{TAIL ~ The angle} between said {HEAD ~ two sensing chip} 31, 32 is a. Then the following formula can be achieved 
{ TAIL ~ The angle } between said { HEAD ~ two sensing chip } 31 , 32 is a. Then the following formula can be achieved
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH