Proximity sensor gap measuring method and apparatus

Details Proximity sensor gap measuring method and apparatus Proximity sensor gap measuring method and apparatus

1992-11-02

1995-04-25

Ramirez, Ellis B.

Boots, shoes, and leggings

364561, 324202, 324601, G01B 2726

Patent

active

054104882

ABSTRACT:
A device for testing a proximity sensor and precisely measuring the rigging gap between the sensor and its metal target. The sensor is stimulated with a signal of a known frequency and sensor impedance or a component thereof, such as inductance, is measured. The measured value is converted into gap width using a lookup table. The gap width may be displayed to the operator or automatically compared to an optimal range of gap widths for a sensor of the type under test. An operator may also test the sensor using a precision tool that has a dielectric spacer of a known width attached to a metal target. While the operator holds the tool with the spacer in contact with the face of the sensor, the present invention measures impedance and converts it into a gap width. The gap width should equal the known width of the spacer if the sensor is functioning properly. If the difference between the known spacer width and the measured width is less than a predetermined tolerance, the difference may be stored as a gap error. This gap error is used to offset subsequent measurements of the gap between an installed sensor and its target before the measurements are displayed.

REFERENCES:
patent: 4219740 (1980-08-01), Little
patent: 4827248 (1989-05-01), Crudden et al.
patent: 4845429 (1989-07-01), Burreson
patent: 5066912 (1991-11-01), Kwiatkowski
patent: 5148107 (1992-09-01), Finger et al.
Eldec Corporation, "Operators Manual With Illustrated Parts List", Nov. 1, 1985.

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