Munich University of Applied Sciences, Photonics Laboratory, D-80335 Munich, Germany.
Siemens AG, Corporate Technology, CT RDA SII SSI-DE, D-91058 Erlangen, Germany.
Sensors (Basel). 2019 Jan 3;19(1):144. doi: 10.3390/s19010144.
A novel technique for strain and temperature decoupling with surface-glued fiber Bragg gratings (FBGs) is presented and applied for strain-independent temperature measurements in a temperature range between -30 °C and 110 °C with uncertainties below 4 °C over the entire measurement range. The influence of temperature-dependent glue-induced transversal forces on the fiber sensor could be eliminated with a sensor element consisting of two FBGs in identical polarization-maintaining fibers that were spliced perpendicular to each other. After aligning and gluing the sensor element with its optical axes parallel and perpendicular to the specimen, the averaged Bragg wavelength shifts of both FBGs were proven to be independent of the glue's influence and therefore independent of any change in the material characteristics of the glue, such as aging or creeping behavior. For the first time, this methodology enables temperature measurements with surface-attached bare FBGs independently of arbitrary longitudinal and glue-induced strains. This is of great value for all applications that rely on a fully glued sensor design, e.g., in applications with high electromagnetic fields, on rotating parts, or in vacuum for space applications.
提出了一种新颖的应变和温度解耦技术，该技术采用表面粘贴光纤布拉格光栅（FBG），可在-30°C 至 110°C 的温度范围内进行应变无关的温度测量，整个测量范围内的不确定度低于 4°C。通过由两个在相同保偏光纤中且相互垂直熔接的 FBG 组成的传感器元件，可以消除温度相关的胶引起的横向力对光纤传感器的影响。在将传感器元件与样品平行和垂直的光轴对准并胶合后，两个 FBG 的平均布拉格波长位移都被证明与胶的影响无关，因此与胶的材料特性（如老化或蠕变行为）的任何变化无关。这种方法首次实现了使用表面粘贴的裸 FBG 进行温度测量，而不受任意纵向和胶引起的应变的影响。这对于所有依赖于完全胶合传感器设计的应用都非常有价值，例如在存在强电磁场、在旋转部件上或在太空应用中的真空环境中。
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