Metal detector
AssigneeCarnes Company, Inc.
InventorJoseph S. Simon
Life of this patent
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Abstract
A vibration canceling circuit for a metal detector. The metal detector includes a transmit coil, first and second receive coils, a differential circuit coupled to the first and second receive coils, a controller coupled to the differential circuit, and a vibration canceling circuit coupled to the controller. The controller uses a signal provided by the vibration canceling circuit to remove a vibration component from a metal detection signal.
Claims21
A metal detector comprising:
- a transmit coil;
- first and second receive coils inductively coupled to the transmit coil;
- a differential circuit coupled to the first and second receive coils;
- a controller coupled to the differential circuit;
- and
- a vibration canceling circuit coupled to the controller.
A method of reducing a vibration component of a detection signal in a metal detector, the method comprising:
- detecting movement of the metal detector on a first axis;
- generating a first signal indicative of the movement on the first axis;
- and
- modifying a detection signal based at least on the first signal.
The method of clam 14, further comprising filtering the first, second, and third signals before combining.
A vibration detection circuit, comprising:
- an accelerometer configured to generate a one or more signals, each signal indicative of movement along an axis;
- a combining filter configured to filter a component of the one or more signals not associated with movement and to combine the components of the one or more signals indicative of movement to create a combined signal;
- an amplifier configured to amplify the combined signal and create an amplified signal;
- and
- an analog to digital converter configured to convert the amplified signal into a digital value.
Dependencies are inferred from the claim text.