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Photodiode Amplifiers
What does a Pulse Amplifier Discriminator do?
I'm making a photometer. Light hits a photodiode, which generates current. The idea here is to count the incident photons. A PAD is used for single photon counting, but what exactly does it do?
No, it's a pulse amplifier discriminator. A pulse amplitude discriminator is something completely different.
It is a pulse amplitude discriminator. It only allows pulses through that are between two preset amplitudes. So a very small pulse probably came from electronic noise rather than a photon, and is not allowed through. A very large pulse is probably from interference, so it is not allowed through either. Medium sized pulses are probably from photons, so only these get counted.
It is pushing it to use a photodiode for this task. Photomultipliers are preferred.
I checked. It combines the preamplifier, linear amplifier and lower level discriminator in one box. In other words, it detects pulses above a pre-set amplitude. The unit has to be very close to the PM tube, and if you are using a photodiode you have to provide the bias somehow.
You are on your own for an upper level discriminator.
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DescriptionLight photons impinging upon a semiconductor material in the vicinity of a P-N junction release conduction carriers to produce current flow through the photodiode effect. Photodiode amplifiers convert this current to a voltage in a relationship that remains linear as long as the amplifier eliminates signal voltage swing from the photodiode... |
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