22 October 2001 Traceable measurements for tape benches made easy
Author Affiliations +
Proceedings Volume 4401, Recent Developments in Traceable Dimensional Measurements; (2001) https://doi.org/10.1117/12.445610
Event: Lasers in Metrology and Art Conservation, 2001, Munich, Germany
Laser interferometers provide an easy path for traceable measurements as most commercial instruments are inherently accurate to better than 10-7. The main problem with using these interferometers over an extended path can be the alignment requirements which can only be met with a precision rail system. Tape benches are typically 50 m (or more) long and are easily affected by building movement, requiring frequent re-alignment. An interferometer with an expanded measurement beam has significantly reduced alignment requirements and one with a beam diameter of 45 mm was used by the author to measure survey pillars. This had an alignment tolerance of +/- 10 mm allowing the use of a simple stretched wire rail system. This paper describes a simple adaptation that can be made to a commercial interferometer to expand the measurement beam without interfering with its normal operation.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nicholas Brown, Nicholas Brown, } "Traceable measurements for tape benches made easy", Proc. SPIE 4401, Recent Developments in Traceable Dimensional Measurements, (22 October 2001); doi: 10.1117/12.445610; https://doi.org/10.1117/12.445610

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