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- W2028452238 abstract "Thermovision systems based on the pyroelectric vidicon (PV) are low-cost non-cooled devices for image creation in far infrared range of spectrum. For such systems it is necessary to form the positive pedestal charge to prevent PV from blanking and to decrease electron beam delay. Secondary emission pedestal mode (SEPM) is most frequently used for this purpose. It provides pedestal creation during retrace time of horizontal scanning. This paper is dedicated to examining of the SEPM influence on pyroelectric vidicon focusing and deflection mode changes, analysis results of the influence and finding possible ways to correct them. It is shown that SEPM causes deflection decreasing during retrace raster, performed estimation shows that trace and retrace rasters are considerably different. The trace and retrace rasters matching enables to improve the power parameters of the scanning and to increase target commutation time (sensitivity) and number of active scanning lines (spatial resolution). The methods of the trace and retrace raster matching are discussed. The advantages and shortcomings of these methods are pointed out. An estimation of thermovision system parameters improvement is calculated. The obtained results provide a good basis for designing low- cost portable thermovision systems with improved power parameters, resolution and sensitivity.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W2028452238 date "2000-06-14" @default.
- W2028452238 modified "2023-09-23" @default.
- W2028452238 title "<title>Improvement of pyroelectric vidicon performance by trace and retrace scanning raster matching</title>" @default.
- W2028452238 doi "https://doi.org/10.1117/12.388450" @default.
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