  
M. Čada ◽  
Š. Kment ◽  
Z. Hubička
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Tunable Diode Laser ◽  
Pulsed Plasma ◽  
Laser Absorption Spectroscopy ◽  
Time Resolved ◽  
Laser Absorption ◽  
Diode Laser Absorption
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