In the present invention, the sensor readout includes {HEAD ~ optics} for producing {TAIL ~ an interference fringe pattern} to impinge upon a pair of photodetectors 
for producing
In the present invention , the sensor readout includes { HEAD ~ optics } for producing { TAIL ~ an interference fringe pattern } to impinge upon a pair of photodetectors
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH