地震数传电缆特性阻抗的测量

Measurement of Characteristic Impedence in Digital Seismic Signal Transmission Cable

文章说明测量地震数传电缆特性阻抗的重要性，从特性阻抗的定义入手，结合传输线理论和实际操作，总结了地震数传电缆特性的测量，说明为什么该特性阻抗通常被认为是纯电阻。文中有特性阻抗的测量概括为开短路法和反射脉冲法两类，又将前者分成单频测量和扫频测量，并把谐振法看作是开短路法扫频测量的特例，明确实施两类操作方法的要点，并指出存在的问题。

The importance is pointed out of measuring the characteristic impedance in digital seism-signal transmission cable in this paper,with performing the definition of characteristic impedance firstly and combining transmission line theory with practice,it is summarized that measurement of the characteristic impedance in digital seism-signal transmission cable,and the reason is given why the characteristic impedance is used to be as pure resistance. The author divides the method for characteristic impedance measurement into two kind briefly,one is open-short-circuit(single and sweeping frequency,especially resonance method is sweeping frequency), the other is reflected impulse, the key in practice of measurement was presented. At last some problems in current measurement practice are given out also.