{HEAD ~ The output signal} from this optical detector 7 is sent via {TAIL ~ the preamplifier} to the RMS DC 18, which converts the amplitude into a dc voltage 
is sent via
{ HEAD ~ The output signal } from this optical detector 7 is sent via { TAIL ~ the preamplifier } to the RMS DC 18 , which converts the amplitude into a dc voltage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH