Method for measuring wavefront aberration of progressive muilti-focus lens based on beam expanding system
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摘要: 利用波前传感器测量自由曲面镜片时，由于自由曲面镜片的直径通常大于波前传感器的接收孔径，主要采用子孔径拼接技术测量镜片的波前像差。针对子孔径拼接技术测量中存在着操作繁琐、数据处理量大等问题，提出渐进多焦点镜片波前像差的扩束测量方法，得到渐进多焦点镜片中央直径为22 mm圆形区域内的波前像差。为了验证试验的可靠性，将测量得到的波前像差泽尼克表述中的离焦项转换为球镜度，与条纹偏折法测量得到镜片的球镜度进行对比实验，实验结果证明了渐进多焦点镜片波前像差的扩束测量方法可以用于渐进多焦点镜片波前像差的检测。Abstract: In current measurement of the freeform spectacle lenses using wavefront sensor, the diameter of progressive addition lenses is usually larger than the receiving aperture of wavefront sensor, it is mainly used to measure the wavefront aberration of the lens by means of the sub-aperture stitching technique.In order to solve the problems of complicated operation and large amount of data processing in the measurement of the sub-aperture stitching technology, a method of beam expanding-shrinking system measurement for wavefront aberration of progressive addition lens was presented, through which the wavefront aberration within 22 mm diameter circular area of progressive addition lens could be got.In order to verify the reliability of the test, the measured defocus co-efficients in Zernike representation of wavefront aberration were transformed into spherical mirror degree, and compared with the spherical mirror degree measured by fringe deflection method. Results prove that the method based on the beam expanding-shrinking system is feasible.
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图 1 畸变波前入射H-S传感器示意图
Figure 1. Schematic diagram of distortion wavefront entering H-S sensor
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图 4 镜片的波前像差测量实验装置图
Figure 4. Experiment device for lens wavefront aberration measurement
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图 6 镜片波前像差Zernike表述中离焦项
Figure 6. Defocus term in Zernike statement of lens wavefront aberration
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图 7 H-S波前传感器测量的球镜度分布图
Figure 7. Distribution of sphere degree measured by H-S wavefront sensor
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图 8 条纹偏折法测量的球镜度分布图
Figure 8. Distribution of sphere degree measured by ray deflection method
表 1 Zernike多项式前四阶系数
Table 1 First four order coefficients of Zernike polynomial
序列号 阶 频 系数 类型 1 0 0 7.795 波面平移 2 1 -1 -1-- Y向倾斜 2.7 3 1 1 -1.365 X向倾斜 4 2 -2 -0.161 45°向像散 5 2 0 -0.239 离焦 6 2 2 -0.036 0°向像散 7 3 -3 -0.011 Y向三叶草 8 3 -1 -0.004 X向彗差 9 3 1 0.01 Y向彗差 10 3 3 -0.005 X向三叶草 11 4 -4 -0.001 Y向四频像差 12 4 -2 -0.001 Y向次级像散 13 4 0 0.01 三阶球差 14 4 2 -0.007 X向次级像散 15 4 4 0.001 X向四频像差 
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