Abstract

A photothermal laser interferometric system is described that has sufficient sensitivity to allow the detection of the hydrazines: hydrazine, monomethylhydrazine, and unsymmetrical dimethylhydrazine at part per billion concentrations. A line tunable CO2 laser excites the trace hydrazine molecules in one arm of a modified Jamin interferometer illuminated with a single frequency He–Ne laser. The CO2 laser beam intersects one of the He–Ne beams in the interferometer at a small angle, so there is no interaction of the IR and visible laser beams at any optical components in the system. The system operates with computer control of interferometer alignment, CO2 excitation laser tuning, and data acquisition.

© 1991 Optical Society of America

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