Optical path structure for open path emissions sensing with spinning filter wheel
First Claim
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1. An optical system for a gas component analysis, comprising:
- a first emitter located on a first side of a vehicle path for emitting a first light beam having a first spectrum across the vehicle path;
a first receiver for receiving the first light beam;
a spinning filter wheel that filters the beam from the first emitter before the beam crosses the vehicle path;
a second emitter located on the first side of the vehicle path for emitting a second light beam at a second spectrum across the vehicle path;
a second receiver for receiving the second light beam;
a third emitter for emitting a third light beam;
a third light receiver for detecting the third light beam, wherein the third light beam travels along a third path, and at least a portion of the third path overlaps with at least a portion of the second path; and
a reflector that is a retroreflective assembly having at least three reflective faces, and wherein at least one of the beams travels across the road at a first height above the road, and returns across the road at a second height above the road different from the first height.
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Abstract
An optical system for a gas component analysis includes an emitter for emitting first light beam having a first spectrum, a second emitter for emitting a second light beam at a second spectrum, a first receiver for receiving the first light beam, and a second receiver for receiving the second light beam.
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Citations
17 Claims
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1. An optical system for a gas component analysis, comprising:
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a first emitter located on a first side of a vehicle path for emitting a first light beam having a first spectrum across the vehicle path;
a first receiver for receiving the first light beam;
a spinning filter wheel that filters the beam from the first emitter before the beam crosses the vehicle path;
a second emitter located on the first side of the vehicle path for emitting a second light beam at a second spectrum across the vehicle path;
a second receiver for receiving the second light beam;
a third emitter for emitting a third light beam;
a third light receiver for detecting the third light beam, wherein the third light beam travels along a third path, and at least a portion of the third path overlaps with at least a portion of the second path; and
a reflector that is a retroreflective assembly having at least three reflective faces, and wherein at least one of the beams travels across the road at a first height above the road, and returns across the road at a second height above the road different from the first height. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical system for a gas component analysis, comprising:
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a first emitter located on a first side of a vehicle path for emitting a first light beam having a first spectrum across the vehicle path;
a first receiver for receiving the first light beam; and
a spinning filter wheel that filters the beam from the first emitter before the beam crosses the vehicle path;
wherein the spinning filter wheel has a plurality of filter elements, and wherein the filter elements are quarter circular in shape. - View Dependent Claims (10, 11, 12, 13)
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14. An optical system for a gas component analysis, comprising:
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a first emitter located on a first side of a vehicle path for emitting a first light beam having a first spectrum across the vehicle path;
a first receiver for receiving the first light beam;
a spinning filter wheel that filters the beam from the first emitter before the beam crosses the vehicle path; and
a synchronization feature on the wheel and a controller that interacts with the synchronization feature to measure the speed of rotation of the wheel. - View Dependent Claims (15, 16, 17)
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Specification