Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-06-21
1995-05-09
Swarthout, Brent
Communications: electrical
Condition responsive indicating system
Specific condition
324329, G08B 1314, G01V 310
Patent
active
054144116
ABSTRACT:
Metal detector apparatus includes an increased pulse transmit frequency and reduced integration time constant for rapid target response and improved sensitivity to low conductivity metals, including cupro-nickel alloys, platinum and gold. Resistor-capacitor (RC) coupling totally eliminates the need to reset the controls due to changes in temperature or mineralization in the area being searched. The short time constant used in the RC coupling circuit improves the overall stability while reducing noise, allowing for greater amplification in the audio stages. The time constant of the RC coupling stage is equal or similar to the time constant of the integrator. The audio tone is derived from the pulse transmit clock which is synchronous with the power supply inverter to reduce noise and instability in the system.
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Mullen Jr. Thomas J.
Swarthout Brent
White's Electronics, Inc.
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