Multilane remote sensing device

• US 20020092988A1
• Filed: 07/18/2001
• Published: 07/18/2002
• Est. Priority Date: 10/30/1998
• Status: Active Grant

• Current Assignee: Envirotest Systems Corporation (Stone Rivet, Inc.)
• Original Assignee: Envirotest Systems Corporation (Stone Rivet, Inc.)
• Inventors: Johnson, James H., Stedman, Donald H., Didomenico, John, Williams, W. John, Bishop, Gary A.
• Granted Patent: US 7,164,132 B2
• Time in Patent Office: Days
• US Class Current: 250/338.5
• CPC Class Codes: G01N 2021/1793 Remote sensing
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis

Abstract

A remote sensing device is provided to detect the emissions of passing vehicles. Preferably, the device detects the emissions of individual vehicles traveling on a roadway of more than one traffic lane. The remote sensing device may preferably detect the emissions due to an individual vehicle in situations where more than one vehicle is present. The device is capable of determining which sensed emission data corresponds to which vehicle exhaust plume.

Claims

1. A system for remote sensing of vehicle emissions in a multilane setting with a plurality of vehicle travel lanes, the system comprising:

at least one radiation source which emits a radiation beam;

at least one radiation detector for receiving the radiation beam; and

at least one processor for processing at least vehicle emission data obtained from the at least one radiation detector, wherein the at least one processor determines which vehicle emission data obtained from the radiation detector is representative of a particular vehicle'"'"'s exhaust plume.

2. The system according to claim 1, wherein the at least one processor compares a decay rate of the exhaust plume with a predicted decay rate to determine if the exhaust plume is representative of a particular vehicle'"'"'s exhaust plume.

3. The system according to claim 2, wherein the decay rate is based on dissipation characteristics of the exhaust plume constituents.

4. The system according to claim 1, wherein the at least one processor compares a decay rate of the exhaust plume with a known decay rate for a particular vehicle to determine if the exhaust plume is representative of that particular vehicle'"'"'s exhaust plume.

5. The system according to claim 1, wherein the system includes at least one vehicle identification unit operatively connected to the processor and the processor associates detected vehicle emissions data with a specific, identified vehicle, based on information obtained from the at least one vehicle identification unit.

6. The system according to claim 1, further comprising at least one reflector for directing the radiation beam emitted from the at least one radiation source to the at least one radiation detector.

7. The system according to claim 6, wherein the at least one reflector is selected from the group consisting of a mirror, a flat mirror, a lateral transfer mirror, a vertical transfer mirror, or a retroflector.

8. The system according to claim 1, wherein the system comprises at least one radiation source and at least one radiation detector per lane in the multilane setting.

9. The system according to claim 1, wherein the system comprises a plurality of radiation sources and a plurality of radiation detectors per lane.

10. The system according to claim 5, wherein the at least one vehicle identification unit is selected from the group consisting of an automatic license plate reader, photographic apparatus, at least one receiver for receiving a vehicle identification signal from a transponder located on a vehicle, and at least one reader which reads vehicle identification information located on a vehicle.

11. The system according to claim 1, further comprising a thermal detection unit for determining the temperature of one or more vehicle components.

12. The system according to claim 6, wherein the at least one radiation source and the at least one radiation detector are located directly above a vehicle lane and the at least one reflector is located below or flush with the vehicle lane.

13. The system according to claim 1, further comprising at least one speed and acceleration device for determining the speed and acceleration of a vehicle.

14. The system according to claim 13 wherein the at least one speed and acceleration device includes a light beam directed across a lane from any direction.

15. The system according to claim 13, wherein the at least one speed and acceleration device includes a drive over detector.

16. The system according to claim 1, wherein the system is incorporated into existing roadway structures.

17. The system according to claim 1, where the at least one processor is located remotely from the at least one radiation source and the at least one radiation detector, and information from the at least one radiation detector is communicated via wireless communication to said processor.

18. The system according to claim 1, wherein the processor determines which vehicle emissions data corresponds to which vehicle based on a combination of vehicle emissions data in time and space and vehicle identification data.

20. The system according to claim 19, wherein the processor determines which vehicle emissions data corresponds to which vehicle based on a combination of vehicle emissions data in time and space, and vehicle identification data.

21. The system according to claim 20, wherein the system comprises at least one radiation source, at least one radiation detector, and at least one reflector per vehicle travel lane.

22. The system according to claim 19, wherein the system comprises a plurality of radiation sources, a plurality of radiation detectors and a plurality of reflectors per vehicle travel lane.

23. The system according to claim 19, wherein the at least one vehicle identification unit is selected from the group consisting of an automatic license plate reader, at least one receiver which receives a signal from a transponder located on a vehicle, and at least one reader which reads vehicle identification information located on a vehicle.

24. The system according to claim 19, wherein the at least one radiation source and the at least one radiation detector are located directly above a vehicle lane, and the at least one reflector is located directly below the vehicle lane.

19. A system for remote sensing of vehicle emissions in a multilane setting including a plurality of vehicle travel lanes, the system comprising:

at least one radiation source which emits a radiation beam;

at least one radiation detector for receiving the radiation beam;

a plurality of movable light filters;

at least one reflector for directing the radiation beam from the at least one radiation source to the at least one radiation detector via the movable light filters;

at least one vehicle identification unit; and

at least one processor for processing vehicle emissions data based on the received radiation beam and vehicle identification data received from the at least one vehicle identification unit, wherein the at least one processor determines which vehicle emission data obtained from the radiation detector is representative of a particular vehicle'"'"'s exhaust plume.