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Method of simultaneous measurement of two direction force and temperature using FBG sensor head

机译：使用FBG传感器头同时测量双向力和温度的方法

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This paper presents a method for measuring two components of bending force and temperature using one sensor head. Indirect inference based on the spectra of two fiber Bragg gratings (FBGs) placed on a cantilever beam is used. The method was developed during work on the inverse problem of determining a nonuniform stress distribution based on FBG spectra. A gradient in the FBG stress profile results in a characteristic shape of its reflective spectrum. The simultaneous measurements of force and temperature were possible through the use of an appropriate layout of the sensor head. The spectral characteristics of the sensor's gratings do not retain full symmetry, which is due to the geometry of the sensor's head and the related difference in the distribution of the axial stress of the gratings. In the proposed approach, the change in width of the sum of the normalized transmission spectra was used to determine the value of the applied force. In the presented method, an increase in the sensitivity of this change to the force is obtained relative to the other known systems. A change in the spectral width was observed for an increase in bending forces from 0 to 150 N. The sensitivity coefficient of the spectral width to force, defined as the ratio of the change of the spectral half-width to the change in force was 2.6e - 3 nm/N for the first grating and 1.2e - 3 nm/N for the second grating. However, the sensitivity of the whole sensor system was 5.8e - 3 nm/N, which is greater than the sum of the sensitivities of the individual gratings. For the purpose of this work, a station with a thermal chamber has been designed with a bracket on which fiber optic transducers have been mounted for use in further measurements. The sensor head in this experiment is considered to be a universal device with potential applications in other types of optical sensors, and it can be treated as a module for development through its multiplication on a single optical fiber. (C) 2015 Optical Society of America
机译：本文提出了一种使用一个传感器头测量弯曲力和温度两个分量的方法。使用基于放置在悬臂梁上的两个光纤布拉格光栅（FBG）的光谱的间接推断。该方法是在针对基于FBG光谱确定不均匀应力分布的反问题工作期间开发的。 FBG应力分布中的梯度导致其反射光谱的特征形状。通过使用传感器头的适当布局，可以同时测量力和温度。传感器光栅的光谱特性不能保持完全对称，这是由于传感器头部的几何形状以及光栅轴向应力分布的相关差异所致。在提出的方法中，使用归一化透射谱之和的宽度变化来确定作用力的值。在提出的方法中，相对于其他已知系统，这种变化对力的敏感性得到提高。当弯曲力从0增加到150 N时，观察到光谱宽度发生了变化。光谱宽度对力的敏感系数定义为光谱半宽度的变化与力的变化之比为2.6对于第一光栅，e-3 nm / N，对于第二光栅，e-3 nm / N。但是，整个传感器系统的灵敏度为5.8e-3 nm / N，大于各个光栅的灵敏度之和。为了进行这项工作，设计了一个带有热室的工作站，该工作站带有一个支架，在支架上安装了光纤传感器以用于进一步的测量。该实验中的传感器头被认为是一种通用设备，在其他类型的光学传感器中具有潜在的应用，并且可以通过在单根光纤上进行倍增将其视为开发模块。 （C）2015年美国眼镜学会

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