High sensitivity coherent photothermal interferometric system and method for chemical detection
First Claim
1. A photo-thermal interferometric spectroscopy system that provides information about a chemical at a remote location, comprising:
- a light detector system positioned remote from the chemical, the detector system having two inputs;
a first input receiving a light signal from a local oscillator and a second input receiving a light beam passed through the chemical, an adaptive optics unit to at least partially compensate the light beam degradation caused by atmospheric turbulence in the light beam passed through the chemical, wherein the detector system includes a digital signal processing unit to recover information about 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. An adaptive optics system at least partially compensates the light beam degradation caused by atmospheric turbulence. A focusing system is used to bring together the light passed through the chemical; the focusing system includes a multimode fiber for the light collection, 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
20 Claims
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1. A photo-thermal interferometric spectroscopy system that provides information about a chemical at a remote location, comprising:
- a light detector system positioned remote from the chemical, the detector system having two inputs;
a first input receiving a light signal from a local oscillator and a second input receiving a light beam passed through the chemical, an adaptive optics unit to at least partially compensate the light beam degradation caused by atmospheric turbulence in the light beam passed through the chemical, wherein the detector system includes a digital signal processing unit to recover information about 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)
- a light detector system positioned remote from the chemical, the detector system having two inputs;
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18. A method for determining information about a chemical at a remote location, comprising:
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compensating atmospheric turbulence effects in a light beam passed through the chemical, receiving at least a portion of the light beam passed through the chemical, mixing the portion of the light beam with a local oscillator beam in a coherent receiver; measuring a phase shift of the light beam, the phase shift being indicative of at least one of absorption spectrum and concentration of the chemical. - View Dependent Claims (19, 20)
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Specification