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