Journal ArticleDOI
Diagnostics of an argon arcjet plume with a diode laser
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TLDR
The diode-laser absorption technique was applied for simultaneous velocity and temperature measurements of an argon plume exhausted by an arcjet and the technique can be applied to the measurement of other arcjet systems without much modification.Abstract:
The diode-laser absorption technique was applied for simultaneous velocity and temperature measurements of an argon plume exhausted by an arcjet. The Ar i absorption line at 811.531 nm was taken as the center absorption line. The velocity and the temperature were derived from the Doppler shift in the absorption profiles and the full width at half-maximum of the plume absorption profile, respectively. From the measured plume velocity and temperature, the total enthalpy of the exhausted plume, the thrust efficiency, and the thermal efficiency of the arcjet were derived, and the performance of the arcjet was examined. The results are demonstrated to agree with results derived by other methods, and the technique can be applied to the measurement of other arcjet systems without much modification.read more
Citations
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Journal ArticleDOI
Numerical investigation of hyperspectral tomography for simultaneous temperature and concentration imaging
Lin Ma,Weiwei Cai +1 more
TL;DR: The simulation results clearly demonstrate that the use of hyperspectral absorption data significantly reduces the number of projections, enables simultaneous mapping of temperature and species concentration, and provides more stable reconstruction compared with traditional absorption tomographic techniques.
Journal ArticleDOI
Application of simulated annealing for multispectral tomography
Weiwei Cai,David J. Ewing,Lin Ma +2 more
TL;DR: A new method based on simulated annealing is developed to obtain tomographic reconstructions based on multispectral absorption spectroscopy that is able to exploit the spectral information content, to incorporate various a priori information, and to ameliorate the ill-posedness of the tomographic inversion problem.
Journal ArticleDOI
Diode-laser tomography for arcjet plume reconstruction
TL;DR: Diode-laser absorption tomography is described with which the spatial temperature and the atomic number density distribution of a 3-kW class arcjet can be derived simultaneously by reconstruction of the absorption coefficient field of the arcjet's argon exhaust plume.
Journal ArticleDOI
The design, construction and testing of a microcombustion calorimeter suitable for organic compounds containing C, H and O
Juan Z. Dávalos,M. Victoria Roux +1 more
TL;DR: In this paper, a micro-combustion calorimetry system was used to obtain reliable standard energies of combustion with small amounts of C, H, O compounds, and a new micro-calorimetric system was set up.
Journal ArticleDOI
Nitric-Oxide Planar Laser-Induced Fluorescence Measurements in the Hypersonic Materials Environmental Test System
Jennifer A. Inman,Brett F. Bathel,Craig T. Johansen,Paul M. Danehy,Stephen B. Jones,Jeffrey G. Gragg,Scott C. Splinter +6 more
TL;DR: In this paper, a planar laser-induced fluorescence of naturally occurring nitric oxide has been used to provide insight into baseline flow conditions of the Hypersonic Materials Environmental Test System 400kW arc-heated wind tunnel at NASA Langley Research Center via radial and axial velocity measurements and instantaneous flow-visualization images.
References
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TL;DR: A review of the use of diode lasers in atomic physics with an extensive list of references can be found in this article, where the authors discuss the relevant characteristics of dioder lasers and explain how to purchase and use them.
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