Multipass optical device and process for gas and analyte determination
First Claim
Patent Images
1. A multipass optical device, characterized by:
- a torus structure that defines an optical cavity that includes at least one seamless ring mirror with a surface of revolution along the circumference that is rotationally symmetric with no defined optical axis, said at least one ring mirror provides optical power that propagates light introduced to said cavity in at least a radial direction and an axial direction such that it is optically continuous at all locations on the face thereof, defining a multipass optical path of a predefined path length.
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Abstract
A torus multipass optical device and method are described that provide for trace level determination of gases and gas-phase analytes. The torus device includes an optical cavity defined by at least one ring mirror. The mirror delivers optical power in at least a radial and axial direction and propagates light in a multipass optical path of a predefined path length.
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Citations
43 Claims
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1. A multipass optical device, characterized by:
a torus structure that defines an optical cavity that includes at least one seamless ring mirror with a surface of revolution along the circumference that is rotationally symmetric with no defined optical axis, said at least one ring mirror provides optical power that propagates light introduced to said cavity in at least a radial direction and an axial direction such that it is optically continuous at all locations on the face thereof, defining a multipass optical path of a predefined path length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for determination of a gas or a gas-phase analyte, comprising:
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introducing a gas or a gas-phase analyte into an optical device comprising a torus structure that defines an optical cavity that includes at least one seamless ring mirror with a surface of revolution along the circumference that is rotationally symmetric with no defined optical axis, said at least one ring mirror provides optical power that propagates light introduced to said cavity in at least a radial direction and an axial direction such that it is optically continuous at all locations on the face thereof, defining a multipass optical path of a predefined path length; introducing light into said optical cavity at a preselected launch angle and preselected wavelength, said gas or said gas-phase analyte absorbs light at a wavelength characteristic for said gas or said gas-phase analyte; measuring an absorption signal for said gas or said gas-phase analyte; and determining said gas or said gas-phase analyte. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. In a system, a torus multipass optical device, comprising:
a torus structure that defines an optical cavity that includes at least one seamless ring mirror with a surface of revolution along the circumference that is rotationally symmetric with no defined optical axis, said at least one ring mirror provides optical power that propagates light introduced to said cavity in at least a radial direction and an axial direction such that it is optically continuous at all locations on the face thereof, defining a multipass optical path of a predefined path length. - View Dependent Claims (40, 41, 42, 43)
Specification