Device for detecting ferromagnetic materials
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United States of America Patent
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Oct 12, 1982
Issued Date -
N/A
app pub date -
May 5, 1980
filing date -
Oct 12, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for detecting ferromagnetic material such as is present in an explosive cartridge being loaded into a borehole, e.g., according to the method described in U.S. Pat. No. 3,986,430, which includes an inductance coil connected in series with a resistor, separately rectifies and amplifies the AC voltages across the coil and resistor and connects them in series opposition. The value of the balancing resistance is adjusted so that the two rectified voltages are equal and opposite when no ferromagnetic material is present. When the unbalance voltage exceeds a threshold value, a signalling device is actuated.
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