Development of air-coupled ultrasonic transducer for material surface defect detection
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摘要: 为解决在材料表面缺陷检测用空气耦合超声换能器的研制中，压电陶瓷材料与空气之间存在的巨大阻抗失配问题，将空心玻璃微珠和环氧树脂进行复合，制备出密度为550 kg·m-3，声速为2 300 m·s-1，声阻抗为1.3 MRayl，声衰减系数（2.25 MHz下）为344 dB·m-1的低声阻抗、低衰减的匹配层材料，并采用1/4波长匹配原理进行换能器设计。在此基础上制作空气耦合超声换能器，对其进行导纳谱测试和回波信号测试分析。结果表明，研制出的空气耦合超声换能器中心频率为204 kHz，-6 dB相对带宽为21.0%，具有较好的灵敏度和带宽。Abstract: In order to solve the huge impedance mismatch problem between the piezoelectric ceramic material and the air in the development of air-coupled ultrasonic transducer for material surface defect detection, this paper selected hollow glass beads and epoxy resin for compounding. A type of low acoustic impedance and low attenuation matching layer material with its density of 550 kg·m-3, sound velocity of 2 300 m·s-1, acoustic impedance of 1.3 MRayl, and acoustic attenuation coefficient of 344 dB·m-1 at 2. 25 MHz was prepared, and the quarter-wavelength matching principle was used for transducer design. On this basis, an air-coupled ultrasonic transducer was fabricated, and the admittance spectrum test and echo signal test analysis were performed on it. The results show that so developed air-coupled transducer has a center frequency of 204 kHz and relative bandwidth of -6 dB is 21.0% with better sensitivity and bandwidth.
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[1] 卞加聪, 胡文祥, 周八妹.多匹配层空气耦合压电超声换能器[J].应用声学, 2018, 37(1):96-100. [2] 崔治, 彭楚武.空气耦合式超声检测在航空无损检测中的应用[J].无损检测, 2010, 32(6):463-466. [3] 宋逵, 代海波.空气耦合式超声波无损检测技术的发展[J].城市建设理论研究(电子版), 2013(17):1-5. [4] 李骥, 张旻, BOGDAN P.空气耦合超声换能器声场的时域计算方法[J].无损检测, 2020, 42(5):59-62. [5] 周盛.应用于地震物理模拟技术中的空气耦合超声换能器的研究[D].南京:南京航空航天大学, 2013. [6] CHIMENTI D E.Review of air-coupled ultrasonic materials characterization[J].Ultrasonics, 2014, 54(7):1804-1816.
[7] 林书玉.超声换能器的原理及设计[M].北京:科学出版社, 2004. [8] 宋智.基于压电振子径向振动的匹配层气介超声换能器设计[D].杭州:浙江大学, 2018. [9] 周正干, 魏东, 向上.线性调频脉冲压缩方法在空气耦合超声检测中的应用研究[J].机械工程学报, 2010, 46(18):24-28, 35. [10] 曹慧丽.空气超声换能器及其发射、接收装置的研究[D].西安:西北工业大学, 2007. [11] GÓMEZ ALVAREZ-ARENAS T E.Air-coupled piezoelectric transducers with active polypropylene foam matching layers[J].Sensors, 2013, 13(5):5996-6013.
[12] ALVAREZ-ARENAS T E G.Acoustic impedance matching of piezoelectric transducers to the air[J].IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2004, 51(5):624-633.
[13] KELLY S P, HAYWARD G, ALVAREZ-ARENAS T E G.Characterization and assessment of an integrated matching layer for air-coupled ultrasonic applications[J].IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2004, 51(10):1314-1323.
[14] 牛今丹.超声换能器声匹配层设计方法及其声学特性研究[D].哈尔滨:哈尔滨工业大学, 2014. [15] 秦传玺.双匹配层空气耦合超声换能器研究[D].南京:南京大学, 2018.
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