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A new adaptive light beam focusing principle for scanning light stimulation systems

机译:用于扫描光刺激系统的新的自适应光束聚焦原理

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摘要

In this article a novel principle to achieve optimal focusing conditions or rather the smallest possible beam diameter for scanning light stimulation systems is presented. It is based on the following methodology: First, a reference point on a camera sensor is introduced where optimal focusing conditions are adjusted and the distance between the light focusing optic and the reference point is determined using a laser displacement sensor. In a second step, this displacement sensor is used to map the topography of the sample under investigation. Finally, the actual measurement is conducted, using optimal focusing conditions in each measurement point at the sample surface, that are determined by the height difference between camera sensor and the sample topography. This principle is independent of the measurement values, the optical or electrical properties of the sample, the used light source, or the selected wavelength. Furthermore, the samples can be tilted, rough, bent, or of different surface materials. In the following the principle is implemented using an optical beam induced current system, but basically it can be applied to any other scanning light stimulation system. Measurements to demonstrate its operation are shown, using a polycrystalline silicon solar cell.
机译:在本文中,提出了一种新颖的原理,可以实现最佳的聚焦条件,或者为扫描光刺激系统提供尽可能小的光束直径。它基于以下方法:首先,将相机传感器上的参考点引入,在其中调整最佳聚焦条件,并使用激光位移传感器确定聚光光学元件和参考点之间的距离。在第二步中,该位移传感器用于绘制所研究样品的形貌。最后,使用样品表面上每个测量点的最佳聚焦条件进行实际测量,该聚焦条件由相机传感器和样品形貌之间的高度差确定。该原理与测量值,样品的光学或电学性质,使用的光源或选定的波长无关。此外,样品可以倾斜,粗糙,弯曲或具有不同的表面材料。在下文中,使用光束感应电流系统来实现该原理,但是基本上可以将其应用于任何其他扫描光刺激系统。显示了使用多晶硅太阳能电池进行测量以证明其运行的方法。

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