Noise Interference Analysis of FHD Proton Magnetometer at Wenan Seismic Station
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摘要: 文安台FHD-2B质子磁力仪噪声值在2020—2021年出现地磁F分量观测数据噪声偏大。其噪声与环境温度存在高相关性，表现为冬季噪声大，夏季噪声小现象。我们依次对磁房周围环境、供电电压、接地电阻、供电线路是否漏电、探头是否漏油、工频干扰等进行排查，未能发现明显干扰源。通过研究FHD质子磁力仪的原理发现FHD质子磁力仪的配谐电容C容量会随温度变化，温度低时容量小，温度高时容量大；配谐电容C容量变化会影响振荡回路中心频率f，导致噪声增大。由于文安台FHD质子磁力仪噪声与温度有关联，我们推测FHD噪声增大可能与仪器配谐电容C容量变化有关。通过调节探头电感量L可修正配谐电容容量变化对回路中心频率F的影响。经多次实验，精细调整探头电感量L，当选定34.4 mH为探头电感量值时，发现磁F分量的噪声值明显下降，数据曲线变光滑，噪声干扰排除。
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关键词:
- FHD-2B质子磁力仪 /
- 数据噪声 /
- 电感量
Abstract: The FHD-2B proton magnetometer at Wen'an Station will have large F component noise in 2020 and 2021. There is a high correlation between noise interference and temperature, which is generally characterized by high noise in winter and low noise in summer. The surrounding environment, power supply voltage, grounding resistance, power supply line leakage, probe leakage and power frequency interference of the magnetic room were checked respectively, and no interference sources were found. By studying the principle of FHD proton magnetometer, it is found that the harmonic capacitance capacity of FHD proton magnetometer changes with temperature. The capacity is small at low temperature and large at high temperature. The change of the capacity of the harmonic capacitor will affect the center frequency of the oscillation circuit, resulting in increased noise. Since the noise interference of the FHD proton magnetometer at Wen'an Station is highly correlated with temperature, it is speculated that the noise interference may be related to the change of the harmonic capacitance capacity. We can adjust the inductance L of the probe to correct the influence of the circuit center frequency of the harmonic capacitance capacity transformation. The probe inductance was adjusted several times through experiments, and 34.4 mH was selected as the most appropriate probe inductance value. After the experiment, the noise value of F component decreased, the data curve became smooth, and the noise interference was solved.-
Key words:
- FHD-2B proton magnetometer /
- data noise /
- probe inductance
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图 2 2020年1月—2021年11月文安台FHD噪声值与台网均值对比图
Figure 2. Comparison between FHD noise value of Wen'an station and mean value of network from January 2020 to November 2021
图 3 修改不同探头电感量后的数据曲线与一阶差分曲线
Figure 3. Data curve and first-order difference curve after modifying the inductance of different probes
图 4 F分量修正电感量L前后数据曲线对比
Figure 4. Comparison of data curve before and after modifying inductance of F component
表 1 不同探头电感量各分量噪声值
Table 1. noise value of each component of inductance of different probes
探头电感量/mH F噪声值 H噪声值 D噪声值 Z噪声值 34.1 0.32 0.30 0.04 0.36 34.2 0.40 0.45 0.04 0.28 34.3 0.21 0.29 0.04 0.28 34.4 0.20 0.31 0.04 0.27 34.5 0.28 0.52 0.08 0.30 33.9 0.41 0.34 0.04 0.47 
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