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一种基于光栅的滚转角测量新方法 总被引:1,自引:0,他引:1
提出了一种利用一维平面透射光栅作为敏感器件的滚转角测量新方法。利用聚焦透镜及光电位置探测器组成接收测量单元, 避免了直线度误差带来的影响; 利用光栅的±1级衍射光束构成双光路差动测量, 基本避免了俯仰、偏摆角的串扰, 实现了误差分离, 同时增强了抗干扰能力。通过详细的理论分析, 论证了方案的可行性, 并在此基础上通过实验得到了定标曲线, 其线性相关度为1, 滚转角测量的角度分辨率可以达到0.6″。测量方法简单灵活, 仅需更换不同线数的光栅便可满足不同测量精度的要求。 相似文献
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本文以基于 Buchadhl 象差系数得到的点列图为目标函数,只需追迹少许光线就可得到近似点列图,大大减少了计算量;同时采用了目标函数对结构参数偏导数解析求导原理并应用于光学自动设计,这样得到的解析偏导数不仅不存在原理误差,同时极大地减少了求得所需的时间;最后给出了使用 DFP-BFGS 优化方法设计一个双高斯物镜的实例. 相似文献
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A new high-performance laser scanning system is designed. In this system, a scanning arm consisting of a pentagonal prism and a scanning object lens is used to replace the traditional Fθ lens, and a circular imaging plate transmission mechanism is specially designed in order to meet the requirement of the scanning arm. At the same time, the stimulation fluorescence can be obtained by the scanning arm. Some main factors that influence the spatial resolution and the performance of the laser scanner system are analyzed, and the analysis results are presented, which is helpful for further optimization design of the system. Experimental results indicate that the images obtained by the system have good visual effects and can meet the requirements of industrial inspection. 相似文献
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以复合函数的微分法则为基础,提出了光学设计中目标函数对结构参数一阶和二阶偏导数解析求导的方法,给出了相应的推导过程和计算实例。 相似文献
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We develop and build a new type of inspection car.A beam that is not rigidly connected to the train axle boxes and can absorb the vibration and impact caused by the high speed train is used,and a laser-camera measurement system based on the machine vision method is adopted.This method projects structural light onto the track and measures gauge and longitudinal irregularity.The measurement principle and model are discussed.Through numerous practical experiments,the rebuilt car is found to considerably eliminate the measurement errors caused by vibration and impact,thereby increasing measurement stability under high speeds.This new kind of inspection cars have been used in several Chinese administration bureaus. 相似文献
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五角棱镜制造角差及抖动对其转向角的影响 总被引:1,自引:0,他引:1
从五角棱镜的原理和特性出发,分析了在理想条件下五角棱镜的转向角不受入射角的影响,详细讨论由于五角棱镜加工角差和相对入射光束抖动对其转向角的影响,给出了相应的精确表达式。其中对于入射光在垂直于入射面抖动的情况,由于不能简单从二维几何光学关系分析,而采用了矢量分析方法,得出:当角差δβ=δθ时,入射角抖动对转向角偏差的影响可以忽略,而转向角偏差与制造角差几乎成线性关系。为五角棱镜用于计量测试误差分析提供了理论依据。结论对五角棱镜的制造也有很大理论指导的意义。 相似文献
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