Multi-parameter sensor based on single Long Period Grating in Panda fiber for the simultaneous measurement of SRI, temperature and strain
Multi-parameter sensor based on single Long Period Grating in Panda fiber for the simultaneous measurement of SRI, temperature and strain
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DOI：
10.1016/j.optlastec.2018.12.022
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发表时间：
2019-05-01
影响因子：
5
通讯作者：
Campopiano, Stefania
中科院分区：
文献类型：
--
作者：
Esposito, Flavio;Srivastava, Anubhav;Campopiano, Stefania
提出了一种可同时测量环境折射率、温度和应变的三参量传感器。它是基于一个单一的长周期光栅（LPG）写在保偏熊猫光纤，通过一个简单的技术，基于电弧放电。为此，执行三个不同谐振的波长偏移的监测，每个谐振与不同的包层模式相关联。此外，针对输入光的两个偏振（即，与光纤的慢轴和快轴对准）来获取共振集合。三参数感测是由以下事实促进的：谐振凹陷对SRI、温度和应变表现出不同的灵敏度，当偏振被切换时，这些灵敏度改变它们的幅度和符号。该传感器可以同时测量SRI在1.33-1.40范围内，温度在20-60 ℃之间，应变在数百μ m范围内。该装置可应用于材料科学和结构健康监测领域。
In this work, a three-parameter sensor for the simultaneous measurement of surrounding refractive index (SRI), temperature and strain is presented. It is based on a single Long Period Grating (LPG) written in a polarization-maintaining Panda fiber, by means of a simple technique based on Electric Arc Discharge. For the purpose, it is performed the monitoring of the wavelength shift of three different resonances, each one associated to a different cladding mode. Moreover, the set of resonances is acquired for two polarizations of the input light, i.e. aligned to the slow and fast axis of the fiber. The three-parameter sensing is promoted by the fact that the resonance dips show different sensitivities to SRI, temperature and strain, which change their magnitudes and signs when the polarization is switched. It was demonstrated that the sensor can be applied to simultaneously measure SRI in range 1.33-1.40, temperatures comprised in 20-60 degrees C, and strain of hundreds of mu epsilon. This device could find application in the fields of materials science and structural health monitoring.