Laser intensity modulation method (LIMM): A technique for determination of spatial distributions of polarization and space charge in polymer electrets
Laser intensity modulation method (LIMM): A technique for determination of spatial distributions of polarization and space charge in polymer electrets
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DOI：
10.1063/1.336352
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发表时间：
1985-09
期刊：
影响因子：
--
通讯作者：
S. Lang;D. Das-Gupta
中科院分区：
文献类型：
--
作者：
S. Lang;D. Das-Gupta
提出了一种测量极性聚合物驻极体中复合极化和空间电荷空间分布的新方法。这项技术被称为激光强度调制方法（LIMM），它是基于测量驻极体在200至2500赫兹的频率范围内进行强度调制的激光束加热时产生的热释电电流。采用一种特殊的分析技术将电流频率测量值转化为空间分布。通过仿真数据的计算，说明了LIMM的优点和局限性。给出了实验室取样的实验结果。
A new method for measuring the spatial distribution of combined polarization and space charge in poled polymer electrets has been developed. The technique, called the Laser Intensity Modulation Method (LIMM), is based upon measurement o-f the pyroelectric current generated by the electret when it is heated with a laser beam which is intensity-modulated at frequencies varying from 200 to 2500 Hz. A special analytical technique is used to trans-form the current-frequency measurements to spatial distributions. The advantages and limitations of LIMM are illustrated by means of calculations based upon simulated data. Experimental results on laboratory-poled samples are presented.