We report a detailed investigation of nonresonant laser-induced thermal acoustics (LITA) for the single-shot measurement of the speed of sound (<i>v</i><sub><i>S</i></sub>) 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 <i>v</i><sub><i>S</i></sub>. Comparing thermocouple temperatures with temperatures deduced from our <i>v</i><sub><i>S</i></sub> 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
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)