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    Wyświetlanie 1-5 z 5
    Tytuł:
    Output signal change analysis of an uncooled microbolometer focal plane array with respect to varying control voltages and operating point temperature
    Autorzy:
    Ligienza, A.
    Bieszczad, G.
    Sosnowski, T.
    Gogler, S.
    Krupiński, M.
    Firmanty, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114040.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Focal Plane Array
    microbolometer
    Opis:
    This paper presents results of output signal analysis of uncooled microbolometric focal plane array FPA. The analysis focuses on detectors manufactured by ULIS. The signal has been tested against varying control voltages, it is blind microbolometer biasing VSK and active microbolometer biasing VFID. The working point temperature of the environment was also altered in range from 5°C to 60°C. Such analysis can be used to check the results against current mathematical model of FPA’s behavior and verify validity of the measurement method in varying working conditions. Later it could allow explore possibility to design corrective algorithms.
    Źródło:
    Measurement Automation Monitoring; 2018, 64, 4; 95-98
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of thermal behavior of detector array surface with the use of microscopic thermal camera
    Autorzy:
    Bieszczad, G.
    Kastek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220546.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermovision
    microbolometer focal plane array
    self-heating
    microscopic thermography
    Opis:
    Modern infrared cameras are constructed with two main types of infrared detectors: photon detectors and thermal detectors. Because of economic reasons, vast numbers of modern thermal cameras are constructed with the use of infrared microbolometric detectors which belong to the group of thermal detectors. Thermal detectors detect incident infrared radiation by measuring changes of temperature on the surface of a special micro-bridge structure. Thermal detectors, like microbolometric detectors on one hand should be sensitive to changing temperature to accurately measure incoming infrared radiation from the observed scene, on the other hand there are many other phenomena that change the temperature of the detector and influence the overall response of the detector. In order to construct an accurate infrared camera, there is a need to evaluate these phenomena and quantify their influence. In the article the phenomenon of self heating due to the operation of the readout circuit is analyzed on an UL 03 19 1 detector. The theoretical analysis is compared with the results of conducted measurements. Measurements with a type SC7900VL thermographic camera were performed to measure the thermodynamic behavior of the UL 03 19 1 detector array.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 679-690
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda korekcji czułości matrycowych detektorów podczerwieni
    Response nonuniformity correction method for infrared focal plane arrays
    Autorzy:
    Orżanowski, T.
    Sosnowski, T.
    Madura, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/154581.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    korekcja niejednorodności
    matryca detektorów podczerwieni
    nonuniformity correction
    infrared focal plane array
    Opis:
    W artykule przedstawiono metodę korekcji czułości matrycowych detektorów podczerwieni, która nie wymaga pamiętania pełnej tablicy współczynników korekcyjnych. Wartości współczynników korekcji czułości dla każdej kolumny detektorów IR w matrycy są aproksymowane wielomianem n-tego stopnia w funkcji numeru wiersza. Pozwala to na zmniejszenie wymagań dla systemu cyfrowego przetwarzania sygnału z matrycy, ponieważ w pamięci są przechowywane tylko współczynniki wielomianów dla poszczególnych kolumn matrycy zamiast współczynniki korekcyjne dla wszystkich detektorów. Opracowana metoda jest tylko nieznacznie gorsza od metody dwupunktowej używającej kompletnych tablic współczynników korekcyjnych.
    In this paper a nonuniformity correction (NUC) method for infrared focal plane array (IRFPA) response that uses a reduced table of correction coefficients is presented. In this method the gain correction coefficients of infrared detectors in array are estimated by means of the approximation polynomials (Eq. 1) of the row number for the each detector column in the array. It allows reducing significantly hardware requirements for the IRFPA output readout system because the system has to store in a memory just the poly-nomial coefficients for particular columns instead of the correction coefficients for all detectors in the array. The polynomial coefficients are assigned by the least mean square method using the set of true gain coefficients which are obtained, as in the two-point correction procedure, by means of infrared blackbodies (Fig. 2). After that the gain coefficients estimated by these polynomials can be used in the standard NUC algorithm to compensate a detector response nonuniformity. The real-time processing of a detector response is possible especially when the field-programmable gate array devices are applied to the IRFPA readout system. The proposed NUC method is just a bit worse than the two-point correction with the full table of the gain correction coefficients (Fig. 4).
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 10, 10; 1108-1111
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Discussion around IR material and structure issues to go toward high performance small pixel pitch IR HOT FPAs
    Autorzy:
    Gravrand, Olivier
    Baier, Nicolas
    Ferron, Alexandre
    Rochette, Florent
    Lobre, Clément
    Bertoz, Jocelyn
    Rubaldo, Laurent
    Powiązania:
    https://bibliotekanauki.pl/articles/2204207.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    mid-wave infrared
    focal plane array
    high operating temperature
    small pitch
    modulation transfer function
    finite element method
    Opis:
    In the last decade, infrared imaging detectors trend has gone for smaller pixels and larger formats. Most of the time, this scaling is carried out at a given total sensitive area for a single focal plane array. As an example, QVGA 30 μm pitch and VGA 15 μm pitch exhibit exactly the same sensitive area. SXGA 10 μm pitch tends to be very similar, as well. This increase in format is beneficial to image resolution. However, this scaling to even smaller pixels raises questions because the pixel size becomes similar to the IR wavelength, but also to the typical transport dimensions in the absorbing material. Hence, maintaining resolution for such small pixel pitches requires a good control of the modulation transfer function and quantum efficiency of the array, while reducing the pixel size. This might not be obtained just by scaling the pixel dimensions. As an example, bulk planar structures suffer from excessive lateral diffusion length inducing pixel-to-pixel cross talk and thus degrading the modulation transfer function. Transport anisotropy in some type II superlattice structures might also be an issue for the diffusion modulation transfer function. On the other side, mesa structures might minimize cross talk by physically separating pixels, but also tend to degrade the quantum efficiency due to a non-negligible pixel fill factor shrinking down the pixel size. This paper discusses those issues, taking into account different material systems and structures, in the perspective of the expected future pixel pitch infrared focal plane arrays.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144561
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long wavelength type-II superlattice barrier infrared detector for CubeSat hyperspectral thermal imager
    Autorzy:
    Rafol, Sir B.
    Gunapala, Sarath D.
    Ting, David Z.
    Soibel, Alexander
    Khoshakhlagh, Arezou
    Keo, Sam A.
    Pepper, Brian J.
    Hill, Cory J.
    Maruyama, Yuki
    Fisher, Anita M.
    Sood, Ashok
    Zeller, John
    Wright, Robert
    Lucey, Paul
    Nunes, Miguel
    Flynn, Luke
    Babu, Sachidananda
    Ghuman, Parminder
    Powiązania:
    https://bibliotekanauki.pl/articles/2204204.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    type-II superlattice
    focal plane array
    infrared detector
    quantum efficiency
    noise equivalent difference temperature
    dark current density
    anti-reflective coating
    Opis:
    The hyperspectral thermal imaging instrument for technology demonstration funded by NASA’s Earth Science Technology Office under the In-Space Validation of Earth Science Technologies program requires focal plane array with reasonably good performance at a low cost. The instrument is designed to fit in a 6U CubeSat platform for a low-Earth orbit. It will collect data on hydrological parameters and Earth surface temperature for agricultural remote sensing. The long wavelength infrared type-II strain layer superlattices barrier infrared detector focal plane array is chosen for this mission. With the driving requirement dictated by the power consumption of the cryocooler and signal-noise-ratio, cut-off wavelengths and dark current are utilized to model instrument operating temperature. Many focal plane arrays are fabricated and characterised, and the best performing focal plane array that fulfils the requirements is selected. The spectral band, dark current and 8-9.4 μm pass band quantum efficiency of the candidate focal plane array are: 8-10.7 μm, 2.1∙10ˉ⁵ A/cm², and 47%, respectively. The corresponding noise equivalent difference temperature and operability are 30 mK and 99.7%, respectively. Anti-reflective coating is deposited on the focal plane array surface to enhance the quantum efficiency and to reduce the interference pattern due to an absorption layer parallel surfaces cladding material.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144569
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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