Optical remote sensing of fugitive releases
First Claim
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1. An open-path optical sensor, comprising:
- a source assembly, said source assembly emitting UV radiation corresponding to a signal channel and a reference channel;
a detector assembly for receiving UV radiation emitted by said source assembly, said detector assembly comprising (i) a first detector for detecting UV radiation corresponding to the signal channel, (ii) a second detector for detecting UV radiation corresponding to the reference channel, and (iii) a data acquisition system in communication with said first detector and said second detector;
a plurality of reflectors for directing UV radiation emitted by said source assembly to said detector assembly, each of said reflectors being positioned at one end of a different monitoring path, said detector assembly being positioned at the other end of each monitoring path; and
a positioning device, said source assembly and said detector assembly being mounted on said positioning device, wherein said positioning device is capable of reorienting said source assembly and said detector assembly between the monitoring paths;
wherein said first detector comprises a band-pass filter for rejecting UV radiation outside of the signal channel;
wherein said second detector comprises a band-pass filter for rejecting UV radiation outside of the reference channel;
wherein said data acquisition system calculates the ratio of (i) the intensity of the UV radiation corresponding to the signal channel to (ii) the intensity of the UV radiation corresponding to the reference channel;
wherein the signal channel is a wavelength or range of wavelengths between about 170 nanometers and 230 nanometers; and
wherein the reference channel is a wavelength or range of wavelengths between about 260 nanometers and 300 nanometers.
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Abstract
Disclosed is an open-path optical sensor. Typically, the optical sensor directs UV radiation from a source assembly to a detector assembly along a monitoring path. The source assembly emits UV radiation corresponding to a signal channel and to a reference channel. The detector assembly detects UV radiation corresponding to the signal channel and to the reference channel. The detector assembly is in communication with a data acquisition system, which compares the intensity of the detected UV radiation corresponding to the signal channel to the intensity of the UV radiation corresponding to the reference channel.
9 Citations
20 Claims
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1. An open-path optical sensor, comprising:
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a source assembly, said source assembly emitting UV radiation corresponding to a signal channel and a reference channel; a detector assembly for receiving UV radiation emitted by said source assembly, said detector assembly comprising (i) a first detector for detecting UV radiation corresponding to the signal channel, (ii) a second detector for detecting UV radiation corresponding to the reference channel, and (iii) a data acquisition system in communication with said first detector and said second detector; a plurality of reflectors for directing UV radiation emitted by said source assembly to said detector assembly, each of said reflectors being positioned at one end of a different monitoring path, said detector assembly being positioned at the other end of each monitoring path; and a positioning device, said source assembly and said detector assembly being mounted on said positioning device, wherein said positioning device is capable of reorienting said source assembly and said detector assembly between the monitoring paths; wherein said first detector comprises a band-pass filter for rejecting UV radiation outside of the signal channel; wherein said second detector comprises a band-pass filter for rejecting UV radiation outside of the reference channel; wherein said data acquisition system calculates the ratio of (i) the intensity of the UV radiation corresponding to the signal channel to (ii) the intensity of the UV radiation corresponding to the reference channel; wherein the signal channel is a wavelength or range of wavelengths between about 170 nanometers and 230 nanometers; and wherein the reference channel is a wavelength or range of wavelengths between about 260 nanometers and 300 nanometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An open-path optical sensor, comprising:
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a source assembly, said source assembly emitting UV radiation corresponding to a signal channel and a reference channel; a detector assembly for receiving UV radiation emitted by said source assembly, said detector assembly comprising (i) a first detector for detecting UV radiation corresponding to the signal channel, (ii) a second detector for detecting UV radiation corresponding to the reference channel, and (iii) a data acquisition system in communication with said first detector and said second detector; a plurality of reflectors for directing UV radiation emitted by said source assembly to said detector assembly, each of said reflectors being positioned at one end of a different monitoring path, said detector assembly being positioned at the other end of each monitoring path; and a gimbal mirror, said gimbal mirror being positioned to direct UV radiation from said source assembly to one of said reflectors and back to said detector assembly, wherein said gimbal mirror is capable of being reoriented between the monitoring paths; wherein said first detector comprises a band-pass filter for rejecting UV radiation outside of the signal channel; wherein said second detector comprises a band-pass filter for rejecting UV radiation outside of the reference channel; wherein said data acquisition system calculates the ratio of (i) the intensity of the UV radiation corresponding to the signal channel to (ii) the intensity of the UV radiation corresponding to the reference channel; wherein the signal channel is a wavelength or range of wavelengths between about 170 nanometers and 230 nanometers; and wherein the reference channel is a wavelength or range of wavelengths between about 260 nanometers and 300 nanometers. - View Dependent Claims (10, 11, 12)
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13. An open-path optical sensor, comprising:
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a source assembly, said source assembly emitting UV radiation corresponding to a signal channel and a reference channel; a detector assembly for receiving UV radiation emitted by said source assembly, said detector assembly comprising (i) a first detector for detecting UV radiation corresponding to the signal channel, (ii) a second detector for detecting UV radiation corresponding to the reference channel, and (iii) a data acquisition system in communication with said first detector and said second detector; a plurality of source assemblies for emitting UV radiation toward said detector assembly, each of said source assemblies emitting UV radiation corresponding to the signal channel and the reference channel, wherein each of said source assemblies is positioned at one end of a different monitoring path, said detector assembly being positioned at the other end of each monitoring path; and a positioning device, said detector assembly being mounted on said positioning device, wherein said positioning device is capable of reorienting said detector assembly between the monitoring paths; wherein said first detector comprises a band-pass filter for rejecting UV radiation outside of the signal channel; wherein said second detector comprises a band-pass filter for rejecting UV radiation outside of the reference channel; wherein said data acquisition system calculates the ratio of (i) the intensity of the UV radiation corresponding to the signal channel to (ii) the intensity of the UV radiation corresponding to the reference channel; wherein the signal channel is a wavelength or range of wavelengths between about 170 nanometers and 230 nanometers; and wherein the reference channel is a wavelength or range of wavelengths between about 260 nanometers and 300 nanometers. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification