Measuring and testing – Gravitational determination
Patent
1987-03-03
1989-04-11
Chapman, John
Measuring and testing
Gravitational determination
73517R, G01P 1508, G01V 702
Patent
active
048194867
ABSTRACT:
A device for acceleration measurements and, in particular, for gravitational field measurements in, for example, earth orbits, which has a body arranged movably in a force field, the position of which can be detected by a position location device. The force acting upon the body is anisotropic and, at least in the direction of the acceleration to be determined, is not a linear function of the deflection of the body from its resting position. In a preferred further development the body is suspended by four tension springs, which in the resting position of the body are arranged in a plane perpendicular to the direction of the acceleration to be determined, and which each form right angles with the adjacent spring. With 3 separate optoelectronic position detector receivers plus corresponding illuminators which provides some measurement redundancy, all acceleration planes can be measured with a great dynamic range. In the main direction, forces as small as 10.sup.-12 g will be measurable. With the position detectors, the device is much simpler and more compact than interferometric devices at equal precision. Other embodiments are described.
REFERENCES:
patent: 2331904 (1943-10-01), Gustafsson et al.
patent: 3664196 (1972-05-01), Codina
patent: 3713343 (1973-01-01), Segerdahl et al.
patent: 4315433 (1982-02-01), Edelman et al.
Keller Karl
Kunkel Bernd
Lutz Reinhold
Chapman John
Messerschmitt-Bolkowe-Blohm GmbH
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