Fig. 1. Schematic of LED-point test method

Fig. 2. Schematics of detector imaging system test of spaceborne detector

Fig. 3. Test results of standard deviation-mean logarithm PTC in full frame mode

Fig. 4. Test results of variance-mean PTC in full frame mode

Fig. 5. Test images of LED-point method

Fig. 6. Test results of LED-point method

Fig. 7. Test results of 4 different pixels. （a1），（b1），（c1），（d1） Trend map of the 9 LED pixel values under different light intensities； （a2），（b2），（c2），（d2） The inflexion point of the curve obtained by nonlinear fitting the overflow pixel DN value data， and the corresponding DN value of the point in the center pixel curve

Fig. 8. Test result of LED point using traditional FWC test method

Table 1. PTC test results of detector in satellite payload

Table 2. Test results of detector with LED-point test method.