ABSTRACT
Radio interferometry was born out of the rapid evolution in microwave science and technology that occurred during World War II. An interferometer combines the light collected by two or more telescopes to create a power pattern sensitive to angular size scales proportional to the projected separation (i.e., baselines) between them. Over the past ~60 years interferometric techniques initially developed for radio frequencies have steadily progressed in usage up into the THz domain. Over the next decade, THz interferometers will play a key role in disentangling the physical processes that lead to star, planet, and galaxy formation. This chapter introduces the history, technology, and data reduction techniques of interferometry.
