Temat: time domain reflectometer - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: TDR technique for estimating the intensity of effective non rainfall
Autorzy:: Janik, G
Skierucha, W.
Blas, M.
Sobik, M.
Albert, M.
Dubicki, M.
Zawada, A.
Powiązania:: https://bibliotekanauki.pl/articles/26139.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: time domain reflectometry technique
time-domain reflectometer zob.TDR technique
intensity
non-rainfall water flux
water infiltration
soil
Opis:: The objective of this paper is to present a method for determining diurnal distribution of the intensity of effective non rainfall water flux. It was found that the application of TDR technique for the determination of diurnal dynamics of effective non rainfall water flux requires temperature correction of sensed volumetric moisture contents. Without temperature correction the error of estimated non rainfall water flux can be as much as 26%. In addition, the effect of temperature changes on the soil surface was determined in 0.5, 1, 2, 3, 4, and 5 hours periods. It was found that the intensity of effective non rainfall water flux was determined to the greatest extent by the rate of temperature drop during the period of 3 h preceding the non rainfall water flux determination. The agreement of non rainfall water flux calculated with the method proposed and that obtained by the collector was better for dew than for hoarfrost periods.
Źródło:: International Agrophysics; 2014, 28, 1
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Monitoring system of extreme loadings of propulsion system’s foundation : design assumptions
Autorzy:: Kyzioł, L.
Murawski, L.
Powiązania:: https://bibliotekanauki.pl/articles/242588.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine structural health monitoring
propulsion system diagnostic
marine engines’ foundations
underwater explosion
ship grounding
optical time-domain reflectometer
Fibre Bragg Grating
Opis:: Project of on-line diagnostic (monitoring) system of marine propulsion system working parameters is the authors' general target. Proper propulsion system’s foundation is one of the most important parameters for its reliable operation. Different types of quasi-static loadings and dynamic excitations can be observed during ships exploitation. Presented research has been limited to extreme loadings. Underwater explosions or ship groundings are considered examples of extreme foundation loadings. Analysis of the physical parameters of the extreme forces has been presented in the first part of the paper. Water pressure spatial and non-spatial (time) distribution during underwater explosion has been analysed as an example. Short overview of the dynamic mathematical models of underwater explosions is presented. Time function of vibrations acceleration of ship construction is important design assumption of planned Structural Health Monitoring (SHM) system. Propulsion system's foundation loading measurements should take into account general ship hull deformation (in the aft part of the ship) as well as reactions changes of main engine and shaft line bearings. Ship hull deformation should be monitored as quasi-continuous measurements, along whole propulsion system. Optical Time-Domain Reflectometer method (OTDR) is planned for hull deformation monitoring. Propulsion system bearings' reactions are a source of local foundation pads' strain changes. Fibre Bragg Grating (FBG) sensors are the best for that kind of measurements, in authors opinion. Both techniques (OTDR and FBG) have been shortly described in the paper. Scheme of monitoring system of marine propulsion systems foundation's loadings are proposed in the end of the article.
Źródło:: Journal of KONES; 2013, 20, 1; 155-162
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Miernik TDR wilgotnosci gleby z wykorzystaniem efektu studni impedancji
The TDR meter of moisture in soils with utilization of effect of the impedance well
Autorzy:: Kotlinski, J
Powiązania:: https://bibliotekanauki.pl/articles/1630403.pdf
Data publikacji:: 1999
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: gleby
wilgotnosc gleby
pomiary wilgotnosci
przyrzady pomiarowe
reflektometria czasowa
metoda TDR
aparat TDR
impedancja
soil
soil moisture
moisture measurement
measurement device
temporal reflectometry
time domain reflectometry technique
time domain reflectometer
impedance
Opis:: Odpowiednio zaprojektowana sonda aparatu TDR, przeznaczonego do pomiaru wilgotności w glebach, pozwala na otrzymanie reflektogramu charakterystycznego dla efektu studni impe dancji. Elementy wyróżnione takiego reflektogramu sugerują konstrukcję prostego detektora czasu propagacji impulsu testującego w obszarze czujnikowym sondy. Detektor umożliwia uzyskanie wyniku pomiaru w trybie natychmiastowym i bez obecności układu mikroprocesora. Modyfikacja linii transmisyjnej, polegająca na wprowadzeniu do niej dodatkowej nieciągłości impedancji, umożliwia zastosowanie omawianego detektora do przeprowadzenia procesu kalibracji przyrządu pomiarowego TDR,
Properly projected probe of the TDR apparatus, destined to measurement of moisture in soils, allows to receiving of reflectogram characteristic for effect of the impredance well. A characteristic features of the received reflectogram suggest a construction of the simple detector which estimate propagation time of the testing pulse in area of the probe. The detector makes possible to receive a result of measurement in instanta neous moge without a microporocessor. The modification of the tranmission line, relying on introducing of additional nonlinearly of impredance allows to apply of this same detector for calibration process of the TDR apparatus
Źródło:: Acta Agrophysica; 1999, 22; 73-82
1234-4125
Pojawia się w:: Acta Agrophysica
Dostawca treści:: Biblioteka Nauki

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