CN109030572A - A kind of control method of center feed formula electrical impedance imaging electrode system - Google Patents
A kind of control method of center feed formula electrical impedance imaging electrode system Download PDFInfo
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- CN109030572A CN109030572A CN201810648008.7A CN201810648008A CN109030572A CN 109030572 A CN109030572 A CN 109030572A CN 201810648008 A CN201810648008 A CN 201810648008A CN 109030572 A CN109030572 A CN 109030572A
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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Abstract
The present invention relates to a kind of control methods of center feed formula electrical impedance imaging electrode system, electrode system includes multiple electrodes unit, and each electrode unit includes signal electrode, power electrode, wireless communication module, power module, signal control module, high-pass filter, signal excitation and measuring unit；It is as follows to the control method of each electrode unit: the signal control module of electrode unit, according to the switching of the excitation state of the extraneous wireless signal control signal electrode received and measuring state；For electrode unit under excitation state, signal excitation generates high-frequency signal with measurement module, transmits high-frequency signal to signal electrode by high-pass filter, signal electrode is made to be in excitation state；For electrode unit under measuring state, signal electrode is in measuring state, and the high-frequency excitation signal of other electrodes is transmitted to signal electrode by inner conductive tube medium, is input to signal excitation and measurement module by high-pass filter, obtains measurement result.
Description
Technical field
The center feed formula electrical impedance imaging measuring device based on wireless communication that the present invention relates to a kind of.
Background technique
Electrical impedance tomography (EIT) technology is based on a kind of process detection technique developed in Theory of Electromagnetic Field, tool
Have the advantages that non-intrusion type, real-time are high, at low cost, is widely applied in industry and medical domain.In EIT detection process, one
Group electrod-array is uniformly mounted or located at determinand boundary.In the detection process, to one or more electrodes apply electric current or
Voltage signal detects the electric signal of other electrodes, rebuilds distribution of conductivity image by image reconstruction algorithm.Since EIT is detected
In the process, the presence for requiring to have current loop is needed, so must assure that measured medium is conductive materials.
In the electric field, the propagation of different frequency electric signal is independent from each other, in multi-frequency and the measurement field domain deposited,
Corresponding band can be extracted by filtering processing, is handled while realization to each frequency band signals.DC power signal is direct
In measurement field domain, each module obtains power supply directly from electrode, moreover it is possible to reduce the complexity of outside line for load.
Wireless communication is a kind of technology propagated electromagnetic wave signal and carry out information exchange in space, wide in many fields
General use, the information exchange of multiterminal may be implemented using wireless networking, and reduce the difficulty of installation and maintenance.
Current EIT acquisition system is usually using wired mode connection electrode and EIT system.This method is actually using
In have unstability, such as interface loosen or harness damage will lead to the interruption that electrode is connect with system, influence measurement result,
And it is not easy to position the electrode to break down.From the perspective of practical application, designed EIT measuring device should meet
Claimed below: 1) conducting wire for reducing the pipe external space connects, and 2) it reduces the maintenance difficulty of sensing system and measures stability.
Summary of the invention
The application scenarios that the present invention is measured for the conveyance conduit of transport conducting medium substance provide a kind of for surveying
Measure the control method of the electrode system of the conveyed conductive fluid of horizontal pipe, it is therefore an objective to reduce leading for measurement pipeline exterior space
While line connects, realizes the independent detection of electrode, improve the operation stability of system, reduce the maintenance difficulty of system.This hair
Bright technical solution is as follows:
A kind of control method of center feed formula electrical impedance imaging electrode system, the electrode system is for measuring horizontal tube
The conveyed conductive fluid in road, including metallic rod, multiple electrodes unit, voltage source and the screen being axially fixed inside horizontal pipe
Cover cover, wherein
Each electrode unit includes a signal electrode, power electrode, wireless communication module, power module, a signal
Control module, high-pass filter, signal excitation and measuring unit；Signal control module is by the wireless communication module and outside
Boundary carries out wireless communication, and sends measurement result, according to the excitation state and measurement of the wireless signal control signal electrode received
The switching of state；Power module, including Voltage stabilizing module and low-pass filter, Voltage stabilizing module be connected to shielding case and power electrode it
Between, the output of Voltage stabilizing module is the power supply of entire electrode unit by service cable after low-pass filtering；Signal excitation and measurement
Unit is connected by the high-pass filter with signal electrode；
Voltage source connects between metallic rod and shielding case, for powering to entire electrode system；
Each signal electrode is distributed on the same pipeline section inside horizontal pipe；
Each power electrode is distributed on the same pipeline section inside horizontal pipe, close to signal electrode；To each
The control method of electrode unit is as follows:
1) the signal control module of electrode unit, according to the excitation of the extraneous wireless signal control signal electrode received
The switching of state and measuring state；
2) for electrode unit under excitation state, signal excitation generates high-frequency signal with measurement module, passes through high-pass filter
High-frequency signal is transmitted to signal electrode, signal electrode is made to be in excitation state, signal control module only feedback regulation module it is steady
Pressure condition information；
3) for electrode unit under measuring state, signal electrode is in measuring state, and the high-frequency excitation signal of other electrodes is logical
It crosses inner conductive tube medium and is transmitted to signal electrode, signal excitation and measurement module are input to by high-pass filter, filtered by amplification
Wave circuit converts the signal into digital signal eventually by analog/digital converter, obtains measurement result, signal control module
Both the pressure stabilizing status information of feedback regulation module, while also feedback measurement.
Detailed description of the invention
Fig. 1 is pipeline longitudal section schematic diagram.
Fig. 2 is cross-sectional view at radio repeater station.
Fig. 3 is that signal transmits schematic diagram.
Specific embodiment
The electrical impedance imaging for applying electrode system control method of the invention is measured with reference to the accompanying drawings and examples
Device is described in detail.
One, system structure
Measuring instrument need to be mounted on horizontal pipe in the design, and conveying substance is that conductive material (is usually led in pipeline
Electro-hydraulic body), and the substance should not have the conductive metal pipe at piping center, connect with central metal bar and at least one edge electrodes
Touching, to guarantee to form current loop.Distribution of electrodes is two layers, and one layer is current electrode, and one layer is signal electrode.Signal electrode with
Signaling module is connected, and current electrode is connected with power module, and power module is signaling module power supply by service cable, and is passed through
Working condition of the signal bus to signaling module transmission power module.
As shown, the device main component includes:
1 signal processing and communication module connect with each signal electrode, communicate with radio repeater station, and coordination electrode swashs
Encourage the switching with measuring state, comprising:
11 wireless communication modules, for controlling the transmission of the signal between radio repeater station and signal processing and communication module,
It is communicated by communication antenna with radio repeater station；
12 signal control modules, including microcontroller minimum system and state switch gate circuit, for send measurement result,
According to the switching of the excitation of the wireless signal coordination electrode received and measuring state；
13 high-pass filters are used for filtering low rate signal, high-pass filter and signal excitation and measurement module and signal
Electrode is connected.Signal is input to high-pass filter with measurement module by signal excitation under excitation state, then exports to signal
Electrode；Signal is input to high-pass filter by signal electrode under measuring state, then exports to signal excitation and measurement module；
The excitation of 14 signals and measurement module, including signal excitation and signal measurement two parts circuit, signal exciting circuit packet
Digital/analog converter (DAC), signal amplification circuit filter are included, motivates required high-frequency signal for generating.Circuitry for signal measurement
Including analog/digital converter (ADC), signal amplification circuit filter, for receiving the survey of signal under other electrode excitation states
Amount；
2 radio repeater stations, are set on shielding case, between external host and internal signal processing and communication module
Signal transmission, the communication antenna of outer end for being communicated between external host, the communication antenna in shielding case be used for it is each
Signal processing is communicated with communication module；
3 power modules are connected with each power electrode, are that neighbouring signal processing and communication module supply by service cable
Electricity, comprising:
31 Voltage stabilizing modules, required for voltage stabilization to wireless communication module 11 and signal control module 12 work
Voltage, to two module for power supply, and by signal bus to signal processing and 1 feedback regulation state of communication module (input voltage,
Input current)；
32 low-pass filters are used for filtering excitation high-frequency signal, retain supplying DC signal；
4 electrode groups share two layers, be uniformly installed on inner tube inner wall (every layer number such as 16,32,48 etc., Fig. 3 be 2 ×
The schematic diagram of 16 electrode structures), wherein one layer of each electrode connection signal processing and communication module, referred to as signal electrode 41；It is another
Each electrode of layer connects power module 3, referred to as power electrode 42；Adjacent power electrode and signal electrode is a pair；
5 support tubes are insulated hollow pipe, in the both ends of cross-shaped connection metallic rod 6；
6 metallic rods are connect with conducting wire 9, connect low frequency constant pressure source, high potential (for example, 50V)；
7 inner tubes are isolation materials, are transmitted for medium；
8 shielding cases are conductive materials, for providing the zero potential of package unit, the ground terminal of interior circuit are managed, with controllable electric
The negative potential of potential source is connected；
9 conducting wires, the transmission for positive potential of powering.
Two working principles
Working principle description is carried out in conjunction with Fig. 3.Fig. 3 show a pair of electrodes and its circuit module and EIT system in device
Information exchange schematic diagram.It in actual moving process, is initially formed: metallic rod (high potential)-pipeline conductive materials-
Power electrode-Voltage stabilizing module-shielding case (ground connection) current loop, Voltage stabilizing module by steady pressure treatment be signal processing with communicate mould
Block power supply, and signal processing and the current voltage regulation information of communication module are fed back to (comprising voltage before pressure stabilizing, Voltage stabilizing module work shape
State), to ensure that the normal work of signal processing and communication module.After signal processing and communication module, which are powered, to be started, nothing
Line communication module by radio repeater station realize with the information exchange of external host, signal control module is according to the finger of external host
It enables and corresponding excitation or detection operation is made to electrode.Signal excitation and measurement module include signal excitation and signal measurement two
Parallel circuit, circuit state are controlled by signal control module, and signal exciting circuit is synthesized by DDS, generate high frequency needed for EIT is motivated
Signal；The high-frequency signal of measurement is passed through filter and amplification by circuitry for signal measurement, is converted into counting by analog/digital converter (ADC)
Word signal.
Signal processing and communication module be used to motivate and feedback channel in high-frequency signal, can be used for the electrode of conventional method
Control, the difference of power module and controllable voltage source can be used for reflecting center to the dielectric resistance resistance between respective electrode, it is auxiliary
Help original imaging method.
System work is as follows with signals transmission:
1, it powers
Metallic rod is connected to the anode of controllable voltage source by conducting wire, and shielding case connects the cathode of controllable voltage source, at this time
Intraductal electric current flows to each power electrode from center metallic rod, and radio repeater station is individually powered by external power supply；Power electrode end
Electric signal pressure stabilizing is carried out by low-pass filter and Voltage stabilizing module, be that signal processing and communication module are powered, and to signal control
The pressure stabilizings status datas such as molding block feed back input voltage value, input current value.
2, it communicates
After signal processing and communication module are powered, wireless communication module and radio repeater station carry out information exchange, signal
Processing enters working condition with communication module；If the power electrode adjacent with signal electrode not with conducting fluid contacts or contact not
Good, power module can not power for signal processing and communication module, which does not work, and radio repeater station can not be somebody's turn to do
Electrode checking signal feeds back the electrode unit without working signal to external host.During the work time, by external host control
Excitation, via radio repeater station, is transmitted separately to each wireless communication module, wireless communication module passes through number with measuring state signal
Signal is passed into signal control module according to bus.High frequency testing result and the pressure stabilizing status information of Voltage stabilizing module are by signal
Control module is transmitted to wireless communication module, summarizes by radio repeater station, is transmitted to external host.Wherein, in excitation state
Under signal control module only feedback regulation module pressure stabilizing status information, the signal control module under measuring state had both been fed back surely
The pressure stabilizing status information of die block, while also feeding back high frequency testing result.
3, it detects
Signal control module controls the working condition of signal excitation and measurement module:
1) under excitation state, signal excitation generates high-frequency signal with measurement module, transmits high frequency by high-pass filter
Signal makes signal electrode be in excitation state to signal electrode；
2) under measuring state, signal electrode is in measuring state, and the high-frequency excitation signal of other electrodes in pipe by leading
Dielectric is transmitted to signal electrode, is input to signal excitation and measurement module by high-pass filter, by filtering and amplifying circuit, most
Digital signal is converted the signal by analog/digital converter (ADC) eventually.
Due to taking above technical scheme, have the advantage that
1) positive potential of central metal bar connection controllable voltage source, realizes the power supply of multiple modules in pipe, improves each
The replaceability of electrode；
2) since current supply circuit can be by measurement field domain, the voltage condition at electrode being connected with power supply module can be preliminary
Reflect the distribution of conductivity situation on center to electrode path, on the basis of original EIT detects signal, increases measurement
Information；
3) supply voltage source is direct current signal, mutually indepedent with EIT excitation high-frequency signal, before being placed on power supply module
The low-pass filtering module at end and the high-pass filtering module for being placed on signal processing and communication module front end can distinguish two kinds of differences
The electric signal of frequency.Original measurement mechanism is not influenced to realize；
4) each electrode and EIT system are wirelessly connected, not physically connected between each electrode module, during avoiding wired connection
Unstability, increase the substitutability of each module, reduce maintenance difficulties；
5) shielding case has function of shielding, reduces interference of the external signal to signal in pipe.
Claims (1)
1. a kind of control method of center feed formula electrical impedance imaging electrode system, the electrode system is for measuring horizontal pipe
Conveyed conductive fluid, including metallic rod, multiple electrodes unit, voltage source and the shielding being axially fixed inside horizontal pipe
Cover, wherein
Each electrode unit includes a signal electrode, a power electrode, wireless communication module, power module, signal control
Module, high-pass filter, signal excitation and measuring unit；Signal control module by the wireless communication module and it is extraneous into
Row wireless communication sends measurement result, according to the excitation state and measuring state of the wireless signal control signal electrode received
Switching；Power module, including Voltage stabilizing module and low-pass filter, Voltage stabilizing module are connected between shielding case and power electrode,
The output of Voltage stabilizing module is the power supply of entire electrode unit by service cable after low-pass filtering；Signal excitation and measuring unit
It is connected by the high-pass filter with signal electrode；
Voltage source connects between metallic rod and shielding case, for powering to entire electrode system；
Each signal electrode is distributed on the same pipeline section inside horizontal pipe；
Each power electrode is distributed on the same pipeline section inside horizontal pipe, close to signal electrode；To each electrode
The control method of unit is as follows:
1) the signal control module of electrode unit, according to the excitation state of the extraneous wireless signal control signal electrode received
With the switching of measuring state；
2) for electrode unit under excitation state, signal excitation generates high-frequency signal with measurement module, is transmitted by high-pass filter
High-frequency signal makes signal electrode be in excitation state to signal electrode, the pressure stabilizing shape of signal control module only feedback regulation module
State information；
3) for electrode unit under measuring state, signal electrode is in measuring state, and the high-frequency excitation signal of other electrodes passes through pipe
Interior conducting medium is transmitted to signal electrode, signal excitation and measurement module is input to by high-pass filter, by amplifying filtered electrical
Road converts the signal into digital signal eventually by analog/digital converter, obtains measurement result, and signal control module was both anti-
Present the pressure stabilizing status information of Voltage stabilizing module, while also feedback measurement.
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| CN201810648008.7A CN109030572B (en) | 2018-06-22 | 2018-06-22 | Control method of center power supply type electrical impedance imaging electrode system |
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| CN201810648008.7A CN109030572B (en) | 2018-06-22 | 2018-06-22 | Control method of center power supply type electrical impedance imaging electrode system |
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| CN109030572B CN109030572B (en) | 2020-08-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494936A (en) * | 2020-04-02 | 2021-10-12 | 山西农业大学 | Device and method for monitoring growth of underground tuber crops |
| CN114964570A (en) * | 2022-04-27 | 2022-08-30 | 西安交通大学 | Deformable immersion type pressure sensor based on particle material electric conduction characteristics |
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| CN102670198A (en) * | 2011-03-16 | 2012-09-19 | 德尔格医疗有限责任公司 | Method for electroimpedance tomography |
| CN102821684A (en) * | 2010-03-16 | 2012-12-12 | 斯威斯托姆公开股份有限公司 | Electrode for a scanning electrical impedance tomography device and a scanning electrical impedance tomography device |
| US9791396B2 (en) * | 2015-05-07 | 2017-10-17 | Tech4Imaging Llc | Space adaptive reconstruction technique for adaptive electrical capacitance volume tomography |
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Patent Citations (4)
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| CN1344929A (en) * | 2000-09-26 | 2002-04-17 | 中国科学院力学研究所 | Resistance chromatographic instrument for monitoring gas-liquid phase pipe flow and its monitoring method |
| CN102821684A (en) * | 2010-03-16 | 2012-12-12 | 斯威斯托姆公开股份有限公司 | Electrode for a scanning electrical impedance tomography device and a scanning electrical impedance tomography device |
| CN102670198A (en) * | 2011-03-16 | 2012-09-19 | 德尔格医疗有限责任公司 | Method for electroimpedance tomography |
| US9791396B2 (en) * | 2015-05-07 | 2017-10-17 | Tech4Imaging Llc | Space adaptive reconstruction technique for adaptive electrical capacitance volume tomography |
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| CN113494936A (en) * | 2020-04-02 | 2021-10-12 | 山西农业大学 | Device and method for monitoring growth of underground tuber crops |
| CN113494936B (en) * | 2020-04-02 | 2023-04-28 | 山西农业大学 | Underground tuber crop growth monitoring device and monitoring method |
| CN114964570A (en) * | 2022-04-27 | 2022-08-30 | 西安交通大学 | Deformable immersion type pressure sensor based on particle material electric conduction characteristics |
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