A new type of modified wave airborne electromagnetic pulse transmitting system
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摘要: 由于在低压输入,多匝、低阻发射线圈条件下很难实现理想的方波电流脉冲,GEOTEM等国外经典的时间域航空电磁系统大都采用半正弦波发射电路来实现大磁矩发射。笔者设计了一种新型的准谐振组合波脉冲发射电路,能够在提高通断速度的同时实现近似方波的组合波脉冲发射,有利于提高航空电磁勘查系统的分辨能力。在此基础上,成功研发了一套固定翼航空电磁脉冲发射系统,可激发基频可选、脉宽可调的双极性组合波电流脉冲,电流脉冲的幅值达到650 A,峰值磁矩达到50万Am2。Abstract: It is difficult to achieve the ideal square pulse current especially with high inductor load, low loop resistance and low input voltage;therefore, time domain airborne electromagnetic systems such as GEOTEM mostly adopt the half sine wave transmitting circuit to realize the large magnetic moment of emission. This paper describes the design of a novel quasi?resonant modified pulse emission cir?cuit. The modified waveform current generated by this special transmitter with the short edge times is somewhat similar to square wave?form, the ideal wave form of broad band transient. On such a basis, a set of fix?wing airborne electromagnetic pulse transmitting system has been developed recently, whose pulse current reaches 650 A and peak moment is up to 500 000 Am2 .
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