The optical detector 7 converts the amplitude of the cantilever represented by {HEAD ~ the reflected light} into {TAIL ~ an electrical signal} 
The optical detector 7 converts the amplitude of the cantilever represented by { HEAD ~ the reflected light } into { TAIL ~ an electrical signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL