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光纤光栅是一种光无源器件,它是在光纤中形成折射率周期性变化的相位型光栅。由于光纤光栅的光谱特性由其光波导结构决定,因此光纤光栅对温度、应力等环境变量的敏感是其固有特性。光纤光栅传感器不仅具有光纤传感的几乎全部优点,而且还具有可复用性、可同时多参量传感等优点,因此近十年来已迅速成为最重要的光学传感器之一。光纤经过拉锥处理后,由于直径更细,对应力等环境因素变得更加的敏感,因此,基于拉锥光纤的这一特点可以制作高灵敏度的专用传感器。本文介绍了一种利用结合一个经过拉锥处理的多模光纤光栅和一个普通光纤光栅实现温度和应力的同步传感方案。
A fiber grating is an optically passive device that forms a phase grating with periodically varying refractive index in an optical fiber. Because the spectral characteristic of FBG is determined by its optical waveguide structure, FBG’s sensitivity to environmental variables such as temperature and stress is its inherent characteristic. Fiber grating sensors not only have almost all the advantages of optical fiber sensing, but also has the reusability, simultaneous multi-parameter sensing, etc., so the past decade has quickly become one of the most important optical sensors. After the optical fiber through the taper processing, due to the smaller diameter, the stress and other environmental factors become more sensitive, therefore, based on this feature of tapered optical fiber can produce high sensitivity special sensor. This paper presents a synchro- nous sensing scheme that combines temperature and stress using a multi-mode fiber grating with a taper and an ordinary fiber grating.