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Lecture 20: Fluoroscopy II - Cameras and Displays; TV, CCD, LCD correctly answered
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Lecture 20: Fluoroscopy II - Cameras and Displays; TV, CCD, LCD correctly answered
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Lecture 20: Fluoroscopy II - Camerasand Displays; TV, CCD, LCD
The type of camera used is determined by what? - correct answer ✔✔the photocathode layer
how does absorbing photon energy result in a decrease electric resistance locally? - correct answer
✔✔absorption of photon energy results in free conduction electrons.
If I have a bright image, is my local resistance high or low? - correct answer ✔✔Low - large amount of
electron flow.
If I have a dark image, is my local resistance high or low? - correct answer ✔✔High - not very much
electron flow.
Why do we still get some charge, even if the resistance is high? - correct answer ✔✔The capacitor still
leaks out some charge.
What happens to the capacitor during a bright image? - correct answer ✔✔The resistance is low so the
capacitor discharges its energy. The capacitor fills up again quickly after the signal has passed.
What is inertia or lag in terms of a TV camera tube? - correct answer ✔✔The "memory" that a
photoconducting material may have.
What is dark current? - correct answer ✔✔The amount of signal in the absence of illumination.
How do you control the beam coming out of an electron gun? - correct answer ✔✔Focus and control the
electron beam by using a set of electrodes.
What does it mean when the beam is scanned progressively? - correct answer ✔✔It is scanned line-by-
line.
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