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Resistance tomography data acquisition system based on bipolar pulse current drive

A technology of electrical resistance tomography and data acquisition systems, applied in radio wave measurement systems, electrical/magnetic exploration, measurement of resistance/reactance/impedance, etc., can solve the limitations of design principles, limited space for data acquisition speed improvement, real-time performance Unsatisfactory and other issues

Inactive Publication Date: 2004-11-10
ZHEJIANG UNIV
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Problems solved by technology

One of the main problems of the ERT system applied to the actual two-phase flow system parameter measurement is that the traditional ERT system basically uses high-frequency AC sine wave as the excitation source for triggering, which inevitably requires the introduction of a series of The link to process the AC signal consumes a lot of data acquisition time, resulting in unsatisfactory real-time performance of the system
[0004] Although the existing ERT system excited by high-frequency AC sine waves has proposed many improvements and optimization measures to speed up data acquisition, such as adopting parallel measurement and improving the filter time of the filter, etc., due to the limitation of its design principle, the data acquisition speed limited room for improvement

Method used

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  • Resistance tomography data acquisition system based on bipolar pulse current drive
  • Resistance tomography data acquisition system based on bipolar pulse current drive
  • Resistance tomography data acquisition system based on bipolar pulse current drive

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Embodiment Construction

[0019] like figure 2 The specific circuit implementation of the data acquisition system is as follows: the resistance data acquisition sensor includes 16 rectangular stainless steel electrodes, each stainless steel electrode is connected with its own resistance / voltage conversion channel, the design of each channel is completely consistent, and the channel control module Accept the channel control signal sent by the single-chip microcomputer, and transmit the excitation signal to the designated excitation electrode. The measured voltage difference of the two half cycles is subtracted from the balanced voltage value output by the digital / analog (D / A) conversion module, and then amplified by the gain programmable amplifier, and then passed through the analog / digital (A / D) conversion module. Perform analog / digital conversion and store in the microcontroller, channel selection, sample / hold control, digital / analog converter (D / A) output control, analog / digital converter (A / D) samp...

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Abstract

The invention discloses a bipolar pulse current excited resistance chromographic imaging data collecting system, and its character: in sequence, it has resistance data collecting sensor, resistance measuring module, data collecting module, data communication module and MCU control module, where the MCU control module is connected with the resistance measuring module, data collecting module, data communication module, the electrodes of the resistance data collecting sensor are connected with the input end of the resistance measuring module by high frequency screening wires. The invention implements the integration of resistance measuring circuit with data collecting system, micro-computerization of data collecting system and modularization of communication system.

Description

technical field [0001] The invention relates to a resistance tomography data acquisition system based on bipolar pulse current excitation. Background technique [0002] Electrical resistance tomography (Electrical Resistance Tomography, referred to as ERT) technology is one of the current research hotspots of two-phase flow process tomography (Process Tomography) technology. The technology has the characteristics of non-invasiveness, low cost, high speed, good safety and simple operation and maintenance, and can be applied to the parameter detection of gas-liquid and liquid-solid two-phase flow with continuous phase as conductivity. Resistance tomography originated in the 1920s, when geologists proposed the resistivity imaging technique of linear electrode arrays. In the 1970s, biomedical researchers proposed a tomographic resistivity measurement technique (Tomographic Resistivity Measurement Technique) of a circular electrode array, which was deve...

Claims

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Application Information

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IPC IPC(8): A61B5/053G01R27/02G01V3/02
Inventor 黄志尧黄海波冀海峰王保良李海青
Owner ZHEJIANG UNIV
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