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

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