Modular electromagnetic sensing apparatus having improved calibration
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United States of America Patent
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-
Mar 18, 2003
Grant Date -
Apr 18, 2002
app pub date -
Dec 15, 2000
filing date -
Dec 17, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An electromagnetic sensing apparatus which has an electromagnetic transmitter, at least one receiver device, at least one calibration device, a switch and a processor. The transmitter generates a transmitter signal. The receiver device is spaced from the transmitter, senses an electromagnetic field proximate thereto and generates a receiver signal. The calibration device senses an electromagnetic field proximate thereto and generates a calibration signal. The calibration device is positioned such that the distance between the transmitter and the receiver device is greater than the distance between the transmitter and the calibration device. The switch is connected between the receiver device and the calibration device. The processor includes a first input for receiving a signal from one of the at least one receiver device and the calibration device and a second input for receiving a signal from the switch and compares the first input and second input and monitors distortions in the transmitter signal.
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