【 中文摘要 】本发明涉及一种超声换能器的匹配层，包括依次布置的低密度声速层和高密度声速层，低密度声速层由材料A构成，高密度声速层由材料B构成，低密度声速层与压电材料表面电极相连接，高密度声速层用于裸露于空气中或连接其他器件。上述技术方案中，采用的材料为自然界可直接或间接获取的物质，通过物理淀积的方法可以精确控制厚度，克服了传统工艺在厚度研磨上的瓶颈；本发明通过厚度的精确控制，可以获得精确声阻抗值的匹配系统。此外，本发明还可以应用于各种特殊形状的换能器上，突破传统的设计局限性。

【 英文摘要 】The invention relates to a matching layer of an ultrasonic transducer. The matching layer comprises a low-density sound velocity layer and a high-density sound velocity arranged in sequence, wherein the low-density sound velocity layer is made of a material A, the high-density sound velocity layer is made of a material B, the low-density sound velocity layer is connected with a surface electrode of a piezoelectric material, and the high-density sound velocity layer is used for exposing to air or is connected with other devices. According to the technical scheme, the matching layer is made of asubstance capable of being obtained from the nature directly or indirectly, thickness of the matching layer can be controlled accurately by means of physical deposition, and the bottle neck in grinding of the thickness in the prior art is broken; as the thickness is controlled accurately, a matching system with an accurate acoustic impedance value can be obtained. Besides, the matching layer canbe applied to transducers having different special shapes, and the limit in conventional design can be broken through.

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