Optical path structure for open path emissions sensing with spinning mirror
First Claim
Patent Images
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 plurality of filter elements;
a spinning mirror face that reflects the beam so that the beam reaches each of the filter elements in sequence; and
a monolithic ellipsoidal mirror that receives the beam from the spinning mirror and directs the beam through the filters.
5 Assignments
0 Petitions
Accused Products
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.
76 Citations
22 Claims
-
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 plurality of filter elements;
a spinning mirror face that reflects the beam so that the beam reaches each of the filter elements in sequence; and
a monolithic ellipsoidal mirror that receives the beam from the spinning mirror and directs the beam through the filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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; and
a second receiver for receiving the second light beam.
-
-
3. The system according to claim 2, further comprising:
-
a third emitter for emitting a third light beam; and
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.
-
-
4. The system according to claim 2, wherein the light beam is 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.
-
5. The system according to claim 4, wherein the reflector 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.
-
6. The system according to claim 1, wherein the first emitter is an infrared emitter.
-
7. The system according to claim 2, wherein the second emitter is one of an infrared, ultraviolet light, or visible light emitter.
-
8. The system according to claim 2, wherein at least a portion of the first beam overlaps at least a portion of the second beam.
-
9. The system according to claim 3, wherein the first emitter is an infrared emitter, and wherein the second emitter is an ultraviolet light emitter, and wherein the third emitter is a visible light emitter.
-
10. The system according to claim 9, wherein at least a portion of the third beam overlaps at least a portion of at least one of the first and second beams.
-
11. The system according to claim 1, wherein the spinning mirror face has a plurality of faces.
-
12. The system according to claim 1, wherein the filter elements are removable.
-
13. The system according to claim 1, wherein the number of filter elements is at least four.
-
14. The system according to claim 1, wherein the filter elements are disposed at regular angular intervals.
-
15. The system according to claim 1, further comprising at least one cell positioned in the optical path along with a filter element.
-
16. The system according to claim 1, further comprising at least one cell used in place of a filter element.
-
17. The system according to claim 1, wherein the mirror receives the beam after the beam has passed across the vehicle path.
-
18. The system according to claim 1, further comprising a spherical mirror that receives the beam from the filters, and focuses and directs the beam to the receiver.
-
19. The system according to claim 16, wherein the first emitter emits infrared light.
-
20. The system according to claim 16, wherein the spinning mirror face reflects the beam after the beam has crossed the vehicle path.
-
21. The system according to claim 1 wherein the spinning mirror face is located near a first focal point of the monolithic ellipsoidal mirror.
-
22. The system according to claim 21, further comprising a detector, located near a second focal point of the monolithic ellipsoidal mirror.
Specification