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Dual-frequency ultrasonic transducer for scanning imaging

An ultrasonic transducer, scanning imaging technology, applied in the direction of fluids, piezoelectric/electrostrictive/magnetostrictive devices, electrical components, etc. using vibration, can solve problems such as resonance interference, reduce resonance interference, reduce Small approach angle blind spot, improving imaging resolution

Pending Publication Date: 2021-06-25
广州蜂鸟传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of resonance interference existing in piezoelectric micromechanical transducers in the prior art, a dual-frequency ultrasonic transducer for scanning imaging is proposed

Method used

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  • Dual-frequency ultrasonic transducer for scanning imaging
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  • Dual-frequency ultrasonic transducer for scanning imaging

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Experimental program
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Effect test

Embodiment 1

[0034] As a preferred embodiment, such as Figure 4 As shown, the large transducers 2 are distributed in a uniform array, and the small transducers 3 are installed on the midpoint of the line connecting the centers of two adjacent large transducers 2 and on the diagonal of the two large transducers 2 At the midpoint, 8×8=64 large transducers 2 distributed in a uniform array are installed on the substrate 1 , and 161 small transducers 3 are installed between the large transducers 2 .

[0035] In this embodiment, the center-to-center distance ds between the large transducers 2 is relatively large. At this time, the interference between the large transducers 2 is significantly reduced, but the reflected signal strength is insufficient, and the blind area of ​​the approach angle is relatively large. Since the center distance ds of the transducer unit is designed strictly according to ds=λ / 2, the use area of ​​the entire transducer array is seriously wasted, such as Figure 5 As s...

Embodiment 2

[0038] As a preferred embodiment, such as Figure 6 As shown, the large transducers 2 are distributed in a staggered array, and the relative positions of the large transducers 2 in two adjacent rows differ by λ / 4. The number of large transducers 2 in two adjacent columns is 8 and 7 respectively.

[0039]Since the large transducer 2 plays a decisive role in the function of the device, the small transducer 3 is complementary and optimized. For the arrangement of large transducers 2, the overall sound pressure distribution is not uniform enough. Based on this, Figure 6 exist Figure 4 On the basis of the staggered arrangement, the positions of two adjacent large transducers 2 are staggered by λ / 4, and the staggered vacancies are filled by small transducers 3 . Such dislocation design makes the sound pressure distribution everywhere more uniform under the layout of the large transducer 2, such as Figure 7 shown.

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Abstract

The invention discloses a dual-frequency ultrasonic transducer for scanning imaging, belongs to the technical field of piezoelectric micromachines, and solves the problem of resonance interference of piezoelectric micromechanical transducers in the prior art. The dual-frequency ultrasonic transducer comprises a substrate, a plurality of transducer units are mounted on the substrate, each transducer unit is composed of a plurality of large transducers and a plurality of small transducers, the diameter d1 of each large transducer is equal to lambda / 4, the diameter d2 of each small transducer is equal to lambda / 8, lambda is the wavelength with the resonant frequency of the transducer unit, the small transducers are uniformly distributed around the large transducers in an array mode, the distance between the circle centers of every two adjacent large transducers is lambda / 2, and the distance between the circle centers of every two adjacent small transducers is lambda / 4. According to the dual-frequency ultrasonic transducer, two different resonant frequencies are achieved on one substrate, resonance interference between transducers is reduced, the intensity of reflected signals is effectively improved, the blind area of an approach angle is reduced, and the imaging resolution is improved.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric micromechanics, and relates to a dual-frequency ultrasonic transducer for scanning imaging. Background technique [0002] Ultrasonic transducers have high emission intensity and receiving sensitivity, and can be used in large-scale array applications, such as linear arrays, surround arrays, two-dimensional matrix arrays, etc., and are widely used in nondestructive testing and medical imaging systems. A piezoelectric micromechanical transducer is a transducer that can convert electrical energy into acoustic energy by using the inverse piezoelectric effect of piezoelectric materials, or convert acoustic energy into electrical energy by using the piezoelectric effect, corresponding to its transmitting and receiving states The function of ultrasonic scanning imaging can be completed by processing the reflection signal through an external circuit and signal processing algorithm. In practical sce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B06B1/06H01L41/083H10N30/50
CPCB06B1/06H10N30/50
Inventor 秦风李慧
Owner 广州蜂鸟传感科技有限公司