High-Repetition-Rate Temperature Measurement of Laboratory Combustion Flame Beam Deflection.

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Abstract:

Details of a method of obtaining time-resolved measurements of gas temperatures in a combustion environment are given. The noncontact optical laser-beam deflection technique uses rapid heating at a gas-solid interface as an acoustic source and is capable of acquiring localized temperature values at a repetition rate of 1 kHz. Measurements taken on a premixed propane-air laboratory flame show a 12.5-Hz thermal oscillation at the flame edge and no significant oscillation at the center. Two signal-processing approaches are described 1 digitization and recording of the entire signal and subsequent digital processing, and 2 electronic detection of the signal peak, accompanied by real-time processing of the time difference.

Author(s):
Grosjean, D. F. ; Goss, L. P.
Author Organization(s):
SYSTEMS RESEARCH LABS INC DAYTON OH RESEARCH APPLICATIONS DIV
Descriptive Note:
Final rept. 4 Jan 84-31 Mar 85,
Pagination:
0035

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SRL-6817, AFWAL-TR-86-2051
Contract/Grant Number(s):
F33615-81-C-2013
Task Number(s):
S1
Project Number(s):
2301
Monitor Series:
TR-86-2051
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.3.2_Personnel Management
Modernization Areas:
Directed Energy
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*COMBUSTION, *FLAMES, SIGNAL PROCESSING, PEAK VALUES, HIGH RATE, REPETITION RATE, REAL TIME, AIR, DEFLECTION, LASER BEAMS, LABORATORY PROCEDURES, DIAGNOSTIC EQUIPMENT, HOT GASES, PROPANE, TEMPERATURE MEASURING INSTRUMENTS, PHOTOTHERMAL PROPERTIES
Field(s)/Group(s):
Lasers and Masers, Test Facilities, Equipment and Methods, Combustion and Ignition
Keyword(s):
Optoacoustics, Combustion diagnostics, PTDS(Photothermal Deflection Spectroscopy), High repetition rate lasers
Report Date:
1985 Jun 01