Referring now to FIGS 5A and 5B, the intensity of light received as {HEAD ~ a fiber optic source receiver pair} is moved to and from {TAIL ~ a surface} will now be described 
Referring now to FIGS 5A and 5B , the intensity of light received as { HEAD ~ a fiber optic source receiver pair } is moved to and from { TAIL ~ a surface } will now be described
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH