Archive of Medical Research

Influence of unparallel grating planes in talbot interferometry with cross gratings of different spatial frequencies in two directions.
The effects of an arbitrary small inclination between two cross gratings on the moiré fringes in Talbot interferometry are discussed when the frequencies of the grating differ in two perpendicular directions. We show that the […]

Real-time displacement measurement with a two-wavelength sinusoidal phase-modulating laser diode interferometer.
A two-wavelength interferometer that uses two separate modulating currents with different phases but the same frequencies to detect a greater degree of object displacement in real time is proposed and demonstrated. The measurement error was 57 nm, roughly 1/80 of the synthetic […]