Quote:
Originally Posted by J_Player
Then why can't you prove this is true with a microphone?
Best wishes,
J_P
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The writer of the scientific paper must prove it. I refer my experiments. I'll re-starts it, because in the past I use simple methods, for example, don't use variable duty cycle for the IR led. Also today I have IR leds with incorporated lenses wich light travel 100 m or more.