| Zugriffsnummer | 22312 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | A nanoforce facility and a novel method for measurements of the air and vacuum permittivity at zerofrequencies |
| Autor(in); Institution |
Nesterov, Vladimir; 5.1, Oberflächenmesstechnik, PTB-Braunschweig
|
| Quelle/Jahr | Measurement Science and Technology: 20 (2009), 8, 084012-1 - 084012-6 |
| ISSN | 0957-0233 |
| DOI | |
| URL | |
| Verlag | Bristol: IOP |
| Konferenzangaben | Nanoscale 2008, 8th Seminar on Quantitative Microscopy (QM) and 4th Seminar on Nanoscale Calibration Standards and Methods, Torino, 22-23, September, 2008, Italy |
| Freie Schlagworte | nanonewton ; electrostatic stiffness reduction ; disk-pendulum ; permittivity of the vacuum ; dispersion of the vacuum |
| Zusammenfassung | A nanonewton force facility, based on a disk-pendulum with electrostatic stiffness reduction and electrostatic force compensation, for the measurement of horizontal forces in the range below 1 μN, is presented. It consists of a measuring system and an identical reference system. Recent experiments with the nanonewton force facility have achieved agreement between an electrostatic force and a gravitational force of 80 nN with an uncertainty of less than 3%. A novel method for measurements of the air (vacuum) permittivity at zero frequencies by means of the nanonewton force facility is presented. First measurements in air show a permittivity of the air ε ≈ 8.71 × 10-12 F m-1 with an uncertainty of 3%. From a theoretical analysis, it follows that this method can be used for the measurement of the vacuum permittivity ε0 at zero frequencies with a relative uncertainty of about 10-5. The precise measurement of the vacuum permittivity ε0 for an electrostatic field would be another test for the correctness of Maxwell’s equations. |
