Dispersion coefficient measuring system of automatic alignment based on novel mathematical model
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摘要: 光学玻璃是光电技术产业的基础和重要组成部分,其色散系数是反应其性能的重要常数。利用CCD成像与机器视觉自动对准技术,在考虑了空气折射率对色散系数测量精度影响的基础上,对传统的色散系数测量公式重新进行了数学建模。多波段小型平行光管设计过程中,在校正了与孔径有关像差的基础上,对像差有特征意义的子午面内的光线光路进行了计算,求出了理想像与实际像的位置相差,实现了波段小型平行光管对无穷远目标的模拟。最后,综合运用了多波段小型平行光管设计技术、自动成像技术、光栅角位移测量技术,设计了图像自动对准式色散系数测量系统并实现了高精度测量。利用已知色散系数的光学玻璃对该测量系统进行了标定,通过精度分析可知,测试结果与标准值绝对误差不超过2.309 310-6。Abstract: Optical glass is the foundation and an important part of photovoltaic technology industry, and the dispersion coefficient is an important constant which responses performance. The novel mathematical model was reestablished instead of the traditional dispersion coefficient measurement formula based on CCD imaging and automatic alignment technique of machine vision in this system. The influence of refractive index of air was considered for dispersion coefficient measurement accuracy. In the design process of small multiband collimator, on the basis of adjusting the aberration related to aperture, the optical path of the light was calculated, which was characteristic sense for aberration in meridian inner surface, the location aberration was obtained between the ideal image and the actual image, the simulation of infinity goals was achieved by a small band collimator. Finally, the technique of multiband small parallel light pipe, automatic imaging processing and grating angular displacement measurement were applied in this system. The automatic image alignment of dispersion coefficient measurement system was designed and high precision measurement was realized. It can know from the accuracy of analysis that the measurement system is calibrated with the known dispersion coefficient of optical glass, and the results show that the absolute errors is less than 2.309 310-6.
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Key words:
- dispersion coefficient /
- V prism /
- CCD imaging technique /
- parallel light pipe
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