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檢偏器[1](analyzer)是由偏振片所組合而成的,通常一道自然光通過後改變其偏振態,變成橢圓或圓偏振。
如果光被偏極化,可用另一個偏極片試驗出來。[2]此一偏振片依其功能,稱為檢偏器。
在偏振光通過此檢偏器時旋轉檢偏器,可以改變透射光的功率密度,藉此判斷是否得到了所需要的偏振光。
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