| 摘要 |
A method and apparatus for generating an electromagnetic (EM) field from a sub-sea source is disclosed. A sub-sea source 200 includes a step-down transformer 201 coupled to receive a sinusoidal source wave via a tow cable 150, and is further coupled to output a sinusoidal wave to a silicon-controlled rectifier (SCR) circuit 205. A control circuit (206) coupled to the SCR circuit (205) is configured to selectively activate various ones of the SCRs therein in order to control a portion of the sinusoidal wave that is rectified. The output current provided by the SCR is determined by the portion of the sinusoidal wave that is rectified thereby. The output current is provided to electrodes 215 coupled to the sub-sea source, and the output current is passed therebetween. The strength of the EM field is based on the output current. |
