電気光学効果を応用したプリント配線板の電位分布測定法

概要

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This paper describes a measurement method for potential distribution generated by the voltage in a PWB. In this paper, 2D potential distribution generated by the voltage applied to printed wiring is measured with high spatial resolution using electro-optic (EO) effect of a BSO single crystal, a CCD camera. In order to measure potential distribution with high resolution, it is important to control the diffusion of surface charge distribution on a insulating EO device. To realize this, the measurement method is improved by applying AC voltage whose period is shorter than the time constant of diffusion. Furthermore, to improve the sensitivity and the linearity of characteristic curve between applied AC voltage and the intensity of output light, incident light is polarized as ellipse polarization by using 1/4waveplate. Incident pulse light is synchronized with each polarity of the AC voltage, and the output light is imaged by the CCD camera. Each polaritys modulation component is synthesized by image processing. This paper describes this method, and the result that the sensitivity improved.
社団法人電気学会の論文