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Tytuł:
Simultaneous measurement of refractive index and thickness for optically transparent object with a dual-wavelength quantitative technique
Autorzy:
Xu, X.
Wang, Y.
Xu, Y.
Jin, W.
Powiązania:
https://bibliotekanauki.pl/articles/174666.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital holography
phase measurement
cell measurement
red blood cell
Opis:
We present a new dual-wavelength quantitative measurement approach that can be employed for simultaneously measuring both the refractive index and the thickness of the homogenous specimen. This method is realized by dual-wavelength in-line phase-shifting digital holography, and then the phase images are obtained by using four-phase step algorithm for each wavelength separately. Based on computer simulation technology, the feasibility and the effectiveness of our proposed method are demonstrated by comparing our simulation results with the experimental results of the spherical silica bead and the red blood cell, respectively. Our work will provide some guidance in the experimental research for transparent phase objects.
Źródło:
Optica Applicata; 2016, 46, 4; 597-605
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings
Autorzy:
Sun, S.
Cao, Y.
Chen, C.
Fu, G.
Wang, Y.
Xu, X.
Powiązania:
https://bibliotekanauki.pl/articles/174300.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phase measurement
phase-shifting grating
distortion
image intensifier
imaging quality parameter
Opis:
A method for measuring the quality parameters of image intensifier based on projecting phase-shifting gratings is proposed. A set of designed phase-shifting gratings are projected into the measuring system orderly to obtain the magnification parameter of the measured image intensifier, and the phase caused by the measured image intensifier. After obtaining the referential phase caused by only the magnification of the measured image intensifier, the phase caused by the distortion of the measured image intensifier is extracted by phase calculating and phase unwrapping. Both the global distortion and the partial distortion of the measured image intensifier can be measured by phase-to-distortion matching at the same time. The experimental results show that the proposed method can measure the multiple quality parameters of image intensifier effectively.
Źródło:
Optica Applicata; 2018, 48, 1; 39-51
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for improving the precision of on-line phase measurement profilometry
Autorzy:
Mao, Z
Cao, Y
Zhong, L
Cao, S
Powiązania:
https://bibliotekanauki.pl/articles/174406.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
information optics
Stoilov's algorithm
phase measuring profilometry (PMP)
on-line phase measurement profilometry (OPMP)
phase-shifting
pixel matching
Opis:
An on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed to measure the 3D shape of moving object. While only one frame sinusoidal grating is projected on the moving object, the equal phase-shifting step deformed patterns modulated by profile of the measured object can be captured at every equivalent moving distance of the measured object instead of digital phase-shifting. Stoilov’s algorithm is an equal phase-shifting step algorithm at an arbitrary phase-shifting step, which is suitable for on-line phase measurement profilometry. However, the arbitrary phase-shifting step of Stoilov’s algorithm depends on the captured deformed patterns, in which the digitized errors of digital light projector or CCD camera, and the disturbance of surrounding light could be introduced, it will lead to some abnormities in wrapped phase, such as the denominator in Stoilov’s algorithm could be zero, which could cause the reconstructed 3D profile of the measured object appear burr, distortion or aberration, even could not be reconstructed. So an on-line phase measurement profilometry based on improved Stoilov’s algorithm is proposed. The arbitrary phase-shifting step is retrieved by both pixel matching and fringe cycle calibration rather than the captured deformed patterns. Experiments verify the feasibility and effectiveness of the proposed on-line phase measurement profilometry.
Źródło:
Optica Applicata; 2015, 45, 1; 51-61
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An automatic system for measurement of impedance active component using a quasi-balanced method
Autorzy:
Barwinek, S.
Cichy, A.
Powiązania:
https://bibliotekanauki.pl/articles/114468.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
virtual instruments
LabVIEW
capacitance measurement
impedance measurement
resistance measurement
phase shift measurement
Opis:
The paper presents the idea of the possibility of implementing automatic virtual instrument using the quasi ˗ balanced method to measure the active component of impedance (resistance). The system is based on the structure of a non-bridge quasi-balanced circuit. The process of balancing is automatically performed. This meter has been built based on the data acquisition board NI USB-6251 from National Instruments and programming environment LabVIEW. Signal processing is made in an algorithmic way. The measurement of the phase angle is based on short-term Fourier transform. The results of preliminary experimental research are presented in the paper.
Źródło:
Measurement Automation Monitoring; 2015, 61, 5; 132-135
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for improving sinusoidal quality of error diffusion binary encoded fringe used in phase measurement profilometry
Autorzy:
Tian, Z.
Chen, W.
Su, X.
Powiązania:
https://bibliotekanauki.pl/articles/174421.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phase measurement profilometry
digital-light-processing projector
DLP projector
error diffusion algorithm
binary encoded grating
Opis:
Insufficient resolution of digital-light-processing projector will degrade the sinusoidal quality of the binary encoded fringe pattern because of less sampling points in a fringe period, which will degrade the measurement accuracy if it is used in phase measurement profilometry. Two resolutions are proposed in the paper. One is that a cylindrical lens is introduced in the projecting light path of the measurement system to improve sinusoidal quality of the binary encoded fringe by elliptical low-pass filtering of the system. The other one is that superposition of multi-frame binary encoded gratings with different microstructure is to reduce the binary image noise for improving the measurement accuracy. Simulations and experiments verify the validity of the above two methods.
Źródło:
Optica Applicata; 2016, 46, 2; 291-303
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of optical to mography parameters for gas bubble shape analysis
Autorzy:
Rząsa, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/185491.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bubble shape
gas flow
optical
tomography
two-phase measurement
kształt bańki
przepływ gazu
tomografia
pomiar dwufazowy
Opis:
An optical tomograph in which a tested object is illuminated from five directions has been presented in the paper. The measurements of luminous intensity after changing into discrete signals (0 or 1) in the detectors equipped with 64 optical sensors were subjected to reconstruction by means of the matrix algorithm. Detailed description of the measuring sensor, as well as the principles of operation of the electronic system, has been given in the paper. Optical phenomena occurring at the phase boundary while transmitted through the sensor wall and phenomena inside the measuring space have also been taken into account. The method of the sensor calibration has been analysed and a way of technical solution of the problem under consideration has been discussed. The elaborated method has been tested using objects of the known shape and dimensions. It was found that reconstruction of the shapes of moving bubbles and determination of their main parameters is also possible with a reasonable accuracy.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 19-33
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZigBee phase shift measurement approach to mobile inspection robot indoor positioning techniques
Wykorzystanie pomiaru przesunięcia fazowego w transmisji ZigBee do pozycjonowania mobilnych robotów inspekcyjnych
Autorzy:
Śmieja, M.
Powiązania:
https://bibliotekanauki.pl/articles/327998.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
indoor positioning
phase shift measurement
ZigBee
pozycjonowanie w przestrzeniach zamkniętych
przesunięcie fazowe
Opis:
This paper presents the new approach to ZigBee ranging against the background of currently using techniques. This new approach involves a phase shift measurement instead of standard time of arrival or radio signal strength approaches. The ZigBee device used in this study and preliminary tests of ranging and positioning performed using phase shift measurements are presented. The positioning results encourages for further research on the performance verification and algorithms for processing of ranging results.
W artykule przedstawiono zmodyfikowane w stosunku do najczęściej obecnie stosowanych podejście do określania położenia obiektów wykorzystujące propagacje sygnały w protokole ZigBee. Typowe rozwiązania stosowane aktualnie w systemach lokalizacji opartych o bezprzewodowe sieci wymiany danych bazują na pomiarach czasu propagacji lub mocy sygnału. Opisane w artykule podejście odwołuje się do pomiaru przesunięcia fazowego sygnału wynikającego z wykorzystania do transmisji różnych częstotliwości. Przedstawione w artykule wstępne wyniki eksperymentów uzasadniają dalsze prace nad wykorzystaniem przedstawionej metody w zakresie opracowania algorytmów obliczeniowych pozycjonowania oraz weryfikacji efektów w warunkach rzeczywistych.
Źródło:
Diagnostyka; 2018, 19, 3; 101-107
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single parallel stubs as broadband microwave phase shifters
Autorzy:
Rutkowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/220484.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
phase shift
differential phase shift
microwave phase shifter
parallel stub
instantaneous frequency measurement
IFM
Opis:
Structures and characteristics of wideband small-size phase shifters made with the use of single parallel stubs are presented in this paper. The stubs can be short-circuited or open-circuited on termination. Such devices are well known, but are primarily used as components of filters or matching circuits. The novelty, then, comes from the establishment of simple, but helpful formulae, which enable to describe the insertion phase shift and differential phase shift of a line with short and open stubs connected in parallel. These equations can be very useful for designing complex microwave multi-ports. The results of simulations and measurements of the devices, which were designed and made, are shown herein. It was also proved that the presented device shave several usable operating frequency sub-bands, and that the differential phase shift values in the higher sub-bands are greater than those in the lower operating frequency ranges. Thanks to this, the described phase shifters can be used in more than one frequency sub-band. It was stated that in the conditions under analysis, larger phase shifts can be achieved using open-circuited stubs rather than short-circuited stubs. However, the phase shifters with shorted parallel stubs can operate in a wider frequency band.
Źródło:
Metrology and Measurement Systems; 2020, 27, 1; 91-102
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of a passive radar with quadrature microwave phase discriminators
Autorzy:
Rutkowski, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/221600.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
passive radar
instantaneous frequency measurement
IFM
microwave phase discriminator
phase of noise signal
Opis:
Passive radar does not have its own emitter. It uses so-called signals of opportunity emitted by non-cooperative illuminators. During the detection of reflected signals, a direct signal from a non-cooperative emitter is used as the reference signal. Detection of electromagnetic echoes is, in present day radars, performed by finding the maximum of the cross ambiguity function. This function is based on the multiplication of the received signal and the reference signal. Detection of echoes by means of a quadrature microwave phase discriminator QMPD was proposed in the work as an alternative solution for ambiguity function evaluation. This discriminator carries out vectorial summing of the received and the reference signals. The summing operations in QMPD are carried out with the aid of microwave elements and without the use of expensive digital signal processors. Definitions of the phase and phase difference of the so-called simple signals and noise signals were described. A proposal of a passive radar equipped with several independent quadrature microwave phase discriminators was presented. Ideas of algorithms of object detection and of the distance-to-object estimation designed for this radar have been also sketched.
Źródło:
Metrology and Measurement Systems; 2012, 19, 1; 95-104
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wideband Nine-Port Reflectometer
Autorzy:
Odrobina, S.
Staszek, K.
Wincza, K.
Gruszczynski, S.
Powiązania:
https://bibliotekanauki.pl/articles/227101.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiport measurement technique
reflectometer
reflection coefficient
measurement uncertainty
directional coupler
power divider
phase shifter
Opis:
The paper presents a wideband nine-port reflectometer realized as a cascade connection of six- and five-port reflectometers. It is shown that such a solution allows for a convenient adjustment of circuits’ parameters in order to provide significantly reduced measurement uncertainty with respect to other reported reflectometers. Simultaneously, the proposed network features a simple and flexible design. For the experimental verification, the proposed nine-port reflectometer has been manufactured and incorporated into the system intended for reflection coefficient measurements within the frequency range 2.5 - 3.5 GHz. The obtained results are in an excellent agreement with the values measured using a commercial VNA.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 19-25
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Introduction of three-dimensional measurement technologies developed and applied in suzuki motor corporation
Autorzy:
Yamage, Y.
Aoki, T.
Hashimoto, T.
Rövid, A.
Shibahara, T.
Akatsuka, S.
Suzuki, H.
Takeshi, M.
Ono, M.
Powiązania:
https://bibliotekanauki.pl/articles/385092.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
image measurement
3D measurement
Direct
Linear Transformation (DLT) methods
Phase-Only Correlation
(POC) function
Opis:
Suzuki Motor Corporation (SMC) recognizes the importance of collaborative projects with Universities and how it contributes to technological development effectively. In spite of the world economical depression, several projects could get started this year leaded by SMC. As a researcher of SMC, Author takes charge of two collaborative projects and introduces these as typical examples of the most successful collaborations. The first is, "3D Measurement System for Crash Tested Car" at Shizuoka University (Japan) and Budapest Tech Polytechnical Institute (Hungary) from 2008; the second is, "High-Accuracy Stereo Vision System Based on Phase-Only Correlation (POC) and Its Application to metal Component Inspection" with Tohoku Univ. (Japan) 2003-2005. By these collaborations, the profound knowledge of universities has a lot of possibility to suits the technical needs of SMC.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 220-223
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Extended Version of the Proportional Adaptive Algorithm Based on Kernel Methods for Channel Identification with Binary Measurements
Autorzy:
Fateh, Rachid
Darif, Anouar
Safi, Said
Powiązania:
https://bibliotekanauki.pl/articles/2142314.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
binary measurement
BRAN channel identification
kernel methods
PNLMS
phase estimation
Opis:
In recent years, kernel methods have provided an important alternative solution, as they offer a simple way of expanding linear algorithms to cover the non-linear mode as well. In this paper, we propose a novel recursive kernel approach allowing to identify the finite impulse response (FIR) in non-linear systems, with binary value output observations. This approach employs a kernel function to perform implicit data mapping. The transformation is performed by changing the basis of the data In a high-dimensional feature space in which the relations between the different variables become linearized. To assess the performance of the proposed approach, we have compared it with two other algorithms, such as proportionate normalized least-meansquare (PNLMS) and improved PNLMS (IPNLMS). For this purpose, we used three measurable frequency-selective fading radio channels, known as the broadband radio access Network (BRAN C, BRAN D, and BRAN E), which are standardized by the European Telecommunications Standards Institute (ETSI), and one theoretical frequency selective channel, known as the Macchi’s channel. Simulation results show that the proposed algorithm offers better results, even in high noise environments, and generates a lower mean square error (MSE) compared with PNLMS and IPNLMS.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 3; 47--58
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wind tunnel flux comparisons using a phase Doppler interferometer
Autorzy:
Roten, R.L.
Post, S.L.
Werner, A.
Safa, M.
Hewitt, A.J.
Powiązania:
https://bibliotekanauki.pl/articles/65512.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind tunnel
flux measurement
Doppler interferometer
phase Doppler system
droplet
Opis:
It is essential to know the movement of droplets in time and space (i.e. flux) when measuring and/or predicting spray drift in agricultural application. A study was performed to assess the flux measurements of a phase Doppler system against a standard monofilament system in a wind tunnel. The primary objectives of the study were to compare flux from a new phase Doppler system against 1.7 mm cotton and 2.0 mm nylon strings at varying wind speeds (1.4, 4.2, 8.3, 12.5, and 16.7 m ⋅ s–1) and spray exposures times (5, 10, 15, 30, and 60 s) with an overarching hypothesis that the active, phase Doppler is able to accurately measure the flux regardless of exposure and spray mass whereas the static string samplers are limited to a maximum retention. The phase Doppler did measure linearly as expected, however strings did not reach a point in which they loss mass; conversely, they appeared to overload with saturation. These findings are believed to be among many variables which influence the variability of previous mass balance studies.
Źródło:
Journal of Plant Protection Research; 2017, 57, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel ultrasonic distance measuring system based on correlation method
Autorzy:
Gądek, K.
Jaraczewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/141521.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic measurements
non-destructive testing
delay measurement algorithm
phase correlation
Opis:
This paper presents an innovative method for measuring the time delay of ultrasonic waves. Pulse methods used in the previous studies was characterized by latency. The method of phase correlation, presented in this article is free from this disadvantages. Due to the phase encoding with the use of Walsh functions the presented method allows to obtain better precision than previous methods. The algorithm to measure delay of the reflected wave with the use of microprocessor ARM Cortex M4 linked to a PC has been worked out and tested. This method uses the signal from the ultrasonic probe to precisely determine the time delay, caused by the propagation in medium, possible. In order to verify the effectiveness of the method a part of the measuring system was implemented in LabVIEW. The presented method proved to be effective, as it is shown in presented simulation results.
Źródło:
Archives of Electrical Engineering; 2014, 63, 3; 385-392
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Uncertainty of Phase Difference Determination in Presence of Bias
Autorzy:
Saranovac, L. V.
Vučijak, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/221324.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sinusoidal electrical signals
phase difference
bias
uncertainty of measurement
MSAL algorithm
Opis:
Determination of the phase difference between two sinusoidal signals with noise components using samples of these signals is of interest in many measurement systems. The samples of signals are processed by one of many algorithms, such as 7PSF, UQDE and MSAL, to determine the phase difference. The phase difference result must be accompanied with estimation of the measurement uncertainty. The following issues are covered in this paper: the MSAL algorithm background, the ways of treating the bias influence on the phase difference result, comparison of results obtained by applying MSAL and the other mentioned algorithms to the same real signal samples, and evaluation of the uncertainty of the phase difference.
Źródło:
Metrology and Measurement Systems; 2016, 23, 4; 603-614
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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