For carring out the measuring, {HEAD ~ a transmitting fiber optic} and {TAIL ~ a receiving fiber optic} in the endoscope are guided separately to respective separate optic modules at the front end of the endoscope 
For carring out the measuring , { HEAD ~ a transmitting fiber optic } and { TAIL ~ a receiving fiber optic } in the endoscope are guided separately to respective separate optic modules at the front end of the endoscope
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH