AVR-Chat

Hi
  How can I improve the distance in which the IR transmitter would work perfectly.
  I want to detect the object between 0 to 10 cm. but now I just can detect it atmost from 4 cm.
  it is worth mentioning that I'm using a pack of IR (Receiver and transmitter).
  also I wanted to know the minimum pulse width in which the counter of ATMega 16 (timer/counter 1) will trigger.
  By special thanks 
  A.Gh

       
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