Apparatus and method for thermal detection

• US 7,828,478 B2
• Filed: 05/26/2005
• Issued: 11/09/2010
• Est. Priority Date: 09/29/2004
• Status: Active Grant

• Current Assignee: Aptiv Technologies AG
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Rege, Siddharth S., Harter, Joseph E. Jr., Taylor, Ronald M.
• Primary Examiner(s): VERBITSKY, GAIL KAPLAN
• Application Number:
  US11/138,532
• Publication Number:
  US 20060067378A1
• Time in Patent Office: 1,993 Days
• Field of Search: 374/120, 374/121, 374/135, 374/137, 374/129, 374/130, 374/141, 374/29, 374/30, 374/100, 374/111, 374/112, 374/124, 374/132, 374/142, 374/148, 374/166, 374/167, 374/179, 374/208, 374/45, 250/338.1, 250/353, 340/539.23
• US Class Current: 374/141
• CPC Class Codes: G01J 5/0022 for sensing the radiation of moving bodies
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/04 Casings
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/0808 Convex mirrors
• CPC Class Codes: G01J 5/0831 Masks; Aperture plates; Spatial light modulators
• CPC Class Codes: G01J 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G01J 5/0893 Arrangements to attach devices to a pyrometer, i.e. attaching an optical interface; Spatial relative arrangement of optical elements, e.g. folded beam path G01J5/049 takes precedence

Abstract

A thermal detecting device for sensing temperature at multiple locations proximate to the detecting device is provided. The detecting device has a pair of infrared detectors each configured to measure temperature of two locations by receiving infrared energy of the two locations. A housing encloses the pair of infrared detectors. The housing is configured with an aperture to allow the infrared energy of the two locations to be received by the pair of infrared detectors. A reflective mirror or two mirrors focus the infrared energy of the two locations towards the pair of infrared detectors. The detecting device may be configured to determine if there is a temperature differential at a location as the housing moves with respect to the location.

Claims

1. A thermal radiation detecting device for sensing temperature at multiple locations proximate to a vehicle, the detecting device comprising:

a first infrared detector located on a vehicle and configured to measure a temperature of a first location proximate to the vehicle by receiving the infrared radiation of the first location;

a second infrared detector located on the vehicle and configured to measure a temperature of a second location proximate to the vehicle by receiving the infrared radiation of the second location, wherein said second location is substantially non-overlapping of said first location;

a housing located on the vehicle for housing said first and second infrared detectors, said housing being configured to allow the infrared radiation of first and second locations to be received therein; and

a reflector for directing the infrared radiation of said first location towards said first infrared detector and for directing the infrared radiation of said second location towards the second infrared detector, wherein the detecting device has an operating temperature range from −

40°

C. to 85°

C., and said detecting device is configured to determine a temperature differential by comparing a short term average to a threshold value, said short term average being based upon the infrared radiation received by said first and second infrared detectors.

2. The detecting device as defined in claim 1, wherein said reflector comprises is a compound reflective mirror comprising first and second reflective portions.

3. The detecting device as defined in claim 1, wherein said reflector comprises first and second reflective mirrors.

4. The detecting device as defined in claim 1 further comprising a reconfigurable limiting aperture for receiving infrared radiation received from one of said first and second locations, wherein said reconfigurable limiting aperture allows an instantaneous field of view to be changed to allow for use in multiple platform applications.

5. The detecting device as defined in claim 1, wherein said first and second infrared detectors are infrared thermopiles.

6. The detecting device as defined in claim 1, wherein said first and second infrared detectors are passive infrared devices.

7. The detecting device as defined in claim 1, wherein the detecting device is employed as a vehicle blind spot detector configured to detect an object in a blind spot of the vehicle.

17. The detecting device as defined in claim 1, wherein said short term average is a difference in corresponding temperatures sensed by said first and second detectors, and said threshold value is based upon the infrared radiation received from said first and second infrared detectors with respect to a speed of the vehicle detectors.

18. The detecting device as defined in claim 1, wherein said first and second infrared detectors and said reflector are fixedly located on the vehicle.

8. A thermal radiation detecting device for sensing temperature at multiple locations proximate to a vehicle, the detecting device comprising:

a first infrared detector fixedly located on a vehicle and configured to measure a temperature of a first location proximate to the vehicle by receiving the infrared radiation of said first location;

a second infrared detector fixedly located on the vehicle and configured to measure a temperature of a second location proximate to the vehicle by receiving the infrared radiation of said second location, wherein said second location is substantially non-overlapping of said first location;

a housing located on the vehicle for housing said first and second infrared detectors, said housing being configured to allow the infrared radiation of said first and second locations to be received therein;

a first reflector fixedly located on the vehicle for directing infrared radiation of said first location towards said first infrared detector; and

a second reflector fixedly located on the vehicle for directing infrared radiation of said second location towards said second infrared detector, wherein the detecting device has an operating temperature range from −

40°

C. to 85°

C., and said detecting device is configured to determine a temperature differential by comparing a short term average to a threshold value, said short term average being based upon the infrared radiation received by said first and second infrared detectors and said threshold value being based upon the infrared radiation received by said first and second infrared detectors with respect to a speed of the vehicle.

9. The detecting device as defined in claim 8 further comprising a reconfigurable limiting aperture for receiving infrared radiation received from one of said first and second locations, wherein said reconfigurable limiting aperture allows an instantaneous field of view to be changed to allow for use in multiple platform applications.

10. The detecting device as defined in claim 8, wherein the first and second reflectors each comprises a reflective minor.

11. The detecting device as defined in claim 8, wherein said first and second infrared detectors are infrared thermopiles.

12. The detecting device as defined in claim 8, wherein said first and second infrared detectors are passive infrared devices.

13. The detecting device as defined in claim 8, wherein the detecting device is employed as a blind spot detector.

14. A method for determining a temperature differential at at least one location proximate to a vehicle after the vehicle has moved in position with respect to the location, the method comprising:

determining a temperature of the at least one location proximate to the vehicle using a pair of infrared sensors each receiving infrared energy from a reflective mirror;

comparing said measured temperature of the at least one location by said pair of infrared temperature sensors; and

providing an indication of a temperature differential between the measured temperature of the at least one location by said pair of infrared temperature sensors, wherein the pair of sensors have an operating temperature range of −

40°

C. to 85°

C., and said detecting device is configured to determine a temperature differential by comparing a short term average to a threshold value, said short term average being based upon the infrared radiation received by said pair of infrared sensors, wherein said short term average is a difference in corresponding temperatures sensed by said pair of infrared sensors and said threshold value is based upon the infrared radiation received from said pair of infrared sensors with respect to a speed of the vehicle.

15. The method as defined in claim 14 further comprising the step of detecting an object in a blind spot of the vehicle based on the temperature differential.

16. The method as defined in claim 14, wherein said short term average is determined by a taking a difference in corresponding temperatures sensed by said pair of infrared temperature sensors.