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... air turbulences can act as
reflectors of ultrasonic waves. I verified this today by using an
ordinary hair dryer (CONAIR CORPORATION, model 088, at 1200W). ...
Blowing air up, toward the motion detector.
d(m)
1.569
... Blowing air horizontally.... Ludwik Kowalski
across the detection area produced a lessstrong fluctuations, as below:
d(m)
1.606