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Spatial characterization of the response of a silica optical fiber to wideband ultrasound

机译：二氧化硅光纤对宽带超声响应的空间表征

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摘要

Optical fibers have long been recognized as a promising technology for remote sensing of ultrasound. Nonetheless, very little is known about the characteristics of their spatial response, which is significantly affected by the strong acoustic mismatches between the fiber and surrounding medium. In this Letter, a new method is demonstrated for wideband spatial acoustic characterization of optical fibers. The method is based on the excitation of a point-like acoustic source via the opto-acoustic effect, while a miniature fiber sensor is implemented by a pi-phase-shifted fiber Bragg grating. Despite the relative complexity of acoustic wave propagation in the fiber, its spatial sensitivity in the high frequency band (6-30 MHz) exhibited an orderly pattern, which can be described by a simple model. This property reveals new possibilities for high-performance imaging using fiber-based ultrasound sensors, where knowledge of the sensor's spatial sensitivity map is generally required.
机译：长期以来，光纤一直被认为是用于超声遥感的有前途的技术。但是，人们对它们的空间响应特性知之甚少，而空间响应的特性受光纤与周围介质之间强烈的声学失配的影响很大。在这封信中，演示了一种用于光纤的宽带空间声学表征的新方法。该方法基于通过光声效应激发点状声源，而微型光纤传感器由pi相移光纤布拉格光栅实现。尽管声波在光纤中传播的相对复杂性，但其在高频带（6-30 MHz）中的空间灵敏度仍显示出有序的模式，可以通过简单的模型进行描述。此属性揭示了使用基于光纤的超声传感器进行高性能成像的新可能性，其中通常需要了解传感器的空间灵敏度图。

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