ECT/ERT double mode-state imaging system cross-type composite array sensor

Abstract

The invention supplies a intercross type complex array sensor of ECT/ERT double mode imaging system, the sensor installed in the tested object Pipeline, it includes the same electrode number ECT electrode array and ERT electrode array which equalize, across installed in the inner/outer wall of tested object Pipeline, the electrode number is 8 to 64 in the ECT and ERT electrode array, it installed ERT electrode between every two ECT electrode; it installed shielded enclosure out of the related ERT electrode. Its beneficial effects is that it can obtain the information flow at the same time, the same location of the measured fluid when it use the sensor, at the same time, it can obtain measuring information at more direction which is benefit for raising the quality of restored two modal system imaging. When ECT electrode array works, no reference to the cut state of simulate electron switch, ERT electrode as shielded electrode would not interfere ECT electrode array working, on the contrary ERT electrode could reduce the dynamic range of the measured capacitance, and benefit for measuring ECT system, the reverse is true.

Description

technical field [0001] The invention relates to an electrical imaging technology, in particular to a cross-type composite array sensor applied to an ECT / ERT dual-mode imaging system. Background technique [0002] Process Tomography (PT) technology is a multiphase flow parameter detection technology developed in recent years. It can obtain the state information of the measured object in a non-contact or non-invasive manner, and has the characteristics of visualization. At present, PT technologies mainly include optical imaging, radiography, nuclear magnetic resonance imaging, ultrasound imaging and electrical imaging. Among them, Electrical Capacitance Tomography (ECT) and Electrical Resistance Tomography (ERT) are process imaging technologies developed in the 1980s, and are the most mature two electrical imaging technologies. Its low cost, simple device, no radiation and real-time visualization have attracted the attention of many research institutions in various countries....

AI Technical Summary

Problems solved by technology

When the ECT electrode is working, the ERT electrode is in the disconnected state, but there is still a small leakage current (nA level) when the analog electronic switch is turned off, which destroys the assumption that there is no charge distribution in the ECT sensitive field, and the leakage current will affect the The measurement of the ECT system causes a large error

In addition, this current is not stable, and its influence cannot be eliminated by means of calibration

Therefore, this composite array sensor has high requirements on the hardware system, and the turn-off performance of the analog electronic switch will directly affect the signal-to-noise ratio of the system

Images