Fiber-optic based cavity ring-down spectroscopy apparatus
First Claim
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1. An apparatus for detection and measurement of trace species in at least one of a sample gas and/or a sample liquid comprising:
- a closed passive fiber optic ring having a portion thereof exposed to the sample gas and/or sample liquid;
a coherent source of radiation;
coupling means for i) introducing a portion of the radiation emitted by the coherent source to the closed passive fiber optic ring and ii) receiving a portion of the radiation resonant in the closed passive fiber optic ring;
a detector for detecting a level of the radiation received by the coupling means and generating a signal responsive thereto; and
a processor coupled to the detector for determining a level of the trace species in the gas sample and/or liquid sample based on the signal generated by the detector.
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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.
48 Citations
56 Claims
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1. An apparatus for detection and measurement of trace species in at least one of a sample gas and/or a sample liquid comprising:
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a closed passive fiber optic ring having a portion thereof exposed to the sample gas and/or sample liquid; a coherent source of radiation; coupling means for i) introducing a portion of the radiation emitted by the coherent source to the closed passive fiber optic ring and ii) receiving a portion of the radiation resonant in the closed passive fiber optic ring; a detector for detecting a level of the radiation received by the coupling means and generating a signal responsive thereto; and a processor coupled to the detector for determining a level of the trace species in the gas sample and/or liquid sample based on the signal generated by the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. An apparatus for detection and measurement of trace species in at least one of a sample gas and/or a sample liquid comprising:
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a closed passive resonant fiber optic ring having a portion exposed to the sample gas or sample liquid; a coherent source emitting radiation; a first optical coupler to provide at least a portion of the radiation emitted by the coherent source to a first section of the closed passive resonant fiber ring; at least one cylindrical body coupled to a portion of the exposed fiber optic ring to form the portion of the exposed fiber optic ring with a predetermined radius, at least a portion of the sample liquid and/or sample gas contacting the formed portion of the closed fiber optic ring; a second optical coupler for receiving a portion of the radiation in the closed passive resonant fiber ring from a second section of the closed resonant fiber ring; and a processor coupled to the second optical coupler for determining a level of the trace species in the gas an/or liquid sample based on a rate of decay of the radiation received by the second optical coupler. - View Dependent Claims (49, 50, 51, 52)
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53. A method for detecting and measuring a trace species in at least one of a sample gas and/or a sample liquid, the method comprising:
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exposing a portion of an optic fiber of a closed passive fiber optic ring to the sample gas and/or sample liquid; emitting radiation from a coherent source; coupling at least a portion of the radiation emitted from the coherent source into the closed passive fiber optic ring; receiving a portion of the radiation traveling in the closed passive fiber optic ring; and determining the level of trace species in the gas and/or liquid sample based on a rate of decay of the radiation within the closed passive fiber optic ring. - View Dependent Claims (54, 55, 56)
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Specification