Interferometry is a family of techniques in which waves, usually
electromagnetic, are
superimposed in order to extract information about the waves. Interferometry is an important investigative technique in the fields of
astronomy,
fiber optics, engineering
metrology, optical metrology,
oceanography,
seismology,
spectroscopy (and its applications to
chemistry),
quantum mechanics,
nuclear and
particle physics,
plasma physics,
remote sensing,
biomolecular interactions, surface profiling,
microfluidics, mechanical stress/strain measurement, and velocimetry.