Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1998-11-10
1999-11-16
Kim, Robert H.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356136, 356244, 356445, G01N 2100
Patent
active
059867680
ABSTRACT:
An optical cavity resonator device is provided for conducting sensitive murement of optical absorption by matter in any state with diffraction-limited spatial resolution through utilization of total internal reflection within a high-Q (high quality, low loss) optical cavity. Intracavity total reflection generates an evanescent wave that decays exponentially in space at a point external to the cavity, thereby providing a localized region where absorbing materials can be sensitively probed through alteration of the Q-factor of the otherwise isolated cavity. When a laser pulse is injected into the cavity and passes through the evanescent state, an amplitude loss resulting from absorption is incurred that reduces the lifetime of the pulse in the cavity. By monitoring the decay of the injected pulse, the absorption coefficient of manner within the evanescent wave region is accurately obtained from the decay time measurement.
REFERENCES:
patent: 4571085 (1986-02-01), Anderson
patent: 4793709 (1988-12-01), Jabr et al.
patent: 5437840 (1995-08-01), King et al.
patent: 5528040 (1996-06-01), Lehmann
Kim Robert H.
The United States of America as represented by the Secretary of
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