53, 020603(2016)
激光与光电子学进展
Laser & Optoelectronics Progress
©2016《中国激光》杂志社
020603-1
基于光纤光栅传感技术的工频电场测量研究
张旭辉
1,2
王陆唐
1,2
*
方 捻
1,2
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
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 1~4 kV 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。
关键词 光纤光学; 工频电场; 布拉格光栅; 聚酰亚胺树脂
中图分类号 TN29;TN253 文献标识码 A
doi: 10.3788/LOP53.020603
Study on Power Frequency Electric-Field Measurements Based on
Fiber Bragg Grating Sensing Technology
Zhang Xuhui
1,2
Wang Lutang
1,2
Fang Nian
1,2
1
School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
2
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200072, China
Abstract 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.
Key words fiber optics; power frequency electric field; fiber Bragg grating; polyimide resin
OCIS codes 060.2310; 060.2370; 350.2770
1 引 言
电场 测量 在诸多科学研究和工程技术领 域具 有重 要意义,特别 是在 电力系统、电 磁兼 容及微波技术等
领域具有广泛应用。在电力工业,工频电场测量可用于电力系统状态监测、电气设备内外电场分布测量、高
收稿日期: 2015-06-08; 收到修改稿日期: 2015-07-15; 网络出版日期: 2016-01-13
基金项目: 国家自然科学基金(61377082)、上海市重点学科资助课题(S30108)
作者简介: 张旭辉(1991—),男,硕士研究生,主要从事光纤传感方面的研究。E-mail: zhangxuhui2014@163.com
导师简介: 方 捻(1972—),女,博士,教授,主要从事光通信与光传感方面的研究。E-mail: nfang@shu.edu.cn
*通信联系人。E-mail: ltwang@mail.shu.edu.cn