We describe a high-precision angle sensor and a new calibration system for calibrating the linearity error of an angle sensor under in situ conditions without the need for accurate reference instruments. To achieve accuracy in the nanoradian (nrad) order, we elongated the critical-angle prism to increase the sensitivity, and we added a thermal controller to the angle sensor. This served to suppress thermal drift of the Light source to improve stability. The proposed angle sensor demonstrated a stability of 3 nrad over 1 min, and the maximum repeatability error of the calibration curve determined by the in situ self-calibration method was approximately 35 nrad with a measurement range of 500 mu rad. (C) 1998 Optical Society of America. [References: 9]
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机译：我们描述了一种高精度的角度传感器和一种新的校准系统，用于在原位条件下校准角度传感器的线性误差，而无需精确的参考仪器。为了达到纳米弧度（nrad）的精度，我们拉长了临界角棱镜以提高灵敏度，并向角度传感器添加了一个热控制器。这起到了抑制光源的热漂移从而提高稳定性的作用。所提出的角度传感器在1分钟内显示出3 nrad的稳定性，并且通过原位自校准方法确定的校准曲线的最大重复性误差约为35 nrad，测量范围为500 rad rad。 （C）1998年美国眼镜学会。 [参考：9]
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