Experimental Evaluation of Three Designs of Electrodynamic Flexural Transducers.
Experimental Evaluation of Three Designs of Electrodynamic Flexural Transducers.
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DOI：
10.3390/s16091363
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发表时间：
2016-08-25
期刊：
影响因子：
--
通讯作者：
Dixon S
中科院分区：
文献类型：
--
作者：
Eriksson TJ;Laws M;Kang L;Fan Y;Ramadas SN;Dixon S
介绍并比较了用于空气耦合超声波的电动弯曲换能器 (EDFT) 的三种设计。采用全金属外壳以保证坚固性，这使得设计更适合工业应用。外壳的设计使得前面有一块薄金属板，基本弯曲振动模式为~50 kHz。通过使用弯曲共振模式，无需使用匹配层即可实现与负载介质的良好耦合。前辐射板由换能器内部的螺旋线圈以电动方式驱动，当施加交流电流时，该螺旋线圈会产生感应磁场。该传感器的运行无需使用压电材料，这可以简化制造过程并延长传感器的使用寿命，并为高温应用开辟了可能性。结果表明，不同的设计对于超声波的产生和接收表现最佳。所有三种设计均产生较大的声压输出，在距离最高输出传感器 40 厘米处记录的声压级 (SPL) 高于 120 dB。然而，传感器的灵敏度较低，在发射-接收模式下单次信噪比为 dB，发射器和接收器相距 40 cm。
Three designs for electrodynamic flexural transducers (EDFT) for air-coupled ultrasonics are presented and compared. An all-metal housing was used for robustness, which makes the designs more suitable for industrial applications. The housing is designed such that there is a thin metal plate at the front, with a fundamental flexural vibration mode at ∼50 kHz. By using a flexural resonance mode, good coupling to the load medium was achieved without the use of matching layers. The front radiating plate is actuated electrodynamically by a spiral coil inside the transducer, which produces an induced magnetic field when an AC current is applied to it. The transducers operate without the use of piezoelectric materials, which can simplify manufacturing and prolong the lifetime of the transducers, as well as open up possibilities for high-temperature applications. The results show that different designs perform best for the generation and reception of ultrasound. All three designs produced large acoustic pressure outputs, with a recorded sound pressure level (SPL) above 120 dB at a 40 cm distance from the highest output transducer. The sensitivity of the transducers was low, however, with single shot signal-to-noise ratio dB in transmit–receive mode, with transmitter and receiver 40 cm apart.
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