[논문]Development of an Impedance Matching Layer in an Ultrasound Transducer with Gradient Properties

Jeong, Jihoon

doi:10.5369/jsst.2018.27.6.374

Abstract ▼ AI-Helper

The piezocomposite transducer is widely used because it is highly efficient in transforming electric energy into mechanical energy, and its frequency range is broader than that of other types of ultrasound transducers. A general piezocomposite transducer is composed of an acoustic lens, impedance ma...

The piezocomposite transducer is widely used because it is highly efficient in transforming electric energy into mechanical energy, and its frequency range is broader than that of other types of ultrasound transducers. A general piezocomposite transducer is composed of an acoustic lens, impedance matching layers, piezoelectric materials, and backing layers. When an input voltage is applied to a piezoelectric material as an active material, it generates sound waves while vibrating. At that time, an impedance matching layer helps the sound waves to propagate forward while reducing the impedance mismatch that may occur at the interface between the active material and its front material. The impedance mismatch has a negative effect on the signal of an ultrasound transducer; thus, it is important to design a matching layer to overcome the issue. In this study, an optimized feature of a matching layer with gradient properties is studied. An objective function is defined to minimize both the average and the deviation of the reflection coefficients that are functions of the frequencies. As a result, an improvement in the signal characteristics with respect to the sensitivity and bandwidth is reported.

주제어

표/그림 (3)

그림 Fig. 1. Scheme of piezocomposite with (a) no matching layer, (b) conventional single matching layer, and (c) proposed matching layer.
$Fig. 2. (a) Volume fraction of filler, and (b) Characteristic impedance along /x/L.$ 그림 Fig. 2. (a) Volume fraction of filler, and (b) Characteristic impedance along /x/L.
그림 Fig. 3. The sensitivity and bandwidth results for transducers with (a) no matching layer, (b) conventional single matching layer, and (c) proposed matching layer.

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문제 정의

In this paper, the signal characteristics of an ultrasound transducer with a matching layer composed of gradient properties are studied by a numerical analysis approach. The matching layer is described as a function of the volume fraction of the filler, and a mathematical model to optimize the layer is established using the relationships between the elastic material properties.

제안 방법

Then, the material properties at each position were calculated by the relationship between the elastic material properties. The objective function was set to minimize both the averages and deviations of the reflection coefficients at each surrounding frequency as well as the center frequency.

이론/모형

To evaluate the effect of the matching layer with gradient properties, the signal characteristics were calculated in the pulse-echo mode according to the ASTM standard guide [8]. When an impulsive voltage is applied to an ultrasound transducer, the transducer is excited and sound waves are generated.

성능/효과

2 shows that the characteristic impedance has a maximum value at the closest position to the active material (x = 0 ), and it monotonically decreases in the shape of a high-order curve. It was expected that the volume fraction of the filler decreases linearly over the thickness while it also makes the characteristic impedance decrease linearly. It seems that this curve shape comes from the matching layer thickness.
This indicates that the optimized matching layer with gradient properties improved the signal characteristics of the ultrasound transducer with respect to both the sensitivity and bandwidth. The conventional single matching layer was evaluated and showed that it has an 8.58 dB improvement, while the optimized matching layer has about an 11 dB improvement in sensitivity compared to an ultrasound transducer without a matching layer. In terms of the bandwidth (BW), the transducer with the proposed matching layer has a 67 % percent improvement compared to the transducer with the conventional single matching layer (BW₀).

참고문헌 (14)

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상세보기
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상세보기
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상세보기
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상세보기
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Development of an Impedance Matching Layer in an Ultrasound Transducer with Gradient Properties 원문보기

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