ANTHONY D. MCGRATH, S. MORI VAEZI-NEJAD

Communications Technology Group
London Metropolitan University
North Campus, Holloway Road, London N7 8DB
e-mail: m.vaezinejad@londonmet.ac.uk

MEASUREMENT OF LUMINESCENCE IN COLOURED PRINTED MATERIALS

While fluorescent pigments have been used for many years, the formulation and quality control of coloured printed materials containing them, has been a challenge, primarily due to lack of appropriate instrumentation at a cost that is economically viable to make the necessary measurements. This paper deals with the economical instrumentation and measurement of fluorescent properties of coloured printed material under investigation. Significance of the correct method of excitation and detection are discussed. Characteristics of desirable commercially available light sources and detectors are also described. Application of one of such a detector for our investigation is considered in some detail.

Keywords: Colour detection, Fluorescent pigmentation, Printed materials, Spectrometer

Full paper (217kB): M&MS_2006_221.pdf

RUMEN ARNAUDOV, ROSSEN MILETIEV

Technical University of Sofia
Faculty of Communications, Bulgaria
e-mail: RA@tu-sofia.bg, miletiev@tu-sofia.bg

ANALYSIS OF THE IRREGULARLY SAMPLED SIGNALS ABOVE THE NYQUIST LIMIT

A new method of spectrum analysis of the nonuniformly sampled data above the Nyquist limit is proposed, which is based on the digital spectral shift to the baseband, optional filtering and the subsequent spectrum analysis below the Nyquist limit. The method is distinguished by low aliasing frequency estimation and sufficient computation effectiveness. The mathematical background is shown and simulation results are presented to illustrate the method basics.

Keywords: Nonuniformly sampled data, digital frequency shift

Full paper (149kB): M&MS_2006_231.pdf

JAROSŁAW ZYGARLICKI¹, JANUSZ MROCZKA<sup>2

1</sup>Technical University of Opole, Poland
e-mail: j.zygarlicki@weia.po.opole.pl
²Technical University of Wroclaw
Chair of Electronic & Photonic Metrology, Poland
e-mail: janusz.mroczka@pwr.wroc.pl

DATA COMPRESSION USING PRONY'S METHOD AND WAVELET TRANSFORM IN POWER QUALITY MONITORING SYSTEMS

The paper presents a new method for data compression that can be used in power quality monitoring systems. Described algorithm offers high compression ratio and keeps good accuracy of the reconstructed signals. The algorithm uses a modified Prony's method for initial power waveform modeling (basic parameters of estimation) as well as wavelet transform for additional reduction of compression artifacts present in the Prony model of the analysed signal. The combination of the Prony's method and wavelet transform enables obtaining effective compression of real signals observed in monitoring systems. It also gives information about harmonics and transient oscillatory components of power waveforms that can be used for the power quality analysis. Examples of real signals recorded in power monitoring systems are presented in the paper as well as discussion of compression efficiency for different sets of compression artefacts level.

Keywords: signal compression, Prony's method, wavelet transforms, power quality

Full paper (261kB): M&MS_2006_237.pdf

N. BALABANAVA¹, Z. RYMUZA¹, S.A. CHIZHIK<sup>2

1</sup>Warsaw University of Technology
Poland; e-mail: n.balabanava@mchtr.pw.edu.pl, z.rymuza@mchtr.pw.edu.pl
²National Academy of Science of Belarus
Institute of Heat and Mass Transfer
220000 Minsk, Belarus, e-mail: chizhik_sa@tut.by

ESTIMATION OF YOUNG'S MODULUS AND ADHESIVE FORCE OF POLYMERIC FILMS BY USE OF ATOMIC FORCE MICROSCOPE

Keywords: Atomic force microscope, Young's modulus, adhesive (pull-off) force, polymeric films, microhandling, microgripper

Full paper (359kB): M&MS_2006_253.pdf

MIROSŁAW KOZIOŁ

University of Zielona Góra
Institute of Electrical Metrology, Poland
e-mail: m.koziol@ime.uz.zgora.pl

FREQUENCY-RESPONSE COMPENSATION OF DISTORTING PARTS OF MEASUREMENT SYSTEMS

In this article a class of digital correction filters is presented. This class of filters has been synthesized in an optimization procedure where two criteria are considered. The first criterion is an approximation of the series interconnection of a distorting system and a compensating filter. The second is the stability of the compensating filter. Their characteristic advantage is full correction of phase distortions independent from the values of established criteria. These filters can be useful for compensation of parts of measurement systems when the discrete transfer function has the zeros on the unit circle or in its proximity. Theoretical results have been verified in numerical simulations.

Keywords: frequency-response compensation, inverse systems, regularization, noncausal systems

Full paper (493kB): M&MS_2006_263.pdf

ZBIGNIEW ŚWIERCZYŃSKI, TOMASZ GUSZKOWSKI

Wroclaw University of Technology
Faculty of Electronics, Poland
e-mail: zbigniew.swierczynski@pwr.wroc.pl

APPLICATION OF SOM IN CLASSIFICATION OF EGG SIGNALS

The report presents problems associated with computer aided gastric diagnosis. The subject of the study are electrogastrographic (EGG) signals (non-invasively measured electrical signals generated by the human stomach). The signals were digitally recorded and then parametrized, with linear autoregressive models (AR). The data and parametrization method used in the study were the same as used by the authors in the previous study; therefore here they are only shortly described. The sets of numbers, obtained by these means, were treated as information vectors, and classified with the Self Organizing Map (SOM) classifier. The structure and parameters of the algorithm used for classification of the parametrized EGG data are described. The final efficiency of the whole system (SOM classifier with the parametrization method applied), reaching 80%, is promising. It is similar to the results of other classifiers. The ways to improve the effectiveness are also outlined.

Keywords: EGG, electrogastrographic signals, gastric electrical activity, SOM, Self Organizing Map, parametrization, classification, stomach

Full paper (254kB): M&MS_2006_279.pdf

ADAM WOŹNIAK

Warsaw University of Technology
Institute of Metrology and Measuring Systems, Poland
e-mail: wozniaka@mchtr.pw.edu.pl

SIMPLE METHOD OF 3D ERROR COMPENSATION OF TRIGGERING PROBES ON COORDINATE MEASURING MACHINE

In this study an automatic, simple algorithm of systematic error corrections of a CMM touch triggering probe is proposed. The whole process does not exceed a standard calibration procedure done on coordinate machine before each measuring task. The tests show that the application of the proposed method will allow reducing fourfold the systematic errors of probe performance.

Keywords: coordinate measuring machine (CMM), triggering probe, error compensation

Full paper (407kB): M&MS_2006_289.pdf

JERZY AUGUSTYN

Kielce University of Technology
Department of Electrical and Computer Engineering, Poland
e-mail: etmja@tu.kielce.pl

UNCERTAINTY EVALUATION OF THE PROCESSING ALGORITHM OF A TIME-VARIABLE QUANTITIES IN MULTI-CHANNEL MEASUREMENT SYSTEMS

In this paper the application of the generalised law of uncertainty propagation in determining the standard uncertainty of measurement in a multi-channel sampling transducer has been proposed. It has been shown that for time-variable quantities one of the sources of processing uncertainty is the timing jitter between the successive samples and particular channels of the transducer. The influence of the uncertainty propagation related to the quantization and sampling of time variable signals by the processing algorithm has been analysed. The analysis results have been used for the uncertainty propagation evaluation in an impedance components measurement circuit.

Keywords: uncertainty evaluation, uncertainty propagation, sampling transducer, impedance measurement

Full paper (196kB): M&MS_2006_303.pdf

CONGRATULATORY LETTER
TO PROFESSOR ALBERT WECKENMANN, MEMBER OF THE PROGRAMME BOARD OF M&MS, ON THE OCCASION OF CONFERMENT OF THE HONORIS CAUSA DOCTOR'S DEGREE BY THE UNIVERSITY OF BIELSKO-BIAŁA

Warsaw, April 2006

Prof. Eugeniusz Ratajczyk
Chairman of The Committee on
Metrology and Research Equipment
Polish Academy of Sciences