干涉截止滤光膜型光纤温度传感器的温度特性

Temperature Characteristics of Optical Fiber Temperature Sensor Based on Interferometric Cutoff Filter Film

光学薄膜因其自身的特点在光纤通信和光纤传感领域发挥着重要的作用。结合光学薄膜干涉理论和温度特性设计出一种干涉截止滤光膜型光纤温度传感器。该传感器的设计是基于采用等离子溅射的方法在玻璃基底上制备干涉型截止滤光膜在不同温度下用分光光度计测得的反射曲线的截止带边缘随温度漂移,利用截止带边缘上的特定波长的反射率变化与温度变化具有一定的线性关系,从而实现对环境温度参量的监测。为详细了解干涉截止滤光膜型光纤温度传感器的温度传感特性,对其展开了理论分析和试验研究,试验结果表明该传感器具有一定的可行性,在20~100℃的温度范围内具有1%的测量精度。

Optical thin film plays an important role in the field of optical fiber communication and optical fiber sensing for its own characteristics. Combined with the interference theory and the temperature characteristic of optical thin film, an optical fiber temperature sensor based on interferometric cutoff filter film is designed. The film is prepared on glass substrate by plasma sputtering method. The design of the sensor is based on the cutoff band edge of the film reflection curve drifting with temperature changing, which is measured by the spectrophotometer at different temperatures. Thus, using the certain linear relationship between the reflection index of the special wavelength on the cutoff band edge and temperature change can monitor the environment temperature parameter. In order to understand the temperature sensing characteristics of the sensor based on this film in detail, the theoretical analysis and experimental study are carried out. The experimental results show that the sensor has a certain feasibility, and has a measuring accuracy of 1% in the temperature range of 20 -100℃