鉴于全视角高精度三维测量仪中现有光学成像系统无法同时满足大视角、高分辨率和低畸变等技术指标，为此设计了一种能够同时克服上述缺陷的光学成像和畸变校正系统。采用复杂化双高斯结构形式进行f-θ镜头设计，引入非球面提高系统成像质量。实验结果表明，设计的光学系统为长焦广角低畸变高分辨率光学系统，在环境温度-10 ℃~70 ℃下，视场角达到90°，畸变小于-0.001 67%，传递函数达到0.4@100 lp/mm，可实现工作距离3 m~100 m成像清晰。同时，光学系统中非球面镜片的面型精度会对成像质量产生很大的影响，根据公差分析，非球面的面型精度PV值小于0.17 μm时系统成像质量满足要求，实际加工过程中非球面面型PV值达到0.158 μm，传递函数达到设计指标要求，提高了系统的成像质量。

Current optical imaging system in the three-dimensional measuring instrument with high precision and full view cannot satisfy the technological demands of large viewing angle, high resolution and low distortion simultaneously, we therefore designed a kind of optical imaging and distortion correction system, which could overcome above defects. To improve the imaging quality of the system, the design of f-θ lens was performed with a complicated double-Gauss structure, and the aspheric surface was introduced. The optical imaging system was machined and tested.Results show that the optical system designed has the characteristics of long focal length, wide angle ,low distortion and high resolution, it can achieve the field-of-view of 90°,the distortion of <-0.001 67% and the modulation transfer function(MTF) of 0.4@100 lp/mm without reducing the image quality obviously in the large working range of 3 m~100 m under the ambient temperature of -10℃~70℃. Moreover, it is found that the surface figure accuracy of aspheric lens in optical system has a great influence on the imaging quality, tolerance analysis shows that the imaging quality of optical system can meet the requirement, when the surface accuracy peak-valley(PV) value of aspheric surface is less than 0.17 μm. In actual machining process, the PV value of aspheric surface can reach 0.158 μm, and the MTF can also meet the design requirements. Hence, the imaging quality of the system can be improved.