Proximity switch having a variable sensing resistor for maintain

Details Proximity switch having a variable sensing resistor for maintain Proximity switch having a variable sensing resistor for maintain

1993-09-02

1996-11-12

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

324225, 32420712, 32420716, 34087031, 331 65, G01B 714

Patent

active

055743668

ABSTRACT:
A proximity switch for determining the approach of a metal object includes an oscillating circuit which has a coil and a capacitor, and which produces a high-frequency field at the poles of the coil. A sensing resistor is connected to the oscillating circuit and serves to determine and evaluate the damping of the oscillating circuit by the object. Also, the sensing resistor is controlled as a function of the current measured in the sensing resistor such that the total resistance of the evaluation circuit remains constant. The voltage drop across the sensing resistor is measured and the measured voltage drop may be used to signal the approach of the metal object.

REFERENCES:
patent: 3941338 (1976-03-01), Knudsen
patent: 4613830 (1986-09-01), Kamiga et al.
patent: 4618835 (1986-10-01), Wilson
patent: 4672230 (1987-06-01), Spahn
patent: 4731591 (1988-03-01), Weigand
patent: 4803444 (1989-02-01), Takahashi
patent: 5043661 (1991-08-01), Dubey
patent: 5079502 (1992-01-01), Rogacki et al.
Japanese Abstract, JP54-153058, Jan. 26, 1980.

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