26 September 2007 Ultrasound fiber guides and sensor applications
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An overview of ultrasound fiber guides, their transmission properties, and their applications in sensing is presented. Ultrasound fiber guides are structures similar to optical fibers that are used for transmission of acoustic waves. They consist of a core region surrounded by a cladding layer to help confine the wave to the core. Ultrasound fiber guides may be fabricated with glass materials such as pure and doped fused silica, using fiber optics manufacturing technology. The underlying principles of fiber optic sensing in many cases are also applicable to ultrasound fiber guides, hence the potential applications of these waveguides in sensing and health monitoring of infrastructures. Propagation properties of ultrasound fiber guides are reviewed. Attention is focused on guides with small differences between the parameters of the core and cladding, often a necessary requirement for single-mode operation. Various types of guided modes including flexural, torsional, and radial modes are discussed. These modes are predominantly shear type. Ultrasound fiber guides also support another group of modes with complex propagation constants, which are referred to as leaky longitudinal modes. These modes lose power as propagate along the guide through radiation. Similarities and differences between optical and ultrasound modes in fiber guides are addressed.
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A. Safaai-Jazi, A. Safaai-Jazi, } "Ultrasound fiber guides and sensor applications", Proc. SPIE 6758, Photonics in the Transportation Industry: Auto to Aerospace, 675804 (26 September 2007); doi: 10.1117/12.738460; https://doi.org/10.1117/12.738460

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