Research on Granary Temperature Network Monitoring System Based on the Linear Frequency Shift of Spectrum
WANG Gao, LIU Shao-cong, WEN Qiang, ZHAO Hui, ZHAO Yu
National Key Laboratory for Electronic Measurement Technology,Key Laboratory of Instrumentation Science and Dynamic Measurement, North University of China, Taiyuan 030051, China
Abstract:In order to obtain the distribution of the temperature in the range of the granary precisely and stably, we designed a temperature measurement system of the fiber Bragg grating. Through the fiber-optic network the system can detect granary temperature in a wide range, and there is a linear relationship between the measured temperature by fiber Bragg grating and the center wavelength, so according to the function of spectrum linear frequency shift it obtained precise temperature in the granary. The working wavelengths of each grating in the system are separated from each other. After reflected by 3 dB coupler, the wavelength detection and demodulation system was used to measure the linear frequency shift of the plurality grating, and the system can get temperature data of everywhere in the granary. The experimental obtained the temperature information by equipments, such as LPT-101 light source, optical fiber with FBG encapsulated, magnification processing circuit, simulation granary, etc. With Origin software the diagram of the relationship between the frequency shift of the measured temperature and wavelength was drawn, and compared with the traditional measuring method of the K-type thermocouple measurement data. Experimental results show that the measured temperature of the fiber Bragg grating is closer to standard temperature, and the anti-jamming ability can meet the requirements of the granary large range temperature monitoring.
Key words:Fiber Bragg grating;Temperature detection;Linear frequency shift of spectrum;Granary
王 高,刘少聪,闻 强,赵 辉,赵 宇 . 基于光谱线性频移的粮仓温度网络监测系统的研究 [J]. 光谱学与光谱分析, 2013, 33(04): 1146-1150.
WANG Gao, LIU Shao-cong, WEN Qiang, ZHAO Hui, ZHAO Yu . Research on Granary Temperature Network Monitoring System Based on the Linear Frequency Shift of Spectrum . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(04): 1146-1150.