Cavity enhanced trace gas detection gradiometer

Details Cavity enhanced trace gas detection gradiometer Cavity enhanced trace gas detection gradiometer

2008-10-07

2011-10-18

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S439000, C356S440000, C356S338000

Reexamination Certificate

active

08040518

ABSTRACT:
A method and device for measuring trace levels of particles in an air sample is described. A device operating in a gradiometer configuration with two cavities built from a monolithic structure and utilizing a single probe laser, provides common mode subtraction of acoustic, vibrational, laser intensity and other noise sources, which allows sensitivity more closely approaching the quantum limit. Differential measurements between the two cavities occur simultaneously, which reduces errors due to cavity drift. Absorptive gradiometry can therefore provide noise immune detection for trace gasses, including broad linewidth absorbers where frequency-noise immune schemes are not practical. Differential measurements can be used for background subtraction, sensing vapor plume gradients and determining vapor plume propagation direction.

REFERENCES:
patent: 5528040 (1996-06-01), Lehmann
patent: 6094267 (2000-07-01), Levenson et al.
patent: 6781696 (2004-08-01), Rosenberger et al.
patent: 7113286 (2006-09-01), Yan
patent: 2006/0192967 (2006-08-01), Kluczynski

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