High-precision ECT (Electrical Capacitance Tomography) intelligent sensor

Abstract

The invention provides a high-precision ECT (Electrical Capacitance Tomography) intelligent sensor. The intelligent sensor comprises a sensitive capacitance polar plate and a signal processing circuit board, wherein the surface of the sensitive capacitance polar plate can directly get in contact with detected fluid after being subjected to Teflon spray processing. A Teflon coating has higher heatresistance and corrosion resistance, smooth surface and stable dielectric constant, and thereby the measuring result is more stable, the application field is wider, the maintenance period of cleaningdeposited dirt is expected to be prolonged, and the recycling is possible. The signal processing circuit board is fixed on a stud provided by the sensitive capacitance polar plate and used for collecting an analog signal derived from the sensitive capacitance polar plate in the neighbourhood; and the analog signal is converted into a digital signal by processing for being transmitted to an imaging computer by a CAN (Controller Area Network) bus; and the transmission distance of the analog signal is effectively shortened, the influence of stray capacitance on the imaging effect is reduced, andthe current exciting and data acquiring task can be automatically finished after a command is received. An industrial CAN bus interface has the characteristics of strong interference resistant capability, remote transmission distance, and the like so that the imaging computer can be arranged far away from the industrial field.

Description

technical field [0001] The invention provides an ECT intelligent sensor, which is especially applied to industrial sites, has strong stray capacitance suppression capability and high signal-to-noise ratio, and is a high-precision ECT intelligent sensor capable of long-distance data transmission. Background technique [0002] As an emerging process imaging technology, electrical imaging has the characteristics of non-invasiveness, visualization, low cost, no radiation, and rapid response. It mainly includes electrical impedance imaging (EIT), capacitance imaging (ECT), and electromagnetic imaging (EMT). Among them, the principle of capacitive imaging (ECT) is to realize the imaging of the measured object by measuring the change of the capacitance value between sensitive electrodes according to the change of the dielectric constant of different measured objects. Since the change value of the measured capacitance is very weak, the influence of system stray capacitance and noise...

AI Technical Summary

Problems solved by technology

Dr. He Shijun of Tianjin University's thesis "Research and Application of Electrical Capacitance Tomography System" proposed that after unified collection of ECT data, CAN bus was used for point-to-point transmission, which improved the distance and speed of data transmission, but did not give full play to the multi-point transmission of CAN bus The advantages

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