scholarly journals Dynamic computational optical fringe mitigation in tunable laser absorption spectroscopy

2020 ◽  
Vol 28 (26) ◽  
pp. 39017
Author(s):  
Chu C. Teng ◽  
Eric J. Zhang ◽  
Chi Xiong ◽  
William M. J. Green ◽  
Gerard Wysocki
Keyword(s):  
Absorption Spectroscopy ◽  
Tunable Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption

scholarly journals Measurement of Atmospheric Dimethyl Sulfide with a Distributed Feedback Interband Cascade Laser

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3216 ◽  
Author(s):  
Shuanke Wang ◽  
Zhenhui Du ◽  
Liming Yuan ◽  
Yiwen Ma ◽  
Xiaoyu Wang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Dimethyl Sulfide ◽  
Tunable Laser ◽  
Distributed Feedback ◽  
Integration Time ◽  
Laser Absorption Spectroscopy ◽  
Atmospheric Measurements ◽  
Pure Nitrogen ◽  
Laser Absorption ◽  
Interband Cascade Laser

This paper presents a mid-infrared dimethyl sulfide (CH3SCH3, DMS) sensor based on tunable laser absorption spectroscopy with a distributed feedback interband cascade laser to measure DMS in the atmosphere. Different from previous work, in which only DMS was tested and under pure nitrogen conditions, we measured DMS mixed by common air to establish the actual atmospheric measurement environment. Moreover, we used tunable laser absorption spectroscopy with spectral fitting to enable multi-species (i.e., DMS, CH4, and H2O) measurement simultaneously. Meanwhile, we used empirical mode decomposition and greatly reduced the interference of optical fringes and noise. The sensor performances were evaluated with atmospheric mixture in laboratory conditions. The sensor’s measurement uncertainties of DMS, CH4, and H2O were as low as 80 ppb, 20 ppb, and 0.01% with an integration time 1 s, respectively. The sensor possessed a very low detection limit of 9.6 ppb with an integration time of 164 s for DMS, corresponding to an absorbance of 7.4 × 10−6, which showed a good anti-interference ability and stable performance after optical interference removal. We demonstrated that the sensor can be used for DMS measurement, as well as multi-species atmospheric measurements of DMS, H2O, and CH4 simultaneously.

DFB interband cascade lasers for tunable laser absorption spectroscopy from 3 to 6 μm

2013 ◽  
Author(s):  
M. von Edlinger ◽  
J. Scheuermann ◽  
L. Nähle ◽  
C. Zimmermann ◽  
L. Hildebrandt ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Tunable Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Interband Cascade Lasers ◽  
Cascade Lasers

Testing on diesel engine emission temperature using tunable laser absorption spectroscopy technology

2020 ◽  
Vol 13 (2) ◽  
pp. 281-289
Author(s):  
袁志国 YUAN Zhi-guo ◽  
马修真 MA Xiu-zhen ◽  
刘晓楠 LIU Xiao-nan ◽  
穆彦龙 MU Yan-long ◽  
杨晓涛 YANG Xiao-tao
Keyword(s):  
Diesel Engine ◽  
Absorption Spectroscopy ◽  
Tunable Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Engine Emission ◽  
Diesel Engine Emission

scholarly journals Research on method for high sensitive detection of harmful gases in livestock houses based on laser absorption spectrum

2020 ◽  
Vol 189 ◽  
pp. 01004
Author(s):  
Runyu Wang ◽  
Daming Dong ◽  
Zengtao Ji ◽  
Leizi Jiao
Keyword(s):  
Absorption Spectroscopy ◽  
Tunable Laser ◽  
High Sensitivity ◽  
Laser Wavelength ◽  
Gas Absorption ◽  
Gas Detection ◽  
Scanning System ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Poultry Houses

Harmful gases such as ammonia and hydrogen sulfide in livestock and poultry houses can seriously damage the health of livestock and poultry as well as animal keepers, so it is great significant to detect these harmful gases rapidly and accurately for the improvement of the welfare of animals and the health of animal keepers. Laser absorption spectroscopy is a gas detection method with the advantages of high sensitivity and selectivity, and is widely used in industrial gas detection. However, it needs further exploring to verify whether laser absorption spectroscopy is useful in detecting low concentration harmful gases in livestock and poultry houses. This paper researches on the method for high-sensitivity detection of harmful gases in livestock and poultry houses based on laser absorption spectroscopy by detecting the absorption signals of ammonia with a self-designed system including a tunable laser wavelength scanning system, a photoelectric detecting system and a long light path gas absorption well, and verifies that laser absorption spectroscopy can be used for detecting harmful gases in livestock and poultry houses.

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