Investigation of infra-red and nonequilibrium air radiation

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High Temperature Gasdynamic Laboratory, Mechanical Engineering Dept., Stanford University, National Aeronautics and Space Administration, National Technical Information Service, distributor , [Stanford, Calif.], [Washington, DC, Springfield, Va
Statementsubmitted by C.H. Kruger, principal investigator.
Series[NASA contractor report] -- NASA CR-197977., NASA contractor report -- NASA CR-197977.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17008594M
OCLC/WorldCa33052749

This report describes progress on the first year of a research program on the infrared radiation of air plasmas conducted in the High Temperature Gasdynamics Laboratory at Stanford University. This program is intended to investigate the masking of infrared signatures by the air plasma formed behind the bow shock of high velocity : Charles H.

Kruger. INVESTIGATION OF INFRA-RED AND NONEQUILIBRIUM AIR RADIATION Grant No. NAG Prepared for NATIONAL AERONAUTICS AND SPACE ADMINISTRATION For the Period May 1, to Febru Submitted by C.H.

Kruger, Principal Investigator High Temperature Gasdynamics Laboratory Stanford, California Get this from a library. Final technical report on investigation of infra-red and nonequilibrium air radiation: grant no.

NAGfor the period May 1, to Octo [Charles H Kruger; Christophe O Laux; United States. National Aeronautics and Space Administration.]. Prior to this work, the radiative emission of air plasmas in the infrared had been the object of few experimental investigations, and although several infrared systems were already modeled in radiation codes such as NEQAIR, measurements were required to validate numerical predictions and indicate whether all transitions of importance were accounted for in the : Christophe O.

Laux and Charles H. Kruger. INVESTIGATION OF INFRA-RED AND ONEQUlLIBRIUM AIR RADIATION Grant No. NAG Prepared for NATIONAL AERONAUTICS AND SPACE ADMINISTRATION For the Period May 1, to Octo Submitted by Charles H.

Details Investigation of infra-red and nonequilibrium air radiation EPUB

Kruger, Principal Investigator Christophe O. Laux, Associate Investigator High Temperature Gasdynamics Laboratory. The experimental results for the excited time of the nonequlibrium radiation and the ionization behind strong shock waves are presented. Using an optical multichannel analyzer, InSb infrared detectors and near-free-molecular Langmuir probes, the infrared radiation, the electron density of air and the nonequlibrium radiation spectra at different moments of the relaxation process in Cited by: 1.

This report describes progress on the first year of a research program on the infrared radiation of air plasmas conducted in the High Temperature Gasdynamics Laboratory at Stanford University. This program is intended to investigate the masking of infrared signatures by the air plasma formed behind the bow shock of high velocity : Charles H.

Kruger. Nonequilibrium infrared emission spectra representative of a Mars atmospheric entry mission are modeled using RADIS, a spectral code for CO and CO 2 based on the HITEMP and CDSD databases.

The modeled experimental data for the free-flow and the forebody radiation were obtained in the JAXA expansion tube by: 2.

Description Investigation of infra-red and nonequilibrium air radiation EPUB

Non-EQuilibrium AIr Radiation (Neqair) is a line-by-line radiation code which computes spontaneous emission, absorption and stimulated emission due to transitions between various energy states of chemical species along a line-of-sight Individual electronic transitions are.

National Aeronautics and Space Administration Entry Systems and Technology Division Ames Research Center. Investigation of Non-Equilibrium Radiation for Earth Entry. Aaron Brandis*, Chris Johnston^ and Brett Cruden*. *AMA Inc at NASA Ames, Moffett Field, California ^NASA Langley, Hampton, Virginia.

Get this from a library. Investigation of infra-red and nonequilibrium air radiation. [Charles H Kruger; United States. National Aeronautics and Space Administration.]. A new computer model, SHARC, has been developed by the Air Force for calculating high-altitude atmospheric IR radiance and transmittance spectra with a resolution of better than 1/cm.

Comprehensive coverage of the 2 to 40 microns (/cm to 5,/cm) wavelength region is provided for arbitrary lines of sight in the km altitude by: [Show full abstract] nonequilibrium and, in the second part, measurements of the rate of recombination of electrons in air, nitrogen, and air/argon plasmas.

These investigations have shown the. Investigation of near and mid infra-red (, & μm) laser propagation through the New York city metro area Paul Corrigan, Rainer Martini, Edward Whittaker, Claire F. Gmachl Electrical Engineering.

Using an optical multichannel analyzer, InSb infrared detectors and near- free-molecular Langmuir probes, the infrared radiation, the electron density of air arid the nonequilibrium radiation. The nonequilibrium radiation phenomenais still not well understood, especially,at high altitudes (> 50 km) and at velocities above km/sec and below km/sec.

Nonequilibrium Radiation Intensity Measurements in Simulated Titan Atmospheres. Visible and Near Infrared Spectroscopy of Hayabusa Re-entry Using Semi-autonomous Tracking. Tim McIntyre, Investigation of Nonequilibrium Radiation for Mars Entry. Aaron Brandis, Cited by: Close Drawer Menu Close Drawer Menu Menu.

Home; Journals. AIAA Journal; Journal of Aerospace Information Systems; Journal of Air Transportation; Journal of Aircraft; Journal of Cited by: Charles H. Kruger.

Stanford University Experimental study and modeling of infrared air plasma radiation. Conference Paper.

Investigation of Infra-Red and Nonequilibrium Air Radiation. Article. In this study, the concept of a nonablative lightweight thermal protection system (NALT) were proposed for a Mars exploration mission currently under investigation in Japan.

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The NALT consists of a carbon/carbon (C/C) composite skin, insulator tiles, and a honeycomb sandwich panel. Shock Layer Radiation Measurements at a Mars Entry Condition for Infrared Thermography.

A Comparison of EAST Shock-Tube Radiation Measurements with a New Air Radiation Model. Christopher Johnston; Investigation of Nonequilibrium Radiation for Mars Entry.

How Infrared Light was Discovered Sir Frederick William Herschel, the accomplished scientist, was born in in modern-day Germany. In addition to numerous astronomical achievements, most notably the discovery of Uranus inhe also contributed significantly to the study of light.

Infrared radiation (IR), sometimes called infrared light, is electromagnetic radiation (EMR) with longer wavelengths than those of visible light, and is therefore generally invisible to the human eye, although IR at wavelengths up to nanometers (nm)s from specially pulsed lasers can be seen by humans under certain conditions.

The aim of the present work is to develop a narrow-band model for air plasmas radiation under chemical and thermal nonequilibrium. Typical conditions of entry or re-entry applications at hypersonic velocities are used to distinguish between optically thin and non-thin electronic systems of diatomic by:   Shock Layer Radiation Measurements at a Mars Entry Condition for Infrared Thermography.

Predictions of nonequilibrium radiation: analysis and comparison with EAST experiments. Experimental investigation of air radiation from behind a strong shock by: Radiation Emitted from Semiconductor Lasers in Strong Magnetic Fields and Under High Hydrostatic Pressures. Methods Used in Far-Infrared Investigations of Excitons in Semiconductors.

Basov. Collective Interactions of Excitons and Nonequilibrium Carriers in Gallium Arsenide and Silicon. Laux, C.O., “Nonequilibrium Radiation of Air and Nitrogen Plasmas,” ESA International Workshop on the Radiation of High Temperature Gases in Atmospheric Entry, Porquerolles, France, September October 1, air in an ion chamber, W/e is ionization potential of air, r is the field dimension, ref is reference field size, and S/ at is the mass collision stopping power ratio of tissue t to air a–30 All of the parameters in Eq.

2 are energy depen-dent; hence, the dose in small fields compared to the refer-File Size: KB. For example, solar radiation reaches the surface of the earth after passing through cold air layers at high altitudes.

Also, the radiation-absorbing surfaces inside a greenhouse reach high temperatures even when its plastic or glass cover remains relatively cool. The theoretical foundation of radiation was established in by physicistFile Size: KB. Gerald E. Miller PhD, in Introduction to Biomedical Engineering (Third Edition), Thermal Radiation.

Thermal radiation is electromagnetic radiation emitted from a material that is due to the heat of the material, the characteristics of which depend on its temperature. An example of thermal radiation is the infrared radiation emitted by a common household radiator or electric heater.

Infrared radiation is of a much lower frequency (and a longer wavelength) than X-rays.Infrared spectroscopy exploits the fact that molecules absorb frequencies that are characteristic of their absorptions occur at resonant frequencies, i.e. the frequency of the absorbed radiation matches the vibrational energies are affected by the shape of the molecular potential energy surfaces, the masses of the atoms, and the associated vibronic coupling.kinetics.

This model provides a basis for modeling nonequilibrium radiation that could be extended in future work to the modeling of the nonequilibrium infrared radiation of air plasmas. 40 NO Fundamental N "L",_ 30 e_,_ OH Fundamental _ NO First Overtone N= C (vl+v3) C02 (v3)._ 0 I ' ' ' 4,5 '' Wavelength [em.