Accession Number:

ADA171471

Title:

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

Descriptive Note:

Final rept. 4 Jan 84-31 Mar 85,

Corporate Author:

SYSTEMS RESEARCH LABS INC DAYTON OH RESEARCH APPLICATIONS DIV

Personal Author(s):

• Grosjean,D. F.
• Goss,L. P.

Report Date:

1985-06-01

Pagination or Media Count:

35.0

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.

Descriptors:

• *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

Subject Categories:

• Lasers and Masers
• Test Facilities, Equipment and Methods
• Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE