Level measuring instrument having a staff with light-emitting el

Details Level measuring instrument having a staff with light-emitting el Level measuring instrument having a staff with light-emitting el

1982-04-13

1984-12-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356152, 356400, 33293, G01B 1127, G01C 1506

Patent

active

044880502

ABSTRACT:
A level measuring instrument including a staff having a plurality of light emitting diodes located along the length of the staff with predetermined spacings. The light emitting diodes produces coded lights which are distinguishable with each other. The instrument further includes a light receiving optical system and an electrical system which discriminates a particular diode which has produced the light as received by the optical system.

REFERENCES:
patent: 3330955 (1967-07-01), Barecki et al.
patent: 3790277 (1974-02-01), Hogan
patent: 3857639 (1974-12-01), Mason
patent: 3972622 (1976-08-01), Mason et al.

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