基于光纤光栅传感技术的工频电场测量研究  

Study on Power Frequency Electric-Field Measurements Based on Fiber Bragg Grating Sensing Technology

作　　者：张旭辉[1,2] 王陆唐[1,2] 方捻[1,2] 

机构地区：[1]上海大学通信与信息工程学院,上海200072 [2]上海大学特种光纤与光接入网省部共建重点实验室,上海200072

出　　处：《激光与光电子学进展》2016年第2期76-81,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61377082);上海市重点学科资助课题(S30108)

摘　　要：为了解工频电磁环境和优化高压电气设备，提出一种基于布拉格光栅的全光纤电场传感器。该传感器探头是一个刻有光栅的光纤悬臂梁，并在光纤表面涂覆多层聚酰亚胺树脂。由于聚酰亚胺的介电特性，在工频电场的感应下传感器会产生动态极化现象。在时变电场力的作用下，光纤悬臂梁发生周期性摆动，从而调制光纤光栅的布拉格波长。光栅布拉格波长的最大变化量与电场强度的大小呈正比。将激光器波长设定在光栅反射谱边沿上，通过测量光栅反射光功率的大小实现对工频电场强度的测量。传感器特性的实验评估与实际工频电场的测量证明，该传感器具有很高的灵敏度，能在1-4kV电压范围内高精度地检测出高压工频电场强度，验证了该工频电场测量方法的可行性。Measurements of power frequency electric field are necessary to understand electromagnetic environments and optimize the high voltage electrical equipment. For this purpose, a novel fiber Bragg grating （FBG） based on the all-fiber power-frequency electric-field sensor is proposed. The sensor head actually is an optical fiber cantilever beam with a FBG, on which the polyimide resin as the electric field induction medium is multiple-layer coated. When the fiber cantilever beam is put into the electric field, the polyimide coating will produce the dynamic polarization effect under the induction of power frequency electric field because of the dielectric properties of polyimide coating materials, which, in turn, induces the fiber cantilever beam to vibrate periodically through the action of the time- varying electric field force. As a result, the Bragg wavelength of FBG also is modulated. The maximum shift of the Bragg wavelength is proportional to the applied electric-field strength. For demodulation of the detection signal, a laser source is used and its operating wavelength at the edge of the FBG reflective spectrum is selected. Through this operation, the change of optical power reflected from the FBG can be monitored and the power-frequency electric field strength can be measured. The experimental investigations prove that the proposed sensing method for power frequency electric field measurements is feasible and the prototype of the sensor had very high detection sensitivity and good measurement accuracy in the 1-4 kV voltage range.

关 键 词：光纤光学 工频电场 布拉格光栅 聚酰亚胺树脂 

分 类 号：TN29[电子电信—物理电子学] TN253