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本文分析了平面同心环换能器近场近轴区的聚焦特性。文章导出了平面同心环在近场近轴区声场的理论计算公式,对不同的聚焦平面计算了焦平面上各点及焦点周围的任意一点的强度响应,从而看出菲涅尔区焦点附近的强度分布。文章还对均匀园盘和平面同心环在近场近轴区的强度响应进行了比较,说明了平面同心环聚焦的优越性。
In this paper, the focusing characteristics of the near-field paraxial region of a planar concentric ring transducer are analyzed. The theoretical formulas for calculating the sound field in a paraxial region of a concentric ring in a near field are deduced. The intensity response of each point on the focal plane and at any point around the focal point is calculated for different focal planes, so that the focal point near the Fresnel zone Intensity distribution. The article also compares the intensity responses of the uniform disk and the plane concentric rings in the near-field and near-field, which shows the superiority of the planar concentric ring focusing.