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Wyświetlanie 1-15 z 414
Tytuł:
Possibile Applications of Magnetic Microwires in Aviation
Autorzy:
Draganová, K.
Blažek, J.
Praslička, D.
Kmec, F.
Powiązania:
https://bibliotekanauki.pl/articles/97841.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
aviation
magnetic microwires sensors
magnetic field sensors
mechanical stress sensors
temperature sensors
Opis:
Magnetic microwires have been rediscovered due to a number of the unusual magnetic properties and their potential applications. The paper concerns glass-coated magnetic microwires composed of a ferromagnetic metallic core with a diameter of 0.6 – 30 μm and of a glass coat with a thickness of 2 – 20 μm. The fabrication process and magnetic properties of these microwires are described. Due to their unique properties microwires can be used as a sensing element of sensors. Microwire-based sensors can be used in a wide range of aviation applications as magnetic field sensors, tensile stress sensors or temperature sensors. The main advantages of microwire-based sensors are associated with their small dimensions and weight, which play a very important role in aviation.
Źródło:
Fatigue of Aircraft Structures; 2013, 5; 12-17
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres
Autorzy:
Pustelny, T.
Drewniak, S.
Setkiewicz, M.
Maciak, E.
Urbańczyk, M.
Procek, M.
Gut, K.
Opilski, Z.
Jagiello, J.
Lipinska, L.
Powiązania:
https://bibliotekanauki.pl/articles/200229.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
graphene
graphene oxide
gas sensors
resistive sensors
Opis:
The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synthetic air. Measurements were performed with a special emphasis on the detection of low concentrations of the analyzed gases. The reactions of the sensing structure to the effect of nitrogen and synthetic air at different humidity were also tested. Much attention was also paid to the fast response of the sensor to the changes in the gas atmosphere. The thin palladium layer (~2 nm) has been applied in order to improve the sensing properties of the structure. The investigations were performed in the temperature range from RT to 120°C and the analyzed gases in synthetic air were batched alternately with pure synthetic air.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 705-710
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase coding of information in the optical fibre sensor
Autorzy:
Życzkowski, M.
Karol, M.
Pałka, N.
Powiązania:
https://bibliotekanauki.pl/articles/1818224.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
optical fibre sensors
Mach-Zehnder interferometer
quantum sensors
Opis:
Determining the dependence of phase difference modulations between light pulses in a modified Mach-Zehnder interferometer was used to develop an optical system coding the information and working as an eavesdropping sensor for an optical fibre information exchange system. The basic challenge in the system development is to maintain stable operation in changing environmental conditions, as well as to ensure optimal parameters of the phase modulator. The system was tested for various many-kilometer long transmission lines of single-mode fibres. The research was focused on achieving the normative Bit Error Rate for the system in the 100 Mbit/s range (STM-1). Such a system can be used in commercial applications for the code key secure transmission in the physical layer of the link.
Źródło:
Opto-Electronics Review; 2020, 28, 1; 1--7
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical fibre current sensor for electrical power engineering
Autorzy:
Barczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/200123.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetooptic effect
optical fiber current sensors
polarimetric sensors
Opis:
The paper presents the experimental results of the investigations of optical fibre current sensors with an external transformation. The head of the sensor is made of the glass which has a high value of the Verdet constant. The sensor was built on the glass bar (with high value of the Verdet coefficient), polarisers, plastic optical fibres, a light source and a detector module. The paper deals with magnetic field measurements of two types of electrical current conductors: a typical conductor with circular cross-section and a busduct. Output signals from the optical current sensor were displayed on the digital oscilloscope and memorized in ěComp for a further analysis. This type of sensor was investigated on a laboratory stand and on an electrical power line which included conductor where the high intensity electric current flow. The constructed optoelectronic current sensor was tested for detection of current with intensity of the order of 200 A, with an accuracy of a few percent. Practically, the upper border of the current detection by means of this sensor is much higher.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 409-414
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dwustanowe czujniki temperatury z przełącznikami światłowodowymi
Binary temperature sensors with optical fiber switches
Autorzy:
Szczot, F.
Jasny, P.
Powiązania:
https://bibliotekanauki.pl/articles/155652.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
czujniki światłowodowe
czujniki dwustanowe
pomiary temperatury
optical fiber sensors
binary sensors
temperature sensors
Opis:
W referacie przedstawiono dwustanowe czujniki temperatury bazujące na przełącznikach optycznych (światłowodowych) pracujących jako pojedyncze układy pomiarowe lub stanowiące elementy całkowicie optycznych magistrali kontrolno-monitorujących. Sprecyzowano warunki pracy przełącznika światłowodowego (optycznego) dla wersji "ON"-"OFF" i możliwości sprzęgania go z tradycyjnym czujnikiem temperatury (dwustanowym elementem pomiarowym). Podano przykłady czujników temperatury w oparciu o mechaniczne przełączniki temperatury ("migowe" czujniki bimetalowe) oraz wytyczne i wstępne wymagania dla konstrukcji tak utworzonych czujników dwustanowych (hybrydowych) z wyjściowym sygnałem optycznym.
Single fiber optic sensors use various forms of interaction of a measured variable with optical beam guided by fiber optic cable: attenuation, polarization, interference etc.; usually demanding expensive information processing unit. Therefore there is a tendency to group single sensors into simplified networks with distributed binary sensors, even if it occurs at the cost of limited accuracy. This paper presents binary temperature sensors based on optical (optical fiber) switches working either as single measurement system or as a part of entirely optical measuring-controlling buses. We specify operating conditions for optical fiber switch in "ON" and "OFF" versions and possibilities of connecting it with conventional temperature sensor (two-state measuring element). Moreover we present some examples of temperature sensors based on mechanical switches (bimetallic sensors) and present guidelines and conditions for construction of this kind of sensors with optical output signal. Some constructional solutions of sensors with optical switches may offer innovative approach to implementation of logical sensors' network optical output. They may be implemented as a detection systems for over threshold signaling especially in difficult and dangerous environment. Summarizing they allow the connection of extended measuring and controlling networks which provide information about state and conditions of devices and their work conditions.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 6, 6; 522-524
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Types of Sensors used in Remote Sensing
Autorzy:
Vincent, Shweta
Francis, Sharmila Anand John
Raimond, Kumudha
Kumar, Om Prakash
Powiązania:
https://bibliotekanauki.pl/articles/227262.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
disaster management
microwave sensors
optical sensors
Remote Sensing
Opis:
Of late, the science of Remote Sensing has been gaining a lot of interest and attention due to its wide variety of applications. Remotely sensed data can be used in various fields such as medicine, agriculture, engineering, weather forecasting, military tactics, disaster management etc. only to name a few. This article presents a study of the two categories of sensors namely optical and microwave which are used for remotely sensing the occurrence of disasters such as earthquakes, floods, landslides, avalanches, tropical cyclones and suspicious movements. The remotely sensed data acquired either through satellites or through ground based-synthetic aperture radar systems could be used to avert or mitigate a disaster or to perform a post-disaster analysis.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 2; 217-228
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explosives vapors–concentrating and optoelectronic detection
Autorzy:
Wojtas, J.
Rutecka, B.
Popiel, S.
Nawała, J.
Wesołowski, M.
Mikołajczyk, J.
Cudziło, S.
Bielecki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/221395.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosives concentrator
explosive detection
optoelectronic sensors
CEAS sensors
Opis:
Detection of explosives vapors is an extremely difficult task. The sensitivity of currently constructed detectors is often insufficient. The paper presents a description of an explosive vapors concentrator that improves the detection limit of some explosives detectors. These detector s have been developed at the Institute of Optoelectronics. The concentrator is especially dedicated to operate with nitrogen oxide detectors. Preliminary measurements show that using the concentrator, the recorded amount of nitrogen dioxide released from a 0.5 ng sample of TNT increases by a factor of approx. 20. In the concentrator an induction heater is applied. Thanks to this and because of the miniaturization of the container with an adsorbing material (approx. 1 cm3), an extremely high rate of tempera ture growth is achieved (up to 500°C within approx. 25 s). The concentration process is controlled by a microcontroller. Compact construction and battery power supply provide a possibility of using the concentrator as a portable device.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 177-190
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Humidity Characteristics of Polymer-Based Capacitive Humidity Sensors
Autorzy:
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/221201.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polymer-based capacitive humidity sensors
low humidity measurement
humidity sensors modelling
Opis:
Polymer-based capacitive humidity sensors emerged around 40 years ago; nevertheless, they currently constitute large part of sensors’ market within a range of medium (climatic and industrial) humidity 20-80%RH due to their linearity, stability and cost-effectiveness. However, for low humidity values (0-20%RH) that type of sensor exhibits increasingly nonlinear characteristics with decreasing of humidity values. This paper presents the results of some experimental trials of CMOS polymer-based capacitive humidity sensors, as well as of modelling the behaviour of that type of sensor. A logarithmic functional relationship between the relative humidity and the change of sensor output value at low humidity is suggested.
Źródło:
Metrology and Measurement Systems; 2017, 24, 4; 607-616
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effects of humidity on the stability of LTCC pressure sensors
Autorzy:
Santo Zarnik, M.
Belavic, D.
Powiązania:
https://bibliotekanauki.pl/articles/221696.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thick-film piezoresistive sensors
capacitive pressure sensors
offset stability
relative humidity
Opis:
LTCC-based pressure sensors are promising candidates for wet-wet applications in which the effect of the surrounding media on the sensor's characteristics is of key importance. The effect of humidity on the sensor's stability can be a problem, particularly in the case of capacitive sensors. A differential mode of operation can be a good solution, but manufacturing the appropriate sensing capacitors remains a major challenge. In the case of piezoresistive sensors the influence of humidity is less critical, but it still should be considered as an important parameter when designing sensors for low-pressure ranges. In this paper we discuss the stability of the sensors' offset characteristics, which was inspected closely using experimental and numerical analyses.
Źródło:
Metrology and Measurement Systems; 2012, 19, 1; 133-140
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor Network Deployment Optimization for Improved Area Coverage Using a Genetic Algorithm
Autorzy:
Szklarski, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1861643.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
network of sensors
genetic algorithm
sensors deployment
area coverage
Opis:
Ensuring optimal coverage is a central objective of every sensor deployment plan. Effective monitoring of the environment helps to minimize manpower and time, while enhancing surveillance capability. In this paper, a solution for improved area coverage was presented. A lattice of a pre-defined parameter has been used as an input for the algorithm. For the purpose of the research the blanket deployment strategy has been adopted. Then, a genetic algorithm has been proposed and implemented to find an optimal solution. The proposed approach has been tested and the conclusions have been drawn. The results proved that the proposed genetic algorithm could already provide satisfactory results, usually finding only suboptimal solutions.
Źródło:
Security Dimensions; 2016, 19(19); 150-181
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wireless Sensor Based Health Monitoring System for Co-Morbid Patient
Autorzy:
Priyanka, D.
Saranya, A.
Priyanka, S. Selva
Vinothini, S.
Janani, M.
Sangeetha, S.
Powiązania:
https://bibliotekanauki.pl/articles/1193540.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Buzzer
LCD
Sensors
ZigBee
Opis:
Patients are suffering from physical and mental activities called co-morbidities. We have to give treatments for co-morbid patients while in home or in hospital. The patient should be monitored by caregivers. Caregivers can’t predict the accurate timing and the exact change of the optimal result of the patient. In this case, we have to use sensor to monitor the patient activities without manual support. By using eye blink sensor, motion sensor and temperature sensor to check the level of patient and it will be displayed in LCD. If some abnormalities occur, we have to give alarm by using buzzer to caregiver, doctor or family members. We have to use ZigBee, for storing the patient details in the hospital management. It is useful to check the patient report with secure level in the database.
Źródło:
World Scientific News; 2016, 41; 22-26
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel position estimators for timing belt drivers
Autorzy:
Kilic, E.
Dolen, M.
Koku, B.
Dogruer, C.
Powiązania:
https://bibliotekanauki.pl/articles/384439.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
sensors
actuators
safety
Opis:
This paper focuses on viable position estimation schemes for timing belt drives where the position of the carriage (load) is to be calculated via reference models accepting input from a position sensor on the actuator of the timing belt. A detailied analysis on the source of transmission errors is presented a number of relevant mathematical modeis are developed utilizing a priori knowledge on the process. The paper illustrates that such schemes are very effective when the drive system is not subjected to external loads es well as widely changing operating conditions such as ambient temperature, belt tension.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 2; 55-61
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of low-cost magnetic field and acceleration sensors in diagnostics of large-size structures
Zastosowanie niskobudżetowych czujników pola magnetycznego i przyspieszeń w diagnostyce konstrukcji wielkogabarytowych
Autorzy:
Szulim, P.
Mączak, J.
Rokicki, K.
Lubikowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/327370.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
diagnosis
magnetic sensors
MEMS sensors
diagnostic systems
diagnostyka
czujnik magnetyczny
czujnik MEMS
Opis:
The paper presents the possibilities of using low-cost magnetic and acceleration sensors in diagnostic systems of large-scale structures made of ferromagnetic materials. It covers typical problems associated with their use as well as the review of commercially available low-cost solutions. A specially designed magnetic sensor equipped with a CAN interface, which allows for connecting a number of transmitters into a measuring network, were tested during the experiment.
W pracy przedstawiono możliwość wykorzystania niskobudżetowych czujników pola magnetycznego i przyspieszeń w systemach diagnostyki konstrukcji wielkogabarytowych wykonanych z materiałów ferromagnetycznych. Przedstawiono typowe problemy występujące podczas ich użycia oraz dokonano przeglądu dostępnych na rynku tanich rozwiązań. W przeprowadzonym eksperymencie przetestowano specjalnie opracowane przetworniki pala magnetycznego wyposażone w interfejs CAN pozwalający nasączenie sieć pomiarową.
Źródło:
Diagnostyka; 2013, 14, 4; 43-49
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescencyjne sensory tlenu, ciśnienia i temperatury
Oxygen, pressure and temperature luminescent sensors
Autorzy:
Tsvirko, M.
Kalota, B.
Powiązania:
https://bibliotekanauki.pl/articles/171947.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
luminescencja
metaloporfiryny
kompleksy europu
sensory tlenu
sensory ciśnienia
sensory temperatury
luminescence
metalloporphyrins
europium complexes
oxygen sensors
pressure sensors
temperature sensors
Opis:
Optical chemical sensors enlarge the definition of a classical chemical sensor; they present results in two-dimensional (2D) or three-dimensional (3D) aspect. They can determine parameters of micro and macro scale objects without using a lot of electronic equipment. This article is focused on sensors based on porphyrin derivatives and europium complexes, being the most frequently used substances sensitive to oxygen concentration, pressure and temperature changes. Along with the presentation of characteristics of substances employed to sensors’ construction, also the general principle of luminescent sensors operation, composition and operation range of selected mono- and bifunctional luminescent sensors are described; moreover the selected achievements, such as the “traffic light” sensor are shown.
Źródło:
Wiadomości Chemiczne; 2011, 65, 11-12; 1069-1097
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixtures of selected n-alkanes and Au nanoparticels for optical fiber threshold temperature transducers
Autorzy:
Przybysz, N.
Marć, Paweł
Tomaszewska, E.
Grobelny, Jarosław
Jaroszewicz, Leszek R.
Powiązania:
https://bibliotekanauki.pl/articles/1818228.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
optical fiber sensors
temperature treshold sensors
gold nanoparticles
n-alkanes
photonic crystal transducers
Opis:
Thermo-optic properties enhancement of the bi-stable temperature threshold sensors based on a partially filled photonic crystal fiber was reported. Previously tested transducers filled with a selected group of pure n-alkanes had in most cases differences between switching ON and OFF states. Therefore, the modification of filling material by using additional crystallization centers in the form of gold nanoparticles was applied to minimize this undesirable effect. The evaluation of the thermodynamic properties of pentadecane and its mixtures with 14 nm spherical Au nanoparticles based on the differential scanning calorimetry measurements was presented. Optical properties analysis of sensors prepared with these mixtures has shown that they are bounded with refractive index changes of the filling material. Particular sensor switches ON before melting process begins and switches OFF before crystallization starts. Admixing next group of n-alkanes with these nanoparticles allows to design six sensors transducers which change ON and OFF states at the same temperature. Thus, the transducers with a wider temperature range for fiber-optic multi-threshold temperature sensor tests will be used.
Źródło:
Opto-Electronics Review; 2020, 28, 4; 220--228
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 414

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