Design of multi-spectral common aperture infinity collimator

In order to calibrate the consistency of optical axes of the field vehicle photoelectric tracker, a method for using the multi-spectral common-aperture infinity collimator, reflex light tubes, and moving mechanism was put forward to realize the calibration of each optical axis, and the optical design of collimator and the overall structural design were performed.In addition, the main errors affecting the calibration were analyzed. Results show that the overall size of the target is 750 mm ×120 mm × 100 mm, it uses an off-axis hyperboloidal reflective optical system with a focal length of 1 200 mm, an aperture of 50 mm and a field of view of 2°. The reticle uses ZnS and the light source uses tungsten bromine lamp.The system is optimized with Zemax optical design software, the maximum focal spot root-mean-square(RMS) achieves 35.766 μm, and the optical transfer functions (OTFs) are all higher than 0.3 at the spatial frequency of 5 lp/mm. All the indicators meet the calibration requirements.