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; and a spinning mirror face that reflects the beam so that the beam reaches each of the filter elements in sequence.
- 2. The system according to claim 1, further comprising:
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 3, when 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, further comprising an ellipsoidal mirror that receives the beam from the spinning mirror and directs the beam through the filters.
- 13. The system according to claim 1, wherein the filter elements are removable.
- 14. The system according to claim 1, wherein the number of filter elements is at least four.
- 15. The system according to claim 1, wherein the filter elements are disposed at regular angular intervals.
- 16. The system according to claim 1, further comprising at least one cell positioned in the optical path along with a filter element.
- 17. The system according to claim 1, further comprising at least one cell used in place of a filter element.
- 18. The system according to claim 1, wherein the mirror receives the beam after the beam has passed across the roadway.
- 19. The system according to claim 12, further comprising a spherical mirror that receives the beam from the filters, and focuses and directs the beam to the receiver.
- 20. An optical system for a gas component analysis, comprising:
means located on a first side of a vehicle path for emitting a first light beam having a first spectrum across the vehicle path; means for receiving the first light beam; and spinning means for reflecting the beam so that the beam reaches the filter elements in sequence.
- 21. The system according to claim 17, wherein the emitting means emits infrared light.
- 22. The system according to claim 17, wherein the spinning means reflects the beam after the beam has crossed the vehicle path.
- 23. A method for gas component analysis, comprising the steps of:
emitting a first light beam having a first spectrum across the vehicle path; receiving the first light beam; and reflecting the beam so that the beam reaches the filter elements in sequence.
PRIORITY
[0001] The present application is a continuation-in-part of pending U.S. patent application Ser. No. 09/934,272, filed Aug. 21, 2001, entitled Optical Path Structure for Open Emissions Sensing, the disclosure of which is incorporated herein by reference in its entirety.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09934272 |
Aug 2001 |
US |
Child |
10028725 |
Dec 2001 |
US |