Design a kind of ultrasonic resonator

in order to solve the problem of difficulty of echo signals identification caused by energy dispersive and fast attenuation in ultrasonic sensor long-distance ranging. Firstly

according to theory of acoustics analyze ultrasonic resonator can increase radiant efficiency by improving impedance match. Then

use Bessel function

analyze important design parameters

which affect directivity of sound source

by changing design parameters such as sound source frequency

opening area of resonator

make the directivity sharp and energy centralized. Using Matlab simulative computation and experimental show that the theoretical analysis is correct

and the effectiveness and controllability of optimum design parameters of resonator for improving the ultrasonic detecting distance.