We report a detailed investigation of nonresonant laser-induced thermal acoustics (LITA) for the single-shot measurement of the speed of sound (v S ) in an oven containing room air. A model for the speed of sound that includes important acoustic relaxation effects is used to convert the speed of sound into temperature. A reference LITA channel is used to reduce uncertainties in v S . Comparing thermocouple temperatures with temperatures deduced from our v S measurements and model, we find the mean temperature difference from 300 to 650 K to be 1% (±2σ). The advantages of using a reference LITA channel are discussed.
© 1999 Optical Society of America
Original Manuscript: July 22, 1998
Revised Manuscript: September 28, 1998
Published: January 20, 1999
Roger C. Hart, R. Jeffrey Balla, and Gregory C. Herring, "Nonresonant referenced laser-induced thermal acoustics thermometry in air," Appl. Opt. 38, 577-584 (1999)