This paper proposed a "high-speed imaging + digital processing" evaluation method to solve the problem of scintillation noise of low light image intensifiers under low illumination, which fills the gap in the quantitative evaluation of scintillation noise characteristics under low illumination in China. It was found that the scintillation noise is mainly characterized by scintillations with a diameter over 50μm and a duration of sub-microsecond or less. The frequency and the brightness of the scintillations are used to quantitatively evaluate scintillation noise. The effects of the input illuminance and luminous gain on the scintillation noise of the domestic low light image intensifier were investigated by the proposed method. With the increase of input illuminance, the frequency of scintillation noise increases linearly, and the brightness does not change obviously. As the luminous gain of the image intensifier increases, the frequency of scintillation noise increases linearly, but the rate of increase in scintillation frequency is higher than that of luminous gain increase. Based on the characteristics of scintillation noise, such as size, duration, intensity, and the variation law with various conditions, the scintillation noise of the image intensifier can be further studied. The quantitative evaluation method of scintillation noise based on scintillation noise frequency and average equivalent input electron quantity proposed in this paper is of great significance to the breakthrough of scintillation noise and the improvement of the performance of image tubes under low illumination in the future.
The enhanced x-ray timing and polarimetry mission (eXTP) is a flagship observatory for x-ray timing, spectroscopy and polarimetry developed by an international consortium. Thanks to its very large collecting area, good spectral resolution and unprecedented polarimetry capabilities, eXTP will explore the properties of matter and the propagation of light in the most extreme conditions found in the universe. eXTP will, in addition, be a powerful x-ray observatory. The mission will continuously monitor the x-ray sky, and will enable multi-wavelength and multi-messenger studies. The mission is currently in phase B, which will be completed in the middle of 2022.
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