Differential fiber optic proximity sensor

Details Differential fiber optic proximity sensor Differential fiber optic proximity sensor

1980-06-26

1982-11-16

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Photoelectric

73723, 250227, 250559, 356375, 356381, G01B 1114, G01L 900

Patent

active

043589600

ABSTRACT:
Proximity sensor for determining the distance between a reflective surface and the sensor utilizes two output light guides positioned with the receiving end of one guide closer to the reflective surface than that of the other. When the surface is close to the guide ends a relatively greater intensity of light will be reflected to the second guide; when the surface is further away a relatively greater intensity of light will be reflected to the first guide. At a predetermined intermediate null position the reflected light intensities will be equal. The device has uses, inter alia, in accurately positioning objects without wear-producing contact, e.g. in numerically controlled machine tool operations; thickness sensing or thickness controlling using single or dual sensors; force sensing; liquid level indication; meter relay actuation; rotational limitation, and the like.

REFERENCES:
patent: 3327584 (1967-06-01), Kissinger
patent: 3503116 (1970-03-01), Strack
patent: 3580082 (1971-05-01), Strack
patent: 3686958 (1972-08-01), Porter et al.
patent: 3778157 (1973-12-01), Brelot et al.
patent: 3789667 (1974-02-01), Porter et al.
patent: 4210029 (1980-07-01), Porter

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