Coherent photothermal interferometric spectroscopy system and method for chemical sensing
First Claim
1. A photo-thermal, interferometric spectroscopy system that provides information about a chemical at a remote location, comprising:
- a first light source assembly that emits a first beam, the first beam having one or more wavelengths that interact with the chemical and change a refractive index of the chemical;
a second laser that produces a second beam, the second beam interacting with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical; and
a detector system positioned remote from the chemical to receive at least a portion of the third beam, the detector system providing information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical.
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Abstract
A photo-thermal, interferometric spectroscopy system is disclosed that provides information about a chemical at a remote location. A first light source assembly is included that emits a first beam. The first beam has one or more wavelengths that interact with the chemical and change a refractive index of the chemical. A second laser produces a second beam. The second beam interacts with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical. A detector system is positioned remote from the chemical to receive at least a portion of the third beam. The detector system provides information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical.
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Citations
74 Claims
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1. A photo-thermal, interferometric spectroscopy system that provides information about a chemical at a remote location, comprising:
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a first light source assembly that emits a first beam, the first beam having one or more wavelengths that interact with the chemical and change a refractive index of the chemical;
a second laser that produces a second beam, the second beam interacting with the chemical resulting in a third beam with a phase change that corresponds with the change of the refractive index of the chemical; and
a detector system positioned remote from the chemical to receive at least a portion of the third beam, the detector system providing information on a phase change in the third beam relative to the second beam that is indicative of at least one of, absorption spectrum and concentration of the chemical. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 69, 70)
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47. A method for determining information about a chemical at a remote location, comprising:
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directing a first beam to a remote location where a chemical is present, the first beam having one or more wavelengths that interact with the chemical and changing a refractive index of the chemical;
directing a second beam that interacts with the chemical, forming a third beam having a phase change relative to the second beam that corresponds with a change of a refractive index of the chemical;
receiving at least a portion of the third beam at a detection system positioned remote from the chemical; and
measuring a phase shift of the third beam that is induced by the first beam and is indicative of at least one of, absorption spectrum and concentration of the chemical. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 71, 72, 73)
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74. Another embodiment of the method 19, wherein the second beam includes of least a first branch and a second branch, the first branch being directed into a volume that contains the chemical and the second beam is directed to a position external to the chemical.
Specification