Moir� Displacement Transducer for N/C Systems
R. Hariharan, Bhaskar S. Majumdar · IEEE Transactions on Instrumentation and Measurement · 1978
Noncontact method of sensing accurately the magnitude and direction of displacements is essential in systems such as the numerically controlled machines. A displacement transducer, using Moiré transmission gratings is described. The notable feature of this instrument is that it requires only gratings of small lengths, even for measurement of large displacements.