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基于单个倾斜光纤光栅(TFBG)提出了一种实现双参量曲率和温度同时测量的方法。研究发现,当弯曲方向与光栅栅面成一定角度时,倾斜光纤光栅的纤芯模谐振波长对弯曲不敏感而随外界温度变化线性漂移;低阶包层模谐振峰透射功率随曲率的增加而线性减小且对温度变化不敏感。由此特性提出了用单个倾斜光纤光栅的纤芯模谐振波长和低阶包层模谐振峰透射功率,分别实现对两个参量温度和曲率进行同时独立测量的传感器设计方案,该方法有望解决光纤光栅在测量中存在的温度和弯曲之间的交叉敏感问题。
A method for simultaneous measurement of two-parameter curvature and temperature is proposed based on a single tilted fiber grating (TFBG). It is found that when the bending direction is at an angle with the grating grating, the resonant wavelength of the fiber core of the tilted fiber grating is not sensitive to bending and linearly changes with the outside temperature. The transmission power of the resonant peak of the low order cladding mode increases with the increase of curvature Linear decreases and is not sensitive to temperature changes. Based on this characteristic, the sensor design scheme of simultaneously measuring the temperature and the curvature of the two parameters simultaneously with the resonant wavelength of the core mode and the single-mode fiber grating resonant wavelength and the low-order clad mode is proposed. This method is expected to solve the problem that the optical fiber The problem of cross-sensitivity between the temperature and bending that the grating has in the measurement.