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  • 1.
    Albani, Giorgia
    et al.
    University of Milano Bicocca, Italy; Ist Nazl Fis Nucl, Italy.
    Perelli Cippo, Enrico
    CNR, Italy.
    Croci, Gabriele
    University of Milano Bicocca, Italy; Ist Nazl Fis Nucl, Italy.
    Muraro, Andrea
    CNR, Italy.
    Schooneveld, Erik
    Rutherford Appleton Lab, England.
    Scherillo, Antonella
    Rutherford Appleton Lab, England.
    Hall-Wilton, Richard
    European Spallat Source ERIC, Sweden; Mittuniversitetet, Sweden.
    Kanaki, Kalliopi
    European Spallat Source ERIC, Sweden.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC, Sweden.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Birch, Jens
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
    Claps, Gerardo
    Ist Nazl Fis Nucl, Italy.
    Murtas, Fabrizio
    Ist Nazl Fis Nucl, Italy.
    Rebai, Marica
    University of Milano Bicocca, Italy; Ist Nazl Fis Nucl, Italy.
    Tardocchi, Marco
    CNR, Italy.
    Gorini, Giuseppe
    University of Milano Bicocca, Italy; CNR, Italy; Ist Nazl Fis Nucl, Italy.
    Evolution in boron-based GEM detectors for diffraction measurements: from planar to 3D converters2016In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 27, no 11, article id 115902Article in journal (Refereed)
    Abstract [en]

    The so-called He-3-crisis has motivated the neutron detector community to undertake an intense Ramp;D programme in order to develop technologies alternative to standard He-3 tubes and suitable for neutron detection systems in future spallation sources such as the European spallation source (ESS). Boron-based GEM (gas electron multiplier) detectors are a promising He-3-free technology for thermal neutron detection in neutron scattering experiments. In this paper the evolution of boron-based GEM detectors from planar to 3D converters with an application in diffraction measurements is presented. The use of 3D converters coupled with GEMs allows for an optimization of the detector performances. Three different detectors were used for diffraction measurements on the INES instrument at the ISIS spallation source. The performances of the GEM-detectors are compared with those of conventional He-3 tubes installed on the INES instrument. The conceptual detector with the 3D converter used in this paper reached a count rate per unit area of about 25% relative to the currently installed He-3 tube. Its timing resolution is similar and the signal-to-background ratio (S/B) is 2 times lower.

  • 2.
    Båvall, Lennart
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Determination of the thickness of copper coatings on steel by measuring the impedance of a thin elliptic coil2002In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 13, no 4, p. 510-519Article in journal (Refereed)
    Abstract [en]

    When a thin elliptically shaped coil is placed above a flat plate with a coat of metal, the magnetic fields in the vicinity of the coil is altered by eddy currents in the plate and the coat. The thickness of the coat influences the magnetic field and can be determined by measuring the coil impedance. An electromagnetic model utilizing an elliptic cylinder coordinate system accounting for the coil impedance with different values on the numerical eccentricity and the coating thickness is described. The model is based on a potential formulation of the problem from which the magnetic vector potential and hence the impedance is evaluated. The derivation utilizes a proper choice of the transversal field, giving a scalar Helmholtz equation in which the solution to the boundary value problem is separated. The resulting integral equation is expressed in closed form in terms of Mathieu functions. Numerical calculations and experimental measurements show how the model can be used to model a steel surface with a coat of copper to find expected impedance as function of the coating thickness.

  • 3.
    Båvall, Lennart
    et al.
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Karlsson, Nils
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Capacitive detection of humans for safety in industry: a numerical and experimental investigation1998In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 9, no 3, p. 505-509Article in journal (Refereed)
    Abstract [en]

    The detection of humans for their own safety in an industrial environment is vital, especially with increases in the flexibility and velocity of automated working machines. A capacitive detector for the detection of humans in guarded zones has been designed. An electromagnetic model accounting for bodies of different permittivity in the vicinity of the sensor is described. Numerical calculations based on the electromagnetic model have been made and experimental measurements have been taken. An example shows how the electromagnetic model can be used to model the output of the person detector.

  • 4.
    Holmin, Susanne
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Krantz-Rülcher, Christina
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Winquist, Fredrik
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Drift correction of electronic tongue responses2001In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 12, no 8, p. 1348-1354Article in journal (Refereed)
    Abstract [en]

    In this article, drift correction algorithms were used in order to remove linear drift in multivariate spaces of two data sets obtained by an electronic tongue based on voltammetry. The electronic tongue consisted of various metal electrodes (Au, Ir, Pt, Rh) combined with pattern recognition tools, such as principal component analysis. The first data set contained different types of liquid, from well defined to more complex solutions. The second data set contained different black and green teas. Component correction (CC) was compared to a simple additive correction. In CC, the drift direction of measured reference solutions in a multivariate space was subtracted from other types of solution. In additive correction, responses from reference samples were subtracted from other samples. CC showed similar or better performance in reducing drift compared to additive correction for the two data sets. The additive correction method was dependent on the fact that the differences in between samples of a reference solution were similar to the changes in between samples of other liquids, which was not the case with CC.

  • 5.
    Johansen, Knut
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Stalberg, R.
    Stålberg, R., Høgskolen i Telemark, Hallvard Eikas plass, 3800 Bø, Norway.
    Lundström, Ingemar
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
    Liedberg, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Surface plasmon resonance: Instrumental resolution using photo diode arrays2000In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 11, no 11, p. 1630-1638Article in journal (Refereed)
    Abstract [en]

    Surface plasmon resonance (SPR) sensors are used to study biomolecular interactions. We have performed a theoretical analysis of a SPR instrument using a convergent beam, a linear detector with various numbers of pixels and various analogue-to-digital converters (ADCs) with a corresponding resolution ranging from 8 to 16 bits. Studies of small molecules at low concentrations or with low affinities are limited by the instrumental set-up, e.g. by the resolution, linearity and noise. The amplitudes of these parameters are highly dependent on the detector, ADC and dip-finding algorithm used. We have studied several dip-finding algorithms, e.g. intensity measurements, second- and third-order polynomial fits and centroid algorithms. Each algorithm used with the ADC and the detector has a resolution associated with it. Some algorithms also have an intrinsic algorithm error that is dependent on the number of pixels and the shape of the dip. A weighted centroid algorithm that has an excellent overall performance is described. If an accuracy of 10-6 refractive index units (RIU) is satisfactory, a 12-bit ADC and a 64-pixel detector are appropriate. Theoretically, by using a 16-bit ADC and a 1024-pixel detector, a resolution of better than 10-9 RIU is obtainable.

  • 6. Karlsson, B
    et al.
    Järrhed, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Recycling of electrical motors by automatic disassembly2000In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 11, no 4, p. 350-357Article in journal (Refereed)
    Abstract [en]

    This paper presents a robotized workstation for end-of-life treatment of electrical motors with an electrical effect of about 1 kW. These motors can. for example, be found in washing machines and in industry. There are two main steps in the work. The first step is an inspection whereby the functionality of the motor is checked and classification either for re-use or for disassembly is done. In the second step the motors classified for disassembly are disassembled in a robotized automatic station. In the initial step measurements art, performed during a start-up sequence of about 1 s. By measuring the rotation speed and the current and voltage of the three phases of the motor classification for either reuse or disassembly can be done. During the disassembly work, vision data are fused in order to classify the motors according to their type. The vision system also feeds the control system of the robot with various object co-ordinates, to facilitate correct operation of the robot. Finally, tests with a vision system and eddy-current equipment are performed to decide whether all copper has been removed from the stator.

  • 7.
    Macken, Stephen
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, Faculty of Science & Engineering.
    Filippini, Daniel
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
    Colour moire interferometry for physical sensing using a standard web camera2010In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 21, no 10, p. 105305-Article in journal (Refereed)
    Abstract [en]

    Digital moire patterns are an effect seen in digital pictures when a high-contrast periodic object being imaged interferes with the periodic image detector in the camera. This is often an undesired effect, which is usually removed through various filtering processes. However in this work we demonstrate the ability to use a deliberately created moire pattern to measure the physical distance of an object from a web camera with a resolution of 131 mu m. This measurement principle is then adapted to measure weight as a ubiquitous scale with a resolution of 240 mu g.

  • 8.
    van Noort, Danny
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biotechnology . Linköping University, The Institute of Technology.
    Rumberg, Jens
    School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand.
    Jager, Edwin
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
    Mandenius, Carl-Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Biotechnology . Linköping University, The Institute of Technology.
    Silicon based affinity biochips viewed with imaging ellipsometry2000In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 11, no 6, p. 801-Article in journal (Refereed)
    Abstract [en]

    In this paper we report on the fabrication of an affinity biochip with a matrix of 900 targets for detection with imaging ellipsometry. Two methods of fabrication of chips are shown: one based on wet etching of a silicon surface and the other on the preparation of so-called tension wells on the silicon surface. The dispensing of reagents and ligands was performed using a pipetting robot equipped with a micro-capillary, a syringe pump and micro-stepping motors. Measurements were performed on the chips in real time with carbohydrate model substances selected for six common lectins. Affinity binding was shown for three of the tested model substances.

  • 9.
    Vitucci, G.
    et al.
    Univ Milano Bicocca, Italy.
    Minniti, T.
    STFC Rutherford Appleton Lab, England.
    Angella, G.
    IENI CNR, Italy.
    Croci, G.
    Univ Milano Bicocca, Italy.
    Muraro, A.
    Univ Milano Bicocca, Italy.
    Höglund, Carina
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering. European Spallat Source ERIC, Sweden.
    Lai, C. C.
    European Spallat Source ERIC, Sweden.
    Cippo, E. Perelli
    IFP CNR, Italy.
    Albani, G.
    Univ Milano Bicocca, Italy.
    Hall-Wilton, R.
    European Spallat Source ERIC, Sweden; Mittuniversitetet, Sweden.
    Robinson, Linda
    European Spallat Source ERIC, Sweden.
    Grosso, G.
    IFP CNR, Italy.
    Tardocchi, M.
    IFP CNR, Italy.
    Gorini, G.
    Univ Milano Bicocca, Italy.
    Measurement of the thickness of B4C layers deposited over metallic grids via multi-angle neutron radiography2019In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 30, no 1, article id 015402Article in journal (Refereed)
    Abstract [en]

    At the present time, different kinds of thermal neutron detectors are under development at the European Spallation Source research facility, in order to overcome the well-known problem of the He-3 shortage. One of these new systems relies on the use of a 3D neutron convener cathode that consists of a stack of aluminum grids, covered by a 0.9 mu m B-10 enriched boron carbide layer ((B4C)-B-10). As the conversion efficiency is a function of the boron thickness and the mean free path of the charged particles produced in the neutron induced reaction, the characterization of the boron carbide layer uniformity over the grids becomes crucial. In this work, a non-destructive method to map the thickness distribution of the converter layer over the grids is shown. The measurements exploit the white-beam neutron radiography technique where the specimen is irradiated at different angles. This experiment has been performed at the IMAT beamline operating at the ISIS spallation neutron source (UK). The results confirm that this non-destructive, wide-ranging technique allows a reliable and fast sample characterization and that it may be exploited in similar analyses where equivalent requirements are requested.

  • 10.
    Wang, Guoliang
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Arwin, Hans
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Optics .
    Return-path ellipsometry in gas sensing2003In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 15, p. 216-220Article in journal (Refereed)
1 - 10 of 10
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