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Single-optical-waveguide Electric-field Sensor Using Pockels Film Crystal Estimation Using Simultaneous Measurement of Many Spectra Emitted from Electrical Discharge.

使用泡克尔斯薄膜晶体估计的单光波导电场传感器，同时测量放电发出的许多光谱。

基本信息

批准号：
03805022
负责人：
HIDAKA Kunihiko
金额：
$ 1.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

Optical waveguide technique is effectively utilized to make a smaller Pockels device electric field sensor. Optical waveguide electric field sensors using Pockels device which are expected to have spatial resolution of micrometers are developed.In this study, a new electric field sensor using a uni-optical-waveguide is proposed and is finally realized by means of an optimum design of a waveguide on a Pockels crystal. The main results are as follows.1)When a light beam is propagated along a x-axis in a z-cut LiNbO_3 crystal,an output of the sensor using the crystal strongly depends on ambient temperature.2)In order to improve the disadvantage mentioned at the previous item, a method of propagating a light beam along z-axis in a y-cut LiNbO_3 crystal is newly chosen. It is experimentally confirmed that the new method is useful for increasing the stability of the sensor performance.3)It is found that the working point of optical dc bias which determines the sensitivity of the sensor can be easily adjusted by controlling the length of an optical path on the sensor.4)The field sensor on a trial basis consists of a Pockels crystal having optical waveguide of 7 mum in width, 3mum in depth and 4.39mm in length, a laser diode of 1.31mum in wavelength, a membrane polarizer,an optical fiber, and a photo-detector.5)Ac and impulse voltages are applied to the sensor in order to estimate the performance of it. A good linearity and a good responsibility up to a high frequency in a lightning impulse region is confirmed experimentally.

有效利用光波导技术制作出体积更小的普克尔斯器件电场传感器。开发了使用普克尔斯器件的光波导电场传感器，预计具有微米级的空间分辨率。在本研究中，提出了一种使用单光波导的新型电场传感器，并最终通过普克尔斯晶体上波导的优化设计实现了该传感器。主要结果如下：1）当光束在z切LiNbO_3晶体中沿x轴传播时，使用该晶体的传感器的输出强烈依赖于环境温度。2）为了改善前项提到的缺点，新选择了光束在y切LiNbO_3晶体中沿z轴传播的方法。实验证实该新方法对于提高传感器性能的稳定性是有用的。3)发现决定传感器灵敏度的光直流偏压的工作点可以通过控制传感器上的光路长度来轻松调节。4)试验中的现场传感器由具有宽度为7μm、深度为3μm、厚度为4.39mm的光波导的Pockels晶体组成。长度、波长为1.31μm的激光二极管、薄膜偏振器、光纤和光电探测器。5)向传感器施加交流电压和脉冲电压以评估其性能。实验证实了雷电脉冲区域中高频的良好线性度和良好响应性。