There are a large number of soft X-ray grating monochromators for high-resolution synchrotron radiation experiments in operation worldwide. At BESSY II eighteen of the monochromators currently in use are equipped with Heidenhain UHV RON905 angle encoders. Those angle encoders have successfully been in operation for decades. Today, this type of encoder has become a legacy product and repairs are getting expensive. Therefore, we have developed a new angle encoder, a mechanically compatible drop-in replacement of the RON905. A mechanically fitting prototype, based on RENISHAW absolute encoders, was tested on a high precision angle drive test bench. Fourier analysis of the encoder data allowed us to determine the precision for different angle ranges and indicates a better precision for the new angle encoder. Furthermore, we will introduce an on-line, in-situ method using electron/absorption spectroscopy to improve system accuracy with plane grating monochromators in collimated light using the newly developed encoder.

有大量用于高分辨率同步辐射的软X射线光栅单色器世界范围内运行的实验。BESSY II 目前使用的单色仪中有 18 台配备了 Heidenhain UHV RON905 角度编码器。这些角度编码器已经成功运行了几十年。如今，这种类型的编码器已成为传统产品，维修费用也越来越高。因此，我们开发了一种新型角度编码器，它是 RON905 的机械兼容替代品。基于 RENISHAW 绝对式编码器的机械装配原型在高精度角驱动测试台上进行了测试。编码器数据的傅里叶分析使我们能够确定不同角度范围的精度，并表明新角度编码器的精度更高。此外，我们将推出一个在线，