Design of ECT Hardware Circuit for Complex Flow
Wenqiang Su, Wei Zhang · 2024
The circuit design of the capacitive tomography system is designed to achieve high-quality imaging results and has a wide range of potential for medical, industrial and scientific applications. This paper designs A set of capacitive tomography system hardware circuit for multiphase flow detection in the chemical industry, including the design of signal excitation module to realize the generation of sinusoidal AC excitation signals with adjustable amplitude and frequency. The process of $D / A$ conversion to convert digital signals into analog electrical signals should fully consider the resolution, sampling rate, signal-to-noise ratio and other factors. Select signals within A specific frequency range and amplify them through signal processing processes such as filtering and amplifying. Design small capacitance detection circuit and data acquisition module. The detection circuit needs to have high sensitivity and stability to measure small capacitance changes, and convert analog signals into digital signals through amplification and filtering and A/D conversion to transmit to the main control chip. After the demodulation program, the sensitive field information in the voltage signal is extracted, the demodulated signal is transmitted to the computer by the USB bus transmission module, and the upper computer program is written to complete the image reconstruction function and realize the multiphase flow detection in the pipeline.