Alternative way to measure distance Instead of generating a short pulse and measuring round trip propagation time(also requires return pulse be detected), you can measure phase ditterence between outgoing and incoming continuous wave Schematic shown on next page Basic method used by interferometer 02/25/02 12.540Lec0602/25/02 12.540 Lec 06 9 Alternative way to measure distance • Instead of generating a short pulse and measuring round trip propagation time (also requires return pulse be detected), you can measure phase difference between outgoing and incoming continuous wave • Schematic shown on next page • Basic method used by interferometer