Lupi Carla, Vendittozzi Cristian, Ciro Erwin, Felli Ferdinando, Pilone Daniela
Dipartimento Ingegneria Chimica Materiali Ambiente, Sapienza Rome University, Via Eudossiana 18, 00184 Rome, Italy.
Campus FGA-UnB, Universidade de Brasília, Brasília 72444-240, Gama Brasília-DF, Brazil.
Materials (Basel). 2023 Apr 7;16(8):2943. doi: 10.3390/ma16082943.
The structural integrity of mechanical components is assessed by FBG sensors in many industrial fields. The FBG sensor has a relevant application at very high or low temperatures. To avoid the variability of the reflected spectrum and the mechanical properties degradation of the FBG sensor, metal coatings have been used to guarantee the grating's integrity in extreme temperature environments. Particularly, at high temperatures, Ni could be a suitable selection as a coating to improve the features of FBG sensors. Furthermore, it was demonstrated that Ni coating and high-temperature treatments can recover a broken, seemingly unusable sensor. In this work, two main objectives were pursued: first, the determination of the best operative parameters to achieve the most compact, adherent, and homogeneous coating; second, the correlation between the obtained morphology and structure and the FBG spectrum modification, once Ni was deposited on the FBG sensor. The Ni coating was deposited from aqueous solutions. By performing heat treatments of the Ni-coated FBG sensor, it was investigated how the wavelength (WL) varied as a function of temperature and how that variation was caused by the structural or dimensional change of the Ni coating.
在许多工业领域中，光纤布拉格光栅（FBG）传感器用于评估机械部件的结构完整性。FBG传感器在极高温或极低温环境下有相关应用。为避免反射光谱的变化以及FBG传感器机械性能的退化，已采用金属涂层来确保光栅在极端温度环境下的完整性。特别是在高温下，镍作为涂层可能是改善FBG传感器特性的合适选择。此外，研究表明镍涂层和高温处理可以修复一个看似无法使用的损坏传感器。在这项工作中，追求两个主要目标：第一，确定实现最致密、附着性好且均匀涂层的最佳操作参数；第二，研究镍沉积在FBG传感器上后，所得涂层的形态和结构与FBG光谱变化之间的相关性。镍涂层通过水溶液沉积。通过对涂镍FBG传感器进行热处理，研究了波长（WL）如何随温度变化以及这种变化是由镍涂层的结构或尺寸变化引起的。
