权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Trial manufacture of electric field measuring system based on Kerr effect in gases

基于克尔效应的气体电场测量系统的试制

基本信息

批准号：
13555078
负责人：
HIDAKA Kunihiko
金额：
$ 8.26万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555078/
关键词：
Gas Kerr effect Electric field Measurement Noncontact Electro-optic effect Phase modulation Atmospheric air 空気

项目摘要

A non-contact measurement of electric field is proposed based on Kerr effect in gas. With the Kerr sensing technique, the electric field can be measured without causing any field disturbance, Kerr constants of gases are, however, very small compared with those of liquids and this ideal technique has not been applied to the electric field measurement in gas.In this study, a system is developed for high sensitive measurement of the small phase retardation caused by the Kerr electro-optic effect of gas. An optical phase modulation technique is effectively adopted to improve the sensitivity of the system.The light beam emitting from a stabilized He-Ne laser (632.8 nm in wavelength, 3 mW in power) passes through a photoelastic modulator (PEM) and is put into a test vessel or open air depending on the measured gaseous material. The test vessel is made of stainless steel with glass (BK7) windows and filled with material gas. A pair of aluminum plane electrodes with length 1.3 m, width 160 mm and 20 mm gap is placed in parallel with each other in the vessel. A pair of reflection mirrors is set outside of the glass windows. The laser light goes back and forth 5 times in the middle space between the electrodes. The cross section of light bundle is approximately 50 x 4 mm rectangular.When the laser light passes through the PEM, the phase shift between two orthogonal components of the light is modulated with an external high frequency (50 kHz) driver. The phase offset based on the additional birefringence, which generates a noise, is compensated by the Soleil-Babinet compensator.With this optical system, (I) dc stressed uniform electric fields in sulphur hexafluoride, nitrogen, and carbon dioxide gases at the pressure of 0.2 to 0.5 Mpa and (ii) ac stressed uniform electric fields in atmospheric air are measured. The optical system is successfully used to obtain the Kerr constant of atmospheric air. 1.3xlO^<-15>[m/V^2].

基于气体中的克尔效应，提出了一种非接触式电场测量方法。利用克尔传感技术可以在不引起任何场干扰的情况下测量电场，但是气体的克尔常数与液体的克尔常数相比很小，这一理想的技术还没有应用于气体中的电场测量。该系统采用光相位调制技术，由波长632.8nm、功率3 mW的稳定He-Ne激光器发出的光束，通过光弹调制器（PEM），根据被测气体物质的不同，分别置于测试容器或室外，有效地提高了系统的灵敏度。试验容器由不锈钢制成，带有玻璃（BK 7）窗口，并充满材料气体。将一对长1.3m、宽160 mm、间隙20 mm的铝平面电极彼此平行地放置在容器中。玻璃窗外设有一对反光镜。激光在电极之间的中间空间来回5次。光束的横截面约为50 x 4 mm的矩形。当激光通过PEM时，光的两个正交分量之间的相移由外部高频（50 kHz）驱动器调制。利用Soleil-Babinet补偿器补偿了产生噪声的附加双折射引起的相位偏移，测量了0.2 ~ 0.5MPa压力下六氟化硫、氮气和二氧化碳气体中的直流应力均匀电场和大气中的交流应力均匀电场。该光学系统已成功地用于测量大气克尔常数。1.3x10^2 <-15>[m/V^2]。