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US 2010/0150497 A1Published application
Evanescent sensor using a hollow-core ring mode waveguide
AssigneeWeatherford/Lamb, Inc.
InventorsDOMINO TAVERNER, Edward M. Dowd
Life of this patent
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Abstract
Method and apparatus enable optical evanescent sensing utilizing a waveguide with an annular core. The annular core can provide detectable sensitivity to a measurand due to optical interactions with contents along an inside surface of the annular core since optical properties of the contents vary with changes in the measurand.
Claims20
A method of measuring a parameter, comprising:
- providing a sensor element having an annular core;
- subjecting the sensor element to an environment of the parameter thereby causing a change in optical properties adjacent an inner surface of the annular core, wherein the change is based on the parameter and alters a response signal;
- and
- detecting the response signal to assess the parameter.
1 more element
An optical sensor element for measuring a parameter, comprising:
- a hollow-core ring mode waveguide section having an annular core with an inner surface defining an interior volume;
- and
- first and second collapsed end sections sealing the interior volume of the hollow-core ring mode waveguide section, wherein each of the collapsed end sections transitions from the hollow-core ring mode waveguide section and includes a solid core.
An optical sensing apparatus for measuring at least one parameter, comprising:
- a first optical sensor element, comprising:
- a hollow-core ring mode waveguide section having an annular core with an inner surface defining an interior volume;
- and
- first and second collapsed end sections sealing the interior volume of the hollow-core ring mode waveguide section, wherein each of the collapsed end sections transitions from the hollow-core ring mode waveguide section and includes a solid core;
- and
- a second optical sensor element coupled to the second collapsed end section such that at least a portion of incoming light received at the first collapsed end section of the first optical sensor element passes through to the second optical sensor element.
3 more elements
Dependencies are inferred from the claim text.