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Binary pseudo-random gratings and arrays for calibration of the modulation transfer function of surface profilometers: recent developments

机译:用于校准表面轮廓仪的调制传递函数的二进制伪随机光栅和阵列:最新进展

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The major problem of measurement of a power spectral density (PSD) distribution of the surface heights with surface profilometers arises due to the unknown Modulation Transfer Function (MTF) of the instruments. The MTF tends to distort the PSD at higher spatial frequencies. It has been suggested [Proc. SPIE 7077-7, (2007), Opt. Eng. 47 (7), 073602-1-5 (2008)] that the instrumental MTF of a surface profiler can be precisely measured using standard test surfaces based on binary pseudo-random (BPR) patterns. In the cited work, a one dimensional (ID) realization of the suggested method based on use of BPR gratings has been demonstrated. Here, we present recent achievements made in fabricating and using two-dimensional (2D) BPR arrays that allow for a direct 2D calibration of the instrumental MTF. The 2D BPRAs were used as standard test surfaces for 2D MTF calibration of the Micromap?-570 interferometric microscope with all available objectives. The effects of fabrication imperfections on the efficiency of calibration are also discussed.
机译:使用表面轮廓仪测量表面高度的功率谱密度(PSD)分布的主要问题是由于仪器的调制传递函数(MTF)未知而引起的。 MTF倾向于在更高的空间频率下扭曲PSD。有人建议[过程。 SPIE 7077-7,(2007),选项。 47(7),073602-1-5(2008)]中指出,可以使用基于二进制伪随机(BPR)模式的标准测试表面精确测量表面轮廓仪的仪器MTF。在引用的工作中,已经证明了基于BPR光栅的建议方法的一维(ID)实现。在这里,我们介绍了在制造和使用二维(2D)BPR阵列方面取得的最新成就,这些二维BPR阵列允许对仪器MTF进行直接2D校准。 2D BPRA用作Micromap?-570干涉显微镜的2D MTF校准的标准测试表面,并具有所有可用物镜。还讨论了制造缺陷对校准效率的影响。

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