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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Curved PVDF airborne transducer
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Curved PVDF airborne transducer

机译：弯曲PVDF机载传感器

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摘要

In the application of airborne ultrasonic ranging measurement, a partially cylindrical (curved) PVDF transducer can effectively couple ultrasound into the air and generate strong sound pressure. Because of its geometrical features, the ultrasound beam angles of a curved PVDF transducer can be unsymmetrical (i.e., broad horizontally and narrow vertically). This feature is desired in some applications. In this work, a curved PVDF air transducer is investigated both theoretically and experimentally. Two resonances were observed in this transducer. They are length extensional mode and flexural bending mode. Surface vibration profiles of these two modes were measured by a laser vibrometer. It was found from the experiment that the surface vibration was not uniform along the curvature direction for both vibration modes. Theoretical calculations based on a model developed in this work confirmed the experimental results. Two displacement peaks were found in the piezoelectric active direction of PVDF film for the length extensional mode; three peaks were found for the flexural bending mode. The observed peak positions were in good agreement with the calculation results. Transient surface displacement measurements revealed that vibration peaks were in phase for the length extensional mode and out of phase for the flexural bending mode. Therefore, the length extensional mode can generate a stronger ultrasound wave than the flexural bending mode. The resonance frequencies and vibration amplitudes of the two modes strongly depend on the structure parameters as well as the material properties. For the transducer design, the theoretical model developed in this work can be used to optimize the ultrasound performance.
机译：在机载超声波测距应用中，部分圆柱形（弯曲）的PVDF传感器可以有效地将超声波耦合到空气中并产生强大的声压。由于其几何特征，弯曲的PVDF换能器的超声波束角度可能是不对称的（即，水平方向较宽，垂直方向较窄）。在某些应用程序中需要此功能。在这项工作中，在理论上和实验上都研究了弯曲的PVDF空气传感器。在该换能器中观察到两个共振。它们是长度延伸模式和弯曲弯曲模式。通过激光振动计测量这两种模式的表面振动曲线。从实验中发现，对于两种振动模式，表面振动沿曲率方向均不均匀。基于这项工作开发的模型的理论计算证实了实验结果。在长度延伸模式下，在PVDF膜的压电活性方向上发现了两个位移峰。对于弯曲弯曲模式，发现了三个峰值。观察到的峰位置与计算结果非常吻合。瞬态表面位移测量表明，对于长度延伸模式，振动峰同相，对于弯曲弯曲模式，振动峰异相。因此，长度延伸模式可以产生比弯曲弯曲模式更强的超声波。两种模式的共振频率和振动幅度在很大程度上取决于结构参数以及材料特性。对于换能器设计，这项工作中开发的理论模型可用于优化超声性能。

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