Interband cascade laser absorption of hydrogen chloride for high-temperature thermochemical analysis of fire-resistant polymer reactivity

2020 ◽  
Vol 59 (7) ◽  
pp. 2141 ◽  
Author(s):  
Daniel I. Pineda ◽  
James L. Urban ◽  
R. Mitchell Spearrin
Keyword(s):  
High Temperature ◽  
Hydrogen Chloride ◽  
Laser Absorption ◽  
Interband Cascade Laser ◽  
Absorption Of Hydrogen

High-temperature DMMP combustion measurements in a shock tube using laser absorption spectroscopy

2020 ◽  
Author(s):  
Ramees Rahman ◽  
Sneha Neupane ◽  
Jessica Baker ◽  
Erik M. Ninnemann ◽  
Farhan Arafin ◽  
...  
Keyword(s):  
High Temperature ◽  
Shock Tube ◽  
Absorption Spectroscopy ◽  
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.

Laser-Assisted Field Evaporation of (R = Gd, Sm) High-Temperature Superconducting Coated Conductors

2021 ◽  
pp. 1-18
Author(s):  
Jesse D. Smith ◽  
Jeong Huh ◽  
Adam Shelton ◽  
Richard F. Reidy ◽  
Marcus L. Young
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Compositional Analysis ◽  
Atom Probe ◽  
Fracture Probability ◽  
Coated Conductors ◽  
Field Evaporation ◽  
Laser Absorption ◽  
New Instrument ◽  
New Perspective

In the field of high-temperature superconductors, atom probe tomography is a relatively new instrument, with the ability to provide a new perspective on the 3D nanoscale microstructure. However, field evaporation of nonmetallic materials is fraught with unique challenges that matter little in the world of metallic evaporation. In this study, we review the laser absorption, correlated evaporation, molecular dissociation, and the crystallographic effects on the field evaporation of 800-m ${\rm RB}{\rm a}_ 2{\rm C}{\rm u}_ 3{\rm O}_{ 7-{\rm \delta }}$ (R = Gd, Sm) coated conductor tapes deposited by Reactive Co-Evaporation Cyclic Deposition and Reaction (RCE-CDR). Ultraviolet 355 nm laser pulsing was found to have a substantial beneficial effect on minimizing the fracture probability compared with 532 nm illumination, especially when evaporating insulating oxide precipitates. This, in turn, allows for the 3D compositional analysis of defects such as flux pinning centers introduced by precipitation and doping. As a result, evidence for the precipitation of nanoscale ${\rm G}{\rm d}_ 2{\rm C}{\rm u}_ 2{\rm O}_ 5$ is discussed. The effect of crystallographic orientation is studied, where [001] aligned evaporation is found to develop compositional aberrations.

Laser absorption spectroscopy for high temperature H 2 O time-history measurement at 2.55 μm during oxidation of hydrogen

2018 ◽  
Vol 27 (7) ◽  
pp. 074213
Author(s):  
Yu-Dan Gou ◽  
De-Xiang Zhang ◽  
Yi-Jun Wang ◽  
Chang-Hua Zhang ◽  
Ping Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Absorption Spectroscopy ◽  
Time History ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Oxidation Of Hydrogen

scholarly journals High Temperature Corrosion of Oxide Ceramics in Chlorine and Hydrogen Chloride Gases

1997 ◽  
Vol 46 (11) ◽  
pp. 736-738
Author(s):  
Kohei Oda ◽  
Masayuki Ito ◽  
Shingo Sato ◽  
Kaoru Aoki ◽  
Tetsuo Yoshio
Keyword(s):  
High Temperature ◽  
Hydrogen Chloride ◽  
High Temperature Corrosion ◽  
Oxide Ceramics
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