Automatic tilt angle compensator

Details Automatic tilt angle compensator Automatic tilt angle compensator

1997-09-11

1999-09-28

Font, Frank G.

Optics: measuring and testing

Fiducial instruments

356249, G01C 902, G01C 918

Patent

active

059597291

ABSTRACT:
An automatic tilt angle compensator, which comprises a sealed container for sealing at least two types of liquids to form a free interface, a light projecting system arranged to project a light beam through the free interface, an entry window for allowing the light beam to enter, reflecting means for reflecting the light beam after passing through the free interface, and an exit window for irradiating the light beam from said sealed container, wherein said entry window, said reflecting means and said exit window are always in contact with said liquid, and when the system is laid down by 90 degrees, the free interface is rotated by 90 degrees, and the light beam passing through the free interface is irradiated through the exit window in the same manner as before the rotation by 90 degrees.

REFERENCES:
patent: 3905707 (1975-09-01), Feist et al.
patent: 5392112 (1995-02-01), Nakamura
patent: 5513001 (1996-04-01), Ohtomo et al.
patent: 5619802 (1997-04-01), Rando et al.
patent: 5684579 (1997-11-01), Ohtomo et al.

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