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    Wyświetlanie 1-15 z 15
    Tytuł:
    UV Radiation Detection Using Optical Sensor Based on Eu3+ Doped PMMA
    Autorzy:
    Miluski, P.
    Kochanowicz, M.
    Żmojda, J.
    Dorosz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/220742.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultraviolet radiation
    UV
    optical fibre sensor
    lanthanides
    Opis:
    Progress in UV treatment applications requires new compact and sensor constructions. In the paper a hybrid (organic-inorganic) rare-earth-based polymeric UV sensor construction is proposed. The efficient luminescence of poly(methyl) methacrylate (PMMA) matrix doped by europium was used for testing the optical sensor (optrode) construction. The europium complex assures effective luminescence in the visible range with well determined multi-peak spectrum emission enabling construction of the optrode. The fabricated UV optical fibre sensor was used for determination of Nd:YAG laser intensity measurements at the third harmonic (355 nm) in the radiation power range 5.0-34.0 mW. The multi-peak luminescence spectrum was used for optimization of the measurement formula. The composition of luminescent peak intensity enables to increase the slope of sensitivity up to -2.8 mW-1. The obtained results and advantages of the optical fibre construction enable to apply it in numerous UV detection systems.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 4; 615-621
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brillouin backscattering analysis in recent generation of telecom optical fibers
    Autorzy:
    Lakomski, Mateusz
    Tosik, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2172828.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Brillouin backscattering
    optical fibre
    optical fibre application
    optical fibre sensor
    strain measurement
    Opis:
    This paper reports on examination of the latest generation of telecom optical fibers for the Brillouin backscattering strain sensor application. Over 30 fibers from 5 different manufactures have been tested in terms of their ability to create a stable and accurate strain sensor. It has been proved that fibers that belong to the same standard, according to ITU-T (International Telecommunication Union), and even if provided by one manufacturer, demonstrate fundamentally different Brillouin backscattering response. It has been shown that unimodal Brillouin spectrum cannot be treated as the main parameter for fiber selection. In order to achieve accurate and reproducible results of strain measurement, it is necessary to perform initial examination of the fibers over the range of laser pulse width.
    Źródło:
    Optica Applicata; 2022, 52, 3; 405--416
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the air-fuel mixture ratio, based on the signal from the optical fibre interference sensor, using artificial neuron network
    Autorzy:
    Kamiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/244227.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    fibre optics sensor
    neuron networks
    Opis:
    There are a lot of definitions for the "intelligence", however according to the Prof. Jan Strelau the intelligence can only be attributed to a human. Thus, programs or devices thought out by a man can only imitate intelligence. The phras - artificial neuron networks describes programs or electronic devices running mathematical models of pseudo parallel data processing, consisting of many interconnected neurons imitating actions of biological structures of a brain. The neuron networks are used, amongst other things, for the sound and picture recognition, for the predicting, objects classification, data analysis, matching and optimisation. This work describes construction of an artificial neuron network in use. The design and operation principles of a fibre optics interference side - hole sensor are presented for the pressure measurement inside the engine combustion chamber and the data range used during a „teaching" process of an artificial neuron network. The gas pressure in the engine combustion chamber carries a lot of information which can be used to characterize the working cycle process. Knowing the pressure curve it is possible to estimate the air-fuel mixture ratio, detect lack of mixture ignition in the cylinder, explosive knocking combustion, unevenness of the following engine working cycles and even estimate the combustion chamber walls' temperature. Construction of a sensor ensures high pressure sensitivity with a low temperature sensitivity. The measuring head has been placed in the threaded opening made in the engine cylinder head. The paper presents results for two examples of the air-fuel mixture ratio estimations using already developed network. In the first example the measurement data, used during the network educating process, has deliberately been changed at random by 3%. In the second case, the original measurement data has been used. This allowed the initial assessment of the measurement noise influence on the mixture content estimation using fibre optics pressure sensor, in the combustion chamber, combined with the artificial neuron networks. The mixture content estimation results, together with the data obtained during measurements using wide range oxygen sensor, which are presented on the diagram, allowed the conclusions to be formulated.
    Źródło:
    Journal of KONES; 2008, 15, 2; 153-158
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An extrinsic Fabry–Pérot interference fiber sensor for ultrasonic detection of partial discharge
    Autorzy:
    Zhang, Ximin
    Qian, Sen
    Liu, Huixin
    Chen, Chuan
    Deng, Chuanlu
    Hu, Chengyong
    Huang, Yi
    Powiązania:
    https://bibliotekanauki.pl/articles/27310090.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    extrinsic Fabry-Pérot interference
    fibre sensor
    partial discharge
    sensitivity
    frequency
    Opis:
    An ultrasonic sensor based on extrinsic Fabry–Pérot interference (EFPI) has been designed and demonstrated to detect the ultrasonic wave signal. The sensitivity and natural frequency of fiber Fabry–Pérot (F-P) sensor with different structure parameter have been simulated by COMSOL. The simulation results illustrate that the sensitivity is up to 1.737 nm/kPa and the natural frequency is 2.1 MHz, when the silica diaphragm thickness is 2 μm, the radius is 90 μm, and the cavity length is 18 μm. The most suitable parameters have been selected and the F-P sensor has been fabricated. When the ultrasonic signals with the frequencies of 40 kHz and 1.2 MHz are respectively applied to the sensor, the frequencies detected by the EFPI ultrasonic sensor are 39 kHz and 1.21 MHz based on a partial discharge detection experiment for the designed demodulation system. The experimental results show that the sensor can accurately detect ultrasonic signals. As an excellent platform for ultrasonic signal sensing, this EFPI ultrasonic sensing system has great potential applications in partial discharge detection field.
    Źródło:
    Optica Applicata; 2023, 53, 2; 199--211
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fibre optic Bragg structures with monotonic apodisation characteristics
    Światłowodowe struktury Bragga o monotonicznej charakterystyce apodyzacji
    Autorzy:
    Klimek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2070254.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    apodised Bragg gratings
    optical fibre sensor
    FBG
    CFBG
    apodyzowane siatki Bragga
    czujniki światłowodowe
    Opis:
    The article discussesthe principle of operation and the structure of chirped and uniformgratings. It presents the method of producing gratings with monotonic apodisation characteristics, and compares the spectral features of produced gratings with the those obtained by mathematical modelling.
    W artykule omówiono zasadędziałania i budowę siatek chirpowych oraz siatek jednorodnych., przedstawiono sposób wytwarzania siateko monotonicznej charakterystyce apodyzacji, porównano charakterystyki spektralne siatek wytworzonych z charakterystykami uzyskanymi metodą modelowania matematycznego.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2021, 11, 4; 42--46
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of a simple refractive index sensor based on side-hole optical fibres
    Autorzy:
    Dudek, Michał
    Köllő, Kinga K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174855.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fibre optic sensor
    finite-difference time-domain
    numerical simulations
    refractive index
    side-hole optical fibre
    Opis:
    In this work the influence of the cavity parameters on optical losses of a simple intensitybased in-line refractive index sensor utilizing a micromachined side-hole fibre was studied by means of numerical simulations. To perform these simulations, the Authors used the finite-difference time-domain method. The proposed sensor setup consists of light source, micromachined optical fibre as a sensor head, and a detector which makes it low-cost and easy to build. The changes of the external refractive index can be, therefore, recovered by direct measurements of the transmitted intensity from which insertion loss values can be calculated. By changing geometry of the cavity micromachined into the side-hole optical fibre, it was possible to determine its influence on the final sensor sensitivity and measurements range. Based on the provided analysis of simulations results, a simple fibre optic sensor can be fabricated mainly for sensing external liquids refractive index for application in biochemistry or healthcare.
    Źródło:
    Opto-Electronics Review; 2022, 30, 4; art. no. e143607
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometric optimization of a beam detector for a WIM system
    Autorzy:
    Nieoczym, Aleksander
    Drozd, Kazimierz
    Wójcik, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/103148.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    FEM
    BEAM
    weigh-in-motion
    deflection of the beam
    fibre optic sensor
    MES
    ważenie w ruchu
    ugięcie belki
    czujnik światłowodowy
    Opis:
    Weigh-in-Motion (WIM) systems are designed for weighing vehicles driving across a measurement site. Because during measurements the vehicle has to come in physical contact with the components of the system, WIM systems always use built-in sensors installed in road pavement. Each WIM system consists of force sensors placed in one, two or even several lines, perpendicular to the direction of traffic. The idea behind WIM systems is to measure the dynamic loads that the wheels of a moving vehicle exert on the road surface and, on this basis, to estimate static wheel loads as well as gross vehicle weight.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 3; 233-241
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A weakly coupled multi-core fibre-based Michelson interferometer composed of an in-fibre coupler
    Autorzy:
    Mumtaz, Farhan
    Dai, Yutang
    Wenbin, Hu
    Abbas, Lashari Ghulam
    Parveen, Rashda
    Ashraf, Muhammad Aqueel
    Powiązania:
    https://bibliotekanauki.pl/articles/2063883.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    Michelson interferometer
    in-fibre coupler
    seven core fibre
    temperature sensor
    Opis:
    A compact temperature measuring device using a weakly coupled multi-core fibre in the Michelson interferometer structure is proposed and experimentally demonstrated. The device is manufactured by an easy and simple splicing approach which consists of a multi-core fibre segment and an in-fibre coupler. In-fibre coupler is made of a cascaded single-mode fibre and multi-core fibre balls. It enhances the interference phenomenon of light nergy between the central core and the outer cores of a multi-core fibre. The sensor shows a high quality fringe visibility of about 14–18 dB in the wavelength spectrum. Multi-core structure presents multi-path interferences and exhibits a maximum temperature sensitivity of 70.6 pm/°C in the range of 20–90°C with an insensitive response to the refractive index in the range of 1.334 to 1.354. The device has the advantages of compact size, easy manufacturing, and it solves cross-sensitivity between temperature and refractive index making it an authentic real-time temperature monitoring solution.
    Źródło:
    Opto-Electronics Review; 2021, 29, 4; 117--125
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vibration sensing with the optical fibre Mach-Zehnder interferometer
    Autorzy:
    Kurzych, Anna T.
    Jaroszewicz, Leszek R.
    Powiązania:
    https://bibliotekanauki.pl/articles/27315693.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    Mach-Zehnder interferometer
    vibration sensor
    optical fibre technology
    Opis:
    Vibration is a ubiquitous phenomenon that occurs in everyday life and people are exposed to it almost all the time. Most often, vibration is measured using electromechanical devices such as piezoelectric, piezoresistive, or capacitive accelerometers. However, attention should be paid to the limitations of such vibration sensors. They cannot operate in the presence of strong electromagnetic fields. Measurements with electromechanical devices require physical contact between the sensor and the vibrating object, which is not always possible due to the design of the sensor and device. The possibility of a non-contact vibration measurement in harsh environments is provided by the technology of interferometric fibre optic sensors. This paper reports the principle of operation, design aspects, experimentation, and performance of a Mach-Zehnder interferometric setup for the measurement of vibration frequency. There are different sensing arms implemented in the interferometer: single-mode, polarization-maintaining, and tapered optical fibre. The paper emphasises the simplicity of the set-up structure and the detection capabilities based on the interferometric sensing giving the possibility of constructing a commercial vibration sensor for all industry demands.
    Źródło:
    Opto-Electronics Review; 2023, 31, 4; art. no. e148992
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel fibre Bragg grating curvature sensor for structure deformation monitoring
    Autorzy:
    Liu, M.-Y.
    Zhou, S.-G.
    Song, H.
    Zhou, W.-J.
    Zhang, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/221816.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fibre Bragg grating
    curvature sensor
    large structure parts
    deformation monitoring
    Opis:
    Real-time monitoring of deformation of large structure parts is of great significance and the deformation of such structure parts is often accompanied with the change of curvature. The curvature can be obtained by measuring changes of strain, surface curve and modal displacement of the structure. However, many factors are faced with difficulty in measurement and low sensitivity at a small deformation level. In order to measure curvature in an effective way, a novel fibre Bragg grating (FBG) curvature sensor is proposed, which aims at removing the deficiencies of traditional methods in low precision and narrow adjusting. The sensor combines two FBGs with a specific structure of stainless steel elastomer. The elastomer can transfer the strain of the structure part to the FBG and then the FBG measures the strain to obtain the curvature. The performed simulation and experiment show that the sensor can effectively amplify the strain to the FBG through the unique structure of the elastomer, and the accuracy of the sensor used in the experiment is increased by 14% compared with that of the FBG used for direct measurement.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 3; 577-587
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of transmission properties of a tapered optical fibre with gold nanoparticles liquid crystal composite cladding
    Autorzy:
    Moś, Joanna E.
    Stasiewicz, Karol A.
    Jaroszewicz, Leszek R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174851.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    tapered optical fibre
    liquid crystals
    liquid crystal composites
    nanoparticles
    optical sensor
    Opis:
    The article presents a study of a hybrid structure based on the combination of a tapered optical fibre and gold nanoparticles dispersed in a liquid crystal material. Sensitivity to changes of the refractive index of the environment in which the structure is located, as well as the possibility of changing the refractive index of liquid crystals by external factors, such as temperature and electric field, were investigated. Electro- and thermally-induced changes of the refractive index of a liquid crystal through the rotation of a molecule director, which cause changes in the light propagated in a tapered optical fibre, were described. The most important issue in the article is to determine the influence of doping a liquid crystal with gold nanoparticles the concentration of which varies between 0.1 and 0.3 wt.%. The paper presents transmission measurements in a wide optical range depending on voltage, temperature, and frequency changes. Additionally, time courses of the obtained signal were measured. The study shows that the appropriate selection of nanoparticle concentration has a huge impact on the optical wave propagation. The experimental results show that the optical changes obtained for the investigated hybrid structure prefer it for use as an electrooptical switcher, filter, or sensor.
    Źródło:
    Opto-Electronics Review; 2022, 30, 4; art. no. e143936
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Air humidity-induced error in measuring resistance of a carbon fibre strain sensor
    Wpływ wilgotności powietrza na błąd pomiaru rezystancji sensora odkształceń wykonanego z włókien węglowych
    Autorzy:
    Górski, M.
    Krzywoń, R.
    Kekez, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/230778.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sensor tekstylny
    włókno węglowe
    kompensacja
    odkształcenie fałszywe
    monitorowanie konstrukcji
    textile sensor
    carbon fibre
    compensation
    strain error
    structural health monitoring
    Opis:
    The paper describes studies on the influence of humidity on the electrical resistance of a textile sensor made of carbon fibres. The concept of the sensor refers to externally bonded fibre reinforcement commonly used for strengthening of structures, however the zig-zag arrangement of carbon fibre tow allows for measuring its strain. The sensor tests showed its high sensitivity to the temperature and humidity changes which unfavourably affects the readings and their interpretation. The influence of these factors must be compensated. Due to the size of the sensor, there is not possible electrical compensation by the combining of “dummy” sensors into the half or full Wheatstone bridge circuit. Only mathematical compensation based on known humidity resistance functions is possible. The described research is the first step to develop such relations. The tests were carried out at temperatures of 10°C, 20°C, 30°C and humidity in the range of 30-90%.
    Kompensacja błędu pomiaru w tensometrii elektrooporowej ma istotne znaczenie dla dokładności mierzonych odkształceń. Wśród źródeł błędu zazwyczaj są zmiany temperatury, wilgotności, wahania stałej tensometru, przebieg ścieżki przewodzącej czy odkształcenia w kierunku prostopadłym. Już wstępne badania opracowanego przez autorów artykułu sensora odkształceń wykorzystującego włókna węglowe, jako przewodnik wykazały jego znaczną wrażliwość na zmiany wilgotności. Koncepcja sensora polega na wykorzystaniu laminatu zbrojonego włóknami węglowymi, tradycyjnie stosowanego do wzmacniania konstrukcji budowlanych, jako układu samo-monitorującego. Funkcja taka może być bardzo przydatna z uwagi na kruche właściwości tego typu materiałów i gwałtowny proces zniszczenia. Uzyskanie wystarczającej czułości wymaga wężykowatego ułożenia włókien węglowych, analogicznie do klasycznego tensometru elektrooporowego. Opisany w artykule sensor jest trzecią generacją rozwoju koncepcji, modyfikacja polega na zastąpieniu produkcji w procesie tkania przez stabilizację włókien na siatce kompozytowej. Zaletą tego rozwiązania jest ograniczenie niebezpieczeństwa przypadkowych zwarć w wyniku nieprawidłowej laminacji sensora.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 157-171
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, Sławomir
    Kurzych, Anna T.
    Dudek, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/1818211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, S.
    Kurzych, A. T.
    Dudek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818216.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, S.
    Kurzych, A. T.
    Dudek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818219.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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