Ulrich Neuschaefer-Rube, Holger Bremer, Benjamin Hopp, Ralf Christoph
The fiber probe is well known in micro-coordinate metrology. The 2D version has been used for many years to measure injector nozzles, turbine blade cooling holes, and a variety of other small, tight tolerance features. A development of this probe, the 3D fiber probe, has been commercially available for some time. In a cooperation project, PTB and Werth Messtechnik have continued investigations on this microprobe. This paper reports on the recent achievements. Very small stylus tips with diameters down to 25 µm with isotropic stiffness and novel probe designs are now possible. Dual-sphere and...
TC14 LMPMI Symposium 2014
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Terutake Hayashi, Yuki Ishizaki, Masaki Michihata, Yasuhiro Takaya, Shin-Ichi Tanaka
A fluorescent polarization method is well known for the detection of complementary base pairing of DNA in biological field. The fluorescent polarization method (FP) measures the rotational diffusion coefficient of Brownian motion of the fluorescent particle in the solution. The rotational diffusion coefficient is corresponding to inverse third power of diameter due to the Einstein Stokes Relation for nanoparticle as hard sphere. We develop a novel rotational diffusion coefficient measurement method by using a fluorescent probe with DNA spacer, which is connected to particle. We investigate...
TC14 LMPMI Symposium 2014
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Rainer Tutsch, Hanno Dierke
Optical instruments are frequently used for surface topography measurement. In general their working principles can be divided into interferometric (e.g. white-light interferometers) and focus sensing (e.g. confocal microscopy) techniques. For both groups a number of systematic error sources are well known. In this paper we will concentrate on step-height measurement and take a closer look at those errors that are caused by the material properties of the workpiece, as there are: material-dependent phase-jumps on reflection, phase- and focus-shift caused by transparent layers and the effects...
TC14 LMPMI Symposium 2014
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Kazuhiro Enami
We are now developing inner shape measurement system for superconducting accelerator cavities. An acceleration cavity is shaped like bellows which have some cells. Inner shape of a cavity influences accelerating efficiency of particles. To improve and inspect accelerator cavities, we are now developing a system which can measure inner 3D shape. This system scan inner surface by inserting and rotating a laser displacement sensor unit attached to the end of the pole. This system is simple and useful not only for an accelerator cavity but also for a long pipe and a deep hole on an industrial...
TC14 LMPMI Symposium 2014
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Gavin MacAulay, Nicola Senin, Claudiu L. Giusca, Richard K. Leach
Increasing interest surrounds micro-manufacturing, in part due to the growth of structured surfaces, which require the fabrication of localised micro-scale surface features. Assessment of manufacturing process performance is critical to optimisation of the resulting product and can be addressed by inspection of the resulting geometries. The micrometre scale of features on typical structured surfaces necessitate the use of optical surface topography measuring instruments, common to surface metrology, to measure such surfaces. However, associated conventional surface texture characterisation...
TC14 LMPMI Symposium 2014
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Trung Vuong Pham, Yutaka Ohtake, Yukie Nagai, Hiromasa Suzuki
In industrial X-ray CT application, there is an increasing demand for achieving accurate surface reconstruction of measured objects for dimensional inspection of mechanical parts since the performance of industrial X-ray CT scanners is considerably improved. In this paper, we propose a novel method that reuses X-ray projection images, or a sinogram, to improve the accuracy of the reconstructed surface mesh by correcting the CT values, which is done by fitting silhouette- lines of the mesh to the sinogram. The sinogram is conventionally used only for obtaining a CT volume data, or a tomogram....
TC14 LMPMI Symposium 2014
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Ryusuke Sagawa, Tatsuya Kawamura, Ryo Furukawa, Hiroshi Kawasaki, Yoshio Matsumoto
Recently, the 3D measurement of moving objects becomes an important task in various applications. The potential applications are medical application, multimedia, crash testing, fluid analysis and so on. For these applications, the 3D measurement is required to have properties of high accuracy, high frame-rate, and high density. We have proposed a method based on a projector-camera system that reconstructs a shape from a single image where a static pattern is cast by a projector. The proposed method realizes one-shot 3D reconstruction with a single-colored pattern that consists of vertical...
TC14 LMPMI Symposium 2014
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Eiki Okuyama, Yuichi Suzuki, Masahiro Morikawa, Ichiro Yoshida
In industrial fields, it is frequently necessary to measure surface roughness in confined spaces such as boreholes and grooves. However, using a small stylus, the surface roughness of a narrow borehole can be directly measured only a few millimeters from its end; alternatively, destructive measurements must be performed. We already proposed a novel surface roughness measurement sensor. To make the surface roughness sensor small, we used a stylus with a cylindrical mirror and a lensed fiber instead of a conventional inductive pick-up. The proposed sensor converts the signal obtained by...
TC14 LMPMI Symposium 2014
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Alexander Schoch, Alessandro Salvadori, Ivo Germann, Silvano Balemi, Carlo Bach, Andrea Ghiotti, Simone Carmignato, Andrea Maurizio, Enrico Savio
The increasing quality expectations and the global competition push manufacturing industry to adopt strategies of lean manufacturing and precision engineering. In order to reach these aims it is necessary that the measuring process be integrated in the production chain to provide timely feedback for process control. Nowadays, however, forged products are typically measured after the cool-down process, which can take several hours. The advantages obtainable if forgings would be measured online are clear: deviations in the production process would be recognized earlier and the production...
TC14 LMPMI Symposium 2014
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Hiroyuki Fujimoto
Recently, a dimensional X-ray computed tomography system that is capable of dimensional measurements is strongly waited because the realization of dimensional measurements for outward forms and inward forms on dense spatial points in short time duration remarkably simplifies and accelerates production loop. However the obtained image of the XCT describes the structure clear and in great detail, the realization of the dimensional metrology by the XCT is not simple. National metrology institute of Japan have been continued the performance test using gauges that includes the gauges proposed in...
TC14 LMPMI Symposium 2014
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