Equipment for measuring a difference in elevation
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United States of America Patent
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Feb 11, 1992
Issued Date -
N/A
app pub date -
Sep 12, 1990
filing date -
Apr 8, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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