High-speed visible supercontinuum laser absorption spectroscopy of metal oxides

2021 ◽  
Author(s):  
Anthony LoCurto ◽  
James Michael ◽  
Travis Sippel ◽  
Michael Welch
Keyword(s):  
Metal Oxides ◽  
Absorption Spectroscopy ◽  
High Speed ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Supercontinuum Laser

Measurement of CO2 concentration based on supercontinuum laser absorption spectroscopy

2021 ◽  
Vol 17 (3) ◽  
pp. 176-182
Author(s):  
Hong-lian Li ◽  
Shuai Di ◽  
Wen-duo Li ◽  
Wen-jing Lü ◽  
Fan Wang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Co2 Concentration ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Supercontinuum Laser

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.

Simultaneous Measurements of Light Hydrocarbons Using Supercontinuum Laser Absorption Spectroscopy

2020 ◽  
Vol 34 (3) ◽  
pp. 3671-3678 ◽  
Author(s):  
Michael Halloran ◽  
Nicholas Traina ◽  
Jeongan Choi ◽  
Tonghun Lee ◽  
Jihyung Yoo
Keyword(s):  
Absorption Spectroscopy ◽  
Light Hydrocarbons ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Simultaneous Measurements ◽  
Supercontinuum Laser

scholarly journals Measurement of Temperature and H2O Concentration in Premixed CH4/Air Flame Using Two Partially Overlapped H2O Absorption Signals in the Near Infrared Region

2021 ◽  
Vol 11 (8) ◽  
pp. 3701
Author(s):  
Sunghyun So ◽  
Nakwon Jeong ◽  
Aran Song ◽  
Jungho Hwang ◽  
Daehae Kim ◽  
...  
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
High Speed ◽  
Equivalence Ratio ◽  
Tunable Diode Laser ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Voigt Fitting ◽  
Diode Laser Absorption ◽  
Combustion Environment

It is important to monitor the temperature and H2O concentration in a large combustion environment in order to improve combustion (and thermal) efficiency and reduce harmful combustion emissions. However, it is difficult to simultaneously measure both internal temperature and gas concentration in a large combustion system because of the harsh environment with rapid flow. In regard, tunable diode laser absorption spectroscopy, which has the advantages of non-intrusive, high-speed response, and in situ measurement, is highly attractive for measuring the concentration of a specific gas species in the combustion environment. In this study, two partially overlapped H2O absorption signals were used in the tunable diode laser absorption spectroscopy (TDLAS) to measure the temperature and H2O concentration in a premixed CH4/air flame due to the wide selection of wavelengths with high temperature sensitivity and advantages where high frequency modulation can be applied. The wavelength regions of the two partially overlapped H2O absorptions were 1.3492 and 1.34927 μm. The measured signals separated the multi-peak Voigt fitting. As a result, the temperature measured by TDLAS based on multi-peak Voigt fitting in the premixed CH4/air flame was the highest at 1385.80 K for an equivalence ratio of 1.00. It also showed a similarity to those tendencies to the temperature measured by the corrected R-type T/C. In addition, the H2O concentrations measured by TDLAS based on the total integrated absorbance area for various equivalent ratios were consistent with those calculated by the chemical equilibrium simulation. Additionally, the H2O concentration measured at an equivalence ratio of 1.15 was the highest at 18.92%.

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