System and method for isotope ratio analysis and gas detection b

Details System and method for isotope ratio analysis and gas detection b System and method for isotope ratio analysis and gas detection b

1998-09-29

1999-08-31

Larkin, Daniel S.

Measuring and testing

Gas analysis

By vibration

73 2402, G01N 2902

Patent

active

059455926

ABSTRACT:
The system and method are set forth for photoacoustical analysis of isotope and other compounds having telltale absorption wavelenghths between 1700-2500 nm. The system and method includes a Co:Mg F.sub.2, optical parametric oscillator (OPO) or diode laser tunable between 1700-2500 nm which is directed into a sample at energies sufficient to generate detectable acoustical emissions. A microphone detects the emissions for processing and analysis. The system and method is adapted to detect stable isotope compounds such as .sup.13 CO.sub.2 as well as other chemical compounds. For non-gaseous compounds, a CO.sub.2 or diode laser is used to photoablate the gaseous sample containing the suspected compound.

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patent: 5394236 (1995-02-01), Murnick
West et al., "Photoacoustic Spectroscopy", Rev. Sci. Instrum., vol. 54, No. 07, Jul. 1983, pp. 797-817.

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