Tilt detecting device

Details Tilt detecting device Tilt detecting device

1998-02-05

1999-09-14

Hantis, K P

Optics: measuring and testing

Fiducial instruments

Artificial reference

33366, G01C 918

Patent

active

059531169

ABSTRACT:
A tilt detecting device of the present invention comprises a bubble tube 21, a light emitting element 22 for emitting detection light and photodetector elements 23 and 24 arranged opposite to each other with the bubble tube therebetween, and at least a light shading plate 35 disposed on an optical path of the detection light 26 and for partially blocking off light components entering the photodetector elements from the light emitting element, whereby a part of the detection light entering the photodetector elements is blocked off and it increase difference and ratio of light amounts between the case where the detection light passes through the air bubble of the bubble tube and the case where it passes through only the liquid portion of the bubble tube, and tilt detection accuracy is improved.

REFERENCES:
patent: 4956922 (1990-09-01), Bodewes
patent: 5101570 (1992-04-01), Shimura

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