MAGNETIC GRADIENT VEHICLE DETECTOR

The patent describes a metallic object detection apparatus. The detection apparatus comprises a transmitter which radiates electromagnetic energy to a receiving means which has a substantially zero voltage induced therein when a metallic object is not magnetically coupled to the transmitter and the receiving means. When a metallic object becomes magnetically coupled to the electromagnetic field radiating from the transmitter, eddy currents are induced in the metallic structure of the metallic object which in turn induce a non zero voltage within the receiving means.

• Supplemental Notes:
  • Supersedes PB-230 627. Government-owned invention available for licensing. Copy of patent available Commissioner of Patents, Washington, D.C. 20231. The date, October 7, 1975, is date of issue of the patent.
• Corporate Authors:

  Department of Transportation

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Mills, M K
• Publication Date: 1975-10-7

Media Info

• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Detectors; Eddy currents; Electromagnetic properties; Highway traffic control; Magnetic detectors; Patents; Radio transmitters; Vehicle detectors
• Old TRIS Terms: Magnetic detection; Magnetic vehicle detector
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00136638
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: PAT-APPL-0453 332,, PATENT-3 911 389
• Files: TRIS, USDOT
• Created Date: Jul 13 2002 12:00AM