Inclination measuring apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 11, 2000
Grant Date -
N/A
app pub date -
Feb 27, 1998
filing date -
Feb 28, 1997
priority date (Note) -
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Abstract
Optics-based inclination measuring apparatus (10) for measuring an inclination angle .theta. relative to the horizontal. The apparatus includes a lens (20), a light source (30), a sensor (34) having one or more sensor sections, and a container (40) having a non-opaque near-wall (44). The container contains a liquid (54) having a free surface (60). A light beam (80) from the light source passes through the lens, through the non-opaque container wall and reflects off the free liquid surface. The light beam then passes back through the lens and impinges on the sensor, forming an image, such as a spot image. The location of the spot image on the sensor depends on the inclination angle of the inclination measuring device. Signal ratios from the sensor sections are used to determine the relative location of the spot image and hence the inclination angle.
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