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Thomas Bruns, Alfred Link, Franko Schmähling, Holger Nicklich, Clemens Elster
CALIBRATION OF ACCELEROMETERS USING PARAMETER IDENTIFICATION – TARGETING A VERSATILE NEW STANDARD

The currently established documentary standards for primary accelerometer calibration provide a characterisation of the device under test which is not well suited for the application to transient excitations. The model based parameter identification (MBPI) introduced over the last years may provide better means of characterisation for such types of applications. The method was recently validated with extensive measurement series in a joint research project between PTB and the company "SPEKTRA Schwingungstechnik und Akustik GmbH Dresden" and is now considered by the authors to be ready for practical use and worthwhile to be standardized on an ISO level.
This contribution will shortly re-visit the methodology of MBPI, report on the validation process and finally describe the current effort to implement a new ISO documentary standard on the topic.

Maik Rosenberger, Mathias Schellhorn, Martin Correns, Maik Schumann, Michael Vogel, Gerhard Linß
A NOVEL APPROACH FOR TEACHING DIGITAL IMAGE PROCESSING BASED ON A NEW MULTI-SCALABLE HARDWARE PLATFORM

This paper highlights the capabilities and significance of a new multi-scalable hardware platform developed at image processing research group of the Ilmenau University of Technology. The main objective is a combination of theory and practice in the education of image processing. The use of image processing for measurement tasks becomes more frequently. The aspect like a camera works is taught, however frequently it cannot be practically experienced by the students. Due to the increasing miniaturization purchased cameras are not suitable for this object.
The hardware with the corresponding training modules presented in this paper give a novel approach to close this gap. Thru the modular structure, students are allowed to solve problems iterative.

Martin Correns, Maik Schumann, Holger Weissensee, Maik Rosenberger, Mathias Schellhorn, Gerhard Linß
NEW DEMOSAICING ALGORITHM ESPECIALLY FOR MEASUREMENT OF GEOMETRIES BY IMAGE PROCESSING

Most cost-effective colour cameras have single image sensors with a fixed repeating pattern of colour filters with transmission spectra analogous to the human eye. To reconstruct a full colour image a process often referred to as "demosaicing" is necessary. Almost every past method for demosaicing had the intention to create the most pleasant image for the human observer. For dimensional measurement the priority is to create images without geometric errors, while the aesthetics of an image should only be the second priority. From a metrological point of view, the most important issue with this type of raw image data is that the three channels all have different pixel-grid positions and two different resolutions. This paper presents a new demosaicing method that is especially designed for applications of dimensional measurement and compares its application to common demosaicing methods.

André Göpfert, Steffen Lerm, Maik Rosenberger, Matthias Rückwardt, Mathias Schellhorn
A NOVELL METHOD OF ELECTRONIC TECHNIQUES FOR SOLVING HIGH SPEED ILLUMINATION IN HIGH SPEED MEASURING SETUPS

With the demand in shorter process cycles in the production, the requirements for light pulses increase. This applies in particular to build stable and high intensity pulses with good reproducibility. With the help of the freezing the picture, the moving object can be almost independent of disturbances recorded. The aim of the project was a digitally controlled lighting control with regard to design specific criteria.
On the market available flash and lighting controls were investigate the suitability of a particular application. Given the low fitness, theoretical and practical methods were used for providing a regulated current source. On this basis, a circuit design and board layout prepared. The prototype was made in preview to the use of programming. The programming took initialization routines between several microcontrollers and electronic components. After programming, practical tests were carried out and the desired properties investigated. The tests were positive and a manifold useful.
The main focus of this paper will be in finding, simulate, practical tests and the results of control circuits for current control of LEDs.

Gorana Baršic, Biserka Runje, Sanjin Mahovic
ANALYSIS OF MEASUREMENT UNCERTAINTY IN THE PROCEDURE OF GROOVE DEPTH MEASUREMENT

This paper presents summary of influencing quantities in the procedure of measurement groove depth d by use of Epival-Interphako interferometric microscope. The expression of mathematical model describing the dependence of measured depth of groove d in relationship with all of the influencing components has been presented.
Influencing quantities have been analyzed, and the magnitudes of contribution of those quantities that are considered to have the largest influence on uncertainty of the result have been calculated.
This analysis has been done based on guidelines for calculation of measurement uncertainty: ISO Guide to the Expression of Uncertainty in Measurement (GUM) and Supplement 1 to the GUM – Propagation of distribution using a Monte Carlo method.

Fumihiro Sakuma, Laina Ma
UNCERTAINTY ESTIMATION OF SIZE-OF-SOURCE EFFECT MEASUREMENT FOR 650 NM RADIATION THERMOMETERS

This paper describes the uncertainty estimation of the size-of-source effect (SSE) measurement for the standard radiation thermometers in the indirect method using an integrating sphere with a black spot as the source. We checked the agreement between two processes of changing the black spot size and changing the aperture size. The SSE contributions of each uncertainty factors were analyzed.

Yoshitaka Morimoto
EVALUATION OF CUTTING DEVICE WITH STROKE ENLARGEMNET MECHANISM

A new cutting device driven by an enlargement mechanism with a PZT drive has been developed to realize positioning the cutting tool from nm to mm. In this study, the mechanical principal of a newly developed enlargement mechanism consisting of fluid chamber, a PZT device, and cutting tool stage is reported. The basic performances of the developed mechanism are also evaluated. This developed device demonstrates that the magnitude of enlargement reaches 4 times of stroke than the original one of the PZT. The dynamic characteristics show DC to 50 Hz which is enough frequency response to realize the non-circle cutting. The non-circle profile is machined by the developed mechanism. The profile accuracy obtained settles in ±1.3 µm by the repetitive control method.

Luís Borges, Norberto Barroca, Fernando Velez, António Lebres
WIRELESS FLEX SENSOR BELT NETWORKS FOR FOETAL MOVEMENT MONITORING IN LOW RISK PREGNANCIES

In this work two flex sensor belts were developed to count the foetal movements in the last four weeks of pregnancy. While one is a standalone solution the other is a wireless flex sensor belt network one. A description of the type of sensors is followed by the discussion of the different types of acquisition and data treatment methodologies. The application to display the deformation angles is presented as well. The wireless sensor network solution is based on the IEEE 802.15.4 standard, and the hierarchical wireless network solutions include a Wi-Fi layer. Preliminary results highlight the need for accounting for mother respiration movements and actual experiences with pregnant woman will facilitate tuning the threshold-trigger, to improve the detection performance.

Masato Watanabe, Yasuhiro Yamamoto, Kumiyo Nakakoji, Hiroyuki Kambara, Yasuharu Koike
ESTIMATION OF RELATIVELY COMMANDED FORCE FROM EMG AND ITS APPICATION TO HUMAN-MACHINE INTERFACES

In this paper we present a novel calibration method for an electromyogram (EMG) based human-machine interface which estimates force. EMG based interfaces need a calibration process in which musculoskeletal model parameters are determined for each individual user. Most conventional calibration methods which relate EMG signals to force magnitude require not only EMG measurement devices but also force sensors. Our goal here is to develop a calibration method that requires only EMG measurement devices. In our method, users are asked to apply stepwise force indicated by visual or auditory information. With a multiple linear regression model, the EMG magnitude is then related to that of the indicated force, instead of the force being measured by force sensors. With the users showing strong ability to exert linearly graded force, the force estimations of the linear regression model fit well with the indications, and estimated force correlated well with that of actual measured force.

Luciana Alves, Fabiana Reis, Miguel Torres, Giovanna Almeida, Iakyra Couceiro
SPATIAL UNIFORMITY OF THE SILICON PHOTODIODES FOR ESTABLISHMENT OF SPECTRAL RESPONSIVITY SCALE

The establishment of the absolute spectral responsivity scale traceable to the cryogenic radiometer depends on well-characterized optical detectors as radiometric scale transfer standards. The photodiodes used for the construction of such transfer standards need to be characterized in terms of spatial uniformity, spectral responsivity, shunt resistance and linearity. The spatial uniformity of a batch of Hamamatsu S1337-11 photodiodes was performed with a monochromatic beam in the spectral responsivity measurement facility with a X-Y translation stage. The spectral responsivity of such photodiodes had also been measured.

Page 762 of 977 Results 7611 - 7620 of 9762