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  •      
    DIY Digital camera
    Last update: 26th Marth 2013
    Description
    At Ribbonfarm

    Gallery:
    Images - high resolution
    Images - cityscape
    Images - in colour
    Images - indoors
    Images - MWIR
    Images - SWIR

    Making of:
    -> Start here
    Sensing
    Mechanics
    Noise handling
    To be continued.


      Camera - Start here

    Pinhole cameras

    A pinhole camera is an old concept. With a small enough hole an image can be projected on a plane opposite to it.

    Incidentally, this mechanism is quite independent of the wavelength observed.
    The optimal size of the pinhole is calculated by this formula:

    Where f is the distance from the hole to the plane, lambda is the wavelength, and d is the pinhole diameter.

    Digital back

    The image, projected from a pinhole will be quite faint. To read it off, we need a good sensor.
    Normally, that would be a job of a CCD matrix or somesuch, but that's not our way.

    Photodiodes are made in a variety of wavelengths, and are normally senitive enough for the task. With only one photodiode it have to be moved across the image plane.

    So, here is the basic design.
    Make a box:

    Make a pinhole mount in it:

    Put a cartesian robot inside:

    Put sensor on the robot:

    And you got a camera. :)

    Details follow on the next page


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