Tunable Diode Laser Absorption Technique for Multi-Parameter Measurements of Combustion Flows,

reportActive / Technical Report | Accession Number: ADP009017 | Need Help?

Abstract:

A tunable diode laser diagnostic based spectrally resolved laser absorption has been developed to detect water vapor. The system uses a distributed feedback InGaAsP diode laser, emitting around 1.385 micrometer. The diode laser is tuned in wavelength by modulating its driving current at frequencies up to 5 KHz Temperatures, concentrations and pressures are inferred from the directly measured absorption spectra. Velocity is derived from the Doppler shift of these absorption spectra. The technique has been demonstrated for multiple-parameter measurements of the water vapor present in laboratory room air, in the postflame gases above a methane-air flat fame burner and in the high speed unidimensional transient flows generated in a shock tube. The results agree well with the calculated valves and independent measurements. Author

Author(s):
Arroyo, M. P. ; Hanson, R. K.
Author Organization(s):
STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING
Supplementary Note:
This article is from 'International Symposium on Applications of Laser Techniques to Fluid Mechanics and Workshop on Computers in Flow Measurements (6th) Held in Lisbon, Portugal on July 20-23, 1992', AD-A258 510, p28.1.1-28.1.6.
Pagination:
0006

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
R/D
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*WATER VAPOR, *GAS DYNAMIC LASERS, *ABSORPTION SPECTRA, COMBUSTION, METHANE, AIR WATER INTERACTIONS, CONCENTRATION(COMPOSITION), PRESSURE DISTRIBUTION, TEMPERATURE GRADIENTS, SHOCK TUBES, GAS FLOW, FIBER OPTICS, RESOLUTION, OPTICAL IMAGES, EXPERIMENTAL DATA, COMPARISON
Field(s)/Group(s):
Fluid Mechanics, Lasers and Masers
Keyword(s):
Component Reports
Report Date:
1992 Jul 23