Length comparator
A length comparator , formerly also known as a longitudinal comparator , is a comparison measuring device for comparing lengths. It fulfills the ( abbe ) comparator principle established by Ernst Abbe in 1890 .
variants
- Transversal comparator
- The quantity to be measured of a specimen is, by means of gauge block or other test dimensions of a stopper and an eyepiece adjusted with graduation or 2 movable eyepieces.
- Interference comparator
- The comparator is used for precision measurement, for example of distances between spectral lines ; you can still measure lengths up to 100 nm . The interference comparator was developed in 1926 by Wilhelm Kösters in the Physikalisch-Technische Reichsanstalt (PTR) in Berlin.
literature
- H. Weise, W. Theilig: A longitudinal comparator for geodetic measuring devices. Geodetic Institute, 1966 (Google Books)
- Ruedi Thalmann: Influence Quantities for Calibrations in Dimensional Metrology , 2005, Oldenbourg doi : 10.1524 / teme.72.5.286.64798
- Karl Scheel : Fundamentals of practical metronomy , 1911, F. Vieweg and Son (Google Books)
Web links
- Further development of interferential gauge block comparators on ptb.de.
Individual evidence
- ^ Entry comparator in the Universal Lexicon.
- ↑ enzyklo.de: entry comparator .
- ↑ Wissen.de: entry comparator (physics)
- ↑ Measuring with light (PDF; 450 kB) at ptb.de, accessed on September 27, 2013.