Ricchiuti A L, Barrera D, Nonaka K, Sales S
Opt Lett. 2014 Oct 1;39(19):5729-31. doi: 10.1364/OL.39.005729.
A photonic sensor based on a 10-cm-long fiber Bragg grating (FBG) is presented and experimentally validated that is dedicated to detect the presence and the position of a temperature gradient. The system is based on the measurement of the central frequency distribution of the grating based on time-frequency domain analysis. A short optical pulse, having duration much shorter than the transit time along the grating, is coupled into the FBG, and the back-reflected pulse is scanned by means of an oscilloscope. A spatial resolution of 1 mm, given by half the input pulse duration, is achieved. The proposed sensor is based on a simple configuration and presents a sensing range of 10 cm, which could be further enhanced by fabricating a longer grating.
提出了一种基于10厘米长光纤布拉格光栅（FBG）的光子传感器，并通过实验验证了其专门用于检测温度梯度的存在和位置。该系统基于时频域分析对光栅中心频率分布进行测量。一个持续时间远短于沿光栅传播时间的短光脉冲被耦合到FBG中，并且通过示波器扫描背向反射脉冲。通过输入脉冲持续时间的一半实现了1毫米的空间分辨率。所提出的传感器基于简单的配置，传感范围为10厘米，通过制造更长的光栅可以进一步提高传感范围。
