Interrogation of fiber Bragg grating dynamic strain sensors by self-mixing interferometry
Interrogation of fiber Bragg grating dynamic strain sensors by self-mixing interferometry
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DOI：
10.1109/jsen.2008.926961
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发表时间：
2008-07-01
影响因子：
4.3
通讯作者：
Bosch, Thierry
中科院分区：
文献类型：
--
作者：
Suleiman, Maha;Seat, Han Cheng;Bosch, Thierry
对单纵模激光器腔内的光学反馈或自混合干涉的创新研究被描述为新颖询问方案的组成部分，该方案将用于基于光纤布拉格光栅的传感器进行应变测量。整个传感器设备仅由一个带有集成光电二极管的激光二极管组成，该光电二极管在应变下耦合到光纤布拉格光栅。一小部分从光栅结构共振反射的注入光波重新进入激光腔并改变激光器的发射特性，从而形成包含嵌入应变信息的特征锯齿条纹。因此，通过分析和实验验证了通过自混合干涉测量法解调动态机械载荷下光纤布拉格光栅引起的小波长偏移的可行性。得到了比较好的佐证。
An innovative investigation of optical feedback or self-mixing interference within the cavity of a single-longitudinal-mode laser is described as an integral part of a novel interrogation scheme to be employed in a fiber Bragg grating-based sensor for strain measurement. The entire sensor device simply consists of a laser diode with an integrated photodiode which is coupled to a fiber Bragg grating under strain. A small percentage of the injected lightwave resonantly reflected off the grating structure reenters the laser cavity and modifies the emission properties of the laser, resulting in the formation of characteristic sawtooth fringes which contain the embedded strain information. The feasibility of demodulating the induced small wavelength shifts of fiber Bragg gratings under dynamic mechanical loading by self-mixing interferometry is thus presented analytically and experimentally verified. A relatively good corroboration has been achieved.