Title: The PTB multiwavelength interferometer for distances up to 5000m
Authors: 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

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Contributors: HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:7
Language:en
DOI:10.7795/810.20240130
Resource Type: Text / Article
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Rights: Download for personal/private use only, if your national copyright law allows this kind of use.
Dates: Available: 2024-01-30
Created: 2023-03
File: Download File (application/pdf) 1.94 MB (2032281 Bytes)
MD5 Checksum: ad19b150de69942a6cc582c2d8f69a40
SHA256 Checksum: d2c847e9f2f82e5785c526876c44fe128ebc598c6b61accc6282655a08ae6350
Keywords: two-colour refractivity compensation ; multi-wavelength interferometry ; distance-measuring instrument ; system design ; long range measurement
Abstract: 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.
Citation: 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