基于光学传感的交直流混合场一体化测量实现

Integrated measurement of AC and DC mixed field based on optical sensing

针对交、直流混合场测量的问题,文中基于电光晶体Pockels效应设计了旋转式光学传感元件,该设计不仅适用于测量交直流混合场,而且抑制了测量中的波动和误差。分别推导了旋转式光学电场传感器测量直流电场、交流电场以及混合场时的传感原理。为了区分不同频率下的电场强度,将Hilbert-Huang时频变换技术应用到光学电场测量,并且给出不同频率下的测量方案。在光学一体化传感器标定后,对混合场进行测量,实验数据表明,所提出的光学电场一体化测量机制适用于准确地测量交、直流混合场。

Aiming at the problem of AC/DC mixed field measurements,a rotary optical sensing element is designed based on the electro-optical crystal Pockels effect,which is not only suitable for measuring AC/DC mixed fields,but also suppresses fluctuations and errors in measurements.The principle of sensing is derived separately when measuring DC electric field,AC electric field and mixed field by rotary optical electric field sensor.In order to distinguish the electric field intensity at different frequencies,the Hilbert-Huang time-frequency conversion technique is applied to optical electric field measurements and the measurement scheme at different frequencies is given.After the calibration of the optical integrated sensor,the mixed field is measured.The experimental data shows that the proposed optical electric field integrated measurement mechanism is suitable for the accurate measurement of AC and DC mixed fields.