This paper presents an investigation of CCD camera photo-response nonuniformity (PRNU) with a laser-plasma soft X-ray (SXR) source operating at the “water window” (WW) region (2.3 - 4.4 nm). We have investigated a scientific X-ray CCD camera including a high quantum efficiency back-illuminated CCD sensor. As a radiation source, a compact, nitrogen laser-plasma SXR source based on a double stream gas puff target was employed. A Ti filter is used to enable a single line of the radiation at 2.88 nm in the WW spectral range. PRNU and other CCD camera noise characteristics are estimated on the basis of experimental data. The image subtraction method is applied for noise components estimation. The obtained test results are widely presented and discussed.
This paper presents a modified two-point calibration algorithm with useful method of pixel offset correction coefficients update for infrared focal plane arrays (IRFPAs). The new approach to IRFPA response nonuniformity correction (NUC) consists in the use of pixel response change determined at the actual operating conditions in relation to the reference ones by means of shutter to compensate a pixel temporal drift. This approach permits to estimate a pixel offset efficiently and remove any optics shading effect in the corrected output image as well. Moreover, the proposed NUC algorithm is easy to implement by hardware too. To show efficiency of the modified two-point calibration algorithm some test results for microbolometer IRFPA are presented.
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