ULTRASONIC TRANSDUCER USING PLANAR PARALLEL LANGEVIN MOUNTING PIEZOELECTRIC ELEMENT, METHOD FOR MANUFACTURING THE ULTRASONIC TRANSDUCER, GASMETER USING THE ULTRASONIC TRANSDUCER, DISTANCE MEASURING DEVICE USING THE ULTRASONIC TRANSDUCER

摘要

PURPOSE: An ultrasonic transducer using piezoelectric elements aligned in a parallel langevin type, a manufacturing method thereof, an ultrasonic conversion method using the ultrasonic transducer, an ultrasonic gas meter using the ultrasonic transducer, and an ultrasonic distance measuring device using the ultrasonic transducer are provided to oscillate piezoelectric elements in a thickness and radius modes without phase delay because the piezoelectric elements receive the same electric energy from a single signal supply channel. CONSTITUTION: An ultrasonic transducer comprises piezoelectric elements, front and rear housings(100,200), and an oscillating unit(300). The piezoelectric elements, which form a cathode on a side and an anode on the other side when applied with voltage, are coupled in grooves of the front housing and oscillate in a radius mode and a thickness mode. The oscillating unit forms oscillation of a bending mode on the front housing by the radius mode oscillation. The rear housing is coupled with the front housing to form a cylindrical cavity(140). The cavity resonant frequency according to the cavity distance(L) and the bending mode resonant frequency according to the bending mode oscillation are in accord with so that ultrasonic waves are created.