Fiber-optic based cavity ring-down spectroscopy apparatus

Details Fiber-optic based cavity ring-down spectroscopy apparatus Fiber-optic based cavity ring-down spectroscopy apparatus

2006-05-16

2006-05-16

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C250S227140, C436S164000

Reexamination Certificate

active

07046362

ABSTRACT:
An apparatus for detection and measurement of trace species in a gas or liquid sample. A ring down cell formed from a fiber optic ring is exposed to the sample gas or liquid. A coherent source emits radiation into the fiber optic ring, which in turn is received at an output thereof. The fiber optic ring has a portion thereof, between the input and output, exposed to the sample gas or sample liquid. A processor is coupled to the receiver and determines the level of trace species in the gas or liquid sample based on the rate of decay of the radiation within the fiber optic ring.

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