地下热式渗流传感器的设计与研究

Design and research of underground thermal seepage sensor

针对当前渗流测量领域中存在渗流流速测量精度不高,无法进行长期测量等问题,提出一种新的渗流测量方法,该方法是对流经微小管径内的渗流直接进行加热,使用Pt100测量加热前后温度变化,以此来计算渗流流速。在该方法的基础上,设计制作一款地下热式渗流测量传感器,该传感器使用Lora模块来完成数据的远程无线传输,实现实时在线监测,使用太阳能供电系统来达到良好的能量供给,维持传感器长期稳定的工作。通过在砂土中对设计的传感器进行渗流测速实验,证明该传感器能够有效地对渗流流速进行测量,测量范围在0.0001~0.0013 m/s,最大相对误差绝对值为6.72%。

Aiming at the current seepage measurement field,there is a problem that the measurement accuracy of seepage velocity is not high and it can not be measured for a long time,a new seepage measurement method is proposed.This method is to directly heat the seepage flowing through the small pipe diameter,and use the Pt100 temperature measuring resistor to measure the temperature change before and after heating,so as to calculate the seepage flow rate.On the basis of this method,an underground thermal seepage measurement sensor was designed and manufactured.The sensor uses the Lora module to complete the remote wireless transmission of data,realizes real-time online monitoring,uses a solar power system to achieve a good energy supply,and maintains the long-term stable operation of the sensor.Through the seepage velocity measurement experiment on the designed seepage sensor in sand,it is proved that the sensor can effectively measure the seepage velocity,the measurement range is 0.0001-0.0013 m/s,and the maximum measurement error is about 6.72%.