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In this study, an experimental setup for a noncontacting high speed thickness measurement of planar objects is constructed. A simple calibration procedure is introduced and performance of the measurement setup is characterized. The setup includes two industrial cameras and two stripe lasers installed on opposite sides of the planar object. For a demonstration and characterization of the system, a...
A scattering measurement system to determine the optical characteristics of industrial suspensions in the wavelength range 430-700 nm was realized. The suspensions were mixtures of water and solid matter; the optical characteristics measured were the absorption coefficient, the scattering coefficient and the anisotropy. The measurement system comprised two integrating spheres of 203 mm diameter, a...
This paper provides details of the potential designs of a high-pressure high-temperature (HPHT) sensor which forms part of a highly accurate optical measurement system for permanent monitoring of pressure and temperature in oil wells. The proposed sensors are of a hybrid construction and comprise two different types of spectrally encoded transducers - a fiber Bragg grating (FBG) and a Fabry-Perot...
The characterization of hybrid aluminium / Carbon Fiber Reinforced Plastics (CFRP) sheets using multi-frequency eddy current sensors is presented in this paper. Both air-cored circular sensors and highly directional ferrite-cored sensors are designed for bulk conductivity measurements and directionality characterization. An analytical model describing the interaction of the circular sensors with the...
A particulates mass flow meter has been developed using a composite right/left-handed transmission line resonator. The presented sensor principle promises the possibility to design precise particulate solids mass flow meter with moderate costs. The Spatial Filter Velocimetry is applied to the sensor in order to detect the velocity information. The simultaneous detection of the velocity and the solids/air...
A real-time electronic nose system is designed to analyze methane (CH4), hydrogen (H2) and their mixtures, the main combustible gases in the environment. The system is based on a single chip for acquiring measurement data from a gas sensor array. Four Fe2O3 gas sensors with little humidity effect are employed in the gas sensor array. A principal component regression (PCR) method is applied to process...
During the last few decades a growing interest in monitoring and preserving strategic heritage and civil structures, has pushed the research towards the development of new devices and strategies for measuring the quantities of interest. The measuring strategies, based on innovative transducers, are required to avoid any significant influence on the monitored structure either in terms of functionality...
A new procedure to estimate the value of the individual components of a two-terminal impedance network is presented. It is based on the application of genetic algorithms to the spectral fitting of the impedances' model. The expanded uncertainty of the estimated parameters is obtained through simulations and the algorithm is also applied to the measured frequency response of two impedance networks...
Complex dielectric permittivity of dyed corn meal has been studied over a wide range of frequency, from 70 to 120 GHz. Transmittance and reflectance spectra have been recorded by using a free space quasi-optical millimeter-wave spectrometer, equipped with a high-power backward-wave oscillator as the source of tunable coherent radiation. The complex permittivity of dyed corn meal has been calculated...
Fuzzy inference systems are generally employed to deal with complex systems, when a high model uncertainty is present in processing signals and data related to those systems. In most presently available fuzzy inference systems, uncertainty is not assigned to input data, even when they come from an experimental, in-field process. Recent proposals showed that fuzzy and random-fuzzy variables can be...
In this paper, a frequency domain approach is proposed to measure the light flicker of the electricity transmission systems where the system frequency deviates significantly. Analytical expressions of the instantaneous light flicker sensation are obtained beginning from a voltage waveform and these expressions are used to obtain a flicker estimation method based on the IEC flickermeter. In the proposed...
In this work it is shown how simple modifications can be made to an arbitrary waveform generator to achieve orders of magnitude in memory compression for nonlinear modulation schemes.
MP3 is an important and popular audio compression standard. Watermarking directly in MP3 stream can result in better performance (robustness and fidelity) against MP3 compression. This paper presents an adaptive and secure watermarking algorithm for MP3 compressed audio signals, based on human auditory system. In the proposed algorithm, the watermark is embedded adaptively and inaudibly after the...
In order to establish the optimal receiver strategy, in terms of error rate for Single Input Multi Output (SIMO) wireless channels, the Maximum Likelihood (ML) detection should be performed following a multi-dimensional matched filter. However, the implementation of the matched filter and the ML detection both need the estimation of the channel impulse response in advance. In this work, we propose...
Jitter is one of the most important parameters for optical disc evaluation. In this paper, we describe the principle of optical disc data-to-data jitter and how to design a signal generator of optical disc data-to-data jitter. Then, a novel method is proposed to calibrate the data-to-data jitter based on Bessel-zero method. Finally, the evaluation of uncertainty in measurement for the calibration...
A determination of the reference impedance for the three standards line-attenuator-reflect (LAR) on-wafer vector network-analyzer (VNA) calibration is proposed. As a result, it is shown that the reference impedance to which the LAR calibration is referred cannot generally be determined. Based on this consideration, a modified LAR calibration allows a precise determination of the reference impedance...
Capacitive fluidic inclinometers provide an interesting alternative to pendulum based sensor principles for inclination measurement in harsh industrial environments, as mechanical problems due to the large pendulum are avoided. However, the performance of these sensors is strongly dictated by fluid properties. A common means to cope with the non ideal effects of the fluid in order to achieve high...
The paper proposes a calibration technique for the evaluation of the phase necessary for the operation of a 3-D scanner based on sinusoidal fringe projections. The calibration requires the acquisition of images of a target plane positioned at only two parallel poses and evaluates the phase values at intermediate positions through linear interpolation. The calibration procedure is described in detail...
In this paper preliminary results regarding a vibrating tactile sensor are presented. More specifically, two IPMC strips are used, one as actuator and one as sensor, that work together for the differentiation of tissues. In fact, the characteristics of the resonant vibrating IPMC system change with the applied load. This allows for calculating the parameters of the mechanical load, by measuring the...
On-line measurement of physical parameters of solution means a great deal in the osmotic dehydration process of food. Ternary solution with NaCl and sucrose is widely employed in this process. This study aims at reconstructing concentrations of two components and estimating density, viscosity of this ternary solution with multifunctional sensing technique in which the multifunctional sensor was previously...
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