RAD170 Chapter 40 Matching
| What does the output phosphor do? |
| converts 1 photoelectron to 3000 light photons |
| What is minification gain? How is it calculated? |
| increased brightness from conentrating photons
(input phosphor diameter)^2/(output phosphor diameter)^2 |
| What is flux gain? How is it calculated? |
| increased brightness from photoelectron acceleration
# of output photons/# of input photons |
| What are the charge & voltage of the electrostatic focusing lenses? |
| What does the anode do? How? |
| attracts photoelectrons because of positive charge |
| What happens at the focal point? |
| Automatic Brightness Control - maintains image brightness by adjusting technique automatically |
| charge-coupled device - semiconductor that stores the charge from light photons |
| How do you calculate total brightness gain? |
| flux gain x minification gain |
| What do the electrostatic focusing lenses do? |
| focus photoelectrons and accelerate them towards the anode |
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