S. Takagi, Y. Tanaka, Y. Seino
COMPARISON OF MICROSCOPIC OBSERVATION TECHNIQUES TO DETERMINE VICKERS INDENTATION DIAGONAL LENGTH

In order to investigate the best way to determine the diagonal length of a Vickers indentation, bright-field (BF), dark-field (DF), differential interference contrast (DIC) and confocal scanning microscopy is utilized to observe indentations on various samples. Each of BF, DF and DIC methods has advantage and disadvantage and evaluated values should be considered carefully. 3D feature of indentation evaluated with a confocal microscope gives useful information about it. To eliminate the effect of focusing error, focus stacking technique is quite efficient and expected to reduce the uncertainty of measurement of diagonal length. The roughness of sample surface should be taken into account but not only the amplitude parameter, Ra, but also the wavelength parameter, RSm.

M. Solecki, T. Szumiata, M. Rucki
CONSTRUCTION OF A HYBRID ROBOT INTENDED FOR MASS STANDARD COMPARISON, EQUIPPED WITH A SUSPENDED SELF-CENTRING WEIGHING PAN

The subject of this article is the development of innovative construction solutions as well as the determination of metrological parameters of the robotic mass comparator with 1 µg resolution. The instrument is intended for mass standards from 10 g up to 200 g.
The described construction, being an innovation when compared to other robotic mass comparators, has enabled the use of a suspended self-centring weighing pan, eliminating eccentricity errors.

Sun Qinmi, Li Haibin, Li Xuefei
DERIVATION AND DETERMINATION ANALYSIS OF THE MASS OF STEEL ANVIL USED FOR VERIFYING REBOUND TEST HAMMER

This paper describes the derivation process of steel anvil mass. According to the law of conservation of energy, through the analysis and calculation of impact dynamics in the impact verification process of rebound test hammer, the source of technical indicators of steel anvil for rebound test hammer is pointed out. According to the derivation, the mass of steel anvil is calculated to be 16.1 kg, which is consistent with the mass of steel anvil actually used. The scientific traceability is verified theoretically and practically. It is convenient for the measurement of the relevant indexes of the rebound instrument and the manufacture and use of the standard steel anvil.

N. Rogge, O. Dannberg, M. Kühnel, T. Fröhlich
A NOVEL EMFC TILTMETER WITH EXTENDED MEASUREMENT RANGE

This work presents a new tiltmeter that utilises the principle of electromagnetic force compensation (EMFC) in order to increase its measurement range and measurement dynamics compared to an uncompensated pendulum tiltmeter. The development included investigations on the design of the pendulum mechanics, the position sensor and the actuators. With the chosen parameters a resolution of 1 µrad in a measurement range of 20 mrad can be achieved currently on a short-term timescale.

R. S. Oliveira, P. Weidinger, Z. Song, L. Vavrečka, J. Fidelus, T. Kananen, S. Kilponen
TRANSDUCER RESPONSE UNDER NON-STANDARDISED TORQUE LOAD PROFILES

In nacelle system test benches, different wind profiles are simulated by applying different torque loads and rotational speeds amongst other things. Unlike load sequences during calibration measurements, these profiles are neither constant nor increasing and decreasing through controlled steps. This article proposes a sequence of partial range and shuffled torque load tests that combine torque rates and filter settings to evaluate parameters affecting the measurement results, such as output sensitivity, linearity, and hysteresis.