The designed lens central thickness measuring optical system is a kind of new system based on chromatic confocal principle, which can fast and automatically measure center thickness of lens without contact of lens surfaces. In order to expand measuring range of device, multiple configuration modes are established to eliminate monochromatic aberrations within each configuration, and enlarge the D-value of image distance to increase the longitudinal chromatic aberration. In this way, the longitudinal chromatic aberration of the system can reach about 30 mm in the wavelength range from 400 nm to 1000 nm. The maximum measurable lens thickness can be more than 30 mm by using this optical system. Measurement of three different lenses whose central thicknesses are 6, 15 and 30 mm is done. The results show that the measuring accuracies for the three lenses are ±2.5, ±3.5 and ±5.0 μm.

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Solar simulator is an important application in non-imaging optics, its optical path is long because of the special optical system, and the collimating system accounts for nearly half of the whole optical path when the dual separation collimating lens are used. In order to achieve the miniaturization of solar simulator, the telephoto lens is used, and the telephoto lens has a short back focal length. When the dual separation collimating lens is replaced by the telephoto lens, the optical path of the collimating system can be shorter and the whole solar simulator optical path can be more compact. The collimating system with three-piece telephoto lens is designed, and the impact on the solar simulator technical specifications is studied through LightTools software simulation analysis. The simulation results show that although the solar simulator technical specifications change little. The simulator optical path becomes shorter, therefore the solar simulator can be miniaturized by using the telephoto lens as collimating optical system.