Would IR travel across a couple of reflectors as well as a laser would?
The 6" hole is like 4x the size of the washer, so I think 2 or 3 beams are needed to make sure the washer can't go thru undetected.
Would IR travel across a couple of reflectors as well as a laser would?
The 6" hole is like 4x the size of the washer, so I think 2 or 3 beams are needed to make sure the washer can't go thru undetected.