Exam (elaborations)
Lecture 20: Fluoroscopy II - Cameras and Displays; TV, CCD, LCD correctly answered
- Course
- Institution
Lecture 20: Fluoroscopy II - Cameras and Displays; TV, CCD, LCD correctly answered
[Show more]
Content preview
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.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Sanchy062. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78121 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
