| Zugriffsnummer | 39331 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Design and manufacture of a high-resolution 1D superconducting gravimeter |
| Autor(in); Institution |
Schmaljohann, Frank; 5.5, Wissenschaftlicher Gerätebau, PTB-Braunschweig
Hagedorn, Daniel; 5.5, Wissenschaftlicher Gerätebau, PTB-Braunschweig
Löffler, Frank; 5.5, Wissenschaftlicher Gerätebau, PTB-Braunschweig
|
| Quelle/Jahr | Proceedings of the 17th International Conference of the European Society for Precision Engineering and Nanotechnology:(2017), 45 - 46 |
| Herausgeber(in) |
Billington, D.
|
| ISBN | 978-0-9957751-0-7 |
| Verlag | Bedford: Euspen |
| Konferenzangaben | euspen's 17th International Conference & Exhibition, Hannover, 29, May - 02, June, 2017, Germany |
| Freie Schlagworte | superconducting gravimeter ; SQUID sensors ; instrumentation design |
| Zusammenfassung | Superconducting gravimeters are state-of-the-art for measuring the local gravitational field with highest precision. However, for significant proof of the so-called Slichter modes - a reflection of seismic waves at the Earth’s inner core boundary - the resolution is too low. The fully new gravimeter design also uses superconducting coils for the levitation of a test mass, but there are two fundamental differences: First, the detection of the variation in position of the test mass is done by SQUIDs (Superconducting QUantum Interference Device) which allows an improvement in terms of resolution by a factor of up to 100. Second, the design of the test mass was changed, having a coned opening on both sides. This leads to less weight and a smaller current needed for levitation and the change in position can actually be detected by the SQUID sensors. To avoid wobbling of the test mass after levitation, size deviations were kept down to a minimum within the range of one micrometre in a pecifically developed turning process. In comparison to a solid niobium test mass, Mg, Ti and Al alloys were coated with niobium by magnetron sputtering and tested. Furthermore, manufacturing of the levitation coils on tapered surfaces was developed, as well as coils on the inner surface of rings. |
