Stacked ultrasonic transducer
An ultrasonic transducer, stacked technology, applied in the direction of fluid using vibration, etc., can solve the problems of large footprint and unfavorable practical application
Active Publication Date: 2021-02-26
BEIHANG UNIV
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Problems solved by technology
This method can synthesize unipolar ultrasonic pulses with excellent waveforms, but the overall radius of multiple single-frequency ultrasonic transducers reaches the decimeter level, making the large footprint unfavorable for practical applications
[0005] Therefore, the existing solutions for generating unipolar ultrasonic pulses to improve imaging quality have the problem of occupying a large area
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[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0034] The purpose of the present invention is to provide a stacked ultrasonic transducer designed to generate short-period monopolar ultrasonic pulses to improve the imaging effect while reducing the floor space, which can be applied to the technical field of medical ultrasonic testing equipment. In the stacked ultrasonic transducer disclosed in the present invention, each piezoelectric layer can be excited to generate ultrasonic waves with different frequenci...
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Abstract
The invention discloses a stacked ultrasonic transducer. The stacked ultrasonic transducer comprises a backing layer, a low-frequency piezoelectric layer, an insulating layer and a combined layer, allof which are sequentially arranged from bottom to top. The combined layer comprises a low-frequency matching layer, an intermediate-frequency piezoelectric layer, a high-frequency piezoelectric layerand a high-frequency matching layer. The low-frequency matching layer is arranged on the upper surface of the insulating layer. The upper surface of the low-frequency matching layer is etched downwards to the upper surface of the insulating layer to form a through cavity. An intermediate-frequency piezoelectric layer, a high-frequency piezoelectric layer and a high-frequency matching layer are sequentially arranged in the through cavity from bottom to top. According to the stacked ultrasonic transducer, each piezoelectric layer can be excited to generate ultrasonic waves with different frequencies, the ultrasonic waves generated by the piezoelectric layers are spatially stacked, and therefore single-pole ultrasonic pulses are generated, and the occupied area is reduced while the imaging quality is improved.
Description
technical field [0001] The invention relates to the technical field of medical ultrasonic testing instruments, in particular to a stacked ultrasonic transducer. Background technique [0002] Ultrasonic transducers based on piezoelectric materials have many advantages such as mature technology, low cost and real-time imaging, so they are widely used in the field of medical ultrasonic testing. The traditional PZT-based single-frequency ultrasonic transducer can generally achieve 60% of the relative bandwidth of -6dB, and the length of its transmission waveform is roughly 2-3 periods. In order to increase the bandwidth of the ultrasonic transducer and improve the ultrasonic shape, the ultrasonic transducer based on the piezoelectric composite material has been developed, its -6dB relative bandwidth is close to 100%, and the length of the transmission waveform is within 2 cycles, to a greater extent Improve the quality of ultrasound images. In order to further improve the qual...
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Login to View More IPC IPC(8): B06B1/06
CPCB06B1/06B06B2201/55B06B2201/76
Inventor 马建国徐立军蔡奕奇
Owner BEIHANG UNIV