摘要
针对井下前视成像问题,设计了一种井下前视成像超声阵列换能器。换能器由平面圆环形阵列与凹面聚焦声学透镜组合而成,通过相控阵发射聚焦声束并控制声束旋转扫描,在阵元数相对较少的前提下实现了井孔前视方向的声束覆盖探测以及图像获取。推导了换能器的空间声场,仿真分析了换能器的声场特性及相关参数对换能器聚焦性能的影响,并据此确定了换能器的各项参数并试制出井下前视成像换能器。实验测试换能器的声场并进行了初步的成像实验,结果表明,换能器的实测声场与仿真结果基本符合,所得前视图像可以反映障碍物的形状和位置信息。
In order to realize downhole forward-looking imaging,an ultrasonic phased array transducer for downhole forward-looking imaging has been designed.The transducer consists of a planar circular array combined with a concave focusing acoustic lens.By using phased array emitting focused acoustic beams and controlling these beams for rotational scanning,it achieves acoustic beam coverage and image acquisition in the forward direction of the borehole under conditions of relatively few array elements.This paper derives the spatial acoustic field of the transducer and simulates the acoustic field characteristics and the effects of related parameters on the focusing performance of the transducer.Based on theoretical derivation and simulation,various parameters of the transducer were determined,and a forward-looking imaging transducer was fabricated.Experimental tests were conducted on the acoustic field of the transducer,and preliminary imaging experiments were carried out.The experimental results show that the measured acoustic field of the transducer is basically consistent with the simulation results,and the obtained forward images can show the shape and position of obstacles.
作者
孟卫东
阎守国
黄娟
张碧星
MENG Weidong;YAN Shouguo;HUANG Juan;ZHANG Bixing(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)
出处
《声学学报》
2025年第1期138-148,共11页
Acta Acustica
基金
国家自然科学基金项目(12374453)
中国海油测井与定向钻井重点实验室2022年自主前瞻基础研究课题(YJB22YF004)资助。
关键词
超声阵列换能器
相控阵列
声透镜
聚焦声场
前视成像
Ultrasonic array transducer
Phase-controlled array
Acoustic lens
Focused sound field
Forward imaging
