looduslikust kristallist ja sellele toetuvast metallteravikust koosnev algeline seade elektrivoolu tekitamiseks ja mõõtmiseks, crystal detector is an obsolete electronic component used in some radio receivers that consists of a piece of crystalline mineral which rectifies the alternating current radio signal, semiconductor diode used for the detection of a microwave signal, pooljuhtdiood, mida kasutatakse mikrolaine signaali tuvastamiseks