In particular, the invention provides a simple but accurate technique for estimating the average overall deformation of a structural member, without using optical devices and without {TAIL ~ a large number} of {HEAD ~ sensors} 
In particular , the invention provides a simple but accurate technique for estimating the average overall deformation of a structural member , without using optical devices and without { TAIL ~ a large number } of { HEAD ~ sensors }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD