CMOS sensor size

Discussion in 'The Projects Forum' started by Por Qué, May 8, 2013.

  1. Por Qué

    Thread Starter New Member

    Mar 31, 2013
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    Hi all,

    I try to design a CMOS sensor (without lense ) to capture an object of size 2 cm² and I didn't find the necessary equation to calculate the size of this sensor. In this case, is the sensor has the same size as the object?

    Thank's
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    You really need to give us the part number of the sensor and possibly a link to documentation and datasheet.

    I would think that you need a lens.
     
  3. Por Qué

    Thread Starter New Member

    Mar 31, 2013
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    There is no documentation, I'm not going to use a one but I'm going to design from zero
     
  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Oh not again.. Do you understand that without a lense the cmos sensor will only see a big blur of light? You can use a single photodiode and get the same result.

    Get a piece of tracing paper and put it in front of that object you want to detect. Do you see anything apart from a shadow? Now put a lense somewhere in between, you will see a nice sharp image.
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    You can do it without a lens but you will need a Planar Fourier Capture Array (PFCA).
     
  6. Por Qué

    Thread Starter New Member

    Mar 31, 2013
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    the role of the lens is just to focus the rays of light, so place the image of the object on a small area of the sensor, so if we just design this small area is the lens is still necessary? If it has another role tell me.

    thank's
     
  7. MrChips

    Moderator

    Oct 2, 2009
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    But you have to create the image of the object and you do that with a lens or with a Fourier transformation.
     
  8. Por Qué

    Thread Starter New Member

    Mar 31, 2013
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    Does this mean that without lens don't be created ?
     
  9. MrChips

    Moderator

    Oct 2, 2009
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    Yes, you need a lens.

    Btw, look at how an optical mouse works. It's all done for you.
     
  10. Por Qué

    Thread Starter New Member

    Mar 31, 2013
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    Ok, I'll see.

    thank's a lot ^^
     
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