| Zugriffsnummer | 18005 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Nuclear magnetic precession at very low fields measured by SQUIDs |
| Autor(in); Institution |
Hartwig, Stefan; 8.2, Biosignale, PTB-Berlin
Burghoff, Martin; 8.2, Biosignale, PTB-Berlin
Bernarding, Johannes; Otto-von-Guericke Universität Magdeburg, GERMANY
Trahms, Lutz; 8.2, Biosignale, PTB-Berlin
|
| Quelle/Jahr | Biomedizinische Technik: 50 (2005), Suppl. 1, Part 1, 167 - 168 |
| ISSN | 0939-4990 |
| Verlag | Berlin: Fachverlag Schiele & Schön GmbH |
| Konferenzangaben | BMT 2005, 39th Annual Congress of the German Society for Biomedical Engineering (DGBMT) within VDE, Nürnberg, 14-17, September, 2005, Germany |
| Zusammenfassung | We have developed a SQUID system measuring nuclear magnetic precession at very low fields with a spectral resolution beyond the natural line width of liquids. A coil system applies a magnetic polarization field and a perpendicular static detection field to the sample. The detection system consists of LTc-SQUID sensors in a liquid helium cryostat. We measured the 1H precession signal of benzene, distilled water and chloroform samples at various detection fields. With our set-up, broad band detection of the nuclear magnetic resonance of the investigated liquids with a very high resolution is possible. Benzene showed the narrowest natural resonance line width of 0.12 Hz followed by chloroform of about 0.17 Hz. The observed line widths increased linearly with the detection field with a slope independent of the investigated sample. This increase is attributed to the inhomogeneity of the detection field, rather than to intrinsic properties of the investigated liquids, and thus describes the properties of our measurement system. |
