Why IR Range Finder can not measure the distances between 0-10cm?

Help & Support Robot Parts
, ,
1

Hi guys this is cem from Turkey. At university 3rd year mechanical engineering student.
I got a project report about IR Range Finders. I searched but did not find any reasonable answer. Why IR Range Finder can not measure the distances between 0-10cm?

2

Hi @cemcem and welcome to the forum
I can only guess that the morse code the IR sender transmitts has a certain length and for distances lower than 10cm, the echo/reflection would reach the receiver before the transmission has ended. Then the receiver can’t read a clear signal.

Maybe the combination of an ultrasonic range finder for low distance and IR for bigger distance would be a good match? Because sound travels much slower than light, the min. distance should be smaller.