1 中国科学院西安光学精密机械研究所，陕西 西安 710119
2 西安电子科技大学 物理与光电工程学院，陕西 西安 710071
3 西安工业大学 光电工程学院，陕西 西安 710021
When the collimator is placed horizontally and installed obliquely, its optical parameters will be greatly different due to different stress states. In order to accurately evaluate the focal length of collimator, according to the mapping relationship between the point on the focal plane of the collimator and the angle of the total station, an accurate mathematical model of the relationship between the focal length and the angle of the total station under the condition of oblique installation is established, the principle projection error caused by the rotation of the vertical axis of the total station is corrected. Several groups of data are collected by total station and experimental verification is carried out. After correcting the distortion, the focal length calculated by each testing point when the line segment is parallel to the vertical wire are 1 980.03 mm, 1 983.45 mm, 1 982.79 mm, the average focal length, i.e. the true value, is 1 982.09 mm. When the distortion is corrected but the projection error is not corrected, the focal length calculated from each testing point when the line segment is parallel to the horizontal wire of the reticle is 996.42 mm, 995.23 mm, 995.22 mm, the relative error of the average focal length is 50.2%. The range of focal length calculated by each testing point when the line segment is located in different quadrants and parallel to the horizontal wire of the reticle is 4.74 mm after correcting the projection error and distortion, the average focal length of all testing points is 1982.69 mm, the difference between the average value and the true value is 0.6 mm. The maximum relative error between the extended uncertainty of the focal length calculated by different testing point and the true value of the focal length is 0.36%. This value is far less than the stipulation in GB/T 9917.1-2002 that the relative error between the measured focal length and the nominal focal length in the photographic lens does not exceed ±5%. The experimental results show that the model has universality and high accuracy, the phase of the target slit in the reticle is allowed to be a random value, there is no need to adjust the slit to be strictly parallel to the vertical wire of the total station, the model has great engineering application value for the in-situ detection of the focal length of the collimator under the condition of oblique installation.
焦距 畸变 投影误差 原位标定 随机相位 focal length distortion projection error in-situ calibration random phase 红外与激光工程
2022, 51(11): 20220124
1 中国科学院西安光学精密机械研究所, 陕西 西安 710119
2 中国科学院大学, 北京 100049
针对实验室高星等目标模拟问题,设计了一种由光源、可调光阑、积分球、光电探测器和平行光管组成的弱光单星模拟器,用于检测探测相机、星敏感器的星等探测能力。推导了光电探测器读数、积分球出口光谱辐亮度随可调光阑遮拦比的变化关系,结合星等定义公式和像面照度公式,介绍了弱光单星模拟器的工作原理,解决了高星等目标的标定难题。理论分析了弱光单星模拟器的星等模拟范围及精度,结果表明其最高可模拟19.5 Mv星等,精度为11.6%;模拟低于15 Mv星等时,精度优于8%。实验结果表明:实验室内,模拟星等与KLL-04型弱光照度计实测星等的相对误差最大为7.09%;实验室的探测相机与天文观测的探测相机所测得的星等探测能力在6.5 Mv处的相对误差为1.9%,在15.2 Mv处的相对误差为2.6%。所设计弱光单星模拟器能够对高星等目标进行有效模拟。
测量 星模拟器 光电探测器 高星等 地面标定 光学学报
2017, 37(10): 1012001
哈尔滨工业大学航天学院, 黑龙江 哈尔滨 150001
采用点插值法、循环矩阵模型、拉普拉斯正则化方法和共轭梯度迭代法, 解决了空间变化图像复原过程中空间变化点扩展函数的获取、反卷积的计算模型、反问题的病态性以及复原算法等问题。在此基础上, 建立了空间变化图像复原方法, 并分析了图像复原的基本模型。最后, 通过仿真对比了提出的空间变化图像复原算法和空间不变图像复原算法, 结果表明, 空间变化算法的图像复原结果好于空间不变算法。
图像处理 线性空间变化 主元分析 点插值 拉普拉斯正则化
