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Proceedings Paper

Development of a calibration system for electronic distance measuring instruments
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Paper Abstract

This paper describes the design of a facility to calibrate electronic distance measuring instruments (EDMs), as used in surveying (electronic theodolites) and large scale industrial measurement, over the range of 0 to 60 m. The combined uncertainty of the system at 60 m, estimated at the 95 percent confidence level, is expected to be 0.4 mm. The EDM is compared with a heterodyne laser measurement system in a back-to-back configuration. The trolley carrying the optics travels on aluminium rails. In order to improve the straightness of the path followed by the reflectors during measurement, the trolley optics are mounted on a two-axis motorized translation stage which uses a quadrant diode to track an additional guiding laser beam parallel to the required path. Once programmed, the trolley tracking electronics are autonomous and no connection is necessary to external power or control sources for that. However, radio frequency remote control of the motor propelling trolley motor would assist the measurements.

Paper Details

Date Published: 22 October 2001
PDF: 8 pages
Proc. SPIE 4401, Recent Developments in Traceable Dimensional Measurements, (22 October 2001); doi: 10.1117/12.445609
Show Author Affiliations
Lucy C. Forde, Industrial Research Ltd. (New Zealand)
Eleanor F. Howick, Industrial Research Ltd. (New Zealand)

Published in SPIE Proceedings Vol. 4401:
Recent Developments in Traceable Dimensional Measurements
Jennifer E. Decker; Nicholas Brown, Editor(s)

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