一种基于双荧光比值法的光纤温度传感器

提出了一种基于荧光强度比值法的光纤温度传感器并通过实验来具体探究其性能。实验中采用塑料光纤来传导激励光，以及接收罗丹明B 和罗丹明110两种荧光物质发出的荧光。由于罗丹明B 对温度敏感而罗丹明110对温度不敏感，因此可通过计算两种物质的荧光强度比来标定温度。为了得到理想的测温性能，进行了大量实验以确定出可用于比值法的最佳荧光光谱范围。该传感器在25~60 ℃的范围内能稳定工作，可获得0.38 ℃的最小均方误差及0.0134 /℃的灵敏度。此外，通过实验证明该传感器对曲率半径大于9 mm 的光纤弯曲不敏感；在现场温度测量方面有较大的应用潜力。

Abstract

A fiber-optic temperature sensor based on fluorescence intensity ratiometric (FIR) method is proposed and investigated experimentally. Plastic optical fibers are employed for transmitting the excitation light and collecting the Rhodamine B (RHB) and Rhodamine110 (RH110) fluorescence signals. Given that the fluorescence intensity of RHB is temperature-dependent while that of RH110 is temperature-independent, the temperature can be measured by calculating the fluorescence intensity ratio of these two dyes. To achieve a desired performance, the optimal integration ranges of fluorescence intensities of the two dyes are identified via considerable experimental tests. Indeed, a precise measurement is achieved in experiments. The feasible range of temperatures is from 25 ℃ to 60 ℃ ; a minimum rms temperature error of 0.38 ℃ and a sensitivity of 0.0134 /℃ are achieved. Further, the proposed sensor is proved to be insensitive to fiber bending for bend radii exceeding 9 mm. Thus, the sensor can be used for in situ temperature monitoring.

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杜新超, 周利斌, 贺正权, 刘丰, 林霄, 胡宝文, 郭小艺, 罗宝科, 任立勇, 李育林. 一种基于双荧光比值法的光纤温度传感器[J]. 中国激光, 2015, 42(8): 0805002. Du Xinchao, Zhou Libin, He Zhengquan, Liu Feng, Lin Xiao, Hu Baowen, Guo Xiaoyi, Luo Baoke, Ren Liyong, Li Yulin. A Fiber-Optic Temperature Sensor Based on Dual Fluorescence by Using FIR Method[J]. Chinese Journal of Lasers, 2015, 42(8): 0805002.

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