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Date: 26-5-2016
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Date: 12-8-2020
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Date: 8-9-2020
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Photoelectric devices: Spectral sensitivity
A range of photocathodes is available covering the spectrum from the ultraviolet to about 10 000 A˚ . The cut-off in the ultraviolet is controlled by the glass envelope of the cell and, by using a quartz window above the cathode, the ultraviolet sensitivity can be extended. The various spectral responses are designated by a number (e.g. S–1) and three such sensitivity curves are depicted in figure 1.
Figure 1. The spectral sensitivity of various photocathodes.
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دراسة: عدم ترتيب الغرفة قد يدل على مشاكل نفسية
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علماء: تغير المناخ تسبب في ارتفاع الحرارة خلال موسم الحج
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جهود مكثفة وطباعة عشرات الآلاف من المنشورات .. استعدادات العتبة العلوية المقدسة لعيد الغدير الأغر
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