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基于菲涅耳反射原理和光时域反射(OTDR)技术,提出了一种新型的、结构简单的准分布式光纤温度传感器。传感器由两个端面抛光的光纤对接构成,并在两端面间隙中填充温敏材料。传感器周围温度变化改变温敏材料的折射率,从而引起菲涅耳反射强度的变化。将三个传感头串联,利用OTDR探测各传感器菲涅耳反射的微弱变化实现温度传感和传感器定位。在-30~80℃范围内,随着温度升高,该系统各个传感头的菲涅耳反射强度单调增大,且温度传感特性具有良好的重复性,同时具有极低的附加损耗。
Based on Fresnel reflection principle and optical time domain reflectometry (OTDR) technology, a novel and simple structure of quasi-distributed optical fiber temperature sensor is proposed. The sensor consists of two face-polished optical fiber butts and a temperature-sensitive material filled in the gap between the two end faces. The temperature change around the sensor changes the refractive index of the temperature-sensitive material, thereby causing a change in the Fresnel reflection intensity. The three sensors in series, the use of OTDR detector fresnel reflection of each sensor weak changes in temperature sensing and sensor positioning. In the range of -30 ~ 80 ℃, the Fresnel reflection intensity of each sensor head of the system increases monotonically with the increase of temperature, and the temperature sensing characteristic has good repeatability, meanwhile, it has extremely low additional loss.