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Abstract: We have developed a contact-free 2-dimensional laser sensor with which theposition of wires can be measured in 3 dimensions with an accuracy of betterthan 10 micrometer and with which the tension of the wires can be determinedwith an accuracy of 0.04 N. These measurements can be made from a distance of15 cm. The sensor consists of commercially available laser pointers, lenses,color filters and photodiodes. In our application we have used this lasersensor together with an automated 3 dimensional coordinate table. For a singleposition measurement, the laser sensor is moved by the 3-dimensional coordinatetable in a plane and determines the coordinates at which the wires intersectwith this plane. The position of the plane itself the third coordinate isgiven by the third axis of the measurement table which is perpendicular to thisplane. The control and readout of the table and the readout of the laser sensorwere realized with LabVIEW. The precision of the position measurement in theplane was determined with wires of 0.2 mm and 0.3 mm diameter. We use thesensor for the quality assurance of the wire electrode modules for the KATRINneutrino mass experiment. We expect that the precision is at least comparableor better if the wires are thinner. Such a device could be well suited for themeasurement of wire chamber geometries even with more than one wire layer.



Author: Matthias Prall, V. Hannen, R. Joehren, H.W. Ortjohann, M. Reinhardt, Ch. Weinheimer

Source: https://arxiv.org/



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