Nonresonant Referenced Laser-Induced Thermal Acoustics Thermometry in Air
Abstract
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% ( 2 ). The advantages of using a reference LITA channel are discussed.
- Publication:
-
Applied Optics
- Pub Date:
- January 1999
- DOI:
- 10.1364/AO.38.000577
- Bibcode:
- 1999ApOpt..38..577H