Single-mode distributed-feedback GaAs/AlGaAs quantum well lasers for laser absorption spectroscopy

1995 ◽  
Author(s):  
Nancy A. Morris ◽  
John C. Connolly ◽  
Ramon U. Martinelli ◽  
Joseph H. Abeles ◽  
David E. Cooper ◽  
...  
Keyword(s):  
Quantum Well ◽  
Absorption Spectroscopy ◽  
Single Mode ◽  
Distributed Feedback ◽  
Quantum Well Lasers ◽  
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.

scholarly journals Stability Analysis of the Fluorescent Tracer 1-Methylnaphthalene for IC Engine Applications by Supercontinuum Laser Absorption Spectroscopy

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2871 ◽  
Author(s):  
Peter Fendt ◽  
Ulrich Retzer ◽  
Hannah Ulrich ◽  
Stefan Will ◽  
Lars Zigan
Keyword(s):  
Absorption Spectroscopy ◽  
Beam Steering ◽  
Single Mode ◽  
Signal Loss ◽  
Planar Imaging ◽  
Laser Absorption Spectroscopy ◽  
Double Pass ◽  
Ic Engine ◽  
Laser Absorption ◽  
Supercontinuum Laser

1-methylnaphthalene (1-MN) is a widely used laser-induced fluorescence (LIF) tracer for planar imaging of mixture formation and temperature distributions in internal combustion (IC) engines. As the LIF measurement results can be biased by partial tracer oxidation, the conversion of 1-MN and the base fuel isooctane is analyzed in a calibration cell. First, measurements using supercontinuum laser absorption spectroscopy (SCLAS) are presented in order to quantify the conversion by detection of the produced H2O mole fraction. A single mode fiber (SMF) coupled setup is presented, with the fiber core acting as entrance slit of a Czerny-Turner spectrometer. Dependencies on residence time and global air-fuel ratio are presented at pressures up to 1.5 MPa and temperatures up to 900 K, at which distinct tracer and fuel consumption is observed. Signal loss due to intense beam steering was partially compensated using a self-stabilizing double-pass setup with a retroreflector.

Direct single-mode fibre-coupled miniature White cell for laser absorption spectroscopy

2016 ◽  
Vol 87 (2) ◽  
pp. 023111 ◽  
Author(s):  
Benjamin Kühnreich ◽  
Matthias Höh ◽  
Steven Wagner ◽  
Volker Ebert
Keyword(s):  
Absorption Spectroscopy ◽  
Single Mode ◽  
White Cell ◽  
Laser Absorption Spectroscopy ◽  
Single Mode Fibre ◽  
Laser Absorption ◽  
Mode Fibre

INTRACAVITY LASER ABSORPTION SPECTROSCOPY OF NO2 AND CH4 COOLED IN A SLIT JET SUPERSONIC EXPANSION

1991 ◽  
Vol 01 (C7) ◽  
pp. C7-471-C7-476
Author(s):  
A. CAMPARGUE ◽  
M. CHENEVIER ◽  
A. DELON ◽  
R. JOST ◽  
F. STOECKEL
Keyword(s):  
Absorption Spectroscopy ◽  
Laser Absorption Spectroscopy ◽  
Supersonic Expansion ◽  
Laser Absorption ◽  
Intracavity Laser
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