scholarly journals Error Analysis of Integrated Absorbance for TDLAS in a Nonuniform Flow Field

2021 ◽  
Vol 11 (22) ◽  
pp. 10936
Author(s):  
Renjie Li ◽  
Fei Li ◽  
Xin Lin ◽  
Xilong Yu
Keyword(s):  
Diode Laser ◽  
Line Shape ◽  
Shape Function ◽  
Tunable Diode Laser ◽  
Nonuniform Flow ◽  
Laser Absorption ◽  
Fitting Method ◽  
Diagnosis Method ◽  
Diode Laser Absorption ◽  
General Method

As an effective optical diagnosis method, tunable diode-laser absorption spectroscopy (TDLAS) has increasingly moved to examine nonuniform flows, such as two-dimensional combustion diagnosis. To investigate the effect of nonuniformity along the line of sight in a measurement using TDLAS, the integrated absorbance (IA, the key intermediate quantity in TDLAS) error was quantified. The error distribution is obtained from the line-shape parameters through the comprehensive analysis of the line-shape function and the fitting method. The effects of the fitting function and the absorption line overlap are also considered. A general method for estimating the error is given. The work illustrates the applicability of TDLAS technology in nonuniform flow fields and provides input parameters for the evaluation of tunable diode laser absorption tomography error.

scholarly journals Supersonic Mass-Flux Measurements via Tunable Diode Laser Absorption and Nonuniform Flow Modeling

AIAA Journal ◽  
2011 ◽  
Vol 49 (12) ◽  
pp. 2783-2791 ◽  
Author(s):  
Leyen S. Chang ◽  
Christopher L. Strand ◽  
Jay B. Jeffries ◽  
Ronald K. Hanson ◽  
Glenn S. Diskin ◽  
...  
Keyword(s):  
Diode Laser ◽  
Mass Flux ◽  
Tunable Diode Laser ◽  
Flow Modeling ◽  
Nonuniform Flow ◽  
Laser Absorption ◽  
Flux Measurements ◽  
Diode Laser Absorption

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

Development of a tunable diode laser absorption spectrometer for measurements of the ratio in methane

Chemosphere ◽  
1993 ◽  
Vol 26 (1-4) ◽  
pp. 13-22 ◽  
Author(s):  
M. Schupp ◽  
P. Bergamaschi ◽  
G.W. Harris ◽  
P.J. Crutzen
Keyword(s):  
Diode Laser ◽  
Tunable Diode Laser ◽  
Laser Absorption ◽  
Diode Laser Absorption ◽  
Absorption Spectrometer
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