Astasis
Astasis (astatic, Greek ástatos: inconsistent) is a method for eliminating the effects of electrical and magnetic interference fields in precision measuring devices and increasing the sensitivity of rotary spring gravimeters .
Procedural principle
Spring gravimeters make use of the non-linear relationship between attacking gravity and opposing spring force . By adapting the geometry, the static equilibrium is shifted towards the astatic state, so that the position of the test mass changes more strongly in the event of a differential change in gravity. (See also: relative gravimeter )
To cancel the influence of the directional force of the earth's magnetism on a magnetic needle, a magnet is placed in the vicinity of the needle in a suitable manner so that its directional force is equal to and opposite to that of the earth.
Web links
- Astasierung ( Memento from June 11, 2007 in the Internet Archive ) in script for the lecture "Seismological Measurement Technology" (University of Karlsruhe)
Individual evidence
- ↑ Astasierung , Lexicon of Geosciences, Spektrum.de, accessed on May 4, 2016