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Transduction mechanisms of the Fabry-Perot polymer film sensing concept for wideband ultrasound detection

机译:Fabry-Perot聚合物薄膜传感概念在宽带超声检测中的转导机制

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摘要

The transduction mechanisms of a wideband (30 MHz) contact ultrasound sensor based upon the use of a thin polymer film acting as a Fabry-Perot interferometer have been investigated. Polyethylene terepthalate (PET) sensing elements, illuminated by the free-space collimated output of a wavelength-tunable DBR laser diode, have been used to study the sensor transfer function, sensitivity, the effect of water absorption, and frequency response characteristics. Acoustic performance was evaluated by comparing the sensor output with that of a calibrated PVDF membrane hydrophone using laser-generated acoustic transients as a source of broadband ultrasound. An ultrasonic acoustic phase sensitivity of 0.1 rad/MPa, a linear operating range to 5 MPa, and a noise-equivalent-pressure of 20 kPa over a 25 MHz measurement bandwidth were obtained using a water-backed 50 /spl mu/m PET sensing film. A model of frequency response that incorporates the effect of an adhesive layer between the sensor film and backing material has been developed and validated for different sensing film thicknesses, backing configurations, and adhesive layer thicknesses.
机译:已经研究了基于用作法布里-珀罗干涉仪的聚合物薄膜的宽带(30 MHz)接触式超声传感器的转导机制。聚对苯二甲酸乙二酯(PET)传感元件由波长可调DBR激光二极管的自由空间准直输出照明,已用于研究传感器的传递函数,灵敏度,吸水率和频率响应特性。通过将传感器输出与校准后的PVDF膜水听器的输出进行比较来评估其声学性能,其中使用激光产生的声瞬变作为宽带超声源。使用回水为50 / spl mu / m的PET传感技术,可以得到0.1 rad / MPa的超声声相灵敏度,5 MPa的线性工作范围以及在25 MHz的测量带宽上为20 kPa的噪声当量压力电影。已经开发了一种频率响应模型,该模型结合了传感器膜和背衬材料之间的粘合层的作用,并针对不同的传感膜厚度,背衬配置和粘合层厚度进行了验证。

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