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Acoustic impedance matching device and method based on piezoelectric effect

A piezoelectric effect and matching device technology, applied in the direction of impedance network, electrical components, etc., can solve the problem that it is difficult to meet the needs of transducer load impedance matching, and achieve the effect of reducing costs

Inactive Publication Date: 2016-12-07
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, it is difficult to meet the needs of various transducer load impedance matching by using the matching layer technology of the transducer for load matching.

Method used

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  • Acoustic impedance matching device and method based on piezoelectric effect
  • Acoustic impedance matching device and method based on piezoelectric effect
  • Acoustic impedance matching device and method based on piezoelectric effect

Examples

Experimental program
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Effect test

Embodiment 1

[0023] like figure 2 As shown, the acoustic impedance matching device based on the piezoelectric effect includes a backing layer, a piezoelectric transducer and a matching layer, wherein the matching layer adopts a piezoelectric ceramic matching layer structure, and the two electrode surfaces of the matching layer are connected with An electrical impedance whose value can be changed.

[0024] The above-mentioned electrical impedance can be resistance, inductance, capacitance, or any two series-parallel impedances of resistance, inductance, and capacitance, or the series-parallel impedance of the three. By changing the electrical impedance, the mechanical impedance of the piezoelectric ceramic matching layer can be changed, and then the change can be achieved. Ideal match to the load impedance of the transducer.

[0025] The structure of the piezoelectric ceramic matching layer is a thickness-polarized piezoelectric ceramic disc, and the two ends of the piezoelectric ceramic ...

Embodiment 2

[0027] like figure 2 Shown, the acoustic impedance matching method based on piezoelectric effect of the present invention, comprises the following steps:

[0028] Step 1. Under the action of an external electrical signal, the piezoelectric transducer converts electrical energy into mechanical energy by means of the piezoelectric effect to generate mechanical vibration. The mechanical vibration is divided into two parts;

[0029] Step 2. Part of the mechanical vibration propagates into the backing layer of the piezoelectric transducer and is absorbed by the backing layer; the other part of the mechanical vibration propagates into the matching layer of the piezoelectric transducer and enters the load medium through the matching layer .

[0030] Based on the piezoelectric effect of piezoelectric ceramic materials, the acoustic impedance matching of the piezoelectric transducer can be carried out through the above steps, so that the mechanical vibration generated by the piezoele...

Embodiment 3

[0032] On the basis of the above examples, if image 3 Shown, the electromechanical equivalent circuit diagram of the matching layer in the acoustic impedance matching method based on piezoelectric effect of the present invention, among the figure Z 1 ,Z 2 ,Z 3 is the equivalent circuit impedance of the piezoceramic matching layer, C 0 is the static capacitance of the piezoelectric ceramic matching layer, and n is the electromechanical conversion coefficient of the piezoelectric ceramic matching layer material. Ze is a variable electrical impedance connected to both ends of the piezoelectric ceramic matching layer, and the electrical impedance can be resistance, inductance, capacitance or any series-parallel compound between the three. Z L is the load impedance of the transducer radiation medium, that is, the load impedance of the transducer before matching, and Zim is the input mechanical impedance of the piezoelectric ceramic matching layer after matching with the piezoe...

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Abstract

The invention belongs to the technical field of ultrasonic transducers, and in particular relates to an acoustic impedance matching device and an acoustic impedance matching method based on a piezoelectric effect. The device comprises a backing layer, a piezoelectric transducer and a matching layer, wherein the matching layer is of a piezoelectric ceramic matching layer structure, an electrical impedance with a variable value is connected between two electrode planes of the matching layer, the piezoelectric ceramic matching layer structure is a piezoelectric ceramic disk polarized in thickness, and metal silver layers are plated on two ends faces of the piezoelectric ceramic disk. According to the device and method of the invention, the matching layer is made from piezoelectric ceramic material, and the piezoelectric effect is used for achieving ideal matching of any load impedance of the ultrasonic transducer, and the cost of a traditional acoustic impedance matching technology is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic transducers, and in particular relates to a piezoelectric effect-based acoustic impedance matching device and method. Background technique [0002] In all application technologies related to ultrasonic transducers, including theoretical analysis and engineering design, acoustic impedance matching technology is extremely important for the efficient transmission of transducer radiated acoustic energy. For various ultrasonic application technologies, the load of the transducer is different. From air load to solid load, the variation range of its acoustic impedance rate is huge, from hundreds of Rayleighs to tens of megaRayleighs. Therefore, in order to ensure the normal operation of the transducer under different load environments, the acoustic impedance matching of the transducer must be performed. [0003] At present, the acoustic impedance matching of the transducer mainly adopts the acoustic...

Claims

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Application Information

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IPC IPC(8): H03H9/00H03H9/17
CPCH03H9/0004H03H9/176
Inventor 林书玉
Owner SHAANXI NORMAL UNIV
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