Resources Contact Us Home
Metal detector

Image Number 8 for United States Patent #8473235.

The present invention provides apparatus for scanning a product to detect metal in that product. The apparatus comprises a drive coil (4), for generating an electromagnetic field in the product, and a detection coil arranged to detect fluctuations in the magnetic field caused by the presence of a metallic particle in the product. A drive circuit (26) for the drive coil (4) comprises a plurality of switches (19 to 22) driven by a controller (16), which switch alternately connect the drive coil across a potential difference to cause the drive coil to be driven at an operating frequency determined by operation of the switches. Using a switching circuit to drive the drive coil (4) greatly increases the number of frequencies at which the drive coil may be operated. The invention has particular application to the food industry.

  Recently Added Patents
Selection of system parameters based on non-acoustic sensor information
Organic light-emitting display and method of manufacturing the same
Dry-cooling unit with gravity-assisted coolant flow
Package for product
Opioid-ketamine and norketamine codrug combinations for pain management
Method for decoding a spatially multiplexed data signal using a maximum likelihood detection
Quaternary chalcogenide wafers
  Randomly Featured Patents
System for testing at least one electronic control unit and method
Polymer blends
Universal battery tray
Stackable container apparatus and methods
Desktop charger
Aqueous coating composition
Rotary support device
Sequential taking camera with plural lenses
Integrated circuit device characterization
Antimicrobial conveyor lubricant composition and method for using