Acoustic Matching Member with Patterned Impedance for Ultrasound Transmission
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Solution Overview
Problem
Conventional impedance matching techniques for ultrasound are limited in their ability to penetrate barriers, resulting in significant energy loss due to impedance mismatches between different media.
Innovation Solution
An acoustic matching member with a simple structure and easy manufacturing process, featuring a matching pattern that determines impedance and phase changes, allowing for 90% or more of ultrasound to be transmitted through barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional impedance matching technique is used, then ultrasound transmittance is improved, but it cannot penetrate barriers effectively
Solution Approach 1:
The matching layer is segmented into multiple units with different impedance values arranged in a specific pattern. This segmentation allows the layer to progressively match impedance across the barrier interface, enabling both energy transmission and barrier penetration. The patterned arrangement of high and low impedance regions creates effective acoustic pathways through the barrier.
Solution Approach 2:
The matching layer uses composite material structure combining regions of different acoustic impedances. This composite approach allows the layer to simultaneously provide impedance matching for energy transmission and acoustic properties for barrier penetration, resolving the contradiction between reducing energy loss and maintaining penetration capability.
2Ease of manufacture
If simple structure and easy manufacturing are implemented, then manufacturing complexity is reduced, but barrier penetration performance may be compromised
Solution Approach 1:
The matching layer is divided into discrete units that can be manufactured separately and then assembled in a patterned arrangement. This segmentation enables simple manufacturing of individual components while achieving complex acoustic performance when assembled, resolving the contradiction between manufacturing ease and penetration performance.
Solution Approach 2:
The patterned matching layer acts as an intermediary structure between the simple manufacturing process and the complex barrier penetration requirement. The layered pattern provides a transitional acoustic impedance profile that bridges the gap between easy-to-manufacture simple layers and the performance needed for barrier penetration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The acoustic matching member effectively minimizes energy loss by ensuring high transmittance of ultrasound through barriers, enabling efficient ultrasound propagation to targets despite impedance mismatches.
Implementation Method 1
When ultrasound propagate from a first medium to another second medium, a reflection phenomenon inevitably occurs at a boundary between the first medium and the second medium. This is due to an impedance mismatch between the two media. Conventionally, an impedance matching technique has been used to increase transmittance of ultrasound at interface between different media.
Implementation Method 2
The impedance and the phase change matching conditions are based on the destructive interference conditions of reflected waves generated by multiple internal reflections occurring inside the acoustic matching member and the barrier.
Implementation Method 3
The impedance and the phase change matching conditions are based on the destructive interference conditions of reflected waves generated by multiple internal reflections occurring inside the acoustic matching member and the barrier.
Data Source
AI summary
Disclosed is an acoustic matching member comprising matching pattern to determine an impedance of the acoustic matching member and a phase change of the acoustic matching member defined as the product of a wave number and thickness of the acoustic matching member, which satisfies the impedance and the phase change matching conditions so that 90% or more of an ultrasound may be transmitted through a barrier located between an incident medium and a target medium.