面向电机测温的嵌套结构管式光纤光栅传感器

针对电机内部实时测温的需求,设计了一种嵌套结构的管式光纤光栅传感器.该传感器使用陶瓷基片作为内层结构,以304不锈钢管作为保护外层,采用飞秒激光刻写的纯石英光纤光栅作为测温敏感元件.搭建了恒温油浴光纤传感测试系统,采用循环升降温的方法对其进行了温度特性研究,结果表明该传感器测温性能良好,升降温实验的线性相关系数均为0.999 9,在长期的循环实验中波长重复性为士2 pm,迟滞误差小于5 pm,有较高的可靠性,可用于电机内部的温度监测.

A Nested Structure Tubular Fiber Bragg Grating Sensor for Motor Temperature Measurement

In response to the need for real-time temperature measurement inside the motor, a nested tube fiber grating sensor was designed. It uses a ceramic substrate as the inner structure, a 304 stainless steel tube as the outer protection, and a pure silica fiber grating written by a femtosecond laser as the temperature sensing element. An optical fiber sensing test system of constant temperature oil bath was built, and the temperature characteristics of the sensor were studied by the method of cycling temperature rise and fall. Test results show that the sensor presents good temperature measurement performance, and the linear correlation coefficient of the temperature rise and fall experiment is 0.9999. In the long-term cycle experiment, the wavelength repeatability reaches ±2pm, and the hysteresis error is less than 5pm. It has high reliability and can be used for temperature monitoring inside the motor.