【摘要】 设计了一种基于焦耳热的新型光纤布喇格光栅电压传感器以用于小电压的精确监测.实验中通过真空蒸镀法在光栅周围镀上一层金属镍,并将光栅密闭封装在充满气凝胶的铜管中.电压传感通过所镀金属镍层在通电过程中产生的焦耳热引起栅区温度升高,导致光纤光栅反射谱中心波长漂移,从而实现电压与光纤光栅中心波长漂移量的变换.实验表明,封装后的直流电压灵敏度达到520pm/V2,并可用于较低频率的交流传感,且系统结构简单、精度高、易于实现.更多还原

【Abstract】 A new type of fiber Bragg grating voltage sensor which is based on joule heat was designed and used to precisely monitor small voltage.In the experiment,a layer of nickel was plated around the grating by vacuum evaporation method and the grating was hermetically packaged in copper tube which is full of aerogel.The center of reflection spectrum of fiber Bragg grating drifts as the fiber grating heated due to the heat generated in nickel layer when the current goes through.Thus the transformation from voltage change to centre wavelength drift could be obtained.The experiment results show that the direct current voltage sensitivity after packaged is up to 520pm/V2,and it can be used in the low frequency alternating current sensing.This system owns the advantages of simple structure,high accuracy and easy to be implemented.更多还原