Large-size air coupling transducer based on photonic crystal structure

Abstract

The invention provides a large-size air coupling transducer based on a photonic crystal structure, and belongs to the field of photonic crystals. The invention discloses a large-size air coupling transducer based on a photonic crystal structure. The large-size air coupling transducer comprises a 1-3 type piezoelectric composite material layer, an acoustic impedance gradient matching layer, an upper electrode arranged between the 1-3 type piezoelectric composite material layer and the acoustic impedance gradient matching layer, and a lower electrode arranged at the bottom of the 1-3 type piezoelectric composite material layer, the 1-3 type piezoelectric composite material layer comprises a plurality of piezoelectric material columns and a polymer phase 1; the acoustic impedance gradient matching layer comprises a plurality of filling cones and a polymer phase 2. According to the large-size air coupling transducer, the phononic crystal structure is combined with the 1-3 type piezoelectric composite material and the gradient matching layer in the transducer, so that transverse vibration is better inhibited when the transducer works, vibration in the thickness direction is purer, and the transducer has better acoustic impedance matching performance with an air medium.

Description

technical field [0001] The invention belongs to the field of phonon crystals, in particular to a large-size air-coupled transducer based on a phonon crystal structure. Background technique [0002] A device that converts electrical energy, mechanical energy, or acoustic energy from one form of energy to another is called a transducer, also known as an active sensor. The transducer is the core component of the ultrasonic equipment, and its characteristic parameters determine the performance of the entire equipment. There are two main types of transducers: magnetostrictive and piezoelectric. [0003] The published Chinese patent with application number CN202010696284.8 discloses a low-frequency slotted liquid-wall coupling transducer for deep water, which belongs to the magnetostrictive type transducer. The invention discloses a low-frequency slotted liquid wall coupling transducer for deep water, which mainly includes a radiation cover plate located at the upper and lower e...

AI Technical Summary

Problems solved by technology

[0007] The lateral vibration of the air-coupled transducer in the prior art cannot be suppressed during operation, which will reduce the longitudinal radiation sound power, and the uneven distribution of the longitudinal displacement of the radiation surface will be caused by the uneven transmission of vibration energy, and the matching performance with the air medium acoustic impedance Difference

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