Metal detection apparatus
US8841903B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2012 |
| Grant date | Sep 23, 2014 |
| Priority date | — |
| Expiry date | Apr 17, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A metal detection apparatus that uses one or more operating frequencies. The metal detection apparatus comprises, among other things, a transmitter unit that provides transmitter signals to a transmitter coil that is coupled to a receiver coil, which is connected to the input of a receiver unit. The transmitter unit comprises a frequency generator that provides an operating frequency to the input of an amplifier stage, whose output is connected via a transformer to the transmitter coil. The amplifier stage is connected to a first tap and the transmitter coil is connected to a second tap of the same transformer winding of the transformer. A resonant circuit is formed that is tuned to the operating frequency, and can be tuned optimally and independently of other parts of the transmitter unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.