Electronic detector with capacitor sensor and magnetic field sen

Details Electronic detector with capacitor sensor and magnetic field sen Electronic detector with capacitor sensor and magnetic field sen

1987-12-09

1989-08-22

Strecker, Gerard R.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61R, 324236, 331 65, G01R 3300, G01R 2726, G01V 311

Patent

active

048599310

ABSTRACT:
An electronic detector for locating an object behind a wall surface has a metallic object detecting section and a general object detecting section which are energized by a common battery to be operative simultaneously. The metallic object detecting section includes a magnetic field sensor for detecting any change in a magnetic field developed therearound and providing a second electric signal indicative of that change. The general object detecting section includes a capacitor sensor for sensing any change in the capacitance of the wall and providing a first electric signal indicative of that change. The first and second electric signals are applied respectively to first and second control circuits where they are analyzed to provide first and second control outputs when their levels reach first and second reference levels, respectively. Upon receiving the first and second control output, first and second indicators turn on for indicating the detection results. Thus, both of the first and second indicators will turn on when there is detected a metallic object behind the wall surface and only the first indicator will turn on when there is deteced a non-metallic object behind the wall surface, whereby the user can easily distinguish the metallic object and the non-metallic object detected.

REFERENCES:
patent: 3609735 (1971-09-01), Dauterman et al.
patent: 3764819 (1973-10-01), Muller
patent: 4099118 (1978-07-01), Franklin et al.
patent: 4686454 (1987-08-01), Pecukonis

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