Zou Xiaotian, Wu Nan, Tian Ye, Zhang Yang, Wang Xingwei
Appl Opt. 2013 Sep 1;52(25):6239-44. doi: 10.1364/AO.52.006239.
This paper presents a nondestructive ultrasound testing method for characterization of the resonant frequencies of polydimethylsiloxane (PDMS) thin film by using a miniature fiber optic photoacoustic (PA) probe. The PA probe was fabricated with an optical fiber and a synthesized gold nanocomposite. During the experiment, a cured PDMS thin film with a thickness of 220 μm was immersed into a water medium using a custom-designed holder to clamp the film. An acoustic pulse was generated by the PA probe and propagated through the water media to excite the fixed film. A fiber optic pressure sensor based on the Fabry-Perot principle was used to collect the excited acoustic signals on the other side of the film. The acquired response of the acoustic pulse was used to compute the resonant frequencies of the PDMS thin film based on a deconvolution method.
本文提出了一种无损超声检测方法，用于通过使用微型光纤光声（PA）探头来表征聚二甲基硅氧烷（PDMS）薄膜的共振频率。该PA探头由一根光纤和一种合成的金纳米复合材料制成。在实验过程中，使用定制设计的夹具将厚度为220μm的固化PDMS薄膜浸入水介质中以固定薄膜。PA探头产生一个声脉冲，并通过水介质传播以激发固定的薄膜。基于法布里-珀罗原理的光纤压力传感器用于收集薄膜另一侧激发的声信号。基于去卷积方法，利用采集到的声脉冲响应来计算PDMS薄膜的共振频率。
