Method for enhanced evanescent field exposure in an optical fiber resonator for spectroscopic detection and measurement of trace species
First Claim
1. A method for detecting and measuring a trace species in at least one of a sample gas and a sample liquid, the method comprising:
- forming a continuous closed passive optical fiber ring;
forming at least one sensor in the closed passive optical fiber ring by tapering a portion the optical fiber along a length thereof;
exposing the tapered portion of the optic fiber to the sample gas or sample liquid;
emitting radiation from a coherent source;
coupling at least a portion of the radiation emitted from the coherent source into the continuous closed passive fiber optic ring;
receiving a portion of the radiation traveling in the continuous closed passive fiber optic ring; and
determining the level of trace species in the gas or liquid sample based on a rate of decay of the radiation within the continuous closed passive fiber optic ring.
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Abstract
A method for detection and measurement of trace species in a gas or liquid sample is provided. The method comprises forming a sensor from an optical fiber by tapering a portion the optical fiber along a length thereof, exposing the tapered portion of the optic fiber to the sample gas or sample liquid, emitting radiation from a coherent source, coupling at least a portion of the radiation emitted from the coherent source into the fiber optic ring, receiving a portion of the radiation traveling in the fiber optic ring, and determining the level of trace species in the gas or liquid sample based on a rate of decay of the radiation within the fiber optic ring.
31 Citations
8 Claims
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1. A method for detecting and measuring a trace species in at least one of a sample gas and a sample liquid, the method comprising:
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forming a continuous closed passive optical fiber ring; forming at least one sensor in the closed passive optical fiber ring by tapering a portion the optical fiber along a length thereof; exposing the tapered portion of the optic fiber to the sample gas or sample liquid; emitting radiation from a coherent source; coupling at least a portion of the radiation emitted from the coherent source into the continuous closed passive fiber optic ring; receiving a portion of the radiation traveling in the continuous closed passive fiber optic ring; and determining the level of trace species in the gas or liquid sample based on a rate of decay of the radiation within the continuous closed passive fiber optic ring. - View Dependent Claims (2, 3, 4)
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5. A method for detecting and measuring a trace species in at least one of a sample gas and a sample liquid, the method comprising:
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forming a continuous closed passive optical fiber ring; forming at least one sensor in the continuous closed passive optical fiber ring by removing a portion of a cladding of the optical fiber to form a “
D”
shaped cross section;exposing the “
D”
shaped cross section portion of the optic fiber to the sample gas or sample liquid;emitting radiation from a coherent source; coupling at least a portion of the radiation emitted from the coherent source into the continuous closed passive fiber optic ring; receiving a portion of the radiation traveling in the continuous closed passive fiber optic ring; and determining the level of trace species in the gas or liquid sample based on a rate of decay of the radiation within the continuous closed passive fiber optic ring. - View Dependent Claims (6, 7, 8)
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Specification