中文摘要：

介绍了一种用于低温装置中超导球形转子旋转轴线位置测量的反射式强度调制（RIM）型光纤传感器。在转子端面刻划矩形漫反射图形，利用该刻线图形对反射光的强度调制来获取旋转轴线位置偏移的大小和方向。用Matlab软件进行了仿真，由输出波形分析了转子刻线精度和光斑大小对光纤传感器信号拾取的影响。仿真结果为光纤传感器的设计提供了依据，对传感器在实际应用中提高信号拾取的精度具有参考价值。

英文摘要：

A reflective intensity modulated （RIM）fiber optic sensor is introduced for the rotation axis measurement of superconducting rotor in cryogenic instrument. A diffuse reflective rectangle pattern etched on the end face of the rotor is used to modulate the reflective optical intensity on which the quantum and direction of the rotation axis deviation is determined. Precision of pattern and size of facula which influences signal-obtaining are analyzed from the output waveforms which are simulated with Matlab. The result is helpful for the design of the fiber optic sensor and gives some useful reference for improving signal-obtaining precision in the application.