在液氮中克尔常数频率依赖性

K. Imai, A. Kanematsu, M. Nawata, M. Zahn
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引用次数: 5

摘要

利用灵敏的交流调制方法在液氮中进行了克尔电光场测绘测量。在电压高达70 kV时,具有7 mm间隙的平行不锈钢电极之间的稳态电场基本上是均匀的,没有明显的空间电荷畸变。液氮的克尔常数B在交流调制频率1 ~ 20khz范围内不变,在20khz以上增大。B随调制频率的变化与所使用的锁相放大器的频幅增益特性相吻合,因此B与本研究范围内的交流调制频率无关。B随着温度T的升高而单调减小,从而使液氮密度rho减小,使B与rho /T线性相关。由简单物理模型得到的B-(rho /T)特性斜率计算得出,液氮的极化各向异性为8.3*10/sup -41/ F-m/sup 2/。
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Kerr constant frequency dependence in liquid nitrogen
Kerr electro-optic field mapping measurements using the sensitive AC modulation method were made in liquid nitrogen. The steady-state electric fields between parallel stainless steel electrodes that had a gap of 7 mm are shown to be essentially uniform for voltages up to 70 kV with no significant space charge distortion. The Kerr constant B of liquid nitrogen is constant over the AC modulation frequency range of 1-20 kHz, while increasing above 20 kHz. This change of B with the modulation frequency coincides with the frequency-amplitude gain characteristic of the lock-in amplifier used, so that B is independent of the AC modulation frequency within the range of this study. B monotonically decreases with increasing temperature, T, thus decreasing liquid nitrogen density, rho , so that B is related linearly to rho /T. The polarizability anisotropy of liquid nitrogen is evaluated to be 8.3*10/sup -41/ F-m/sup 2/ from the slope of the B-( rho /T) characteristic, obtained from a simple physical model.<>
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