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Broadband air medium ultrasonic transducer with phononic crystal matching and radiation composite structure

A technology of ultrasonic transducer and composite structure, applied in the direction of fluid using vibration, etc., can solve the problems of affecting the working distance of the transducer, increasing the cost of the transducer, and limiting the wide application, so as to improve the resolution and effect range, improve acoustic matching issues, improve the effect of acoustic radiation

Active Publication Date: 2018-09-18
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For multi-layer matching plate transducers, due to the multiple reflections of sound waves and the selection of matching materials, its wide application is limited.
For piezoelectric composite transducers, although the acoustic matching of the transducer can be improved to a certain extent, the manufacturing process of the transducer is relatively complicated, which leads to an increase in the cost of the transducer
In addition, due to the addition of non-piezoelectric ceramic materials, the effective electromechanical coupling coefficient of the transducer and the radiation power of the transducer are reduced, thus affecting the working distance of the transducer

Method used

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  • Broadband air medium ultrasonic transducer with phononic crystal matching and radiation composite structure
  • Broadband air medium ultrasonic transducer with phononic crystal matching and radiation composite structure
  • Broadband air medium ultrasonic transducer with phononic crystal matching and radiation composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] see figure 1, the broadband gas-mediated ultrasonic transducer with phononic crystal matching and radiation composite structure in this embodiment is composed of a housing 1, a perforated matching plate 2, and a piezoelectric ceramic disc, wherein the housing 1 is a ring-shaped structure, It can be made of conductive metal such as titanium alloy, aluminum alloy, stainless steel or copper material. A perforated matching plate 2 is provided on the radiating end face of the housing 1, see figure 2 , the perforated matching plate 2 is a circular plate structure matching the cross section of the shell 1, and can be made of metal materials such as titanium alloy, aluminum alloy, stainless steel or copper material with high elasticity, high strength and low mechanical loss, and its diameter is 20mm. The thickness is 1 mm. In order to meet the vibration requirements of the present invention, the thickness of the perforated matching plate 2 is not greater than 1 / 10 of the diam...

Embodiment 2

[0040] The difference from the embodiment is that the piezoelectric element 3 of this embodiment is a radially polarized piezoelectric ring, the outer diameter of the piezoelectric ring is 10mm, the inner diameter is 6mm, and the thickness of the ring is 2mm, meeting the piezoelectric The diameter of the ring is smaller than the diameter of the perforated matching plate 2 and meets the following conditions: for fundamental frequency vibration, the diameter of the piezoelectric ring is less than half of the diameter of the perforated matching plate 2 . The perforated matching plate 2 of this embodiment is made of aluminum alloy with a diameter of 20 mm and a thickness of 1.2 mm. A round hole with a diameter of 1.66 mm is opened on the perforated matching plate 2 with an opening ratio of 50%.

[0041] The other components and their structures as well as the method for realizing the air medium ultrasonic transduction are the same as those in Embodiment 1.

Embodiment 3

[0043] The difference from the embodiment is that the piezoelectric element 3 of this embodiment is a piezoelectric ring with thickness polarization. The diameter of the ring is smaller than the diameter of the perforated matching plate 2 , and the following conditions are met: for second harmonic vibration, the diameter of the piezoelectric ring is less than one-third of the diameter of the perforated matching plate 2 . The perforated matching plate 2 of this embodiment is made of aluminum alloy with a diameter of 20 mm and a thickness of 1.5 mm. A circular hole with a diameter of 0.5 mm is opened on the perforated matching plate 2 with an opening ratio of 5%.

[0044] The other components and their structures and the method for realizing air-mediated ultrasonic transduction are the same as those in Embodiment 1.

[0045] The broadband gas-mediated ultrasonic transducer with phononic crystal matching and radiation composite structure of the present invention can change the re...

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Abstract

The invention relates to a broadband air medium ultrasonic transducer with a phononic crystal matching and radiation composite structure. According to the structure of the broadband air medium ultrasonic transducer, a perforated matching plate capable of changing a vibration mode and acoustic matching is arranged on the radiation end surface of a shell, the perforated matching plate is provided with a piezoelectric element capable of generating a plane radial vibration mode in a stacking mode, and the piezoelectric element is used as an excitation source to excite the perforated matching plateto generate bending vibration and to radiate ultrasonic waves. The broadband air medium ultrasonic transducer improves acoustic matching of a conventional air medium ultrasonic transducer, can increase the bandwidth, improves the acoustic radiation of the transducer, and improves the resolution and range of action of the transducer.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic transducers, and particularly designs a broadband air-mediated ultrasonic transducer with a phonon crystal matching and radiation composite structure. Background technique [0002] As we all know, in the audio frequency range, due to the low frequency of the sound wave, the size of the transducer is basically smaller than the wavelength of the sound wave, so the directivity of the transducer presents the characteristics of spherical radiation. In the ultrasonic frequency range, however, the situation is different. When the frequency increases, the wavelength of the sound wave is close to or smaller than the geometric size of the transducer, and the radiated sound field of the transducer has obvious directivity. On the other hand, when the frequency of the transducer increases, the refraction of the sound wave becomes smaller and smaller, and the sound field can be approximated as composed of m...

Claims

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Application Information

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IPC IPC(8): B06B1/06
CPCB06B1/0644B06B1/0651B06B2201/55
Inventor 林书玉徐洁
Owner SHAANXI NORMAL UNIV
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