Sensing device having a large diameter D-shaped optical waveguide
First Claim
1. A method for fabricating an optical sensor for sensing a measurand, comprising:
- providing an optical waveguide having at least one core and a cladding surrounding the at least one core for propagating light; and
removing a portion of the cladding to form a D-shaped portion in the optical waveguide, such that the D-shaped portion has a generally D-shaped cross-section and that a property of the D-shaped portion changes in response to the measurand, wherein the property comprises at least one of polarization or birefringence.
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Accused Products
Abstract
An optical sensor formed from an optical waveguide having at least one core surrounded by a cladding and a large diameter generally D-shaped portion is disclosed. Axial or compressive strain across the D-shaped cross section may be determined by measuring the change in polarization or birefringence of the light output from the sensor. A layer responsive to a parameter may be disposed on a flat portion of the D-shaped portion of the sensor. The refractive index of the layer changes and/or the layer applies a strain on the sensor in response to the parameter. Changes in the refractive index of the layer alters the light output from the sensor, which is measured over time and correlated to the parameter.
17 Citations
26 Claims
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1. A method for fabricating an optical sensor for sensing a measurand, comprising:
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providing an optical waveguide having at least one core and a cladding surrounding the at least one core for propagating light; and removing a portion of the cladding to form a D-shaped portion in the optical waveguide, such that the D-shaped portion has a generally D-shaped cross-section and that a property of the D-shaped portion changes in response to the measurand, wherein the property comprises at least one of polarization or birefringence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting a parameter using an optical sensor, comprising:
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transmitting light through the optical sensor; exposing a D-shaped portion of the optical sensor to the parameter, wherein the D-shaped portion provides a change in one or more properties of the light transmitted through the optical sensor in response to the parameter, wherein the one or more properties comprise at least one of polarization or birefringence; and detecting the one or more properties of the light transmitted through the optical sensor as a measure of the parameter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical sensor for sensing a measurand, comprising:
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an optical waveguide having an outer cladding and at least one inner core disposed therein which propagates light; and a D-shaped portion of the optical waveguide having a generally D-shaped cross-section, wherein at least one of polarization or birefringence of the D-shaped portion changes in response to the measurand. - View Dependent Claims (19, 20)
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21. An optical sensor for sensing a measurand, comprising:
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a first D-shaped waveguide having a generally D-shaped cross-section; and a second D-shaped waveguide having a generally D-shaped cross-section, wherein the first and second D-shaped waveguides are optically coupled together and wherein polarization or birefringence of at least one of the first and second D-shaped waveguides changes in response to the measurand. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification