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

机译:Fabry-Perot聚合物薄膜感测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) contactnultrasound sensor based upon the use of a thin polymer film acting as anFabry-Perot interferometer have been investigated. Polyethylenenterepthalate (PET) sensing elements, illuminated by the free-spacencollimated output of a wavelength-tunable DBR laser diode, have beennused to study the sensor transfer function, sensitivity, the effect ofnwater absorption, and frequency response characteristics. Acousticnperformance was evaluated by comparing the sensor output with that of ancalibrated PVDF membrane hydrophone using laser-generated acousticntransients as a source of broadband ultrasound. An ultrasonic acousticnphase sensitivity of 0.1 rad/MPa, a linear operating range to 5 MPa, andna noise-equivalent-pressure of 20 kPa over a 25 MHz measurementnbandwidth were obtained using a water-backed 50 Μm PET sensing film.nA model of frequency response that incorporates the effect of annadhesive layer between the sensor film and backing material has beenndeveloped and validated for different sensing film thicknesses, backingnconfigurations, 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,已被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声学性能,其中使用激光产生的声学瞬变作为宽带超声源进行校准。使用回水的50μmPET传感薄膜获得了0.1 rad / MPa的超声声相灵敏度,线性工作范围为5 MPa,在25 MHz的测量带宽上具有20 kPa的噪声当量压力.nA频率响应模型已经开发并结合了在传感器膜和背衬材料之间的粘合层效果的传感器,并已针对不同的传感膜厚度,背衬配置和粘合剂层厚度进行了验证

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