地震勘探节点采集系统设计的要点
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岩巍
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Key points of the design of a nodal acquisition system for seismic exploration
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YAN Wei
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表2 地震仪器等效输入噪声
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Table 2 Equivalent input noise of seismic instruments
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| 采样间隔/ms | 前放增益/dB | 最大等效输入噪音/μV | | A级 | B级 | C级 | | 0.25 | 0 | ≤5 | ≤20 | ≤60 | | 12 | ≤1 | ≤5 | ≤15 | | 24 | ≤0.4 | ≤1.3 | ≤4 | | 36 | ≤0.1 | ≤0.5 | ≤1 | | 0.5 | 0 | ≤0.8 | ≤3 | ≤3 | | 12 | ≤0.2 | ≤0.8 | ≤1.5 | | 24 | ≤0.1 | ≤0.35 | ≤0.6 | | 36 | ≤0.06 | ≤0.3 | ≤0.5 | | 1 | 0 | ≤0.5 | ≤2 | ≤3 | | 12 | ≤0.15 | ≤0.6 | ≤0.75 | | 24 | ≤0.05 | ≤0.2 | ≤0.36 | | 36 | ≤0.04 | ≤0.15 | ≤0.3 | | 2 | 0 | ≤0.4 | ≤1.5 | ≤1.6 | | 12 | ≤0.1 | ≤0.4 | ≤0.45 | | 24 | ≤0.05 | ≤0.2 | ≤0.25 | | 36 | ≤0.04 | ≤0.13 | ≤0.22 | | 4 | 0 | ≤0.5 | ≤1 | ≤1.5 | | 12 | ≤0.07 | ≤0.3 | ≤0.4 | | 24 | ≤0.04 | ≤0.15 | ≤0.2 | | 36 | ≤0.03 | ≤0.1 | ≤0.15 |
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