Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1977-07-25
1978-07-04
Krawczewicz, Stanley T.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
200DIG1, 324 61QS, 340200, 340657, 328 5, G01R 2726
Patent
active
040991180
ABSTRACT:
A portable sensor adapted to be moved along a wall to indicate a change in the dielectric constant of the wall thereby to signal the presence of a wall stud within the wall. The sensor incorporates a capacitor plate positioned adjacent the surface in contact with the wall and a circuit for detecting any change in the capacitive charge on the capacitor. Any change in capacitive charge as the sensor is moved along the wall is due to a change in the dielectric constant of the wall because of the presence of a wall stud behind the wallboard. The sensor visually indicates any change in the dielectric constant in a manner to permit selection of the center of the change in dielectric constant thereby indicating the center of the wall stud. An additional feature of the circuit permits automatic calibration of the sensor to a level corresponding to the dielectric constant of the wallboard so that any change in the dielectric constant of the wall due to the presence of a stud is readily observable.
REFERENCES:
patent: 2772394 (1956-11-01), Bradley
patent: 2885633 (1959-05-01), Cook
patent: 3043993 (1962-07-01), Maltby
patent: 3086109 (1963-04-01), Kaehms
patent: 3694742 (1972-09-01), Bergmanis et al.
patent: 3805156 (1974-04-01), Norton et al.
patent: 3883800 (1975-05-01), Dupont
patent: 4016490 (1977-04-01), Weckenmann et al.
Franklin Robert C.
Fuller Frank I.
Krawczewicz Stanley T.
Moore Gerald L.
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