高精度温度计在同层水温平行观测中的互相干扰现象

Mutual interference of high precision thermometer in the water temperature observation of the same layer

摘要:

在2015年4月24日一次意外供电故障中，发现宁波地震台高精度温度计在井水温度同层平行观测中有明显的互相干扰现象。认为目前水温观测到的是水井内实际温度与传感器工作时的“升温值”之和，而“升温值”是动态值，其取决于每套仪器的系统特性，一般可能会在0.01℃以上；相互影响可能在0.005℃以上，如果是捆绑式平行观测可能会更高。所以水温测值的波动范围为10－4℃的观测井中，这种干扰不可忽视，并可能影响前兆异常的提取。因此，在水温波动比较小的观测井(泉)中，不主张做同层平行对比观测。最好在一个传感器内安装2套探测温度装置，既免互相干扰，又可相互验证。

Abstract:

In an accident of power supply on April 24,2015，Ningbo seismic station found clear interferences of high accuracy thermometer in the same layer observations. We believed that the water temperature observed is a joint result of the actual temperature and the working temperature rise of the sensor. This rise is a dynamic value，depending on the systematic characteristics of the instruments，with an average of 0.01℃ and more than 0.005℃ with interference. The rise can be higher in a parallel observation. Therefore, in an observation with the temperature fluctuation of 10－4℃，the interference should not be ignored which could lead to precursory anomalies. We therefore suggest that no parallel observation of the same layer be needed in wells of small fluctuating temperatures. There should be two sets of temperature detecting devices in a sensor so as to avoid mutual interference but gain mutual confirmation.