提出一种新型可变焦非球面人工复眼结构,该结构将曲面复眼划分为三个扇形区域, 不同区域内的微透镜焦距不同, 使得人工复眼能够在一定范围内实现焦距调节.通过计算及仿真分析, 对各级微透镜结构进行非球面优化, 优化后各级微透镜的球差值为优化前的1/1000, 提高了曲面复眼的边缘成像质量.采用模压成型工艺制备得到子眼个数为61,基底直径为8.66 mm的变焦距非球面人工复眼样品, 并标定各子眼的相互位置, 建立多个子眼同时识别目标的定位数学模型.搭建了人工复眼成像性能测试及目标定位测试平台进行实验验证, 实验表明人工复眼相机能够捕获清晰的圆形和十字型光斑图像, 各扇形区域内采集的图像尺寸不同, 能够实现一定范围内变焦成像.通过多个微透镜捕捉目标,利用入射角度与像点重心之间的关系解出目标点坐标, 实验结果的定位误差值在10%以内.

A new type of aspheric artificial compound eye with variable focal length was proposed.The structure divides the curved compound eye into three fan shaped areas, and the focal lengh of the microlens in different areas is different, so that the artificial compound eye can achieve the focal length adjustment within a certain range.Through calculation and simulation analysis, aspheric surface optimization is carried out for the microlens structure at all levels. After optimization, the spherical difference value of each level of micrilens is 1/1000 before optimization, which improved the edge image quality of curved compound eyes. The aspherical artificial compound eye sample with the number of eyes of 61 and the diameter of the base of 8.66 mm is prepared by using the molding method. Calibrating the mutual relationship between the eyes of the child and establishing a mathematical model for the simultaneous identification of multiple sub eyes. The artificial compound eye imaging performance test and target positioning test platform are built. Through experimental verification, the artificial compound eye camera can acquire clear circular and cross-shaped light spot images. The size of images collected in each sector area is different, and the zoom imaging can be realized within a certain range. By capturing the target with multiple microlenses and the relationship between the incident angle and the center of gravity of the image point, the coordinates of the target point are calculated. The experimental results show that the positioning error value is less than 10%.