FMCW LiDAR-based ranging system application to VR optical measurement

VR installation and detection tasks require the ranging system to combine a high accuracy with a large depth of field and to collect reflection peaks from multiple reflective surfaces. Currently, there is no corresponding device to assist VR optical assembly detection, including tilt, eccentricity, and spacing of lens assembly. To fill this gap, this study applied the FMCW lidar-based ranging system to VR optical testing. Through nonlinear correction and introducing an axicon lens in the optical system, a high-precision FMCW ranging system with a 20 mm depth of field was obtained. The ranging accuracy and ranging resolution of the system could reach 1.3 μm and 14.3 μm, respectively, and the planes of the three glass layers could be simultaneously measured. The proposed system application made it possible to perform the installation and adjustment detection of the multi-lens optical system of VR.