Abstract This paper presents the design, fabrication and testing of a single-mode fiber optic ultrasound transducer. This transducer can work as an ultrasound generator and a receiver, based on principles of photoacoustic (PA) effect and Fabry–Perot (FP) interference. PA effect is a process in which ultrasound waves are generated from optical energy by a PA material, and an FP structure is used for ultrasound receiving. The transducer was manufactured by coating a material called gold nanocomposite directly onto a single-mode optical fiber tip. The gold nanocomposite acted as the PA material and formed the FP structure as well. The transducer had the same size as the single-mode fiber, whose diameter was only 125 μm. It demonstrated its ability to generate ultrasound signals with a bandwidth of 5.6 MHz at an efficiency of 3.2 × 10−5 and function as an ultrasound receiver with a sensitivity of 2.81 mV/MPa. The generator and receiver built together can currently only work separately. This new transducer has substantial potential to work in restricted space and harsh environments for non-destructive testing.

中文翻译：

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在一根单模光纤上验证超声换能器的生成和接收功能

摘要 本文介绍了单模光纤超声换能器的设计、制造和测试。基于光声 (PA) 效应和法布里-珀罗 (FP) 干涉原理，该换能器可用作超声波发生器和接收器。PA效应是PA材料利用光能产生超声波的过程，采用FP结构进行超声波接收。该换能器是通过将一种称为金纳米复合材料的材料直接涂覆在单模光纤尖端上制成的。金纳米复合材料作为 PA 材料并形成 FP 结构。换能器的尺寸与单模光纤相同，其直径仅为 125 μm。它展示了它能够以 3 倍的效率生成带宽为 5.6 MHz 的超声信号。2 × 10−5 并用作灵敏度为 2.81 mV/MPa 的超声接收器。构建在一起的发生器和接收器目前只能单独工作。这种新型传感器具有在有限空间和恶劣环境中进行无损检测的巨大潜力。