| Titel: | The PTB multiwavelength interferometer for distances up to 5000m |
| Autoren: |
Köchert, Paul, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 5.4, Interferometrie an Maßverkörperungen Meyer, Tobias, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 5.4, Interferometrie an Maßverkörperungen Yan, Hongdan, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 5.4, Interferometrie an Maßverkörperungen Sauthoff, Anni, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 5.4, Interferometrie an Maßverkörperungen Prellinger, Günther, Physikalisch-Technische Bundesanstalt (PTB), Fachbereich 5.4, Interferometrie an Maßverkörperungen Alle Autoren anzeigen (6) |
| Beitragende: | HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887 |
| Seiten: | 7 |
| Sprache: | en |
| DOI: | 10.7795/810.20240130 |
| Art der Ressource: | Text / Article |
| Herausgeber: | Physikalisch-Technische Bundesanstalt (PTB) |
| Rechte: | Download for personal/private use only, if your national copyright law allows this kind of use. |
| Daten: |
Verfügbar: 2024-01-30 Erstellt: 2023-03 |
| Datei: |
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| Schlagworte | two-colour refractivity compensation ; multi-wavelength interferometry ; distance-measuring instrument ; system design ; long range measurement |
| Zusammenfassung: | The measurement of distances by optical techniques relies on the knowledge of the speed of light in the atmosphere, i.e. the air refractive index. The meteorological conditions must be very well-known to make measurements down to the level of 1 × 10-7 by tracking along a measurement path the ambient conditions and using them for correction methods. The relative uncertainties during measurements through the atmosphere are therefore limited by the major challenge to determine the refractive index. A method for finding in situ the absolute distance and refractive index takes advantage of the dispersive characteristic of air when simultaneously measuring distances with multiple wavelengths. This approach results in much less dependence on accurate determination of atmospheric parameters and does not require their cumbersome recording via sensor networks. To measure long distances with this technique, the PTB has been developing such distance measuring interferometer systems for more than 10 years. The latest system, the so-called TeleYAG-II, has conceptually been designed to serve as a standard to disseminate the SI-unit meter over baseline distances up to 5000 m with an uncertainty below 1 mm. |
| Zitierform: | Köchert, Paul, et Al. The PTB multiwavelength interferometer for distances up to 5000m. Physikalisch-Technische Bundesanstalt (PTB), 2023. Verfügbar unter: https://doi.org/10.7795/810.20240130 |