Preliminary results of experimental tests, aimed at evaluating system performance as well as research perspectives for further improvements, are discussed.Įxternal metrology systems are increasingly being integrated with traditional industrial articulated robots, especially in Owing to its distributed nature, the system – based on a wireless network of optical devices – is portable, fully scalable with respect to dimensions and shapes and easily adaptable to different working environments. The system seems to be suitable for performing dimensional measurements of large-size objects (sizes on the order of several meters). Then, the article briefly presents a recent prototype system – the Mobile Spatial Coordinate-Measuring System (MScMS-II) – which has been developed at the Industrial Metrology and Quality Laboratory of DISPEA – Politecnico di Torino. Advantages and drawbacks of such approach are analysed and deeply discussed. This article focuses on a new possible approach to large-scale dimensional metrology based on wireless sensor networks. Each of these systems is more or less adequate, depending upon measuring conditions, user's experience and skill, or other factors such as time, cost, accuracy and portability. Nowadays, the problem can be handled using many metrological systems, based on different technologies (e.g. This task is not trivial especially when dealing with large-scale dimensional measurements: the bigger the measurement dimensions are, the harder is to achieve high accuracies. In many branches of industry, dimensional measurements have become an important part of the production cycle, in order to check product compliance with specifications. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE) The experimental data show that the 3-D coordinate measurement error has obviously decreased from 0.3 to 0.15 mm as a merit of the proposed method. As indicated by the results of the verifying experiment, the accuracy and efficiency of the transmitter calibration can be distinctly improved by using the proposed method. After the new model of transmitter parameter calibration has been explained, both the calculation method for optimization and the production of the initial iteration value are given. Several calibration points with known coordinates are set in the workspace to establish the precise 3-D coordinate control network. This paper will focus on the improvement of the transmitter parameters' calibration by using a highly precise 3-D coordinate control network. The present transmitter parameter calibration method relies on auxiliary measurement equipment, which is more error prone and less efficient. As a core part ensuring measurement accuracy, the transmitter parameters' calibration is the critical technique of the system. The workspace measurement and positioning system is a three-dimensional (3-D) coordinate system based on laser scanning, which is widely applied in large-scale metrology.

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