Interferometer
English Meaning
An instrument for measuring small movements, distances, or displacements by means of the interference of two beams of light; -- called also refractometer.
- Any of several optical, acoustic, or radio frequency instruments that use interference phenomena between a reference wave and an experimental wave or between two parts of an experimental wave to determine wavelengths and wave velocities, measure very small distances and thicknesses, and calculate indices of refraction.
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