A twin of Del Toro's beautiful Civil War picture, the Devil's Backbone, Pan's Labyrinth gives us tragedy through the filter of fantasy, going deep into a well of suffering and magic.
Aiming at actual instance that the frequency of electric network is waving, based on twin-T resistance-capacitance active-trap filter, a trap filter which can filter the power interference between 49.
针对电网频率波动的实际情况，基于双t型阻容有源陷波电路，设计了可以滤除频带在49。
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Based on the theoretical analysis of the principle of the FBG current measurement, the magnetostrictive effect of GMM, and the interrogation technology of twin-core fiber filter are introduced.