Evanescent wave downhole fiber optic spectrometer
First Claim
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1. An apparatus for estimating a property of a fluid downhole, the apparatus comprising:
- a waveguide that receives electromagnetic energy emitted from a source of electromagnetic energy, the waveguide comprising a core portion configured to communicate electromagnetically with the fluid and an unclad portion configured to contact the fluid; and
a detector configured to receive a resultant signal from the core portion, the resultant signal being used at least in part for estimating the property;
wherein the waveguide comprises at least one of a thin film waveguide and a photonic wire waveguide.
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Abstract
An apparatus for estimating a property of a fluid downhole, is provided an includes: an optical fiber that receives light emitted from a light source and including an unclad portion adapted for contacting the fluid; a photodetector for receiving optical signals from the portion; and a spectrometer for obtaining an evanescent spectrum of the fluid from the portion. A method and a system are included.
45 Citations
21 Claims
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1. An apparatus for estimating a property of a fluid downhole, the apparatus comprising:
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a waveguide that receives electromagnetic energy emitted from a source of electromagnetic energy, the waveguide comprising a core portion configured to communicate electromagnetically with the fluid and an unclad portion configured to contact the fluid; and a detector configured to receive a resultant signal from the core portion, the resultant signal being used at least in part for estimating the property; wherein the waveguide comprises at least one of a thin film waveguide and a photonic wire waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for estimating a property of a fluid downhole, the method comprising:
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receiving electromagnetic energy from a source of electromagnetic energy with a waveguide comprising a core portion configured to communicate electromagnetically with the fluid and an unclad portion configured to contact the fluid; at least partially contacting the unclad portion in the fluid downhole; detecting a resultant signal from the core portion; and estimating the property using at least in part the resultant signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system for estimating a property of a fluid downhole, the system comprising:
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at least one source of electromagnetic energy for inputting electromagnetic energy to a waveguide comprising a core portion configured to communicate electromagnetically with the fluid and an unclad portion configured to contact the fluid, wherein the waveguide comprises at least one of a thin film waveguide and a photonic wire waveguide; a detector configured to receive a resultant signal from the core portion; an electronics unit configured to receive the resultant signal and to estimate the property using at least in part the resultant signal. - View Dependent Claims (20, 21)
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Specification