Photoelectric levelness detector
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United States of America Patent
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Apr 21, 1998
Grant Date -
N/A
app pub date -
Jun 13, 1995
filing date -
Jun 13, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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