Before revision: An interdigital transducer (IDT) , or interdigitated transducer, is a device which consists of two interlocking comb-shaped metallic coatings (in the fashion of a zipper) which are applied to a piezoelectric substrate, such as quartz or lithium niobate.
After revision: An interdigital transducer (IDT) , or interdigitated transducer, is a device that consists of two interlocking comb-shaped arrays of metallic electrodes (in the fashion of a zipper) that are deposited on the surface of a piezoelectric substrate, such as quartz or lithium niobate.