Abstract
A spectrophone measures absorptivity by sensing thermal expansion in a confined sample gas. Laser source excitation provides sufficient radiation to measure precisely very weak absorptivities at laser wavelengths. This paper describes the theoretical capability, design considerations, and experimental testing of a pulsed ruby laser absorptivity spectrophone and a cw CO2 laser absorptivity spectrophone. A spectrum of the water vapor line at 6943.8 Å was obtained. The peak absorptivity was 3 × 10−6 cm−1. In the vicinity of 9.6 μ, absorptivities of CO2−N2 mixtures were measured down to 1.2 × 10−7cm−1.
© 1968 Optical Society of America
Full Article | PDF ArticleMore Like This
Stuart A. Schleusener, James D. Lindberg, Kenneth O. White, and Ronald L. Johnson
Appl. Opt. 15(10) 2546-2550 (1976)
D. H. Leslie and G. L. Trusty
Appl. Opt. 20(11) 1941-1947 (1981)
J. C. Peterson, M. E. Thomas, R. J. Nordstrom, E. K. Damon, and R. K. Long
Appl. Opt. 18(6) 834-841 (1979)