Non-perturbing beam deflection system and method for high repetition rate temperature measurement of combustion flames

Patent · Tue Apr 07 00:00:00 EDT 1987

OSTI ID:6628531

Goss, L P; Grosjean, D F; Sarka, B; Kizirnis, S W; Ganguly, B N

A method is described for determining the temperature of a combustion flame of known composition comprising: a. supporting a thin wire at a preselected position within the flame, the wire selected to rapidly couple-energy to the immediately surrounding gases of the flame when the wire is heated; b. directing a first pulsed laser beam onto the wire to produce localized heating of the wire and the immediately surrounding gases of the flame whereby a pressure increase in the form of an acoustic pulse is generated within the flame; c. directing parallel second and third laser beams through the flame in predetermined spaced relationship to each other and to the wire; d. detecting the respective deflections of the second and third laser beams resulting from interactions thereof with the acoustic pulse; e. measuring the time difference between respective deflections of the second and third laser beams to determine the speed of the acoustic pulse through the flame; and f. determining the temperature of the flame from the speed determination and the predetermined spaced relationship between the second and third laser beam.

• Assignee: Secretary of the Air Force, Washington, DC
• Patent Number(s): US 4655608
• OSTI ID: 6628531
• Resource Relation: Patent File Date: Filed date 24 Oct 1985
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
TEMPERATURE MEASUREMENT
COMBUSTION KINETICS
COMBUSTION PRODUCTS
FLAME PROPAGATION
GASES
HEATING
LASER RADIATION
PRESSURE CONTROL
PULSE TECHNIQUES
SOUND WAVES
SPACE DEPENDENCE
TIME MEASUREMENT
WIRES
CHEMICAL REACTION KINETICS
CONTROL
ELECTROMAGNETIC RADIATION
FLUIDS
KINETICS
RADIATIONS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry