Calibration for integrated parameters of visible photoelectricimaging system

In order to evaluate the integrated properties of visible photoelectric imaging system exactly and objectively, the calibration equipment was developed. The equipment was composed of integrating sphere, standard card, off-axis reflective collimator, mechanical adjustment bench, video acquisition module and comprehensive software. It could complete a measurement of resolution,contrast,optical transfer function(MTF),noise power spectrum, noise equivalent light and sensitivity.For a certain visible photoelectric imaging product, the effectiveness of the equipment was proved. The comprehensive parameter measurements are given:the cut-off frequency is 39.4 mm-1, the contrast is 76.5%,the root-mean-square (RMS) noise is 2.14 mV,the noise equivalent light(NEL) is 0.045 5 cd/m2 and the sensitivity is 47 mV（cd/m2)-1. In addition, an illuminometer and a standard video pattern generator were respectively adopted for making calibration, results show that the maximum relative measurement errors of integrating sphere and the signal acquisition system are -2.3% and 1%.