基于圆弧阵的多极子声波测井辐射器

Multipole acoustic logging transmitter structurized by annular array

设计了一种具有复合功能的环形结构的多极子声波测井辐射器。基本方法是由多个作弯曲振动的压电振子构成了圆弧阵辐射器,通过改变圆弧阵上压电振子的组合方式和振动相位,使该圆弧阵成为单极子源、偶极子源和四极子声源。在实验室的消声水池内对多极子声波测井辐射器的单极子、偶极子和四极子声源的频率特征和指向性等参数进行了测量。实验结果表明,在不同组合和激励条件下,圆弧阵具有声波测井的单极子、偶极子和四极子声源的辐射特征。采用该声波辐射器可以缩短多极子声波测井仪器的长度、简化多极子声波测井波形处理步骤和提高声波测井质量。

A novel kind of multi-functlon acoustic transmitter with annular structure that can be used in acoustic logging was designed. The acoustic transmitter composed of many flexural vibrators and arranged in an annulus is of monopole, dipole and quadrupole .source functions by controlling the vibrating phase of each vibrator. Directivities of the transmitter in different acoustic frequency were investigated by experiment in a free-field pool. The results show that the annular array in different combination and excitation condition has radiation characteristics of monopole, dipole and quadrupole of acoustic logging. Employing this kind of transmitter can shorten the length of acoustic logging tool, simplify the processing of muhipole acoustic logging data and improve logging quality.