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m229 said:dear Basil;
fast movement of body. and when the peron is running.
thanks
m229
m229 said:i don't want this type of sensors.
for example suppose that we have a straight line and when a body cut this line then we detect him/her. for example in running race, when every body pass the end line we recognize and we have the time of passing. and it is important for me that this beam is very thin.
because if the beam is not thin then the time of passing the body or other thing is not exact.
sincerely u'rs
m229