Sanchez-Brea Luis Miguel, Torcal-Milla Francisco Jose, Salgado-Remacha Francisco Javier, Morlanes Tomás, Jimenez-Castillo Isidoro, Bernabeu Eusebio
Universidad Complutense de Madrid, Applied Optics Complutense Group, Optics Department, Facultad de Ciencias Físicas, Ciudad Universitaria s.n., 28040, Madrid, Spain.
Appl Opt. 2010 Jun 10;49(17):3363-8. doi: 10.1364/AO.49.003363.
We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two photodetectors positioned just behind the second grating, it is possible to determine the optimal position of the light source for collimation by measuring the phase shift between the signals over the two photodetectors. We obtain mathematical expressions of the signal in terms of defocus. This allows us to perform an automated technique for collimation. In addition, a simple and accurate visual criterion for collimating a light source using a lens is proposed. Experimental results that corroborate the proposed technique are also presented.
我们提出了一种基于双光栅系统的准直技术，用于在透镜焦平面内高精度定位发射器。塔尔博特自成像被投射到第二个光栅上，产生莫尔干涉。通过位于第二个光栅后方的两个光电探测器，可以通过测量两个光电探测器上信号之间的相移来确定用于准直的光源的最佳位置。我们得到了信号关于离焦的数学表达式。这使我们能够执行一种自动准直技术。此外，还提出了一种使用透镜准直光源的简单而准确的视觉判据。还给出了证实所提技术的实验结果。
