Accession Number : ADA187885
Title : Evaluation of a Temperature Remote Sensing Technique.
Descriptive Note : Technical memo.,
Corporate Author : JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
Personal Author(s) : Gearhart, S A ; Thomas, M E
PDF Url : ADA187885
Report Date : Jul 1987
Pagination or Media Count : 29
Abstract : A noninvasive technique for measuring temperature in hot gases is evaluated as an alternative to conventional mechanical probing techniques. The technique uses a diode laser spectrometer to measure the line-center absorption coefficient ratio of two absorption lines that originate from different vibrational energy levels of the same absorbing species. The temperature is calculated without knowledge of the pressure, absorber concentration, or optical path length. A previous study demonstrated temperature measurements at about 200K at atmospheric pressure. The results of this evaluation suggest that the technique is also applicable for temperatures as low as 400 K and at pressures well below 1 atm. Keywords: Temperature measuring instruments; Combustion diagnostics; Laser absorption techniques.
Descriptors : *ABSORPTION SPECTRA, *COMBUSTION, *REMOTE DETECTORS, *TEMPERATURE MEASURING INSTRUMENTS, *LASER APPLICATIONS, *COLLISION BROADENING, DIAGNOSIS(GENERAL), HOT GASES, LENGTH, LINE SPECTRA, MEASUREMENT, MOLECULAR ENERGY LEVELS, MOLECULAR VIBRATION, OPTICS, PATHS, SPECTROMETERS, THERMAL PROPERTIES, LASER BEAMS, SEMICONDUCTOR LASERS, SEMICONDUCTOR DIODES
Subject Categories : Test Facilities, Equipment and Methods
Lasers and Masers
Combustion and Ignition
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE