We describe a double-grating interferometer for the measurement of cylinder diameters. The unique characteristic of this interferometer is that one can freely change the period of the interference fringes by turning the grating, which permits the measurement range of the interferometer also to be changed freely according to the cylinder diameter to be measured. A clear image of the cylinder can be obtained because the aperture diaphragm blocks the beams diffracted from the edge of the cylinder. The outside and inside diameters of the M4 × 0.7 mm hand tap are measured with this double-grating interferometer.
© 2004 Optical Society of America
Yande Xu, Osami Sasaki, and Takamasa Suzuki, "Double-Grating Interferometer for Measurement of Cylinder Diameters," Appl. Opt. 43, 537-541 (2004)