Equipment for measuring a difference in elevation

Details Equipment for measuring a difference in elevation Equipment for measuring a difference in elevation

1990-09-12

1992-02-11

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 4, 356149, 33294, G01C 500, G01C 322

Patent

active

050871250

ABSTRACT:
An equipment for measuring difference in elevation employing a leveling pole and a level is disclosed. The leveling pole comprises divisions of coded marks each indicating height at a unit interval. The level comprises a telescope and an image sensor. The output signal of the sensor is decoded for display of digital height value. A plate glass is provided in front of an object lens for vertical compensation of an optical axis of the telescope. An inclination angle of the plate glass required for compensation is used for interpolation between two adjacent coded marks.

REFERENCES:
patent: 2981141 (1961-04-01), Armstrong et al.
patent: 4439672 (1984-03-01), Salaman
patent: 4488050 (1984-12-01), Iwafune
patent: 4673287 (1987-06-01), Rickus
patent: 4715714 (1987-12-01), Gaechter et al.

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