基于激光自混合干涉的磁场测量方法研究
Research on magnetic field measurement method based on laser self-mixing interference
赵岩 1李康达 1林茂华 1孙文强 1张正阳1
作者信息
- 1. 天津理工大学电气工程与自动化学院,天津市复杂系统控制理论及应用重点实验室,天津 300384
- 折叠
摘要
针对光纤磁流体磁场传感器易受环境干扰及磁流体薄膜制作工艺复杂的问题,激光自混合干涉具有抗干扰能力强、稳定性好的特点,提出一种基于空间光的水平偏振激光自混合干涉的磁场测量方法,在外部磁场的作用下,水平偏振自混合干涉信号幅值发生变化,在一定范围内,磁场与信号幅值变化成正比,通过用施加磁场前后信号幅值的均值比与磁场的变化关系实现对磁场的传感检测.经过实验验证,信号的幅值在1％浓度的磁流体中衰减明显,薄膜厚度为0.5 mm,减小了薄膜的制作难度.在实验结果中对5.02 mt到19.112 mt磁场强度范围内的均值比进行线性拟合,相对误差最小为0.17％.
Abstract
In view of the problems that optical fiber MHD magnetic field sensor is susceptible to environmental in-terference and the MHD film production process is complex,laser self-mixing interference has the characteristics of strong anti-interference ability and good stability,a magnetic field measurement method based on spatial light horizon-tal polarization laser self-mixing interference is proposed.In a certain range,the magnetic field is proportional to the change of the signal amplitude,and the magnetic field is detected by using the mean ratio of the signal amplitude be-fore and after the magnetic field is applied.The experimental results show that the amplitude of signal attenuates obvi-ously in MHD with 1％concentration,and the film thickness is 0.5 mm,which reduces the difficulty of making the film.In the experimental results,the mean ratio of 5.02 mt to 19.112 mt magnetic field intensity was linearly fitted,and the relative error was at least 0.17％.
关键词
自混合干涉/磁场测量/水平偏振/磁流体薄膜Key words
self-mixing interference/magnetic field measurement/horizontal polarization/MHD thin film引用本文复制引用
基金项目
国家自然科学基金(61803281)
天津市自然科学基金(18JCQNJC75500)
天津市教委科研项目(2017KJ253)
出版年
2024
NETL
NSTL
万方数据