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The following topics are dealt with: sensors; image processing; measurements; transducers; calibration; noninvasive measurements; inverse problems; telecommunications; measurement uncertainty; digital signal processing; automated test systems; diagnostics systems; sensor networks; analog signals; mixed signals; soft computing; analog conversion; digital conversion; mathematical modeling; and sensor...
This paper describes and compares two particle excitation methods, square and sine wave, used in conjunction with novel application of Phase Doppler Anemometry (PDA) to obtain particle size and charge simultaneously in real time. Different signal processing strategies for particle velocity and size estimation are investigated, including Quadrature Demodulation (QD), spectral analysis and correlation...
This paper presents the latest development in the velocity measurement of pulverized coal and biomass fuels in pneumatic pipelines using electrostatic sensors in combination with correlation signal processing techniques. A comparative study of electrostatic sensors with circular and rod electrodes was conducted on a 94mm bore horizontal pipeline feeding a 4 MW industrial scale furnace. Experimental...
This paper describes a new algorithm for parameter estimation of multichannel single-tone signals. The algorithm works in the frequency domain and uses a least square optimization to estimate the signals' amplitudes, phases and common frequency. The performance of the algorithm is shown on both simulated and measured signals.
A large number of foreign students come to Japanese universities recently, where Japanese reading and pronunciation are problems for the foreign students. In this study, we propose a new Japanese training system for foreign students. First, we analyze Japanese accents of foreign students. Second, we compare the accents of foreign students and the accents of Japanese standards. Finally, we develop...
Assessing the dynamic performance of digital-to-analog converters (DAC) is challenging due to the limited resolution of flash analog-to-digital converters (ADC) that are used for the scope. Current solutions are either difficult to be implemented in practice or suffer from serious limitations due to the uncertainty of the hardware utilized. The paper present an innovative method for testing the dynamic...
The research concerns with the evaluation of the dynamic performances of the DAC by analysing, in the frequency domain, the estimated output signal characterised by non uniform sampling. The non uniform sampling is caused by the method used to acquire the signal with both high resolution and linearity. On the basis of this characteristic, the signal processing in the frequency domain by tradition...
The paper presents the approach to the design of the virtual instruments performing parallel computations for signal processing. Based on the example of the virtual instrument performing both frequency and time measurements, the method of creating the measurement software working under the real-time operating system is explained. Comparison between the designed instrument and its non-parallel counterpart...
Thermocouple is a very popular and effective sensor for temperature measurement. But how to eliminate the interference of the temperature of cold junction is always a problem. A method based on recursive B-spline least-squares is proposed as a solution. The method establishes two models to convert the cold junction temperature to electromotive force (EMF) and the hot junction EMF to temperature respectively...
Methods in vogue for the measurement of venous refilling time (VRT), based on the photo-plethysmographic (PPG) principle, employ a feedback compensation technique to remove the influence of the colour of a patient's skin. Hence these methods require a ldquostandardization phaserdquo for every measurement. Based on an appropriate model for the propagation of light through skin and tissue, a novel signal...
The paper presents a method of impedance spectroscopy designed for a diagnostics of anticorrosion coatings on objects directly in the field. To shorten the time of impedance spectrum estimation (in the range from 1 mHz to 1 MHz) down to a few minutes, harmonic signals were used to determine the spectrum above 100 Hz and a square pulse in the low frequency range. To determine the impedance spectrum...
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