A broadband ultrasonic transducer for all-dielectric detection

Abstract

The utility model relates to a kind of broadband ultrasonic transducer of full dielectric detection including shell, piezoelectric vibrator and acoustic matching layer structure. By setting acoustic impedance is respectively optimized adaptation to two kinds of acoustic impedance difference greater than one order of magnitude medium, such as the first matching area and the second matching area of liquid / solid and air, the transducer successfully overcomes the fundamental defect of traditional single matching layer transducer cannot consider different acoustic environment, to realize the efficient, integrated detection to multiple media coexistence scene, such as water-containing pore material, human gas-containing tissue, so that single transducer simultaneously has the ability of high-sensitivity receiving weak signal in low impedance medium such as air and the ability of efficient coupling strong signal in high impedance medium such as water, solid, widen effective detection range, avoid the cumbersome of replacing probe due to medium switching, improve the reliability and efficiency of detection.

Description

Technical Field

[0001] This utility model relates to the field of transducer technology, and in particular to a broadband ultrasonic transducer for all-medium detection. Background Technology

[0002] Traditional ultrasonic transducers, whether contact transducers for detecting solids and liquids or air-coupled transducers for detecting gases, typically have their acoustic matching layers optimized for the acoustic impedance of a single propagation medium, such as human tissue, water, or air, to achieve efficient acoustic energy transmission. However, in actual testing, scenarios often involve the coexistence or alternation of multiple media, such as testing composite materials with pores or covered by water films, or performing interventional testing on air-filled cavities or wound sites in the human body. Due to the significant difference in acoustic impedance between solids or liquids and air, traditional single-matching-layer transducers cannot simultaneously adapt to different media. If a transducer designed for high-impedance media is used, it cannot effectively receive weak signals from low-impedance air, while a transducer designed for air cannot withstand the strong signal impact from high-impedance media.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model discloses a broadband ultrasonic transducer for all-medium detection, which solves the problem that the huge difference in acoustic impedance between solids or liquids and air makes it impossible for traditional single-matching-layer transducers to adapt to different media simultaneously.

[0005] The technical solution adopted in this utility model is as follows: A broadband ultrasonic transducer for all-dielectric detection, characterized in that it comprises: case; A piezoelectric vibrator, disposed within the housing, is configured to transmit and receive ultrasonic waves; An acoustic matching layer structure is disposed on the housing and located in the acoustic wave radiation direction of the piezoelectric vibrator; The acoustic matching layer structure includes at least two independent matching regions, namely a first matching region and a second matching region; the acoustic impedance of the first matching region is configured to optimize acoustic energy transmission to the first medium; the acoustic impedance of the second matching region is configured to optimize acoustic energy transmission to the second medium; the acoustic impedance difference between the first medium and the second medium is greater than one order of magnitude.

[0006] A further technical solution is that the operating frequency range of the transducer is 100KHz to 10MHz.

[0007] A further technical solution is that the piezoelectric vibrator is a single-element array structure.

[0008] A further technical solution is that the piezoelectric vibrator is a multi-element array structure, which is one of a linear array, a surface array, or a phased array.

[0009] A further technical solution is that the acoustic matching layer structure is a multi-layer composite structure, wherein at least one layer includes the first matching region and the second matching region.

[0010] A further technical solution is that the shape of the first matching region and / or the second matching region is block-shaped, strip-shaped, or other geometric shape.

[0011] A further technical solution is that the broadband ultrasonic transducer for all-medium detection includes a signal processing unit, which is configured to process ultrasonic echo signals from the first matching region and the second matching region simultaneously or in a time-division manner.

[0012] A further technical solution is that the signal processing unit is also configured to perform mixing or separation processing on signals from different media.

[0013] The beneficial effects of this utility model embodiment are as follows: (I) A broadband ultrasonic transducer for all-medium detection includes a housing, a piezoelectric vibrator, and an acoustic matching layer structure. By setting the acoustic impedance to optimize and adapt to two media with an acoustic impedance difference greater than one order of magnitude, such as the first and second matching regions of liquid / solid and air, this transducer successfully overcomes the fundamental defect of traditional single-matching-layer transducers that cannot accommodate different acoustic environments. This enables efficient and integrated detection of multiple media in coexisting scenarios, such as materials with water and pores, and gas-containing tissues in the human body. It allows a single transducer to simultaneously possess the ability to receive weak signals in low-impedance media such as air with high sensitivity and the ability to efficiently couple strong signals in high-impedance media such as water and solids, thus broadening the effective detection range, avoiding the cumbersome process of changing probes due to media switching, and improving the reliability and efficiency of detection.

[0014] (ii) Furthermore, the piezoelectric vibrator is a single-element structure or a multi-element array structure, wherein the multi-element array structure is one of a linear array, a surface array, or a phased array. By providing different structural configurations of single-element and multi-element arrays, the application scenarios and functions of the transducer are significantly expanded. The single-element structure is suitable for simple and efficient detection in small areas or point regions, while the multi-element array structure can realize beam deflection and focusing of sound waves, supporting one-dimensional or two-dimensional scanning imaging. Thus, when performing full-medium detection on complex structures or large-area test objects, it has both spatial positioning and imaging capabilities, improving the accuracy and information richness of the detection. Attached Figure Description

[0015] Figure 1 This is an isometric view of the first broadband ultrasonic transducer for all-dielectric detection according to this utility model.

[0016] Figure 2 This is an isometric view of the second type of broadband ultrasonic transducer for all-dielectric detection according to this utility model.

[0017] Figure 3 This is a diagram of the air-based echo signal detected by the first type of broadband ultrasonic transducer for all-dielectric detection according to this utility model.

[0018] Figure 4 This is a diagram of the underwater echo signal of the first broadband ultrasonic transducer for all-medium detection according to this utility model.

[0019] Figure 5 This is an isometric view of the third type of broadband ultrasonic transducer for all-dielectric detection according to this utility model.

[0020] In the picture: 1. Shell; 2. First matching area; 3. Second matching area. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0022] Example: A broadband ultrasonic transducer with all-dielectric detection includes a housing, a piezoelectric vibrator, and an acoustic matching layer structure. The piezoelectric vibrator is disposed within the housing and configured to transmit and receive ultrasonic waves. The acoustic matching layer structure is disposed on the housing and located in the direction of acoustic wave radiation from the piezoelectric vibrator. The acoustic matching layer structure includes at least two independent matching regions, designated as a first matching region and a second matching region. The acoustic impedance of the first matching region is configured to optimize acoustic energy transmission to a first medium. The acoustic impedance difference between the first and second media is greater than an order of magnitude, specifically, the acoustic impedance values ​​of the two media differ by at least a factor of 10; for example, the first medium is air and the second medium is water. Exemplarily, the broadband ultrasonic transducer with all-dielectric detection includes a signal processing unit configured to simultaneously or time-divisionally process ultrasonic echo signals corresponding to the first and second matching regions. The signal processing unit is also configured to mix or separate signals from different media. Specifically, the operating frequency range of the broadband ultrasonic transducer for all-medium detection is 100 kHz to 10 MHz.

[0023] Furthermore, the piezoelectric vibrator can be a single-element structure or a multi-element array structure, where the multi-element array structure can be a linear array, a planar array, or a phased array. By providing different structural configurations for single-element and multi-element arrays, the application scenarios and functions of the transducer are significantly expanded. The single-element structure is suitable for simple and efficient detection in small areas or point regions, while the multi-element array structure can achieve beam deflection and focusing of sound waves, supporting one-dimensional or two-dimensional scanning imaging. Thus, when performing full-medium detection on complex structures or large-area test objects, it has both spatial positioning and imaging capabilities, improving the accuracy and information richness of the detection.

[0024] Furthermore, the acoustic matching layer structure is a multi-layered composite structure, wherein at least one layer includes a first matching region and a second matching region. For example, the first matching region and / or the second matching region may be block-shaped, strip-shaped, or have other geometric shapes.

[0025] Specifically, if the piezoelectric vibrator is a circular single-element structure with a cylindrical shell, and the first matching region and the second matching region are strip-shaped, the first matching region and the second matching region are composed of several first concentric rings and several second concentric rings, respectively. The several first concentric rings are coaxially nested between the several second concentric rings to form an acoustic matching layer structure.

[0026] Alternatively, if the piezoelectric vibrator is a disc-shaped single-element structure with a cylindrical shell, and the first and second matching regions are block-shaped, with a groove in the center of the first matching region and the second matching region embedded in the groove to form an acoustic matching layer structure, the test results using DPR300 Pulse / Recelver and TBS2000B DIGITAL OSCILLOSCOPE in different media are as follows: Figures 4-5 As shown.

[0027] Alternatively, if the piezoelectric vibrator is a multi-element array structure, specifically a linear array composed of several independent elements, the shell is rectangular, and the first and second matching regions are multi-layered strip-shaped. The shell has an acoustic insulation layer, which is etched with multiple parallel strip-shaped grooves. Two different matching materials are alternately filled in these grooves to form parallel strip-shaped regions. The multi-layered strip-shaped regions extend along the length of the array, and each array element is simultaneously covered by both matching regions.

[0028] In operation, this embodiment is as follows: When the broadband ultrasonic transducer for all-medium detection starts working, the external driving electrical signal first excites the piezoelectric vibrator to generate ultrasonic vibration. This vibration simultaneously acts on the first and second matching regions with different acoustic impedance characteristics contained in the acoustic matching layer structure. For a disc-shaped single-element structure, if the matching layer is a concentric ring or block nested structure, the vibration is efficiently coupled to the high acoustic impedance medium (such as water) through the first matching region, and simultaneously radiates acoustic energy to the low acoustic impedance medium (such as air) through the second matching region. For a multi-element linear array structure, the sound waves excited by each independent element act on different media in front of it simultaneously through the alternating strip matching regions below it. Subsequently, the transducer receives echo signals returned from the interfaces of different media. These signals are converted into electrical signals by the piezoelectric vibrator and transmitted to the signal processing unit. This unit performs synchronous or time-division processing on the signals from different matching regions according to the detection requirements, and selectively enhances, separates, or mixes the signals through algorithms, ultimately achieving synchronous detection and signal analysis of targets in multiple media with acoustic impedance differences greater than an order of magnitude.

[0029] In this embodiment, by setting acoustic impedance to optimize and adapt to two media with acoustic impedance differences greater than one order of magnitude, such as the first and second matching regions of liquid / solid and air, this transducer successfully overcomes the fundamental defect of traditional single-matching-layer transducers that cannot take into account different acoustic environments. This enables efficient and integrated detection of multiple media in coexisting scenarios, such as materials with water pores and gas-containing tissues in the human body. It allows a single transducer to simultaneously possess the ability to receive weak signals in low-impedance media such as air with high sensitivity and the ability to efficiently couple strong signals in high-impedance media such as water and solids, thus broadening the effective detection range, avoiding the cumbersome process of changing probes due to media switching, and improving the reliability and efficiency of detection.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A broadband ultrasonic transducer for all-dielectric detection, characterized in that, include: case; A piezoelectric vibrator, disposed within the housing, is configured to transmit and receive ultrasonic waves; An acoustic matching layer structure is disposed on the housing and located in the acoustic wave radiation direction of the piezoelectric vibrator; The acoustic matching layer structure includes at least two independent matching regions, namely a first matching region and a second matching region; the acoustic impedance of the first matching region is configured to optimize acoustic energy transmission to the first medium; the acoustic impedance of the second matching region is configured to optimize acoustic energy transmission to the second medium; the acoustic impedance difference between the first medium and the second medium is greater than one order of magnitude.

2. The broadband ultrasonic transducer for all-dielectric detection according to claim 1, characterized in that: The transducer operates in the frequency range of 100kHz to 10MHz.

3. The broadband ultrasonic transducer for all-dielectric detection according to claim 1, characterized in that: The piezoelectric vibrator has a single-element array structure.

4. The broadband ultrasonic transducer for all-dielectric detection according to claim 1, characterized in that: The piezoelectric vibrator is a multi-element array structure, which can be a linear array, a surface array, or a phased array.

5. The broadband ultrasonic transducer for all-dielectric detection according to claim 1, characterized in that: The acoustic matching layer structure is a multi-layer composite structure, wherein at least one layer includes the first matching region and the second matching region.

6. The broadband ultrasonic transducer for all-dielectric detection according to claim 1 or 5, characterized in that: The first matching region and / or the second matching region are block-shaped, strip-shaped, or other geometric shapes.

7. The broadband ultrasonic transducer for all-dielectric detection according to claim 1, characterized in that: The broadband ultrasonic transducer for all-medium detection includes a signal processing unit configured to process ultrasonic echo signals from the first matching region and the second matching region simultaneously or in a time-division manner.

8. The broadband ultrasonic transducer for all-dielectric detection according to claim 7, characterized in that: The signal processing unit is also configured to mix or separate signals from different media.

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