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ice625

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[求助] 问3个关于光谱仪器的检测器问题

下面这3个题目都是关于分子光谱仪的检测器的问题,恳求这方面的专家帮忙回答一下,解释一下,中文即可,多谢~~  能回答一部分也行
1. A common photon detector, especially in an array format, is a photodiode.
a. Briefly explain how a photodiode operates. In your explanation discuss whether the diode is generally reverse- or forward-biased (and what these terms mean).
b. Sometimes the photodiode is not biased. Why would you do this? Would this increase the background in comparison to using a bias

2. For PMT, diode arrays, CID’s, or CCD’s, what determines the high and low wavelengths for these devices?

3. How do charge-coupled devices operate?
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