作者：王燕飞，丁楠，程跃
单位；中国电子科技集团公司第八研究所，合肥 230051
中图分类号：TP212；TP277    
文献标识码：A    
文章编号：1006-883X(2018)03-0013-05
收稿日期：2018-01-18

摘要：介绍了一种基于分布式光纤传感器的溶液浓度的自动监测系统。该系统采用单片机作为系统的信号处理单元，以发光二极管（LED）为光源，利用脉冲宽度调制（PWM）方式控制发光脉冲，通过光纤传递光信号，用测量反射光的光纤探头作为敏感元件，对雪崩光电二极管（APD）接收到的采样信号进行处理，通过光纤将多个光纤溶液浓度传感器联成分布式测量网络，可以实现溶液浓度的大面积实时智能监控。通过对氯化钠（NaCl）溶液进行检测，得出系统的浓度检测灵敏度为0.1%，在1%浓度梯度下，其误差范围不大于0.7%。
关键词：分布式；光纤传感器；溶液浓度；自动监测

An Automatic Real-time Monitoring System for Solution Concentration Based on Distributed Optical Fiber Sensors
WANG Yan-fei, DING Nan, CHENG Yue
The No.8 Research Institution, China Electronic Technology Group Corporation, Hefei 230051, China
Abstract: An automatic real-time monitoring system for solution concentration based on distributed optical fiber sensor is introduced in this paper. The system uses MCU as the signal processing unit, light emitting diode (LED) as the light source, and pulse width modulation (PWM) as the control way of light pulses. With optical fiber as  transmission media of optical signals and optical probe as sensitive element for the measurement of reflected light, the system processes the sampled signals received by the avalanche photodiode (APD). Several optical fiber solution concentration sensors are combined into a distributed measuring network through optical fibers, so the solution concentration can be monitored in a large area in real time. The concentration of NaCl solution is measured with the system, and the results show that the sensitivity of the system is 0.1%, and the error range is less than 0.7% under the concentration gradient of 1%.
Key words: distributed; fiber optic sensor; solution concentration; automatic monitoring

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备注：2018年 第24卷 第03期