Abstract：For the traditional ECT sensors electrode-to-gap ratio (EGR) is fixed and can not be adjusted, the distance between the measuring plate and the center of the pipe cannot be changed, the measured objects position and size in the pipe can not select the appropriate electrode-to-gap ratio, and it can not get better reconstructed image. A novel sensor system with adjustable electrode-to-gap ratio is proposed. The electrode-to-gap ratio can be adjusted from 101 to 61. In order to solve the problem that this sensor system can not join the radial substrate and cause the interference of the coupling capacitances between adjacent plates, A system for adding a differential electrode between the measuring plate and the shield was designed, and the differential electrode was adjusted synchronously with the measuring electrode.. The experimental results showed that the selected electrode-to-gap ratio (EGR) would be different along with the difference of the position and the size of the measured object. This sensor system can quickly adjust the appropriate duty cycle to obtain the best imaging effect, the image error (IME) decreased to 0.25 and the correlation coefficient increased (CORR) to 0.80.
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2019, Vol. 40 
