一种用于大坝混凝土声层析成像的水听器线阵-应用声学.PDFVIP

第 35 卷 第3 期 Vol. 35, No.3 2016 年 5 月 Journal of Applied Acoustics May, 2016 ⋄ 研究报告⋄ 一种用于大坝混凝土声层析成像的水听器线阵 温建强 朱厚卿 (中国科学院声学研究所 北京 100190) 摘要 声层析成像技术可以用图像的方式精确完整地反映层析面上检测体内部质量，是一种有效的无损检测 手段，在大坝混凝土的安全隐患检测中发挥着越来越重要的作用。本研究旨在研制成像用的接收声波的水听 器线阵，该水听器线阵由12 个水听器阵元组成，阵元间隔2 m，水听器由直径40 mm 的接收型压电圆管和前 置放大器组成。水听器在低于20 kHz 的频率范围内，自由场接收电压灵敏度为 dB，在2 MPa 静水 压力下灵敏度下降不超过2 dB。制作了2 例具有清晰接收波形、一致性和可靠性好的水听器线阵，最终为客户 在现场实地获得了高质量的层析图像。 关键词 声层析成像，水听器，水听器线阵 中图分类号: TN9TU3 文献标识码: A 文章编号: 1000-310X(2016)03-0195-04 DOI: 10.11684/j.issn.1000-310X.2016.03.002 Development of hydrophone line array for ultrasonic computed tomography in dam concrete WEN Jianqiang ZHU Houqing (Institute of Acoustics, Chinese Academy of Sciences, Beijing , China) Abstract Acoustic computed tomography (CT) can reflect the quality of tested across section in an object precisely and integrally as one of effective non-destructive test methods. In the paper, we investigated the hydrophone line array for imaging of received acoustic waves, which was composed of 12 hydrophone units, the distance between adjacent hydrophones is 2 meters. The hydrophone was composed of a diameter 40 mm receiving piezoelectric tube and a preamplifier. In the frequency range below 20 kHz, the free field receiving voltage sensitivity of hydrophone is dB. Under hydrostatic pressure of 2 MPa, the receiving voltage sensitivity falls less than 2 dB. The 2 sets of hydrophone line arrays with clear reception waveform, good consistency