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Accurate and efficient characterization of streak camera using etalon and fitting method with constraints
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup of streak camera calibration.

Image of FIG. 2.
FIG. 2.

Streaks in calibration image, time separation between adjacent streaks is known and fixed.

Image of FIG. 3.
FIG. 3.

Calibration data from a narrow spatial section in Fig. 2.

Image of FIG. 4.
FIG. 4.

Calibration data (solid) and fitted curve (triangle) for first peak in Fig. 3, Gaussian function matches data well.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

Three-dimensional view of full-screen sweep-rate data, which contain more than 34 000 data points.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

(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.

Image of FIG. 10.
FIG. 10.

(a) Calibration image that will be used for fiducial benchmark. (b) Second streak of (a) in detail, showing an evident distortion.

Image of FIG. 11.
FIG. 11.

Calibration image before (a) and after (b) temporal linearized.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Accurate and efficient characterization of streak camera using etalon and fitting method with constraints