Title: Absolute length measurement of prismatic bodies with PTB´s new double-ended interferometer under the influence of wavefront aberrations
Authors: Rau, Katharina, Physikalisch-Technische Bundesanstalt (PTB), 5.4 Interferometry on Material Measures, Braunschweig, Germany
Mai, Torsten, Physikalisch-Technische Bundesanstalt (PTB), 5.4 Interferometry on Material Measures, Braunschweig, Germany
Schödel, René, Physikalisch-Technische Bundesanstalt (PTB), 5.4 Interferometry on Material Measures, Braunschweig, Germany, ISNI: 0000 0000 1237 158X
Contributors: Editor: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887
Pages:9
Language:en
DOI:10.7795/810.20150616K
Resource Type: Text / Article
Publisher: Physikalisch-Technische Bundesanstalt (PTB)
Dates: Available: 2015-06-16
File: Download File (application/pdf) 622.77 kB (637717 Bytes)
MD5 Checksum: 3db517d55a4130aa82ea74925ac089b2
SHA256 Checksum: c26efda99dfd89be00c432cbc8d3cd37e2aa2f0f94f489b29dcf1f620ff1f893
Keywords: interferometry ; absolute length measurement ; wavefront aberrations
Abstract: Traceability of length measurements to the international system of units (SI) can be realized by using optical interferometry. This paper describes PTB´s new double-ended interferometer, which is used to determine the absolute length of prismatic bodies (e.g. gauge blocks) from the analysis of two sets of interferograms measured simultaneously on opposite sides. Wringing the gauge block to a platen to form an optical step, as it is used in traditional gauge block comparators, is not required. In return, the influence of wavefront aberrations on the measured length is increased due to larger optical path lengths. A first idea for a correction method is presented in this paper.
Other: This article is based on a presentation at the conference "MacroScale 2014 - Recent developments in traceable dimensional measurements", Vienna (Austria), 28th-30th October 2014.
Citation: RAU, Katharina, Torsten MAI and René SCHÖDEL. Absolute length measurement of prismatic bodies with PTB´s new double-ended interferometer under the influence of wavefront aberrations. Physikalisch-Technische Bundesanstalt (PTB), 2015. doi: 10.7795/810.20150616K
Remark: This article is based on a presentation at the conference "MacroScale 2014 - Recent developments in traceable dimensional measurements", Vienna (Austria), 28th-30th October 2014.