A review of developments in near infrared methane detection based on tunable diode laser

2012 ◽  
Vol 171-172 ◽  
pp. 77-92 ◽  
Author(s):  
Javad Shemshad ◽  
Saiied Mostafa Aminossadati ◽  
Mehmet Siddik Kizil
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Tunable Diode Laser ◽  
Methane Detection

In-situ CO measurement of gas and oil combustion flame using near infrared tunable diode laser with direct and modulated absorption signals

2013 ◽  
Vol 306 ◽  
pp. 99-105 ◽  
Author(s):  
Qun-xing Huang ◽  
Fei Wang ◽  
Hai-dan Zhang ◽  
Jian-hua Yan ◽  
Ming-jiang Ni ◽  
...  
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Tunable Diode Laser ◽  
Combustion Flame

Methane detection on the sub-ppm level with a near-infrared diode laser photoacoustic sensor

2003 ◽  
Vol 44 (4) ◽  
pp. 253-261 ◽  
Author(s):  
V. Zéninari ◽  
B. Parvitte ◽  
D. Courtois ◽  
V.A. Kapitanov ◽  
Yu.N. Ponomarev
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Ppm Level ◽  
Methane Detection

scholarly journals A simulation process of tunable open path diode laser spectrometer to detect a carbon monoxide gas in NIR region

2022 ◽  
Vol 961 (1) ◽  
pp. 012081
Author(s):  
Ruaa Kahtan Mahmood ◽  
Samira Adnan Mehdi
Keyword(s):  
Carbon Monoxide ◽  
Diode Laser ◽  
Near Infrared ◽  
Second Harmonic ◽  
Wave Length ◽  
Tunable Diode Laser ◽  
Theoretical Research ◽  
Laser Spectrometer ◽  
Diode Laser Spectrometer ◽  
Open Path

Abstract By modifying the wavelength of the open path tunable diode laser spectrometer (TDLS) in the near infrared region, theoretical research was implemented to improve the detection limit of carbon monoxide gas. To adjust the correct wavelength in the NIR area, MatLab code was created. Following that, frequency domain measurements were performed in order to extract the second harmonic as an indicator of gas presence. According to the results, the correct wave length in the NIR area is (1584.877 nm), and the lowest limit of CO gas concentration is (0.012 ppb).

scholarly journals A fiber-coupled laser hygrometer for airborne total water measurement

2014 ◽  
Vol 7 (1) ◽  
pp. 215-223 ◽  
Author(s):  
S. W. Dorsi ◽  
L. E. Kalnajs ◽  
D. W. Toohey ◽  
L. M. Avallone
Keyword(s):  
Water Vapor ◽  
Water Content ◽  
Diode Laser ◽  
Near Infrared ◽  
Tunable Diode Laser ◽  
Infrared Light ◽  
Closed Path ◽  
Total Water ◽  
University Of Colorado ◽  
Condensed Water

Abstract. The second-generation University of Colorado closed-path tunable-diode laser hygrometer (CLH-2) is an instrument for the airborne in situ measurement of total water content – the sum of vapor-, liquid- and ice-phase water – in clouds. This compact instrument has been flown on the NSF/NCAR Gulfstream-V aircraft in an underwing canister. It operates autonomously and uses fiber-coupled optics to eliminate the need for a supply of dry compressed gas. In operation, sample air is ingested into a forward-facing sub-isokinetic inlet; this sampling configuration results in particle concentrations that are enhanced relative to ambient and causes greater instrument sensitivity to condensed water particles. Heaters within the inlet vaporize the ingested water particles, and the resulting augmented water vapor mixing ratio is measured by absorption of near-infrared light in a single-pass optical cell. The condensed water content is then determined by subtracting the ambient water vapor content from the total and by accounting for the inertial enhancement of particles into the sampling inlet. The CLH-2 is calibrated in the laboratory over a range of pressures and water vapor mixing ratios; the uncertainty in CLH-2 condensed water retrievals is estimated to be 14.3% to 16.1% (1-σ). A vapor-only laboratory intercomparison with the first-generation University of Colorado closed-path tunable-diode laser hygrometer (CLH) shows agreement within the 2-σ uncertainty bounds of both instruments.

scholarly journals Recent Developments in Modulation Spectroscopy for Methane Detection Based on Tunable Diode Laser

2019 ◽  
Vol 9 (14) ◽  
pp. 2816 ◽  
Author(s):  
Fei Wang ◽  
Shuhai Jia ◽  
Yonglin Wang ◽  
Zhenhua Tang
Keyword(s):  
Semiconductor Lasers ◽  
Frequency Modulation ◽  
Near Infrared ◽  
Infrared Region ◽  
Tunable Diode Laser ◽  
Tone Frequency ◽  
Modulation Spectroscopy ◽  
Methane Absorption ◽  
Recent Developments ◽  
Methane Detection

In this review, methane absorption characteristics mainly in the near-infrared region and typical types of currently available semiconductor lasers are described. Wavelength modulation spectroscopy (WMS), frequency modulation spectroscopy (FMS), and two-tone frequency modulation spectroscopy (TTFMS), as major techniques in modulation spectroscopy, are presented in combination with the application of methane detection.

scholarly journals Mathematical Methods and Algorithms for Improving Near-Infrared Tunable Diode-Laser Absorption Spectroscopy

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4295 ◽  
Author(s):  
Tianyu Zhang ◽  
Jiawen Kang ◽  
Dezhuang Meng ◽  
Hongwei Wang ◽  
Zhengming Mu ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Tunable Diode Laser ◽  
Molecular Absorption ◽  
Laser Absorption Spectroscopy ◽  
Mathematical Methods ◽  
Laser Absorption ◽  
Optical Paths ◽  
Diode Laser Absorption

Tunable diode laser absorption spectroscopy technology (TDLAS) has been widely applied in gaseous component analysis based on gas molecular absorption spectroscopy. When dealing with molecular absorption signals, the desired signal is usually interfered by various noises from electronic components and optical paths. This paper introduces TDLAS-specific signal processing issues and summarizes effective algorithms so solve these.

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