405 research outputs found
Experimental study on performance verification tests for coordinate measuring systems with optical distance sensors
No full textOptical sensors are increasingly used for dimensional and geometrical metrology. However, the lack of international standards for testing optical coordinate measuring systems is currently limiting the traceability of measurements and the easy comparison of different optical systems. This paper presents an experimental investigation on artefacts and procedures for testing coordinate measuring systems equipped with optical distance sensors. The work is aimed at contributing to the standardization of testing methods. The VDI/VDE 2617-6.2:2005 guideline, which is probably the most complete document available at the state of the art for testing systems with optical distance sensors, is examined with specific experiments. Results from the experiments are discussed, with particular reference to the tests used for determining the following characteristics: error of indication for size measurement, probing error and structural resolution. Particular attention is given to the use of artefacts alternative to gauge blocks for determining the error of indication for size measurement
Calibration
No full textCalibration: operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication
Computed tomography as a promising solution for industrial quality control and inspection of castings
No full textRecently X-ray Computed Tomography (CT) has successfully entered the field of industrial quality control, with interesting applications also for metal casting industry, including non-destructive testing and dimensional metrology. In particular, CT benefits of several advantages with respect to traditional dimensional measuring systems, as for example: simultaneous dimensional quality control and material quality control, non-destructive inspection of internal as well as external geometries, and reconstruction of complete and high-density point-clouds in relatively short time.
Due to these advantages, CT is increasingly recognised as a very promising non-contact measuring technique and, therefore, several manufacturers and research centres are now investing in the further development of metrological CT systems and in widening their application in industry.
This paper investigates accuracy and traceability of dimensional measurements carried out by state of-the- art industrial CT systems, by examining selected results obtained from the “CT Audit” project, which is the first international interlaboratory comparison of CT systems for dimensional metrology. The project was organized by the Laboratory of Industrial and Geometrical Metrology, University of Padova, Italy, and was carried out in the period from September 2009 to June 2011, involving 15
CT systems, from research institutions and companies working actively on industrial CT metrology in Europe, America and Asia
Vantaggi e principi di funzionamento delle nuove tecnologie di misurazione senza contatto
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