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The aim of this paper is to present methods of estimating and guidelines for verifying the accuracy of optical photogrammetric measuring systems, using for measurement of large size elements. Measuring systems applied to measure workpieces of a large size which often reach more than 10000mm require use of appropriate standards. Those standards provided by the manufacturer of photogrammetric systems are certified and are inspected annually. To make sure that these systems work properly there was developed a special standard VDI / VDE 2634, "Optical 3D measuring systems. Imaging systems with point - by - point probing. " According to recommendations described in this standard research on accuracy of photogrametric measuring system was conducted using K class gauge blocks dedicated to calibrate and test accuracy of classic CMMs. The paper presents results of research of estimation the actual error of indication for size measurement MPEE for photogrammetric coordinate measuring system TRITOP.
Measuring stands enabling practical implementation of the diffraction method for measuring the drop sizes of the fuel aerosol stream are presented. The construction of the diffractometer is described in which the recording of the light intensity distribution is made by scanning the image plane with a detecting system adjusted to the specificity of the image. A stand for measuring the average drop diameter in aerosols produced by fuel injectors of airplane turbine engines are presented and examples of the examination results are shown.
Content available remote Diffraction methods of drop size measurement in polydispersive media
The principles of the diffractive method of drop size determination in the aerosol stream of fuel of significant diversification of drop dimensions are presented. Three variants of data processing obtained from the light intensity distribution I(r) in the image plane are described. A comparison of both properties and applicability of the two variants is made.
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