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Tunable optical source for the interrogation of Bragg gratings via spectral scanning

机译:用于通过光谱扫描询问布拉格光栅的可调光源

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This paper describes the implementation of an interrogation system with a tunable Erbium doped fiber ring-laser (EDFL). The EDFL is used to illuminate optical devices like Bragg gratings, so that it can also be used as an interrogation system to determine the spectral characteristics of the devices. An intra-cavity Fabry-Perot filter, driven by a dedicated voltage ramp generator, tunes the EDF laser. The resulting optical signal is captured by a photodetector and analyzed in a personal computer. The apparatus can be used as an optical spectrum analyzer for passive components and as an interrogation system for multiplexed fiber Bragg grating based sensors. As an application example, the temperature inside a concrete beam submitted to systematic heating and vibrations has been remotely measured with the system.
机译:本文介绍了带有可调谐掺do光纤环形激光器(EDFL)的询问系统的实现。 EDFL用于照亮布拉格光栅等光学设备,因此它也可以用作询问系统以确定设备的光谱特性。由专用电压斜坡发生器驱动的腔内Fabry-Perot滤波器可调谐EDF激光器。产生的光信号被光电探测器捕获并在个人计算机中进行分析。该设备可以用作无源组件的光谱分析仪,也可以用作基于多路光纤布拉格光栅的传感器的询问系统。作为一个应用示例,已经通过系统远程测量了受到系统加热和振动的混凝土梁内部的温度。

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