M&MS - volume XVIII - number 1/2011

POLISH ACADEMY OF SCIENCES

Division IV: Engineering Sciences

Committee on Metrology
and Scientific Instrumentation

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VOLUME XVIII - NUMBER 1/2011

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CONTENTS

1. Correa Algeria, F., Tiglao, N.M.C. - On the bias of terminal based gain and offset estimation using the ADC histogram test method	3
2. Yin, L., Lin, P., Zhao, J.J., Qi, X. - Analysis of the factors affecting the realization of lambda transition temperature of ⁴He	13
3. Adamczak, S., Makieła, W. - Analyzing the variations in roundness profile parameters during the wavelet decomposition process using the MATLAB environment	25
4. Adamczak, S., J anusiewicz, A., Makieła, W., Stępień, K. - Statistical validation of the method for measuring radius variations of components on the machine tool	35
5. Mariscotti, A. - Measuring the stray capacitance of solenoids with a transmitting and a receiving coil	47
6. Svatoš, J ., Vedral, J., Fexa, P. - Metal detector excited by frequency-swept signal	57
7. Marszałek, Z., Sroka, R., Stencel, M. - A new method of inductive sensors impedance measurement applied to the identification of vehicle parameters	69
8. Falkowski, P., Mechler, A. - Dynamically programmable analog arrays in acoustic frequency range signal processing	77
9. Mazur-Milecka, M., Nowakowski, A. - Comparison of tracking methods in respect of automation of an animal behavioral test	91
10. Twardowski, P. - Surface roughness analysis in milling tungsten carbide with CBN cutters	105
11. Pułka, A. - Two heuristic alghorithms for test point selection in analog circuit diagnoses	115
12. Sun, Z. - Design and performance of the converging-diverging vortex flowmeter	129
13. Kowalczyk, A., Szlachta, A. - Algorithmic method for phase angle shift of noisy voltages using conditional averaging of delayed signal's absolute value	137
14. Barański, P., Polańczyk, M. ,Strumiłło, P. - Fusion of data from inertial sensors, raster maps and GPS for estimation of pedestrian geographic location in urban terrain	145
15. Hüseyin Çaycı - A complex current ratio device for the calibration of current transformer test sets.	159

ABSTRACTS & FULL PAPERS

contents

ON THE BIAS OF TERMINAL BASED GAIN AND OFFSET ESTIMATION USING THE ADC HISTOGRAM TEST METHOD

F.Corrêa Alegria¹⁾, Nestor Michael C. Tiglao²⁾

1) Instituto Superior Técnico and Instituto de Telecomunicações, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal (falegria@lx.it.pt, +351218418376)
2) Instituto Superior Técnico, Lisbon, Portugal and EEEI, University of the Philippines (nestor.tiglao@inesc-id.pt)

Abstract
The Histogram Test method is a popular technique in analog-to-digital converter (ADC) testing. The presence of additive noise in the test setup or in the ADC itself can potentially affect the accuracy of the test results. In this study, we demonstrate that additive noise causes a bias in the terminal based estimation of the gain but not in the estimation of the offset. The estimation error is determined analytically as a function of the sinusoidal stimulus signal amplitude and the noise standard deviation. We derive an exact but computationally difficult expression as well as a simpler closed form approximation that provides an upper bound of the bias of the terminal based gain. The estimators are validated numerically using a Monte Carlo procedure with simulated and experimental data.

Keywords: analog to digital converter, histogram test method, estimator bias, terminal based, gain, offset.

Full paper (PDF, 824kB)

contents

ANALYSIS OF THE FACTORS AFFECTING THE REALIZATION OF LAMBDA TRANSITION TEMPERATURE OF ⁴HE

L. Yin¹⁾, P. Lin²⁾, J. J. Zhao¹⁾ and X. Qi¹⁾

1) School of Science, Beijing University of Chemical Technology, Beijing 100029, China (yinliang@mail.buct.edu.cn, zhaojingjing2345@126.com, qixin@mail.buct.edu.cn, +86 10 64433867)
2) Division of Thermometry and Materials Evaluation, National Institute of Metrology, Beijing 100013, China (linp@nim.ac.cn)

Abstract
Owing to the dramatic change in the thermal conductivity of ⁴He when its temperature crosses the transition of superfluid (HeI) and normalfluid (HeII), a sealed-cell with a capillary is used to realize the lambda transition temperature, T_λ. A small heat flow is controlled through the capillary of the sealed-cell so as to realize the coexistence of HeI and HeII and maintain the stay of HeI/HeII interface in the capillary. A stable and flat lambda transition temperature "plateau" is obtained. Because there is a depression effect of T_λ caused by the heat flow through the capillary, a series of heat flows and several temperature plateaus are made and an extrapolation is applied to determine T_λ with zero heat flow. A rhodium-iron resistance thermometer with series number A34 (RIRT A34) has been used in 24 T_λ -realization experiments to derive T_λ with a standard deviation of 0.022mK, which proves the stability and reproducibility of T_λ.

Keywords: ⁴He, lambda transition temperature, sealed-cell, realization

Full paper (PDF, 381kB)

contents

ANALYZING VARIATIONS IN ROUNDNESS PROFILE PARAMETERS DURING THE WAVELET DECOMPOSITION PROCESS USING THE MATLAB ENVIRONMENT

Stanisław Adamczak, Włodzimierz Makieła

Kielce University of Technology, Faculty of Mechatronics and Machinery Design, Chair of Mechanical Technology and Metrology, Al. 1000-lecia P. P. 7, 25-314 Kielce, Poland, (adamczak@tu.kielce.pl, wmakiela@tu.kielce.pl, +48 41 3424283)

Abstract
Signal analysis performed during surface texture measurement frequently involves applying the Fourier transform. The method is particularly useful for assessing roundness and cylindrical profiles. Since the wavelet transform is becoming a common tool for signal analysis in many metrological applications, it is vital to evaluate its suitability for surface texture profiles. The research presented in this paper focused on signal decomposition and reconstruction during roundness profile measurement and the effect of these processes on the changes in selected roundness profile parameters. The calculations were carried out on a sample of 100 roundness profiles for 12 different forms of mother wavelets using MATLAB. The use of Spearman's rank correlation coefficients allowed us to evaluate the relationship between the two chosen criteria for selecting the optimal mother wavelet.

Keywords: mother wavelet, Fourier transform, wavelet transform, surface texture, surface roundness, roundness profile parameters.

Full paper (PDF, 380kB)

contents

STATISTICAL VALIDATION OF THE METHOD FOR MEASURING RADIUS VARIATIONS OF COMPONENTS ON THE MACHINE TOOL

Stanisław Adamczak, Adam Janusiewicz, Włodzimierz Makieła, Krzysztof Stępień

Kielce University of Technology, Chair of Mechanical Technology and Metrology, Al. 1000-lecia P. P. 7, 25-314 Kielce, Poland, (adamczak@tu.kielce.pl, adamj@tu.kielce.pl, +48 41 3424477, wmakiela@tu.kielce.pl, kstepien@tu.kielce.pl)

Abstract
This paper deals with the experimental validation of the suitability of the method for measuring radial variations of components on the process tool. The tests were conducted using a computerized PSA6, which was compared to a Talyrond 73. The results of measurement of roundness deviations as well as roundness profiles were analyzed for a sample of 70 shafts. The roundness deviations were assessed by determining the experimental errors, while the profiles obtained with the tested device were compared to those registered by the reference device using three correlation coefficients.

Keywords: roundness, experimental method error, process tool.

Full paper (PDF, 484kB)

contents

MEASURING THE STRAY CAPACITANCE OF SOLENOIDS WITH A TRANSMITTING AND A RECEIVING COIL

A. Mariscotti

Università di Genova, DINAEL, Via all'Opera Pia, 11A - 16145 Genova, (andrea.mariscotti@ unige.it, +390103532169, +390103532700)

Abstract
Air core solenoids, possibly single layer and with significant spacing between turns, are often used to ensure low stray capacitance, as they are used as part of many sensors and instruments. The problem of the correct estimation of the stray capacitance is relevant both during design and to validate measurement results; the expected value is so low to be influenced by any stray capacitance of the external measurement instrument. A simplified method is proposed that does not perturb the stray capacitance of the solenoid under test; the method is based on resonance with an external capacitor and on the use of a linear regression technique.

Keywords: Capacitance measurement, Uncertainty, Stray capacitance, Linear regression, Resonance condition

Full paper (PDF, 174kB)

contents

METAL DETECTOR EXCITED BY FREQUENCY-SWEPT SIGNAL

Jakub Svatoš, Josef Vedral, Pavel Fexa

CTU in Prague, Faculty of Electrical Engineering, Department of Measurement, Technicka 2,166 27, Prague 6,Czech Republic (svatoja1@fel.cvut.cz, +420 224 352 201)

Abstract
This paper describes the theoretical background of electromagnetic induction from metal objects modelling. The response function of a specific case of object shape - a homogenous sphere from ferromagnetic and nonferromagnetic material is introduced. Experimental data measured by a metal detector excited with a linearly frequency-swept signal are presented. As a testing target various spheres from different materials and sizes were used. These results should lead to better identification of the buried object.

Keywords: Metal detection, Polyharmonic signals, Frequency Sweep, Modelling of electromagnetic induction, Analog signal processing

Full paper (PDF, 698kB)

contents

A NEW METHOD OF INDUCTIVE SENSOR IMPEDANCE MEASUREMENT APPLIED TO THE IDENTIFICATION OF VEHICLE PARAMETERS

Zbigniew Marszałek, Ryszard Sroka, Marek Stencel

AGH - University of Science and Technology, Department of Measurement and Instrumentation, Al. Mickiewicza 30, 30-059 Cracow, Poland (rysieks@agh.edu.pl, antic@agh.edu.pl, masten@agh.edu.pl, +48 12 617 39 72)

Abstract
Inductive loop sensors are widely used for detection of presence, measurement of parameters as well as classification of vehicles. Vehicle classification may be performed based on their magnetic profiles. The magnetic profile is a signal which is proportional to the resultant of an impedance change of the sensor, caused by the measured object (the changes are minor - of the order of 1%). Generator and bridge circuits are most commonly used as conditioning circuits for such sensors. As a result we can obtain one output signal proportional to total changes of sensor parameters (R and L). In this paper, a modified bridge circuit that allows independent measurement of the components (R and L) of the sensor's impedance, has been proposed. With that provided, it is possible to receive broader information on the object, which allows higher classification resolution. This paper provides the concept of a circuit, model testing results, processing algorithms used and the test results of a real circuit.

Keywords: inductive loop sensor, substitute parameters, magnetic profile, measurement of traffic parameters.

Full paper (PDF, 2670kB)

contents

DYNAMICALLY PROGRAMMABLE ANALOG ARRAYS IN ACOUSTIC FREQUENCY RANGE SIGNAL PROCESSING

Piotr Falkowski, Andrzej Malcher

Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, Institute of Electronics, Akademicka 16, 44-100 Gliwice (piotr.falkowski@polsl.pl, +48 32 237 2162, andrzej.malcher@polsl.pl)

Abstract
Field programmable analog arrays (FPAA), thanks to their flexibility and reconfigurability, give the designers quite new possibilities in analog circuit design. The number of both academic projects on FPAA and applications of commercially available programmable devices is still growing. This paper explores the properties and parameters of two most popular FPAA circuits: the AnadigmVortex AN221E04 and AnadigmApex AN231E04 from the Anadigm company. The research conducted by the authors led to the discovery of some undocumented features of these devices. Several applications for audio processing were built and tested. The results show that these circuits can be used in medium-demanding audio applications. Thanks to dynamic reconfigurability, they also allow to build an universal analog audio signal processor. These circuits can also act as a versatile platform for rapid prototyping and educational purposes.

Keywords: FPAA, audio processing, switched-capacitor, analog circuits design

Full paper (PDF, 487kB)

contents

COMPARISON OF TRACKING METHODS IN RESPECT OF AUTOMATION OF AN ANIMAL BEHAVIORAL TEST

Magdalena Mazur-Milecka, Antoni Nowakowski

Gdańsk University of Technology, Faculty of Electronics, Telecommunication and Informatics, Department of Biomedical Engineering, Narutowicza 11/12, 80-952 Gdańsk, Poland (magda@biomed.eti.pg.gda.pl, +48 58 348 62 94)

Abstract
Automation in experiments carried out on animals is getting more and more important in research. Computers take over laborious and time-consuming activities like recording and analysing images of the experiment scene. The first step in an image analysis is finding and distinguishing between the observed animals and then tracking all objects during the experiment. In this paper four tracking methods are presented. Quantitative and qualitative figures of merit are applied to confront those methods. The comparison takes into consideration the level of correct object recognition during different disturbances, the speed of computation, requirements as to the frame rate and image illumination, quality of recovering from occluded situations and others.

Keywords: analysis, object tracking, animal social interaction tests

Full paper (PDF, 280kB)

105

contents

SURFACE ROUGHNESS ANALYSIS IN MILLING OF TUNGSTEN CARBIDE WITH CBN CUTTERS

Paweł Twardowski

Poznan University of Technology, Faculty of Mechanical Engineering, ul. Piotrowo 3, 60-965 Poznan, Poland (pawel.twardowski@put.poznan.pl)

Abstract
In this paper, an experimental surface roughness analysis in milling of tungsten carbide using a monolithic torus cubic boron nitride (CBN) tool is presented. The tungsten carbide was received using direct laser deposition technology (DLD). The depth of cut (a_p), feed per tooth (f_z) and tool wear (VB_c) influence on surface roughness parameters (Ra, Rz) were investigated. The cutting forces and accelerations of vibrations were measured in order to estimate their quantitative influence on Ra and Rz parameters. The surface roughness analysis, from the point of view of milling dynamics was carried out. The dominative factor in the research was not feed per tooth f_z (according to a theoretical model) but dynamical phenomena and feed per revolution f connected with them.

Keywords: milling, tungsten carbide, CBN, surface roughness, dynamics.

Full paper (PDF, 1399kB)

115

contents

TWO HEURISTIC ALGORITHMS FOR TEST POINT SELECTION IN ANALOG CIRCUIT DIAGNOSES

Andrzej Pułka

Silesian University of Technology, Faculty of Automatic Control, Electronics and Computer Science, Institute of Electronics, Akademicka 16, 44-100 Gliwice, Poland (andrzej.pulka@polsl.pl, +48 32 237 1644)

Abstract
The paper presents a heuristic approach to the problem of analog circuit diagnosis. Different optimization techniques in the field of test point selection are discussed. Two new algorithms: SALTO and COSMO have been introduced. Both searching procedures have been implemented in a form of the expert system in PROLOG language. The proposed methodologies have been exemplified on benchmark circuits. The obtained results have been compared to the others achieved by different approaches in the field and the benefits of the proposed methodology have been emphasized. The inference engine of the heuristic algorithms has been presented and the expert system knowledge-base construction discussed.

Keywords: analog circuit diagnosis, fault diagnosis, testing, search methods, heuristic optimization.

Full paper (PDF, 255kB)

129

contents

DESIGN AND PERFORMANCE OF THE CONVERGING-DIVERGING VORTEX FLOWMETER

Zhiqiang Sun

School of Energy Science and Engineering, Central South University, Changsha 410083, China (zqsun@mail.csu.edu.cn)

Abstract
The converging-diverging structure is introduced to extend the lower limit of measurement of vortex flowmeters. As a compact device, the converging-diverging vortex flowmeter is proposed and designed, and its performance is studied experimentally. It is found that, first of all, an up to 51% extension of the lower measurement limit can be realized through the converging-diverging structure, compared with conventional vortex flowmeters; second, the converging-diverging vortex flowmeter with a trapezoidal bluff body has a larger Strouhal number and smaller pressure loss. The results suggest that the converging-diverging vortex flowmeter provides an alternative device especially suitable for the measurement of low-velocity fluids.

Keywords: vortex flowmeter, converging-diverging structure, lower limit of measurement, Strouhal number, drag coefficient.

Full paper (PDF, 138kB)

137

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ALGORITHMIC METHOD FOR PHASE ANGLE SHIFT OF NOISY VOLTAGES USING CONDITIONAL AVERAGING OF DELAYED SIGNAL'S ABSOLUTE VALUE

Adam Kowalczyk, Anna Szlachta

Rzeszow University of Technology, Department of Metrology and Diagnostic Systems, W. Pola 2B, 35-959 Rzeszow, Poland (kowadam@prz.edu.pl, annasz@prz.edu.pl)

Abstract
The method of a phase shift angle measurement using conditional averaging of delayed signal absolute value (CAAV) is presented in this paper. The input sinusoidal signal x(t) is without noise. White noise with normal distribution and band limited to low frequencies has been applied as disturbance of delayed sinusoidal signal z(t). Noise n(t) - N(0, σ_n) is added to the delayed signal - the noised and delayed signal z(t) is obtained. The phase angle shift is proportional to time location of CAAV's minimum (minimum of the characteristic of conditional averaging of delayed signal's absolute value). The phase angle shift can be determined on the basis of conditional averaging value of elaborated algorithm. The characteristics of conditional average of delayed signal's absolute value in the surrounding of the minimum of this function (the results of practical investigations and theoretical calculation) are presented. The experimental variance of characteristic CAAV in surroundings of the minimum (obtained from practical investigations and calculation) is illustrated in the paper. The algorithms of conditional averaging have been elaborated and practically realized in the LabVIEW environment.

Keywords: phase angle shift, additive disturbance, conditional signal averaging.

Full paper (PDF, 488kB)

145

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FUSION OF DATA FROM INERTIAL SENSORS, RASTER MAPS AND GPS FOR ESTIMATION OF PEDESTRIAN GEOGRAPHIC LOCATION IN URBAN TERRAIN

Przemyslaw Baranski, Maciej Polanczyk, Pawel Strumillo

Technical University of Lodz, Institute of Electronics, 211/215 Wolczanska, 90-924 Lodz, Poland (przemyslaw.baranski@p.lodz.pl, maciej.polanczyk@p.lodz.pl, pawel.strumillo@p.lodz.pl, +48 42 631 26 46)

Abstract
An electronic system and an algorithm for estimating pedestrian geographic location in urban terrain is reported in the paper. Different sources of kinematic and positioning data are acquired (i.e.: accelerometer, gyroscope, GPS receiver, raster maps of terrain) and jointly processed by a Monte-Carlo simulation algorithm based on the particle filtering scheme. These data are processed and fused to estimate the most probable geographical location of the user. A prototype system was designed, built and tested with a view to aiding blind pedestrians. It was shown in the conducted field trials that the method yields superior results to sole GPS readouts. Moreover, the estimated location of the user can be effectively sustained when GPS fixes are not available (e.g. tunnels).

Keywords: pedestrian navigation, data fusion, GPS, digital maps, particle filtering, electronic travel aids.

Full paper (PDF, 698kB)

159

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A COMPLEX CURRENT RATIO DEVICE FOR THE CALIBRATION OF CURRENT TRANSFORMER TEST SETS

Hüseyin Çaycı

National Metrology Institute of Turkey (TUBITAK UME), Power & Energy Laboratory, P.O. Box:54, Gebze, 41470 Kocaeli, Turkey, (huseyin.cayci@ume.tubitak.gov.tr, +90 262 679 5000)

Abstract
A practical method with high accuracy in generation and application of error values for calibration of current transformer test sets is described. A PC-controlled three-phase power source with a standard wattmeter is used for generating the nominal and error test currents while an electronically compensated current comparator is used to provide summation and subtraction of them, precisely. With this method, any ratio error and phase displacement values could be generated automatically and nominal and test currents could be grounded on the test set safely. Because of its high accurate ratio and phase error generating capability, any type of test set regardless of its operating principles could be calibrated.

Keywords: current transformer test set, ratio error, phase displacement, current comparator, compensation.

Full paper (PDF, 315kB)