As illustrated, {HEAD ~ the infrared motion detector} includes detector means 1 for receiving the radiation and for forming a signal from {TAIL ~ a characteristic change} of the detected infrared radiation 
As illustrated , { HEAD ~ the infrared motion detector } includes detector means 1 for receiving the radiation and for forming a signal from { TAIL ~ a characteristic change } of the detected infrared radiation
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH