Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1978-08-04
1980-09-02
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 906
Patent
active
042199409
ABSTRACT:
A gyroless vertical indicating device which tracks the local gravity vector independent of horizontal acceleration. A compound pendulum and an angular accelerometer each has a single rotational degree of freedom about a common axis. Rotational motion of the pendulum and of the angular accelerometer about the axis is coupled by a quartz fiber suspension therealong. A signal representative of the relative angular velocity between the pendulum and the angular accelerometer is fed back to a torquing system which maintains the pendulum's orientation along the local gravity vector.
REFERENCES:
patent: 2497607 (1950-02-01), Herr
patent: 2942864 (1960-06-01), Sikora
patent: 3537307 (1970-11-01), Pliha
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