Experimental setup of streak camera calibration.
Streaks in calibration image, time separation between adjacent streaks is known and fixed.
Calibration data from a narrow spatial section in Fig. 2.
Calibration data (solid) and fitted curve (triangle) for first peak in Fig. 3, Gaussian function matches data well.
Calibration data obtained under a slow sweep-rate setting, with overlapped streaks (solid) and fitted curves (dot). Fitting with appropriate constraints successfully distinguish two overlapped peaks. It is evident that position of the second peak given by fitting method is not the place where its amplitude is max.
Calibration data are added modest (a) and intense (b) artificial noise to evaluate constrained fitting method, using the same data as Fig. 3. With modest (c) and intense (d) artificial noise, deviations of position measurements against non-noise one are within 0.05 pixel and 1.5 pixel, respectively.
Three-dimensional view of full-screen sweep-rate data, which contain more than 34 000 data points.
Sweep-rate along time direction, it is a two-dimensional projection of data in Fig. 7, ignoring differences along spatial direction. There is an evident increase where t > 350 pixel, indicating a steeper slope of sweep voltage there.
(a) Full-screen sweep-rate map and one typical cross section that will be analyzed in detail to get an analytical form of sweep-rate. (b) Extracted data from a narrow spatial section showed in (a), along with a fitted polynomial function.
(a) Calibration image that will be used for fiducial benchmark. (b) Second streak of (a) in detail, showing an evident distortion.
Calibration image before (a) and after (b) temporal linearized.
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