论文部分内容阅读
为了使大型发电机具备内部温度场实时监测能力,将联有多个光纤布拉格光栅(fiber Bragg gratings,FBG)的光纤植入定子线棒中,将光纤光栅置于被关心的温度点,实现了定子线棒温度的准分布式多点测量。植入实验表明,裸FBG很容易在植入过程中损坏,且温度特性易受绝缘材料影响;不锈钢毛细管封装FBG可以抵抗定子线棒加工过程中的高温高压及外力的损害,是一种可行的植入方案。在选择植入位置时,实心铜股线和换位绝缘是能够植入FBG的位置。植入FBG后线棒的温度实验表明,嵌入线棒内部的FBG波长随温度变化的线性度为0.999 66,FBG波长时间响应曲线与对应点热电偶温度时间响应曲线有很好的一致性,具有几乎相同的响应时间。基于光纤光栅的准分布式测温技术实现定子线棒温度的实时测量是可行的。
In order to enable large generators to have real-time monitoring of the internal temperature field, an optical fiber with multiple fiber Bragg gratings (FBGs) is implanted into the stator bar and the fiber gratings are placed at the temperature point of interest to achieve Stator bar temperature quasi - distributed multi - point measurement. Implantation experiments show that bare FBG can easily be damaged during implantation, and the temperature characteristics are easily affected by the insulation material. The stainless steel capillary package FBG can resist the damage of high temperature, high pressure and external force in the processing of stator bar, which is feasible Implantation program. Solid copper strands and transposed insulation are the places where the FBG can be implanted when choosing the implantation site. Experimental results show that the linearity of the FBG wavelength with temperature inside the embedded bar is 0.999 66. The FBG wavelength response time and the temperature response time of the corresponding thermocouple have good agreement. Almost the same response time. The quasi-distributed temperature measurement based on fiber grating real-time measurement of stator bar temperature is feasible.