In order to improve measurement precision of time grating displacement sensor

a method is introduced which not by increasing frequency of clock

vernier caliper subdivision method. Using vernier caliper measure method for reference

which subdivide clock of time grating again

high resolution and high precision time measurement are achieved. Meanwhile

avoid complicated electronics subdivision. To verify validity of this method

a set of experimental platform is set up. Experiment demonstrates that peak value of measurement error is ± 1. 4″

when the time grating measurement is worked under 41. 7 ps high resolution clock interpolation pulse

higher precision measurement of time grating is achieved.