Ultrasonic wave detector
An ultrasonic and uniform technology, applied in the field of ultrasonic probes, can solve the problems of piezoelectric ultrasonic transducer resonance characteristics, limited electrode reduction space, ultrasonic signal interference, etc., to achieve high sensitivity, save materials and processes, eliminate interference and The effect of decay
Inactive Publication Date: 2009-12-30
深圳清研创业投资有限公司
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Problems solved by technology
However, as the frequency of the ultrasonic transducer increases, the thickness of the transducer substrate becomes smaller and smaller, while the thickness of the electrode is limited by the processing technology and the space for reduction is limited, so the difference between the thickness of the transducer substrate and the thickness of the electrode is getting smaller and smaller. smaller
At this time, the electrode layer will have a greater impact on the resonance characteristics of the piezoelectric ultrasonic transducer
Moreover, for high-frequency ultrasonic transducers, as the center frequency of the ultrasonic transducer increases, the wavelength of the sound wave becomes smaller and smaller, and the difference between the thickness of the electrode layer and the wavelength of the sound wave becomes smaller and smaller. Electrode layers between objects can cause some interference and attenuation of the ultrasound signal
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and preferred embodiments.
[0028] Such as figure 2 The ultrasonic probe shown is a typical embodiment, which includes a piezoelectric element 100 with a transverse field excitation structure and a backing 500 , a matching layer 400 , and an acoustic lens 300 that are common to ultrasonic probes. Wherein, the electrode layer includes a first electrode 201 and a second electrode 202 connected and arranged on the same side of the piezoelectric element 100, used to generate a transverse electric field in the piezoelectric element 100 to excite an acoustic wave in the thickness stretching vibration mode. .
[0029] Among them, the piezoelectric element 100 is made of a piezoelectric single crystal material substrate, which can be selected from lithium niobate, lithium tantalate, quartz, gallium lanthanum silicate, gallium lanthanum tantalate, gallium lanthanum niobate, lea...
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Abstract
The invention provides a ultrasonic wave detector based on horizontal field excitation, which comprises a piezo electric element (100), a first electrode (201) and a second electrode (202) positioned on the same reference surface (20) of the piezo electric element (100) and is used for generating horizontal electric field in the piezo electric element (100) so as to excite sound waves with thickness stretching vibration mode.
Description
technical field [0001] The invention relates to an ultrasonic probe. Background technique [0002] Ultrasound imaging equipment has been widely used, and it traditionally includes an ultrasound probe for converting ultrasound signals into electrical signals, a signal processing unit, an image display unit, and the like. Ultrasound probes play an important role in obtaining high-resolution images. It is generally believed that the higher the center frequency of the ultrasound probe, the higher the resolution of the ultrasound image. Most of the center frequencies of piezoelectric ultrasonic transducers used in commonly used ultrasonic imaging equipment are below 20 MHz. [0003] In order to obtain a higher resolution of ultrasonic imaging, it is an effective solution to use a high-frequency piezoelectric ultrasonic transducer with a frequency in the range of 20-200MHz. However, the piezoelectric elements in all piezoelectric ultrasonic transducers currently work in the thi...
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Inventor 张超张志甜王文炎敬刚刘岩
Owner 深圳清研创业投资有限公司