Radiometric Calibration Chain Design Based on Uniform Collimated Laser Source

A uniform collimated laser source, composed of the integrating sphere source and the off-axis parabolic, is designed. The calibration process is analyzed theoretically, and Monte Carlo ray tracing method is used to simulate and analyze the design model. The results show that when the calibration source is composed of an 8cm diameter integral sphere,10mm diameter exit port, and 1.000.mm focal length, and an off-axis angle 60° parabolic mirror, the maximum divergence angle is 7.5mrad and the uniformity of irradiance is 99.31%. Finally, the uncertainty of radiometric calibration process is analyzed, and the calibration accuracy of 0.335% for imaging spectrometer can be achieved by using the radiation calibration laser source.