What does a CCD pixel measures?

  • #1
blue_leaf77
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Main Question or Discussion Point

I have a got a problem regarding what a CCD pixel actually measures. Suppose I have a pixel of area dx dy. A plane wave of intensity I0 is impinging on the pixel making an angle α with the normal of pixel surface. The flux going into the pixel would be F = I0 dx dy cos(α). My question what is the pixel directly sensitive to, is it F or I0 cos(α)?
 

Answers and Replies

  • #2
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The I0 cos(a) is the intensity per unit area whereas your actual area is dx by dy. Right?
 
  • #3
blue_leaf77
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You can say so, but strictly speaking I0 cos(a) is the projection of intensity vector (or Poynting vector) to the normal of the pixel surface. The actual area is dx dy.
 

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