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提出了一种基于π相位温度不敏感的双光纤布拉格光栅加速度传感技术,并设计了双光栅加速度传感器,对该传感器的温度特性和加速度对中心波长的响应进行了研究。给出了该传感器的结构及封装方法。从理论上分析了基于π相位温度不敏感的双光纤布拉格光栅加速度传感原理,分析了温度和加速度对波长的响应关系,推导了该光栅加速度传感器的响应灵敏度的解析表达式。通过实验分析双光栅的加速度响应和平坦区。实验结果表明,在温度比较宽的范围内,可实现温度不敏感加速度的准确测量,加速度响应灵敏度为15.52 pm/(m.s-2),实验值与理论值的相对误差为3.06%,加速度与波长具有较好的线性关系,线性度为99.8%,在小于共振频率的低频段具有较好的平坦区。表明该双光纤布拉格光栅加速度传感器具有温度不敏感特性,能实现低频加速度的准确测量。
A bi-fiber Bragg grating acceleration sensing technology based on π-phase temperature insensitivity was proposed. A dual-grating acceleration sensor was designed and the response of the sensor’s temperature characteristic and acceleration to the center wavelength was studied. The structure of the sensor and the method of packaging are given. The principle of acceleration sensing based on the double fiber Bragg grating with phase insensitivity is analyzed theoretically. The relationship between temperature and acceleration is analyzed. The analytical expression of the response sensitivity of the grating acceleration sensor is deduced. The acceleration response and flat area of double grating are experimentally analyzed. The experimental results show that the accurate measurement of temperature-insensitive acceleration can be achieved over a wide range of temperature, the sensitivity of acceleration response is 15.52 pm / (ms-2), the relative error between experimental and theoretical values is 3.06%, and the acceleration and wavelength Has a good linear relationship, the linearity of 99.8%, in the low frequency band less than the resonant frequency has a good flat area. It shows that the dual fiber Bragg grating acceleration sensor has temperature insensitive characteristics and can accurately measure low frequency acceleration.