共查询到19条相似文献,搜索用时 62 毫秒
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引言在光学系统中,镜头对一定距离的目标成像有一个最佳像面位置。如果偏离将造成图像成像模糊,导致后续的信息提取和处理工作出现测量误差。为了提高信息提取的精确度,需要对光学系统进行图像的聚焦检测。 相似文献
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以云母波片为例,根据椭偏测量相位原理,利用椭偏仪的温控装置,对不同温度下云母波片的延迟量进行测量,再根据延迟量与最大双折射率的数学关系,得到相应温度下云母波片的最大双折射率从而验证椭偏测量法是切实、可行的,也是可靠的。 相似文献
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倾斜镜面成像的自动调焦方法 总被引:1,自引:0,他引:1
倾斜镜面成像系统的像面与光轴倾斜,仅利用轴向自动调焦无法实现像面整体清晰。为此提出一种基于图像清晰度判断的自动调焦方法。该方法将轴向调焦与角度调焦相结合,通过步进方式平移和旋转像接收面,利用离焦函数判断聚焦情况,采用数据拟合回归的方法实现了像面整体清晰。该方法在椭偏成像系统的应用结果验证了其有效性,调焦精度达到微米量级。 相似文献
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由于表面散射浊度测量具有测量范围度,线性度好等优点而受到人们的重视,但在连续检测中由于试样流速变化或试样表面张力变化而引起液面高度不同,导致浊度测量误差。本文提出了用光学自动增益控制法来消除这种影响,在理论上对该方法进行了分析计算,并在实验中得到了验证。 相似文献
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本文结合实际检测工作,分析了配装眼镜光学中心水平距离测量结果不确定度的来源并结合实际应用的情况,详细介绍了光学中心水平距离测量结果的不确定度评定方法。 相似文献
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Optical performance results are reported for a molded-glass biaspheric lens. The 6-mm optical diam lens is intended for use in a laser-based optical disk application. The design with fabrication tolerances has an expected on-axis transmitted wave-front performance of 0.06-wave rms optical path difference (OPD) when tested at 0.6328 ,4m and a numerical aperture of 0.45. Transmitted wave-front aberrations were measured on actual molded lenses using a heterodyne interferometer. Typical performance was 0.05-0.08-wave rms- OPD. Experimental results involving mold rotation indicate that lens performance is primarily limited by a surface figure accuracy of one of the molds. 相似文献
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A mechanism is established for the automatic addition and deletion of optical elements during the course of lens optimization. Two lens-form parameters, quantifying the symmetry of the optical system and the optical-power distribution among the individual lens elements, are used as criteria in this automatic procedure. Design examples are provided that demonstrate the practicability of the scheme. 相似文献
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通过列举材料,阐述了微型电子计算机的特点与功能,微机在光学计测中的作用,展望了微机在未来光学计测中的应用前景。 相似文献
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Automatic focus control: the astigmatic lens approach 总被引:1,自引:0,他引:1
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Flynn M.J. Sarkani S. Mazzuchi T.A. 《IEEE transactions on instrumentation and measurement》2009,58(10):3373-3379
In this paper, regression analysis is presented to analyze the comparative performance capability between two functionally equivalent but technologically different automatic measurement systems for acceptance testing of a unit under test (UUT). Since the pass/fail criteria of a UUT are contingent upon repeatable and reproducible accurate measurements, a methodology is presented to examine if there is a statistically significant difference between two functionally equivalent automatic measurement systems. The purpose of which is to reduce the technical risk of transportability issues that occur when a UUT is in transition from the legacy measurement system to an emerging measurement system. 相似文献