Portable capacitance tomography measuring device

Abstract

The invention relates to a portable capacitance tomography measuring device. The device is characterized by mainly comprising five parts, including a power module (1), a clock and control module (2),a signal generation module (3), a capacitance measurement module (4) and a data acquisition and transmission module (5), wherein the modules of the circuit are uniformly connected with a standard businterface and are powered and communicated through an industry standard bus, each module includes a corresponding simulation circuit and a digital logic circuit, the power module (1) is composed of alithium battery and a power management circuit, the clock and control module (2) is composed of a crystal oscillator circuit, a control clock and a switch circuit, the signal generation module (3) iscomposed of a lookup table register and a digital-to-analog conversion circuit, the capacitance measurement module (4) is composed of a current-voltage conversion circuit and a digital demodulator, and the data acquisition and transmission module (5) is composed of an on-chip storage circuit and a universal serial bus communication circuit.

Description

technical field [0001] The invention relates to a portable capacitance tomography measuring device, which belongs to the field of distributed parameter measurement. Background technique [0002] Electrical Capacitance Tomography (ECT) technology is a visual technique used to measure the distribution of dielectric constant in the measured field, and is often used in the monitoring of multiphase flow processes. It inverts the dielectric constant / conductivity distribution in the measured field by measuring the capacitance / electrical impedance value at the boundary of the measured field, and then obtains the distribution of substances corresponding to different dielectric constants. Compared with the traditional parameter detection technology, ECT technology has the following advantages: ① non-invasive, does not destroy the field distribution of the measured object; ② low-voltage AC excitation, no radiation, safe; ③ no need for mechanical scanning, fast response, high real-time ...

AI Technical Summary

Problems solved by technology

However, existing electrical capacitance tomography measurement systems are limited by power consumption and require an external linear power supply

Due to the large size and weight of the linear power supply, the ECT system is not yet portable

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