We present a simple autocollimator with sub-microradian sensitivity. To demonstrate the capabilities of our autocollimator, we study the simple harmonic motion of a cantilever beam and apply an external force to affect the cantilever's resonant frequency in the context of dynamic force microscopy. Our setup is ideal for the advanced undergraduate instructional laboratory and allows a variety of high-precision, tabletop experiments.

中文翻译：

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具有亚微弧度灵敏度的自准直仪

我们提出了一种具有亚微弧度灵敏度的简单自准直仪。为了展示我们的自准直仪的功能，我们研究了悬臂梁的简谐运动，并在动态力显微镜的背景下施加外力来影响悬臂的共振频率。我们的设置非常适合高级本科教学实验室，并允许进行各种高精度的桌面实验。