河北怀来地震台不同型号气氡仪干扰因素及质量评价

Interference Factors and Quality Evaluation on Different Types of Radon Measurement Instruments at Hebei Huailai Station

以怀4井SD-3A与DDL-1型两套测氡仪串联同步观测资料为研究对象,对两种不同型号仪器的动态稳定性、内在质量及观测曲线进行分析。对于集气装置漏气、人为取样和更换冷凝管等干扰类事件,两台测氡仪产出的同一类干扰曲线具有基本相同的变化形态和变化趋势,呈现出同步变化特征。分析结果显示:DDL-1型测氡仪的分钟值采样记录能够捕捉到更多更完整的地下流体信息,且该仪器记录数据变化较为灵敏,能清晰地记录到明显的日变形态,观测质量优于SD-3A气氡仪。对比结果可以为测氡观测仪器的评价、数据分析、干扰排除和震前异常识别提供参考依据。

Taking the SD-3 A and DDL-1 radon measurement instruments in Well No.4 in Huailai county,we compared and analyzed the two instruments on their dynamic stability,inner-part quality,and observational curves.We found that the data produced by the two radon measurement instruments changed synchronously,which shows an identical change in shapes and trends during gas leakage test,gas sampling,and replacement of the condensing-air tubes.The results showed that the DDL-1 radon measurement instrument can record complete underground fluid information.Moreover,records on the daily variation of observation data and dynamic characteristics of the instrument are obvious.The instrument is more sensitive in data changes with a better observation quality than that of old-version SD-3 A radon measurement instrument.The comparing results can provide a basis for assessment of radon measurement instruments,data analysis,excluding interference factors,and correctly identifying the pre-earthquake anomaly information.