The sensor includes a light source transmitter and a receiver sensitive to the radiation emitted by {HEAD ~ the transmitter} to be located on {TAIL ~ a diametrically opposite surface area portion} of the body protruding part 
to be located on
The sensor includes a light source transmitter and a receiver sensitive to the radiation emitted by { HEAD ~ the transmitter } to be located on { TAIL ~ a diametrically opposite surface area portion } of the body protruding part
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH