Simultaneous realization of high-precision and universal detection of freeform surfaces is an important and urgent problem to be solved in optical inspection. To solve this problem, a Twyman-Gre e n interferometric optical probe in conjunction with a standard retroreflective spherical lens design is be proposed in this paper. The detection technology does not need to align the optical probe wit h the normal direction of the measured surface, and only two translational axes and one rotation axis are required for measurement, the location of the measured point is determined by the null interference fringes obtained by the interference of the reference light and the detection light, thereby obtaining the three-dimensional surface shape data of the measured surface. The basic parameters of the optical probe are determined by theoretical calculations and a mathematical model is established. The simulat ion was performed using matlab, and the feasibility of the system structure was verified by building experiments.
Virtual Reality (VR) products serve for human eyes ultimately, and the optical properties of VR optical systems must be consistent with the characteristic of human eyes. The monocular coaxial VR optical system is simulated in ZEMAX. A diffraction grating is added to the optical surface next to the eye, and the lights emitted from the diffraction grating are deflected, which can forming an asymmetrical field of view(FOV). Then the lateral chromatic aberration caused by the diffraction grating was corrected by the chromatic dispersion of the prism. Finally, the aspheric surface was added to further optimum design. During the optical design of the system, how to balance the dispersion of the diffraction grating and the prism is the main problem. The balance was achieved by adjusting the parameters of the grating and the prism constantly, and then using aspheric surfaces finally. In order to make the asymmetric FOV of the system consistent with the angle of the visual axis, and to ensure the stereo vision area clear, the smaller half FOV of monocular system is required to reach 30°. Eventually, a system with asymmetrical FOV of 30°+40° was designed. In addition, the aberration curve of the system was analyzed by ZEMAX, and the binocular FOV was calculated according to the principle of binocular overlap. The results show that the asymmetry of FOV of VR monocular optical system can fit to human eyes and the imaging quality match for the human visual characteristics. At the same time, the diffraction grating increases binocular FOV, which decreases the requirement for the design FOV of monocular system.