TDLAS architecture for widely spaced wavelengths
First Claim
1. A system for widely spaced wavelength tunable diode laser absorption spectroscopy comprising:
- at least a first and second tunable diode laser, the first tunable diode laser generating laser light at a first wavelength, the second tunable diode laser generating laser light at a second wavelength, wherein laser light of the first and second wavelengths cannot co-propagate in a single transverse mode with simultaneously high efficiency on a single-mode fiber;
a first fiber having a proximal end and a distal end, the first fiber optically coupled to the first tunable diode laser at the proximal end, the first fiber being a single mode optical fiber configured to carry light in the first wavelength;
a second fiber having a proximal end and a distal end, the second fiber optically coupled to the second tunable diode laser at the proximal end, the second fiber being a single mode optical fiber configured to carry light in the second wavelength;
a fiber bundle comprising the distal ends of at least the first and second fibers, wherein the distal ends of the first and second fibers are stripped of their respective coatings, and wherein a first fiber optic core of the first fiber and a second fiber optic core of the second fiber are arranged with their claddings adjacent to each other forming a bundled configuration;
one or more pitch heads comprising a transmitting optic, the transmitting optic optically coupled to the first and second tunable diode lasers via the distal ends of the first and second fibers of the fiber bundle, the pitch head configured to project respective beams of laser light from the first fiber optic core and the second fiber optic core, wherein the pitch head is oriented to project the respective beams from each of the first and second fiber optic cores through a measurement zone;
one or more sensors, each sensor comprising respectively at least one photodetector, each of the at least one photodetector configured to detect an optical power of light in the first and second wavelengths; and
one or more catch heads located across the measurement zone by a select distance from the one or more pitch heads, each of the one or more catch heads in optical communication with a respective pitch head of the one or more pitch head to receive the respective beams of the first and second fiber optic cores and direct the respective beams onto at least one of the one or more sensors.
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Accused Products
Abstract
A system for widely spaced wavelength tunable diode laser absorption spectroscopy includes at least a first and second tunable diode laser generating laser light at a first and second wavelength, wherein laser light of the first and second wavelengths cannot co-propagate efficiently on the same single-mode fiber. A first fiber may be configured to carry light in the first wavelength, and a second fiber configured to carry light in the second wavelength. A fiber bundle may be formed from the distal ends of the first and second fibers stripped of their respective coatings, and arranged with their claddings adjacent to each other. One or more pitch heads are configured to project respective beams of laser light from the fiber bundle through a measurement zone. One or more catch heads located across the measurement zone receive the respective beams and direct the respective beams onto at least one sensor.
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Citations
20 Claims
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1. A system for widely spaced wavelength tunable diode laser absorption spectroscopy comprising:
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at least a first and second tunable diode laser, the first tunable diode laser generating laser light at a first wavelength, the second tunable diode laser generating laser light at a second wavelength, wherein laser light of the first and second wavelengths cannot co-propagate in a single transverse mode with simultaneously high efficiency on a single-mode fiber; a first fiber having a proximal end and a distal end, the first fiber optically coupled to the first tunable diode laser at the proximal end, the first fiber being a single mode optical fiber configured to carry light in the first wavelength; a second fiber having a proximal end and a distal end, the second fiber optically coupled to the second tunable diode laser at the proximal end, the second fiber being a single mode optical fiber configured to carry light in the second wavelength; a fiber bundle comprising the distal ends of at least the first and second fibers, wherein the distal ends of the first and second fibers are stripped of their respective coatings, and wherein a first fiber optic core of the first fiber and a second fiber optic core of the second fiber are arranged with their claddings adjacent to each other forming a bundled configuration; one or more pitch heads comprising a transmitting optic, the transmitting optic optically coupled to the first and second tunable diode lasers via the distal ends of the first and second fibers of the fiber bundle, the pitch head configured to project respective beams of laser light from the first fiber optic core and the second fiber optic core, wherein the pitch head is oriented to project the respective beams from each of the first and second fiber optic cores through a measurement zone; one or more sensors, each sensor comprising respectively at least one photodetector, each of the at least one photodetector configured to detect an optical power of light in the first and second wavelengths; and one or more catch heads located across the measurement zone by a select distance from the one or more pitch heads, each of the one or more catch heads in optical communication with a respective pitch head of the one or more pitch head to receive the respective beams of the first and second fiber optic cores and direct the respective beams onto at least one of the one or more sensors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pitch head for widely spaced wavelength tunable diode laser absorption spectroscopy comprising:
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a housing configured to optically couple with a fiber bundle, the fiber bundle comprising distal ends of at least a first and second input fibers, wherein the first input fiber is a single mode fiber that carries laser light at a first wavelength and the second input fiber is a single-mode fiber that carries laser light at a second wavelength, wherein laser light of the first and second wavelengths cannot co-propagate in a single transverse mode with simultaneously high efficiency on a single-mode fiber; wherein the distal ends of at least the first and second input fibers are stripped of their respective coatings, and wherein a first fiber optic core of the first input fiber, and a second fiber optic core of the second input fiber are arranged with their claddings adjacent to each other forming a bundled configuration; and a transmitting optic configured to project respective beams of laser light from each of the at least first and second fiber optic cores, through a measurement zone; wherein the housing is oriented such that the respective beams reach a catch head located across the measurement zone a select distance from the housing. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for widely spaced wavelength tunable laser diode laser spectroscopy comprising:
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generating a first laser beam of a first wavelength; generating a second laser beam of a second wavelength; carrying the first laser beam on a first single-mode optical fiber and the second laser beam on a second single-mode optical fiber, wherein laser light of the first and second wavelengths cannot co-propagate in a single transverse mode with simultaneously high efficiency on a single-mode fiber; stripping distal ends of the first and second single-mode optical fiber of their respective coatings; arranging a first fiber optic core of the first single-mode optical fiber with its cladding adjacent to the cladding of a second fiber optic core of the second single-mode optical fiber forming a bundled configuration; forming a fiber bundle from the bundled configuration of the first and second fiber optic cores; transmitting, with a pitch head, respective beams of laser light, from each of the first and second fiber optic cores of the fiber bundle, through a measurement zone; receiving each respective beam at a catch head located across the measurement zone a select distance from the pitch head; detecting, at the catch head, an optical power of light in each of the first and second wavelengths; and determining a concentration of targeted species having an absorption line at the first and second wavelengths. - View Dependent Claims (18, 19, 20)
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Specification