Measurements

Distributed Large-Scale Dimensional Metrology: New Insights by Fiorenzo Franceschini, Maurizio Galetto, Domenico Maisano,

By Fiorenzo Franceschini, Maurizio Galetto, Domenico Maisano, Luca Mastrogiacomo, Barbara Pralio

The box of large-scale dimensional metrology (LSM) offers with items that experience linear dimensions starting from tens to countless numbers of meters. It has lately attracted loads of curiosity in lots of parts of construction, together with the automobile, railway, and shipbuilding sectors.

Distributed Large-Scale Dimensional Metrology introduces a brand new paradigm during this box that reverses the classical metrological method: measuring structures which are transportable and will be simply moved round the place of the measured item, that is best to relocating the item itself.

Distributed Large-Scale Dimensional Metrology combines the suggestions of dispensed platforms and large-scale metrology on the software point. It makes a speciality of the most recent insights and demanding situations of this new iteration of structures from the viewpoint of the designers and builders. the most themes are:

  • coverage of measuring area,
  • sensors calibration,
  • on-line diagnostics,
  • probe administration, and
  • analysis of metrological performance.

The common descriptions of every subject are extra enriched by way of particular examples about the use of commercially to be had structures or the improvement of latest prototypes. this may be fairly valuable for pro practitioners corresponding to caliber engineers, production and improvement engineers, and procurement experts, yet Distributed Large-Scale Dimensional Metrology additionally has a wealth of knowledge for academics.

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Extra info for Distributed Large-Scale Dimensional Metrology: New Insights

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2011). (with permission) distributed network portable probe processing unit measured object way of example, two of the more relevant distributed metrology solutions are briefly described: the HiballTM and a Photogrammetric System. They represent two typical instances of implementation of optical technology in order to obtain dimensional measurement with the triangulation technique. Among the other distributed systems, iGPSTM will be described in detail in Chap. 2, while the two innovative systems MScMS-I and MScMS-II will be presented in Chap.

This is due to the localisation method used. The position of each sensor can be calculated by triangulation using the two angles (u and h) from each transmitter. Transmitter sampling rate depends on the angular speed of its rotating head. As explained above, spinning speed is unique for each transmitter to be differentiated. Assuming the rotation speed around 3,000 rpm, each transmitter is able to communicate with sensors about 50 times per second. Even though the differences in the transmitter sampling rate are small, it is impossible to receive concurrent data from all transmitters.

This approach allows an unlimited number of sensors to continuously and independently calculate positional data. 1. For a detailed description of the satellite-based GPS, we refer the reader to the literature (Hofmann-Wellenhof et al. 2001). Going back to the description of iGPSTM, measurements are taken by touching the required points on the object’s surface with a probe that is equipped with a pair of sensors. Points are defined on a Cartesian coordinate system; the coordinates are F. 1007/978-0-85729-543-9_2, Ó Springer-Verlag London Limited 2011 23 2 Indoor GPS (iGPSTM) 24 (a) (b) transmitter 2 transmitter 1 portable probe measured object processing unit measured point sensors transmitter 3 transmitter 4 Fig.

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