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2013年12月30日月曜日

Considering emitter's light process

   Here, I will write about the consideration to the previous experiment.

   The result was that Vector's diagonal receiver catches more light than experimental circuit's horizontal one. This means stronger reflected light comes from the front, though nothing reflects light. I wonder what the emitted light process is like.

   I completely forgot "diffuse reflection". Since maze wall is not mirror, light does not go like the picture below (sorry I'm not good at painting).


   In fact, light goes like this, I think. Here, diffuse reflection occurs and reflected light goes in all direction.


  Because of that light process, stronger reflected light comes from front than side. This explaines the experiment result. And parallel arrangement of IR emitter and receiver is the best, since receiver faces to the direction in that light comes.

2 件のコメント:

  1. Good work! and you are right for this. The surface of the wall is not perfectly flat otherwise no light will come back to receiver in this case. Theoretically, even with defuse reflection, the best way to place transmitter and receiver is not parallel. The problem is we don't know the actual angle(the angle is very small as what I suppose) and making them parallel is good enough to receiving sufficient amount of reflected IR light since the emitting angle is very small from transmitter. The perfect angle to receiver max IE light between IR LED and receiver are changing all the time when facing a wall with different distance, so I think no need to bother with this since parallel sensor pair worked just fine.

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  2. Thank you for your reading. I agree with you.
    Best IR receiver angle varies distant and mouse-angle to mazewall. It's too difficult to decide. Parallel sensor is easy and effective enough.

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