Photoelectric levelness detector

Details Photoelectric levelness detector Photoelectric levelness detector

1995-06-13

1998-04-21

Oen, William L.

Measuring and testing

Liquid level or depth gauge

With illumination

G01F 2300

Patent

active

057406936

ABSTRACT:
The invention is a level detector having an elongated level tube containing a bubble in a liquid, a detector body enveloping and supporting the level tube, a projector for emitting light, a reflector for directing the emitted light across the level tube, a photoelectric sensor for sensing the light arriving from the level tube, the sensor having a plurality of separate photoelectric receptor elements, a discriminator circuit for identifying selected receptor elements to determine the location of light arriving across the level tube without interference by the bubble therein and thus to detect the levelness of the detector body and of any surface on which the body is disposed, and at least one level indicator for providing a readout of the levelness.

REFERENCES:
patent: 1772908 (1930-08-01), Mahon
patent: 2194625 (1940-03-01), Vermohlen
patent: 2362872 (1944-11-01), Weagle
patent: 3128626 (1964-04-01), Faber
patent: 3452208 (1969-06-01), Giltinan
patent: 3511572 (1970-05-01), Peube et al.
patent: 4193004 (1980-03-01), Lobdell et al.
patent: 4297588 (1981-10-01), Hastbacka

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