Hughes, B; Campbell, M A; Lewis, A J; Lazzerini, G M; Kay, N (2017) Development of a high-accuracy multi-sensor, multi-target coordinate metrology system using frequency scanning interferometry and multilateration. Proceedings of SPIE, 10332. 1033202

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Abstract

We present a novel coordinate measurement system based on a combination of frequency scanning interferometry and multilateration. The system comprises a number of sensors (minimum of four) that surround the measurement volume. Spherical glass retro-reflectors act as targets that are usued to define the points in space to be measured. The sensors all measure the absolute distance to all targets simultaneously. The resulting distances are then used to compute the coordinates of the targets and other systematic parameters such as the sensor locations.
Initial experimental comparison with a commercial laser tracker has shown that the proposed system is capable of achieving coordinate uncertainties of the order of 40 µm in a measurement volume of 10 m ×x 5 m ×x 2.5 m.
The system is self-calibrating, inherently traceable to the international system of units, the SI and computes rigorous coordinate uncertainty estimates

Item Type:	Article
Keywords:	Frequency scanning interferometry, coordinate metrology, self-calibration, multilateration
Subjects:	Engineering Measurements > Dimensional
Divisions:	Engineering, Materials & Electrical Science
Identification number/DOI:	10.1117/12.2273644
Last Modified:	02 Mar 2018 11:42
URI:	http://eprintspublications.npl.co.uk/id/eprint/7762

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