A built-in electrode electrical capacitance tomography sensor, wherein, the electrical capacitance tomography sensor is barrel in shape, which sequentially comprises, from inside to outside, array-distributed electrodes, an electrode insulating sleeve, a flange outer tube, an insulating tube and a signal transmission line;
- wherein, the array-distributed electrodes are N electrode sheets, each of which have the same size and consists of a measuring end and a fixed end, and N is an integer in a range from 8 to 16;
- and
- the electrode is connected to the electrical capacitance tomography signal acquisition system through the signal transmission line, and the collected capacitance data are transmitted to the electrical capacitance tomography signal acquisition system via the signal transmission line, and then transmitted to an imaging computer to complete image reconstruction.