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A Closed-Loop Interrogation Technique for Multi-Point Temperature Measurement Using Fiber Bragg Gratings

机译:光纤布拉格光栅用于多点温度测量的闭环询问技术

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摘要

In this paper a closed-loop interrogation technique for multi-point temperature measurement using fiber Bragg gratings (FBG) is presented. The technique uses a broadband light source and $n$ tunable FBGs to interrogate an array of $n$ FBGs sensors placed along the optical fiber. Each center wavelength of the tunable FBGs is matched with the center wavelength of one FBG sensor placed in the array. The light source directly illuminates the sensor array, so that all the light reflected from the FBGs enters in the optical circuit through an optical circulator and the reflected spectrum of each sensing FBG illuminates a matched tunable FBG. Because the current generated by the photodiode is proportional to the convolution between the two FBGs profiles (the sensor FBG and the tunable FBG), by controlling the value of the convolution at a fixed value, the center wavelengths of the two FBGs are kept spaced by a constant value. Therefore, the temperature of the FBG sensor can be associated with the temperature of the tunable FBG. A two channel prototype was constructed to validate the technique and a very high resolution of $pm 0.001^{,circ}$C was obtained.
机译:本文提出了一种使用光纤布拉格光栅(FBG)进行多点温度测量的闭环询问技术。该技术使用宽带光源和$ n $可调FBG询问沿光纤放置的$ n $ FBGs传感器阵列。可调FBG的每个中心波长与放置在阵列中的一个FBG传感器的中心波长匹配。光源直接照亮传感器阵列,因此从FBG反射的所有光都通过光环行器进入光路,每个感应FBG的反射光谱照亮匹配的可调FBG。由于光电二极管产生的电流与两个FBG轮廓(传感器FBG和可调FBG)之间的卷积成比例,因此通过将卷积的值控制为固定值,可以使两个FBG的中心波长保持一定距离一个恒定值。因此,FBG传感器的温度可以与可调FBG的温度相关联。构建了两个通道的原型以验证该技术,并获得了非常高的分辨率$ pm 0.001 ^ {,circ} $ C。

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