It is essential and indispensable to monitoring the volatile gas temperature of the refined oil for it is highly flammable and explosive,and the etched fiber Bragg grating (EFBG) is a suitable candidate of this field for absolutely insulative characteristic.In this paper,the sensor head based on the evanescent wave FBG has been manufactured,and utilized to measure the temperature of the air,and the volatile gases of diesel and gasoline.The theoretical expression of the reflective wavelength of EFBG is derived as a function of temperature,and compared with the experimental phenomenon.Experimental results show that the wavelength varies linearly with the gas temperature and agree with the theories very well,which indicates the FBG sensor is suitable to detect the temperature of volatile gas of the refined oil.%由于具有易燃、易爆特性,故成品油挥发气体的温度检测具有重要的实际意义,而作为绝缘器件的光纤光栅传感器在此传感领域具有天然的优势.本文在实验上设计了一种基于腐蚀光栅(Etched Fiber Bragg Grating)的温度传感器,并将其用于空气、柴油和汽油挥发气体的温度测量.推导了腐蚀光栅的反射波长随温度变化的理论表达式,并与实验现象进行了对比.理论结论与实验结果吻合.同时实验发现,气体的温度变化与光栅波长的漂移量呈现良好的线性关系,表明FBG倏逝波传感器完全适用于测量成品油挥发气体的温度.
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