Light-based spectroscopy with improved signal-to-noise ratio
First Claim
1. A measurement system comprising:
- a light source configured to generate an output optical beam, comprising;
a plurality of semiconductor sources configured to generate an input optical beam;
a multiplexer configured to receive at least a portion of the input optical beam and to form an intermediate optical beam;
one or more fibers configured to receive at least a portion of the intermediate optical beam and to form the output optical beam;
wherein at least a portion of the one or more fibers comprises a fused silica fiber;
wherein the output optical beam comprises one or more optical wavelengths; and
wherein the output optical beam is modulated at a modulation frequency;
a light beam set-up comprising a monochromator configured to receive at least a portion of the output optical beam and to form a filtered optical beam;
a measurement apparatus configured to receive a received portion of the filtered optical beam and to deliver a delivered portion of the filtered optical beam to a sample; and
a receiver configured to receive at least a portion of a spectroscopy output beam from the sample that is generated by the delivered portion of the filtered optical beam, wherein the receiver is further configured to use a lock-in technique that detects the modulation frequency, and wherein the receiver is further configured to;
generate a first signal in response to light received while the light source is off; and
generate a second signal in response to light received while the light source is on;
wherein the measurement system is configured to improve a signal-to-noise ratio of the spectroscopy output beam by differencing the first signal and the second signal; and
wherein the receiver is further configured to process the at least a portion of the spectroscopy output beam to generate an output signal, wherein the receiver processing includes at least in part using chemometrics or multivariate analysis to permit identification of materials within the sample; and
wherein the output signal is based at least in part on a chemical composition of the sample.
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Abstract
A measurement system includes a light source having semiconductor sources, a multiplexer, and one or more fused silica fibers configured to form an output optical beam having one or more optical wavelengths modulated at a modulation frequency. A light beam set-up includes a monochromator forming a filtered optical beam. A measurement apparatus delivers the filtered optical beam to a sample. A receiver receives a spectroscopy output beam generated from the sample by the filtered optical beam. The receiver is configured to use a lock-in technique that detects the modulation frequency, and to generate first and second signals responsive to light received while the light source is off and on, respectively. The measurement system improves a signal-to-noise ratio of the spectroscopy output beam by differencing the first and second signals. The receiver processes the spectroscopy output beam using chemometrics or multivariate analysis to permit identification of materials within the sample.
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Citations
20 Claims
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1. A measurement system comprising:
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a light source configured to generate an output optical beam, comprising; a plurality of semiconductor sources configured to generate an input optical beam; a multiplexer configured to receive at least a portion of the input optical beam and to form an intermediate optical beam; one or more fibers configured to receive at least a portion of the intermediate optical beam and to form the output optical beam; wherein at least a portion of the one or more fibers comprises a fused silica fiber; wherein the output optical beam comprises one or more optical wavelengths; and wherein the output optical beam is modulated at a modulation frequency; a light beam set-up comprising a monochromator configured to receive at least a portion of the output optical beam and to form a filtered optical beam; a measurement apparatus configured to receive a received portion of the filtered optical beam and to deliver a delivered portion of the filtered optical beam to a sample; and a receiver configured to receive at least a portion of a spectroscopy output beam from the sample that is generated by the delivered portion of the filtered optical beam, wherein the receiver is further configured to use a lock-in technique that detects the modulation frequency, and wherein the receiver is further configured to; generate a first signal in response to light received while the light source is off; and generate a second signal in response to light received while the light source is on; wherein the measurement system is configured to improve a signal-to-noise ratio of the spectroscopy output beam by differencing the first signal and the second signal; and wherein the receiver is further configured to process the at least a portion of the spectroscopy output beam to generate an output signal, wherein the receiver processing includes at least in part using chemometrics or multivariate analysis to permit identification of materials within the sample; and wherein the output signal is based at least in part on a chemical composition of the sample. - View Dependent Claims (2, 3, 4)
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5. A measurement system comprising:
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a light source configured to generate an output optical beam, comprising; a plurality of semiconductor sources configured to generate an input optical beam; a multiplexer configured to receive at least a portion of the input optical beam and to form an intermediate optical beam; one or more fibers configured to receive at least a portion of the intermediate optical beam and to form the output optical beam; wherein at least a portion of the one or more fibers comprises a fused silica fiber; wherein the output optical beam comprises one or more optical wavelengths; and wherein the output optical beam is modulated at a modulation frequency; a light beam set-up configured to receive at least a portion of the output optical beam and to form a filtered optical beam; a measurement apparatus configured to receive a received portion of the filtered optical beam and to deliver a delivered portion of the filtered optical beam to a sample; and a receiver configured to receive at least a portion of a spectroscopy output beam generated from the sample by the delivered portion of the filtered optical beam, wherein the receiver is further configured to use a lock-in technique that detects the modulation frequency, and wherein the receiver is further configured to; generate a first signal in response to light received while the light source is off; and generate a second signal in response to light received while the light source is on; wherein the measurement system is configured to improve a signal-to-noise ratio of the spectroscopy output beam by differencing the first signal and the second signal; wherein the receiver is further configured to process the at least a portion of the spectroscopy output beam to generate an output signal, wherein the receiver processing includes at least in part using chemometrics or multivariate analysis to permit identification of materials within the sample; and wherein the light source and the receiver are remote from the sample. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A measurement system comprising:
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a light source configured to generate an output optical beam, comprising; a plurality of semiconductor sources configured to generate an input optical beam; a multiplexer configured to receive at least a portion of the input optical beam and to form an intermediate optical beam; one or more fibers configured to receive at least a portion of the intermediate optical beam and to form the output optical beam; wherein at least a portion of the one or more fibers comprises a fused silica fiber; wherein the output optical beam comprises one or more optical wavelengths; and wherein the light source and output optical beam are pulsed; a light beam set-up configured to receive at least a portion of the output optical beam and to form a filtered optical beam; a measurement apparatus configured to receive a received portion of the filtered optical beam and to deliver a delivered portion of the filtered optical beam to a sample; and a receiver configured to receive at least a portion of a spectroscopy output beam generated from the sample by the delivered portion of the filtered optical beam, wherein the receiver is further configured to perform time-gated detection and to be synchronized with one or more pulses from the light source; wherein the receiver is further configured to process the at least a portion of the spectroscopy output beam to generate an output signal, wherein the receiver processing includes at least in part using chemometrics or multivariate analysis to permit identification of materials within the sample; and wherein the output signal is based at least in part on a chemical composition of the sample, and wherein the light source and receiver are remote from the sample. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification