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CCDs h questions and answers certified 2024
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CCDs h questions and answers certified 2024
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CCDsWhat does CCDs stand for ? - correct answer ✔charge-coupled devices
What are CCDs ? - correct answer ✔Silicon chips divided up into a grid of
pixels
How do CCDs work ? - correct answer ✔- photons hit a pixel
- liberates electron via photoelectric effect
- resulting in a small charge
- charge can be used and measured to create a digital signal
What does the digital signal generated do ? - correct answer ✔Describes
where the light hits and its intensity (because the charge on each pixel will
vary depending on how many photons hit it)
This allows digital image of objects to be created
What is quantum efficiency ? - correct answer ✔The percentage of incident
photons that release an electron
What is the typical quantum efficiency for a CCD ? - correct answer ✔80%
Compare the quantum efficiency of the eyes with the quantum efficiency of a
ccd - correct answer ✔- quantum efficiency of CCD = 80%
- a cell in the eye has quantum efficiency of about 1%
- so CCDs can detect far more of the light that falls on them than the eye
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