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跨季节储热系统是太阳能集热技术和地源热泵技术相结合的一种综合利用新能源的采暖技术。为了测量地源热泵周围的土壤温度分布,为跨季节储热系统的设计和运行提供技术参数,对光纤光栅传感测温技术进行了研究。基于光纤光栅原理,采用可调谐光纤光栅滤波器对光纤光栅波长进行解调,检测光纤光栅波长微小的变化情况,从而计算出温度。光源发出的连续带宽光波长范围是1 526~1 562nm,系统有10个采样通道,每个通道12个测点,每个点相隔10m,采集速率同步25Hz。并设计了基于ARM的数据采集远传模块,实现光纤数据的远程传输和监测。经过对北京某监测点的近3个月的持续采样,实验结果显示,该测量系统精度能达到0.5℃,可以实时地、持续地测量地下土壤温度的分布,满足系统对监测温度的要求。
Inter-season heat storage system is a combination of solar energy heat collection technology and ground source heat pump technology, a comprehensive utilization of new energy heating technology. In order to measure the soil temperature distribution around the ground-source heat pump and provide the technical parameters for the design and operation of the cross-season heat storage system, the fiber grating sensing temperature measurement technology was studied. Based on the principle of FBG, a tunable FBG filter was used to demodulate the FBG wavelength to detect slight changes in the wavelength of the FBG to calculate the temperature. The light source emits a continuous bandwidth of light wavelength range is 1 526 ~ 1 562nm, the system has 10 sampling channels, each channel 12 measuring points, each point separated by 10m, acquisition rate synchronization 25Hz. And designs a remote data acquisition module based on ARM to realize remote transmission and monitoring of optical fiber data. After the continuous sampling of a monitoring point in Beijing for nearly three months, the experimental results show that the accuracy of the measuring system can reach 0.5 ° C, and the distribution of soil temperature in the underground can be continuously measured in real time to meet the requirements of the system for the monitoring temperature.