Determination of the material properties of polymers using laser-generated broadband ultrasound
Determination of the material properties of polymers using laser-generated broadband ultrasound
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DOI：
10.5194/jsss-5-187-2016
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发表时间：
2016-01-01
影响因子：
1
通讯作者：
Henning, Bernd
中科院分区：
文献类型：
--
作者：
Claes, Leander;Meyer, Thorsten;Henning, Bernd
在材料特性的无损测定中，超声波的利用已被证明是一种可行的工具。在本文中，激光通过光声效应在板状样品中产生宽带声波。使用基于压电陶瓷而不是常用的压电聚合物薄膜的专用超声波换能器来检测波。这种新的传感器概念可以高灵敏度地检测高达 10 MHz 的超声波，从而可以对聚合物等高阻尼材料进行表征。使用不同的方法对记录的数据进行分析，以获得沿样本传输的传播模式的信息。在逆过程中，将获得的结果与模拟进行比较，得出样本材料特性的近似值。
In the non-destructive determination of material properties, the utilization of ultrasound has proven to be a viable tool. In the presented paper, a laser is used to create broadband acoustic waves in plate-shaped specimens by applying the photoacoustic effect. The waves are detected using a purpose-built ultrasonic transducer that is based on piezoceramics instead of the commonly used piezoelectric polymer films. This new transducer concept allows for detection of ultrasonic waves up to 10 MHz with high sensitivity, thereby allowing the characterization of highly damping materials such as polymers. The recorded data are analysed using different methods to obtain information on the propagation modes transmitted along the specimen. In an inverse procedure, the gained results are compared to simulations, yielding approximations for the specimen's material properties.