interferometer ( synonym found)
Definition of interferometer:

°any of several instruments that use the interference of waves to determine wavelengths and wave velocities, determine refractive indices measure small distances, temperature changes, stresses, and many other useful measurements.
Definition of interferometer:

°any of several instruments that use the interference of waves to determine wavelengths and wave velocities, determine refractive indices measure small distances, temperature changes, stresses, and many other useful measurements.
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