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提出了一种新型光纤Bragg光栅(FBG)的倾斜传感器,其结构由通过4根等长的刻有光栅的光纤悬挂在圆盘上的重物组成,4根光纤与圆盘的粘接点均匀分布在圆盘边缘,每根光纤的另一端共同下拉一重物,使每根FBG的受力均匀。当整个平台倾斜时,每根FBG的受力发生变化,从而导致每根FBG的反射(透射)中心波长发生变化,并通过光谱仪测出波长的变化,从中得到每两根对称FBG在不同倾斜角下的波长差,建立相应的波长差与倾斜角的数学模型。实验表明:该倾斜传感器可以达到0.2°的测量精度,并且消除了外界环境温度的影响,应用灵活性高;而且传感器的准确度和精度可通过增加重物质量、减小每对光纤间的夹角来提高。
A novel fiber Bragg grating (FBG) tilt sensor is proposed. Its structure is composed of heavy objects suspended on a disk by four equal length grating optical fibers. The bonding points of the four optical fibers and the disk are uniform Distributed in the edge of the disc, the other end of each fiber together pull down a heavy object, so that each FBG force uniform. When the entire platform is tilted, the force of each FBG changes, resulting in the change of the center wavelength of the reflection (transmission) of each FBG and the change of the wavelength measured by the spectrometer. From this, every two symmetrical FBGs are measured at different tilt angles Under the wavelength difference, the establishment of the corresponding wavelength difference and tilt angle of the mathematical model. Experiments show that the tilt sensor can achieve the measurement accuracy of 0.2 ° and eliminate the influence of external ambient temperature and has high application flexibility. Moreover, the accuracy and accuracy of the sensor can be reduced by increasing the weight of the heavy object and reducing the distance between each pair of optical fibers Corner to improve.