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| Magneto-Acousto-Electrical NDT Based on PhotoacousticTransducer Using Carbon Nanotubes Composite Thin Film |
| Ding Guangxin1, 2, XiaHui1, Liu Guoqiang1, Li Xiaonan1 |
1. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China;
2. University of Chinese Academy of Sciences Beijing 100049 China |
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Abstract Conventional magneto-acousto-electrial (MAE) NDT is limited by the narrow bandwidth of ultrasound and suffers from the electromagnetic interference in magnetic field environment using piezoelectric ultrasonic transducer. In order to address these issues, a photoacoustic transducer (PAT) using carbon nanotubes- polydimethylsiloxane (CNTs-PDMS) composites for optoacousticconversion was proposed, based on the principle of photoacoustic which transforms pulsed laser into pulsed ultrasound. First, CNTs thin film deposited on the surface of the glass substrate by a spin-coating method for photothermal conversion. And then PDMS with high coefficient of thermal expansion was deposited on CNTs coated glass substrate for the generation of pulsed ultrasound. The produced CNTs-PDMS composite film PAT was verified with ultrasonic field. Finally, the experimental system for MAE-NDT based on composite thin film PAT is designed. Under a 532nm pulsed laser excitation, experimental results indicate that the amplitude of the generated ultrasonic signal by the proposed composite film PAT was as high as 5.7 MPa and -6 dB frequency bandwidth of the PAT was measured to be 17 MHz. This paper also demonstrated its capability for testing defect position in aluminum alloy with MAE-NDT. The proposed composite thin film PAT is expected to alternative with electric ultrasonic transducer for extreme and high-demand application.
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Received: 29 June 2018
Published: 17 July 2019
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2019, Vol. 34 
