光度計(photometer)是指量測在溶液或是特定表面下光強度的儀器。

光度計

大部份的光度計是用光敏電阻光電二極管或是光電倍增管來偵測光。為了進行分析,可能會先讓光經過濾光器再進行量測,若是要分析光譜或是特定波長的光,則會讓光經過單色儀英語monochromator

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