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

scholarly journals In-situ measurement of water-vapor in fire environments using a real-time tunable diode laser based system

2020 ◽  
pp. 103114
Author(s):  
Shruti Ghanekar ◽  
Rajavasanth Rajasegar ◽  
Nicholas Traina ◽  
Constandinos Mitsingas ◽  
Richard M. Kesler ◽  
...  
Keyword(s):  
Water Vapor ◽  
Real Time ◽  
Diode Laser ◽  
In Situ Measurement ◽  
Tunable Diode Laser ◽  
In Fire

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.

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