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Page 485 of 977 Results 4841 - 4850 of 9762

Peter Lehmann, Markus Schulz
FIBER-COUPLED MICROOPTCAL INTERFEROMETRIC SENSOR FOR PRECISION ENGINEERING APPLICATIONS

Industrial inspection of precision manufactured mechanical or optical components requires flexible, accurate, fast and reasonably priced optical sensors. We present a combination of interferometric and confocal sensor based on a fiber-coupled micro-optical probe. Owing to its micro-optical realization, its low mass, and the high data rate the probe head of the sensor can be used for very fast surface contour tracking.

S. N. Makarov, S. V. Plotnikov, E. V. Sysoev, A. G. Verkhogliad, P. S. Zav’yalov, Yu. V. Chugui, A. V. Latyshev, E. S. Senchenko
3D OPTICAL MEASURING TECHNOLOGIES FOR SCIENTIFIC AND INDUSTRIAL APPLICATIONS

Solving many actual safety problems in science, atomic, optics-mechanical and railway industry takes 3D optical measuring technologies with micro-/ nanometer resolution and productivity from 100 to 105 meas./s. The novel results of the R & D activity of TDI SIE SB RAS in this field are presented.

Jürgen Czarske, Thorsten Pfister
FROM THE DOPPLER EFFECT TO ULTRAFAST DISTANCE METROLOGY

The fast inspection of technical processes gains increasing importance. Time resolved distance and shape measurements of the dynamic deformation of high speed rotating objects are challenging. The measurement rate of conventional distance sensors is limited, since their uncertainty strongly increases with the surface velocity of the inspected object. In contrast, the recently developed laser Doppler distance sensor exhibits a distance measurement uncertainty which is independent ofthe lateral surface velocity. This unique measurement feature allows ultrafast inspection of high-speed objects such as rotors of turbo machines.

A. Chijioke, R. L. Seifarth, Z. J. Kubarych
NIST 1-KILONEWTON SINE FORCE CALIBRATION SYSTEM

Many force-measurement applications are of a dynamic nature, and in recent decades there has been much progress in demonstrating and developing dynamic calibration systems for force transducers. The National Institute of Standards and Technology (NIST), U.S.A., is developing a system for sinusoidal calibration of force transducers with forces up to 1 kilonewton at frequencies up to 2 kilohertz, in a manner that is traceable to the International System of Units (SI). The system is based on harmonic excitation of a calibrated mass (m) using an electrodynamic shaker, laser interferometric measurement of acceleration (a), and voltage measurement using a calibrated fast digital voltmeter. The output voltage from a force transducer system under calibration is indexed against the input force given by F = m · a. The design and operation of the system are described.

Martin Brucke, Philipp Begoff, Michael Mende, Frank Schulz
PRIMARY CALIBRATION OF SHOCK TRANSDUCERS LASER POSITION INFLUENCES MEASUREMENT RESULTS

For the primary calibration of shock transducers according to ISO 16063-13 on a calibration system with Hopkinson-bar shock exciter a laser vibrometer is used as a reference sensor. Earlier imeko_proceedings have shown that the waves in the Hopkinson-Bar seem not to propagate exactly as plain waves and that it thus matters where the laser spot is positioned on the surface of the bar. However, in these investigations the shock duration could not be changed in a controlled way. This paper presents results from measurements by means of a special Hopkinson-bar that allows to vary the shock duration precisely and thus allows to measure the frequency dependency of such effects.

Claire Bartoli, M.Florian Beug, Thomas Bruns, Sascha Eichstädt, Trevor Esward, Leonard Klaus, Andy Knott, Michael Kobusch, Christian Schlegel
DYNAMIC CALIBRATION OF FORCE, TORQUE AND PRESSURE SENSORS

Nine European Metrology institutes (NMIs) are collaborating together to develop appropriate methods for the dynamic calibration of force, torque and pressure sensors which are only statically calibrated at present. This work is funded by the European Metrology Research Program (EMRP) within the scope of a dedicated research project which runs over three years. This article describes the current state of progress of the different parts of the project after its second year.

J. Guerrero, S. Molins, E. Álvarez, S. Álvarez, C. Fernández
A NEW TECHNOLOGY FOR DYNAMIC TORQUE MEASURING BASED ON A DIFFERENTIAL MECHANISM

A new technology demonstrated by an innovative measuring instrument is presented. This instrument is conceived to measure the dynamic torque in shafts and rotating mechanical elements. The present paper describes the instrument layout, a laboratory prototype recently developed and the results of the first tests performed on the prototype in order to study its capabilities.

Michael Kobusch, Sascha Eichstädt, Leonard Klaus, Thomas Bruns
INVESTIGATIONS FOR THE MODEL-BASED DYNAMIC CALIBRATION OF FORCE TRANSDUCERS BY USING SHOCK FORCES

To investigate and validate the approach of a model-based dynamic calibration of force transducers by using shock excitations, numerous measurements were performed at PTB’s 20 kN primary shock force calibration device. The tests included several strain gauge force transducers of greatly differing structural design, size, weight and mechanical coupling. Previous studies proved modal oscillations of the measurement set-up of various origins that limit the usable bandwidth. Their effect on the modal-based calibration method with its data analysis procedures, which are to be developed, is further investigated and discussed in this paper.

Leonard Klaus, Barbora Arendacká, Michael Kobusch, Thomas Bruns
MODEL PARAMETER IDENTIFICATION FROM MEASUREMENT DATA FOR DYNAMIC TORQUE CALIBRATION

For the dynamic calibration of torque transducers, a model of the transducer and an extended model of the mounted transducer with the measuring device have been developed. The dynamic behaviour of a torque transducer is described by model parameters. This paper describes the model with the known and unknown parameters and how the calibration measurements are going to be carried out. The principle for the identification of the transducer’s model parameters from measurement data is described using a least squares approach.

Leonard Klaus, Michael Kobusch
EXPERIMENTAL METHOD FOR THE NON-CONTACT MEASUREMENT OF ROTATIONAL DAMPING

For a model-based description of the dynamic behaviour of a dynamic torque calibration device, it is necessary to determine the model parameters. This paper describes a method for the determination of damping properties with rotational excitation. To minimise the influence of the measurement, the oscillations were investigated by non-contact measurement.

Page 485 of 977 Results 4841 - 4850 of 9762