单词	photocathode
释义	photocathode /ˌfəʊtə(ʊ)ˈkaθəʊd / noun A cathode which emits electrons when illuminated, causing an electric current.The photocathode in the night scope that converts visible light into electrons is sensitive to both visible light and some infrared radiation.... Reflections from the target were focused on a converter unit containing a photocathode, which provided the viewer with a reconstructed image. If excitation light rejection at the photocathode were not an issue, this might simply require an increased integration time or gain setting to acquire a sufficient fluorescence signal for processing.
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