Inclination measuring apparatus

Details Inclination measuring apparatus Inclination measuring apparatus

1998-02-27

2000-07-11

Buczinski, Stephen C.

Optics: measuring and testing

Angle measuring or angular axial alignment

Photodetection of inclination from level or vertical

3561522, G01B 1126, G01C 100

Patent

active

060880902

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.

REFERENCES:
patent: 3601613 (1971-08-01), Hock
patent: 3617131 (1971-11-01), Taguchi
patent: 4159422 (1979-06-01), Okubo
patent: 5392112 (1995-02-01), Nakamura

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