contrast Sensor

Discussion in 'The Projects Forum' started by ravizanwar, Oct 12, 2009.

  1. ravizanwar

    Thread Starter New Member

    Oct 11, 2009
    5
    0
    Dear Friends

    I need to develop the contrast sensor for my application as goes below

    There is a white paper with chop mark square width 1mm and length 24mm i want to detect this chop mark .
    Roughly the paper becomes little transperent at this chop mark.

    Can u giuide how should and what concept whould i adapt.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Can there be a light on one side and a detector on the other side?
    Or must the light and detector be on the same side?

    Greetings,
    Bertus
     
  3. ravizanwar

    Thread Starter New Member

    Oct 11, 2009
    5
    0
    Both options are suitable for me
    1) IR detector and reciever different or
    2) Reciever and transmitter on the same side.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    Here are two examples of "slotted" opto-interupters.
    The MOC70P , with a transistor output.
    And the OPB917 , with a logic output.
    (see PDF's).
    Both can be obtained at digikey.

    Greetings,
    Bertus
     
  5. ravizanwar

    Thread Starter New Member

    Oct 11, 2009
    5
    0
    Dear

    Thanx for your prompt reply but can u suggest me the second configuration in which transmitter and reciever both are different this will be suit to my machine mechanically very well.

    Any standard ckt can be made with IR transmitter and reciever with potiometer for adjusting wavelength.
     
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