Abstract The condition of the consumables is a key factor determining waste reduction in welding processes and quality welded joint. paper presents results tests four types flux-cored wires dedicated for high-strength steels, stored 1 month 6 months Poland two urbanized areas: large seaside city (Gdańsk) Warsaw, located center country. were subjected to macroscopic microscopic (stereoscopic, SEM) observations, EDS analysis, technological assessing elastic properties targetability. degree...

Abstract The paper presents the family of three analyzers allowing to measure impedance in range 10 Ω<|Zx|<10 GΩ a wide frequency from mHz up 100 kHz. most important features analyzer are: miniaturization, low power consumption, production cost, telemetric controlling and use an measurement method based on digital signal processing (DSP). miniaturization other above-mentioned were obtained thanks newest generation large-scale integration chips: e.g. “system chip” microsystems (AD5933),...

A comprehensive description of impedance electrochemical systems has been presented, along with the assumptions method used. In this method, a multisinusoidal current excitation signal is The changes potential both electrodes and difference between these are all registered simultaneously as function time. proposed offers possibility separately determining instantaneous value each electrode well two-electrode system. short-time Fourier transform time registers allow determination in measured...

This paper presents a method of impedance spectroscopy designed for diagnostics anticorrosion coatings on objects directly in the field. To shorten time spectrum estimation (in range from 1 mHz to MHz) few minutes, harmonic signals were used determine above 10 Hz and square pulse low-frequency range. spectrum, digital signal processing algorithms adequate excitation used. In high-frequency range, discrete Fourier transform was used, but continuous transformation calculated eight segments...

The paper concerns the problem of evaluation stationarity carbon steel corrosion in 1M HCl. Comparison rate with addition inhibitor to reference measurement is the most often used way evaluating efficiency. Such an approach valid only if rate is a stationary process. Two complementary techniques were simultaneously: volumetric analysis of evolved hydrogen and instantaneous impedance spectroscopy monitoring. Changes electrode surface area chemical composition have major impact on dynamics...

This paper presents a method for the identification of impedance parameters objects, which can be modeled by two-terminal networks. The uses properties bilinear transformation, allows presentation object as function each parameter equivalent circuit object. Inverse transformation determination value on basis measurement at single frequency. frequency is selected identified element (on minimal relative sensitivity to changes other elements), so number frequencies equal elements identified....

Problems of Varistor Quality Assessment During Exploitation Varistors are commonly used elements which protect power supply networks against high-voltage surges or lightning. Therefore, quality and endurance these is important to avoid losses when an expensive laboratory equipment would not be protected from random overvoltages. Additionally, excessive leakage currents generate serious costs due high energy consumption. The paper presents shortly properties varistors that comprized different...

This paper presents a virtual instrument for measuring the impedance parameters of high objects (|Zx | ≤ 10 GΩ). A method component identification multi-element two-terminal networks has been developed on basis bilinear transformation. The is dedicated to parameter different kinds anticorrosion coatings. During identification, vector measurement object necessary at few selected frequencies, equal number elements under identification. analysis optimal frequencies selection presented ensuring...

Abstract In this paper the method of fast impedance spectroscopy technical objects with high (|Zx| ≥1 GΩ) is evaluated by means simulation and a practical experiment. The based on excitation an object sinc signal sampling response signals proportional to current flowing through voltage across measured impedance. object’s spectrum obtained use continuous Fourier transform basis linear approximations between samples in two acquisition sections, connected duration signal. first MATLAB...

A scent emitting multimodal computer interface is an important supplement of the polysensoric stimulation process. Such plays essential role in education and therapy children with developmental disorders (e.g. case autism or ADHD). The engineered may be a part equipment so-called world experience rooms but can also used separately, therefore enhancing substantially educational software. Emitting scents facilitate learning new material during science lessons and/or make them more attractive;...

The paper deals with wireless data transmission security in the distributed measurement and control system. An overview of cryptographic algorithms was presented paying special attention to algorithm dedicated units low processing power, which is important due minimization energy consumption. Measurement modules equipped simple microcontrollers send wirelessly central unit. secured using modified XXTEA assuring requirements for resource usage.

Abstract The paper presents an impedance measurement method using a particular sampling which is alternative to DFT calculation. uses sine excitation signal and response signals proportional current flowing through voltage across the measured impedance. object calculated without Fourier transform. was first evaluated in MATLAB by means of simulation. then practically verified constructed simple instrument based on PSoC (Programmable System Chip). obtained calculation simplification...

For many years, impedance spectroscopy is one of basic research methods for objects which can be modeled by a multi-element two-terminal network (e.g. in electrochemistry testing parameters anticorrosion coatings, biomedicine pathological changes on the basis skin, biological liquids). It consists measurement object Zm wide frequency range and an analysis obtained profile impedance. Using spectrum information about nature physico-chemical phenomena appearing under test, it possible to...

The paper presents a new measurement probe working as the input circuit for high impedance spectroscopy analyzer. allows to measure in range of 100Omega<|Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> |<100GOmega. extracts two signals proportional current through and voltage across measured wide frequency from 100muHz 1MHz. By use current-to-voltage converter influence capacitance shielded cables connecting object under on result is...

In this paper the method for fast impedance spectroscopy of technical objects with very high (|Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> | ≥ 1 GΩ) is evaluated by means simulation and practical experiment. The based on excitation an object, a square pulse measurements voltage current responses DAQ card. object spectrum obtained use continuous Fourier transform. Some improvements concerned sampling moments optimization are...