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1.昆明理工大学 信息工程与自动化学院,云南 昆明 650500
2.云南省绿色能源与数字电力量测及控保重点实验室,云南 昆明 650500
[ "赵振刚(1981-),男,内蒙古兴安盟人,博士,教授,硕士生导师,分别于2005年、2007年、2012年在哈尔滨工业大学获得学士、硕士、博士学位,目前主要从事光纤传感与解调技术研究、传感器应用技术与嵌入式系统研发等工作。E-mail:zhaozhengang@kust.edu.cn" ]
王思飞(1997-),男,山西临汾人,硕士研究生,2020年于山西工程技术学院获得工学学士学位,主要研究方向为光纤传感、光纤旋转连接器。E-mail:sifeiwang11@163.com
收稿日期:2022-12-16,
修回日期:2023-01-18,
纸质出版日期:2023-05-25
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赵振刚,王思飞,段绍锋等.大光斑离轴式光纤旋转连接器的耦合性能[J].光学精密工程,2023,31(10):1443-1453.
ZHAO Zhengang,WANG Sifei,DUAN Shaofeng,et al.Coupling performance of large spot off-axis fiber optic rotary joint[J].Optics and Precision Engineering,2023,31(10):1443-1453.
赵振刚,王思飞,段绍锋等.大光斑离轴式光纤旋转连接器的耦合性能[J].光学精密工程,2023,31(10):1443-1453. DOI: 10.37188/OPE.20233110.1443.
ZHAO Zhengang,WANG Sifei,DUAN Shaofeng,et al.Coupling performance of large spot off-axis fiber optic rotary joint[J].Optics and Precision Engineering,2023,31(10):1443-1453. DOI: 10.37188/OPE.20233110.1443.
针对直接对准型离轴式光纤旋转连接器中自聚焦透镜准直器出射光斑小、光纤耦合损耗大和有效对准时间短的问题,本文提出了一种由双合透镜和热扩芯光纤构成的大光斑光纤准直器。基于出射光斑在相对旋转过程中重叠面积的周期性变化规律,分析了准直器间存在径向误差和角向误差时的耦合损耗变化。根据转子圆环和出射光斑尺寸得到耦合损耗为3 dB时的理论有效对准时间。为此搭建了光纤耦合实验平台测试其耦合性能及有效对准时间。实验结果表明,光纤准直器采用的单模光纤模场直径越大耦合损耗越低,其中模场直径为28 μm时耦合损耗低至0.22 dB。在转速为60 r/min时,通过光电转化和函数拟合得到四种模场直径光纤准直器的有效对准时间。模场直径为17 μm时最大有效对准时间为7.05 ms,与理论值7.1672 ms基本一致。最后应用光纤布拉格光栅传感实现无接触式传输光信号。这种设计为大光斑离轴式光纤旋转连接器的研究及其在光纤传感领域的应用提供了理论和技术支撑。
To solve the problems of the small spot of graded-index lenses and the significant coupling loss and short effective alignment time of the current direct alignment-type off-axis fiber optic rotary joint, this study devised a large-spot fiber collimator made of a double-lens collimator and thermal expansion core fiber. Based on the periodic variation law of the overlapping area when the exit spot rotates relatively, the change in the coupling loss when there are radial and angular errors between the collimator was analyzed. The theoretical effective alignment time of the off-axis fiber optic rotary joint under a 3-dB coupling loss was calculated from the exit spot size of the rotor ring and the fiber collimator. An optical fiber coupling experimental platform was set up to test the coupling performance of the off-axis fiber optic rotary joint and measure the effective alignment time. The experimental results indicate that a larger mode field diameter (MFD) of the single-mode fiber used in the fiber collimator corresponds to a smaller coupling loss. In the test, a large MFD of 28 µm yields the minimum loss of 0.22 dB. At a speed of 60 r/min, the effective alignment times of the four MFD fiber collimators were obtained via photoelectric conversion and function fitting. For the MFD of 17 μm, the maximum effective alignment time is 7.05 ms, which is close to the theoretical value of 7.1672 ms. Finally, fiber Bragg grating sensing was applied to achieve contactless transmission of optical signals. This design provides theoretical and technical support for the large-spot off-axis fiber optic rotary joint and its application in optical fiber sensing.
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