ULTRASONIC WAVE DELAY LINE

摘要

PURPOSE:To obtain an ultrasonic wave delay line with small size, long delay time and high performance by allowing an ultrasonic wave irradiated from a converting element provided to an end face of a delay medium to be returned to said converting element again after the ultrasonic wave is reflected at the end face. CONSTITUTION:Only one set of a converting element 15 comprising an electrode 14 and a piezoelectric porcelain material is provided to the end face 13 of a glass-made delay medium 12 of polygon form and lead wires 16, 17 are fitted respectively to the electrode 14 and the converting element 15. The ultrasonic wave produced at the converting element 15 by the impression of an electric signal Ei is propagated along a path 18a shown in solid lines and reflected on the end face 13 on which the converting element 15 is provided and then propagated through a path 18b shown in broken lines in opposite direction as the path 18a, and returned again to the converting element 15, where the signal is converted into an electrical signal EO and extracted as a delayed signal.