Structure borne sound sensors or {HEAD ~ ion current sensors} may also be used to detect {TAIL ~ a variable} characterizing the combustion in a combustion chamber 
used to detect
Structure borne sound sensors or { HEAD ~ ion current sensors } may also be used to detect { TAIL ~ a variable } characterizing the combustion in a combustion chamber
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH