Optical path structure for open path emissions sensing with opposed sources
First Claim
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1. An optical system for a gas component analysis, comprising:
- a first emitter for emitting a 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;
a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travels along a second path in a second direction and at least a portion of the first light path overlaps with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction;
a third light emitter for emitting a third light beam; and
a third light receiver for receiving 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.
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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
19 Claims
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1. An optical system for a gas component analysis, comprising:
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a first emitter for emitting a 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;
a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travels along a second path in a second direction and at least a portion of the first light path overlaps with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction;
a third light emitter for emitting a third light beam; and
a third light receiver for receiving 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. - View Dependent Claims (2, 3)
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4. An optical system for a gas component analysis, comprising:
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a first emitter for emitting a first light beam having a first spectrum;
a second emitter for emitting a second light beam at a second spectrum; and
a first receiver for receiving the first light beam; and
a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travels along a second path in a second direction and at least a portion of the first light path overlap with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction;
wherein the first and second light beams are projected across a vehicle path, and the first and second emitters and first and second receivers are located on one side of the vehicle path, and wherein the system comprises a reflector located at the other side of the vehicle path to direct the first and second beams from the first and second emitters to the first and second receivers respectively. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical system for a gas component analysis, comprising:
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a first emitter for emitting a first light beam having a first spectrum;
a second emitter for emitting a second light beam at a second spectrum; and
a first receiver for receiving the first light beam, and a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travels along a second path in a second direction and at least a portion of the first light path overlaps with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction;
wherein a portion of the first and second beams follow the same path in the same direction to form a combined beam, and further comprising a splitter element that splits the combined first and second beams into separate beams.
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19. An optical system for a gas component analysis, comprising:
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a first emitter for emitting a first light beam having a first spectrum;
a second emitter for emitting a second light beam at a second spectrum; and
a first receiver for receiving the first light beam;
a second receiver for receiving the second light beam, wherein the first light beam travels along a first path in a first direction and the second light beam travel along a second path in a second direction and at least a portion of the first light path overlaps with at least a portion of the second light path to form an overlapping beam, and at the overlapping beam the first direction is opposite to the second direction, and at least one paraboloidal mirror disposed along a path of the first light beam between the first emitter and the first detector.
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Specification