Research on ERT system denoising technology excited by bi-directional pulse current

In order to improve denosing capacity of ERT system excited by bi-directional pulse current and reduce the disturbance on measurements caused by noises, this paper makes further studies on the noises caused by the charges accumulated on the measurement electrode. 2D emulation is established for 16 electrode sensitivity field and also parameter distribution model of the ERT sensitivity field under the adjacent models. Thus, a detailed analysis is carried out on the generation of the noise and the influence on the measurements. On basis of it, we put forward a high-speed discharge circuit based on Schottky diodes. This circuit is characterized in quick discharge, adjustable interface threshold and automatically-determined polarity of the charge, etc. At the end of this paper, the emulation results of the circuit is given out, which is verified that the circuit can effectively suppress the noises generated by the charges accumulated on the measurement electrode.