FIGS 5A and 5B illustrate a relatively uniform rate of {HEAD ~ motion} of {TAIL ~ the fiber optic pair} to and from the surface of the object being measured  
of
FIGS 5A and 5B illustrate a relatively uniform rate of { HEAD ~ motion } of { TAIL ~ the fiber optic pair } to and from the surface of the object being measured
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH