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    Wyświetlanie 1-9 z 9
    Tytuł:
    Modeling of HgCdTeLWIR detector for high operation temperature conditions
    Autorzy:
    Martyniuk, P.
    Gawron, W.
    Madejczyk, P.
    Rogalski, A.
    Piotrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220771.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HgCdTe
    IR detector
    Auger suppression
    HOT detectors
    Opis:
    The paper reports on the photoelectrical performance of the long wavelength infrared (LWIR) HgCdTe high operating temperature (HOT) detector. The detector structure was simulated with commercially available software APSYS by Crosslight Inc. taking into account SRH, Auger and tunnelling currents. A detailed analysis of the detector performance such as dark current, detectivity, time response as a function of device architecture and applied bias is performed, pointing out optimal working conditions.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 2; 159-170
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ageing of cadmium telluride radiation detectors and its diagnostics with low frequency noise
    Autorzy:
    Andreev, A.
    Sik, O.
    Grmela, L.
    Sikula, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221866.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise spectroscopy
    CdTe radiation detectors
    ageing process
    Opis:
    Samples of CdTe single crystals which are used as radiation detectors were periodically measured during a long time interval with different values of an applied voltage. The samples were also periodically exposed during long time periods to high temperatures of 390 K and to rapid changes of temperature from 300 K to 390 K. After 1.5 years of measurements we observed ageing of the samples which resulted in deterioration of their transport characteristics. The resistance of the samples increased significantly and current-voltage characteristics were unstable in time. Noise spectroscopy showed that low frequency noise can be used for detection of CdTe sample ageing as its spectral density increases significantly comparing to the 1/f noise of a high quality sample.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 3; 385-394
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A highly selective vehicle classification utilizing dual-loop inductive detector
    Autorzy:
    Gajda, J.
    Stencel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221403.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive loop detectors
    magnetic signature
    vehicle classification
    Opis:
    In general, currently employed vehicle classification algorithms based on the magnetic signature can distinguish among only a few vehicle classes. The work presents a new approach to this problem. A set of characteristic parameters measurable from the magnetic signature and limits of their uncertainty intervals are determined independently for each predefined class. The source of information on the vehicle parameters is its magnetic signature measured in a system that enables independent measurement of two signals, i.e. changes in the active and reactive component of the inductive loop impedance caused by a passing vehicle. These innovations result in high selective classification system, which utilizes over a dozen vehicle classes. The evaluation of the proposed approach was carried out for good vehicles consisting of 2-axle tractor and a 3-axle semi-trailer.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 473-484
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Tests of Temperature Effects on the Performance of Gan and Sic Photodiodes
    Autorzy:
    Ćwirko, J.
    Ćwirko, R.
    Mikołajczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221315.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical detectors
    UV radiation
    photodiode
    GaN detector
    SiC detector
    Opis:
    The paper presents a study of the performance of some selected UV detectors. Unlike many similar works, the obtained data refer to commercial photodiodes (not only to detector materials). The main task of the research was to determine the influence of the operating temperature and annealing on the detector spectral responsiveness. A comparison of the results obtained for the photodiodes made of GaN and SiC was also performed. Although both kinds of detectors can work at high temperatures for a long time, some modification of their properties was observed. However, for GaN and SiC photodiodes, this modification has a substantially different nature. It is very important for some applications, e.g. fire alarms and a military equipment.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 119-126
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic vehicle classification in systems with single inductive loop detector
    Autorzy:
    Gajda, J.
    Mielczarek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221584.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive loop detectors
    magnetic signature
    vehicle classification
    classification algorithms
    Opis:
    The work proposes a new method for vehicle classification, which allows treating vehicles uniformly at the stage of defining the vehicle classes, as well as during the classification itself and the assessment of its correctness. The sole source of information about a vehicle is its magnetic signature normalised with respect to the amplitude and duration. The proposed method allows defining a large number (even several thousand) of classes comprising vehicles whose magnetic signatures are similar according to the assumed criterion with precisely determined degree of similarity. The decision about the degree of similarity and, consequently, about the number of classes, is taken by a user depending on the classification purpose. An additional advantage of the proposed solution is the automated defining of vehicle classes for the given degree of similarity between signatures determined by a user. Thus the human factor, which plays a significant role in currently used methods, has been removed from the classification process at the stage of defining vehicle classes. The efficiency of the proposed approach to the vehicle classification problem was demonstrated on the basis of a large set of experimental data.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 4; 619-630
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HgCdTe energy gap determination from photoluminescence and spectral response measurements
    Autorzy:
    Murawski, Krzysztof
    Kopytko, Małgorzata
    Madejczyk, Paweł
    Majkowycz, Kinga
    Martyniuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2204344.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    infrared detectors
    HgCdTe
    photoluminescence
    spectral responsivity
    semiconductor energy gap
    Opis:
    The temperature dependence of photoluminescence spectra has been studied for the HgCdTe epilayer. At low temperatures, the signal has plenty of band-tail states and shallow/deep defects which makes it difficult to evaluate the material bandgap. In most of the published reports, the photoluminescence spectrum containing multiple peaks is analyzed using a Gaussian fit to a particular peak. However, the determination of the peak position deviates from the energy gap value. Consequently, it may seem that a blue shift with increasing temperature becomes apparent. In our approach, the main peak was fitted with the expression proportional to the product of the joint density of states and the Boltzmann distribution function. The energy gap determined on this basis coincides in the entire temperature range with the theoretical Hansen dependence for the assumed Cd molar composition of the active layer. In addition, the result coincides well with the bandgap energy determined on the basis of the cut-off wavelength at which the detector response drops to 50% of the peak value.
    Źródło:
    Metrology and Measurement Systems; 2023, 30, 1; 183--194
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating the filling state of OSL detector traps with the optical sampling method
    Autorzy:
    Mandowska, Ewa
    Smyka, Robert
    Mandowski, Arkadiusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2106412.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optically stimulated luminescence
    OSL
    ionizing radiation detectors
    radiative recombination
    signal loss
    Opis:
    Optically stimulated luminescence (OSL) and thermoluminescence (TL) methods are commonly used in dosimetry of ionizing radiation and dating of archaeological and geological objects. A typical disadvantage of OSL detectors is signal loss over a longer time scale. In this article, we present a method of studying this phenomenon as well as monitoring the state of the detector by means of optical sampling. The method was used to determine the OSL signal loss (fading) characteristics of selected potassium feldspars.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 2; 361--371
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectra for the product of Gaussian noises
    Autorzy:
    Kish, L. B.
    Mingesz, R.
    Gingl, Z.
    Granqvist, C.-G.
    Powiązania:
    https://bibliotekanauki.pl/articles/221180.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluctuation-enhanced sensing
    correlation detectors
    indoor and environmental air quality sensing
    Opis:
    Products of Gaussian noises often emerge as the result of non-linear detection techniques or as parasitic effects, and their proper handling is important in many practical applications, including fluctuation-enhanced sensing, indoor air or environmental quality monitoring, etc. We use Rice's random phase oscillator formalism to calculate the power density spectra variance for the product of two Gaussian band-limited white noises with zero-mean and the same bandwidth W. The ensuing noise spectrum is found to decrease linearly from zero frequency to 2W, and it is zero for frequencies greater than 2W. Analogous calculations performed for the square of a single Gaussian noise confirm earlier results. The spectrum at non-zero frequencies, and the variance of the square of a noise, is amplified by a factor two as a consequence of correlation effects between frequency products. Our analytic results are corroborated by computer simulations.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 653-658
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurements of low frequency noise of infrared photo-detectors with transimpedance detection system
    Autorzy:
    Ciura, Ł.
    Kolek, A.
    Gawron, W.
    Kowalewski, A.
    Stanaszek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221094.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    1/f noise
    infrared detectors
    nBn structure
    HgCdTe heterostructures
    noise measurements
    transimpedance detection system
    type II InAs/GaSb superlattice
    Opis:
    The paper presents the method and results of low-frequency noise measurements of modern mid-wavelength infrared photodetectors. A type-II InAs/GaSb superlattice based detector with nBn barrier architecture is compared with a high operating temperature (HOT) heterojunction HgCdTe detector. All experiments were made in the range 1 Hz - 10 kHz at various temperatures by using a transimpedance detection system, which is examined in detail. The power spectral density of the nBn’s dark current noise includes Lorentzians with different time constants while the HgCdTe photodiode has more uniform 1/f - shaped spectra. For small bias, the low-frequency noise power spectra of both devices were found to scale linearly with bias voltage squared and were connected with the fluctuations of the leakage resistance. Leakage resistance noise defines the lower noise limit of a photodetector. Other dark current components give raise to the increase of low-frequency noise above this limit. For the same voltage biasing devices, the absolute noise power densities at 1 Hz in nBn are 1 to 2 orders of magnitude lower than in a MCT HgCdTe detector. In spite of this, low-frequency performance of the HgCdTe detector at ~ 230K is still better than that of InAs/GaSb superlattice nBn detector.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 3; 461-472
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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