Method and device for measuring vertical movements in the absenc

Details Method and device for measuring vertical movements in the absenc Method and device for measuring vertical movements in the absenc

1989-02-28

1990-06-12

Ruehl, Charles A.

Measuring and testing

Meteorology

Electric disturbance

G01C 1300

Patent

active

049322486

ABSTRACT:
A method and device are provided for measuring the vertical movements of a floating object, for example, in the absence of a fixed reference point. Using a differential pressure sensor, the pressure difference is measured which prevails at a measurement position on the floating object, between the instantaneous atmospheric pressure and a reference pressure which is the atmospheric pressure prevailing in a container in communication with an element for damping the instantaneous pressure fluctuations, comprising a capillary tube. A regulation loop compensates more particularly for the temperature variations. By means of another loop, the influence of the very slow variations and of the local static pressure on the signal delivered by said sensor may also be corrected. Variations of altitude of 10 cm may for example be measured with said device.

REFERENCES:
patent: 2766622 (1956-10-01), Johnson
patent: 4104608 (1978-08-01), Melling et al.
patent: 4184368 (1980-01-01), Frosch
patent: 4507971 (1985-04-01), Vachek

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