CN1544959A - Resistance tomography data acquisition system based on bipolar pulse current drive - Google Patents
Resistance tomography data acquisition system based on bipolar pulse current drive Download PDFInfo
- Publication number
- CN1544959A CN1544959A CNA2003101086641A CN200310108664A CN1544959A CN 1544959 A CN1544959 A CN 1544959A CN A2003101086641 A CNA2003101086641 A CN A2003101086641A CN 200310108664 A CN200310108664 A CN 200310108664A CN 1544959 A CN1544959 A CN 1544959A
- Authority
- CN
- China
- Prior art keywords
- resistance
- module
- electrode
- sampling
- data acquisition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
The present invention relates to a kind of Electrical Resistance Tomography data acquisition system (DAS) based on the bi-directional pulse current excitation.
Background technology
Electrical Resistance Tomography (Electrical Resistance Tomography is called for short ERT) technology is one of current two-phase flow process tomographic imaging (Process Tomography) Study on Technology focus.This technology has Noninvasive, and is with low cost, and speed is fast, characteristics such as the good and Operation and Maintenance of security is simple, and can be applicable to external phase is gas-liquid, the liquid fixed double phase flow parameter detecting of electric conductivity.Electrical Resistance Tomography originates from the twenties in last century, and sand smellers have proposed resistivity imaging (Resistivity Imaging) technology of linear array.The seventies, the tomography resistivity measurement technology (Tomographic Resistivity Measurement Technique) that the biomedical researcher has proposed the circular electrode array develops into medical science ERT (Electrical Resistance Tomography) technology.To phase late 1980s, medical science ERT technology is transplanted in industrial circle, and (Process Tomography, PT) technology is a kind of to become process tomographic imaging.Because measuring object changes complicated industrial process into from the human body of being familiar with relatively, the ERT technology needs doing many work aspect the hardware and software two, comprises the variation (as having proposed the electrode array designs scheme of metal pipe-wall measuring object) of electrode array designs, the expansion of detected object resistivity distribution scope, raising of exciting current amplitude or the like.
Current, Electrical Resistance Tomography still has certain distance from industrial practical application.One of subject matter that the ERT system applies exists at present in actual two-phase flow system parameter measurement is that traditional ERT system all is that the AC sine wave of the high frequency that adopts triggers as driving source basically, this handles AC signal with regard to needing to introduce a series of link inevitably, expend a lot of data acquisition times, caused the system real time energy unsatisfactory.
Though the ERT system of existing high-frequency ac sine-wave excitation has proposed a lot of improvement and optimized Measures to accelerating acquisition speed, as adopt parallel measurement, improve the filtering time of wave filter etc., but because the limitation of its design concept, the room for promotion of acquisition speed is limited.At this problem, native system has adopted different design concepts, utilize the driving source of bidirectional pulse electric current as system, in the time period of measuring, system can be regarded as the excitation that has been subjected to direct current signal, and like this, great link consuming time just can be omitted in some traditional ERT systems, simultaneity factor has also adopted the method for parallel measurement, the raising that these measures are bigger the picking rate of data.
Summary of the invention
Provided a kind of Electrical Resistance Tomography data acquisition system (DAS) based on the bi-directional pulse current excitation order of the present invention.
It has resistance data pick-up transducers, resistance measuring module, data acquisition module, data communication module and single chip control module successively, single chip control module links to each other with resistance measuring module, data acquisition module, data communication module respectively, and the electrode of resistance data pick-up transducers links to each other with the input end of resistance measuring module by the radioshielding line.
Advantage of the present invention:
1) improvement of system incentive signal
Native system adopts the driving source of bidirectional pulse current source as system, has weakened insoluble electric polarization problem when adopting direct current signal as the driving source of system.Existing ERT system is carried out some improvement on the pumping signal.
2) higher data picking rate
Because the underexcitation electric current can be regarded direct current signal as at the data acquisition time interval, more necessary links consuming time can be omitted in the ERT system of traditional employing high-frequency ac sine-wave excitation, have simplified system so greatly.Simultaneously,, in resistance/voltage transformation module, adopted the method for parallel measurement in order further to improve acquisition speed, only need a certain exciting electrode on excitation once can obtain magnitude of voltage on all the other detecting electrodes.
3) microcomputerization of data acquisition system (DAS)
All control signals of data acquisition system (DAS) are controlled realization by computing machine fully in the system that develops both at home and abroad at present.Because the action of electronic circuit is a lot of when gathering a frame resistance data, thereby needs great amount of data transmission.Adopted the parallel interface card to realize the realization of control signal in some systems, this system requirements microcomputer must can't be realized the long-distance transmissions of signal in the very near place of distance sensor, thereby can not be suitable for for the place far away far from the scene, pulpit.Adopted the two-stage control model of computing machine and single-chip microcomputer in the native system, computing machine need only send relevant data acquisition command as the upper strata controller of system, and concrete data acquisition is finished by lower floor's controller single-chip microcomputer.Content of communciation between the single-chip data acquisition system of lower floor and the control computer on upper strata mainly is a resistivity measurements, thereby can realize the higher data picking rate under low communication speed.
4) modularization of communication system
The data communication circuit has adopted modular construction, and changing corresponding module according to the difference of communication distance in using can meet the demands.
Description of drawings
Fig. 1 is based on the Electrical Resistance Tomography data acquisition system (DAS) block scheme of bi-directional pulse current excitation;
Fig. 2 is an Electrical Resistance Tomography data acquisition system (DAS) circuit block diagram;
Fig. 3 is a resistance data pick-up transducers structural representation.
Embodiment
As shown in Figure 2, the physical circuit of this data acquisition system (DAS) is achieved as follows: the resistance data pick-up transducers comprises the stainless steel electrode of 16 rectangles, each stainless steel electrode links to each other with separately resistance/voltage transitions passage, the design of each passage is in full accord, the passage control module is accepted the channel control signals that single-chip microcomputer sends, pumping signal is sent to the exciting electrode of appointment, magnitude of voltage on remaining detecting electrode all is sampled preservation, the voltage differential signal of relevant detection electrode pair is by the output of passage control module, with the measuring voltage differences of positive and negative two semiperiods by after subtracting each other with the balanced voltage value of D/A (D/A) modular converter output, again by the program control amplification of programmable-gain amplifier, carry out mould/number conversion through mould/number (A/D) modular converter then and deposit single-chip microcomputer in, channel selecting, sample, D/A (D/A) output control, A/D converter (A/D) controlling of sampling, programmable-gain amplifier (PGA) gain is provided with etc. to be finished by single-chip microcomputer (W77E58).Mould/number conversion result delivers to upper PC by single-chip microcomputer by communication module and carries out data processing.
The numerical information of communication module transmitting-receiving serial communication.For adapting to different on-the-spot needs to data rate and distance, this instrument satisfies the needs of different transmission speeds and distance with RS232 and RS422 interface standard.The RS232 interface standard is suitable for closely, the low speed communication, and it only takies a serial ports of PC; The communication distance of RS422 interface standard is far away, and the speed piece is fit to industry spot, and it requires PC to be furnished with the RS232/RS422 converter; Only need change the communication module of instrument when adopting different communication interface.Having adopted the 16C550 chip in the native system is the communication controller of system, and the baud rate of communication can reach 921.6Kbps.For improving the interference free performance of communication system, adopted insulating power supply to power to communicating circuit.The mode that communication between computing machine and single-chip microcomputer is replied with frame realizes.Simultaneously in the communication data link layer protocol, adopt CRC-CCITT type check code, improved reliability of data transmission greatly.
The mode that communication between computing machine and single-chip microcomputer is replied with frame realizes.In order to realize the various operations of computing machine to the ERT system, design various instructions, having comprised: set balanced voltage, set the gain of PGA, set the configuration data of instrument, read to specify interelectrode resistance value, read balanced voltage, read the PGA gain, read the instrument configuration data, read the single frames resistance value, enter continuous resistance measurement state, enter single frames resistance measurement state, System self-test (checking the instrument configuration data), instrument reset (single-chip microcomputer resets), read version information, read deviser's information, write the single-chip microcomputer internal register of appointment, read the single-chip microcomputer internal register of appointment.
The Electrical Resistance Tomography data acquisition system (DAS) that this Electrical Resistance Tomography data acquisition system (DAS) is more traditional is simple in structure, and cost is low, and volume is small and exquisite, the picking rate height, and antijamming capability is strong.The real time imagery speed of this system depend primarily on the bidirectional pulse current source of system frequency, sampling/retainer sampling retention time, A/D converter and D/A converter switching time and with the communication speed of host computer.Adopted novel current source device DH901B in the native system, its excitation frequency can reach 2.5KHz, owing to adopted the parallel measurement mode, only needs two-way excitation just can record 104 measured values of a frame for 14 times simultaneously.A/D conversion and D/A conversion have all selected for use high speed device AD774 and AD667, its switching time to be respectively 8.5 μ S and 4 μ S, and through experiment test, the acquisition speed of this Electrical Resistance Tomography data acquisition system (DAS) is significantly improved, and reaches for 60 frame/seconds.If the computational data communication time, its maximum data picking rate can reach for 50 frame/seconds.
As shown in Figure 3, the resistance data pick-up transducers has sensing pipeline section 2, sensing pipeline section two ends link to each other with tested pipeline by joint flange 1, the sensor cavity inwall equidistantly has 16 rectangular channels, rectangular channel is embedded with stainless steel rectangular electrode 7, stainless steel electrode is made up of rectangular electrode sheet and stainless steel screw rod two parts, the geometric center of rectangular electrode sheet is chiseled a screw, screw in stainless steel screw rod 4 then, stainless steel electrode is drawn from the screw of sensing pipeline section, be tightened with packing ring 3 and stainless steel nut 5, fill leakproof inserts 6 with antiseep between electrode and sensing pipeline section screw, the output terminal of electrode links to each other with the conductance measurement module by the radioshielding line.
The sensing pipeline section internal diameter of resistance data pick-up transducers is 80mm, and the electrode subtended angle is that 7.16 ° of electrode slices are of a size of 5mm * 50mm, and length is 5: 8 with the ratio of pipe diameter.The sensing pipeline section of resistance data pick-up transducers adopts polythene material, the pipe range 500～1000mm of sensing pipeline section, nominal diameter 20mm～160mm, nominal maximum pressure 1.0MPa.
Claims (5)
1. Electrical Resistance Tomography data acquisition system (DAS) based on bi-directional pulse current excitation, it is characterized in that it has resistance data pick-up transducers, resistance measuring module, data acquisition module, data communication module and single chip control module successively, single chip control module links to each other with resistance measuring module, data acquisition module, data communication module respectively, and the electrode of resistance data pick-up transducers links to each other with the input end of resistance measuring module by the radioshielding line.
2. a kind of Electrical Resistance Tomography data acquisition system (DAS) according to claim 1 based on the bi-directional pulse current excitation, it is characterized in that physical circuit: the resistance data pick-up transducers comprises the stainless steel electrode of 16 rectangles, each stainless steel electrode links to each other with separately resistance/voltage transitions passage, passage control module and resistance data pick-up transducers, stimulating module, sampling/retainer 1, sampling/retainer 2 links to each other, it sends into the exciting current of bi-directional current source the exciting electrode excitation measured medium of appointment, induced voltage is by resistance/voltage transitions passage, has been sent to by the passage control module in the sampling/retainer 1 and 2 of appointment to preserve; The output terminal of sampling/retainer 1, sampling/retainer 2 connects two input ends of differential amplifier respectively, after the balanced voltage value of the measuring voltage of positive and negative two semiperiods of preserving in the sampling/retainer 1 and 2 and D/A output is subtracted each other, by the program control amplification of programmable-gain amplifier, carry out mould/number conversion through A/D converter then and deposit single-chip microcomputer in again.The control end of bi-directional current source, channel selecting module, sampling/retainer 1, sampling/retainer 2, D/A, A/D converter, programmable-gain amplifier all is connected with single-chip microcomputer, channel selecting, sampling/retainer control, D/A output control, A/D converter controlling of sampling, programmable-gain amplifier gain to be provided with etc. and finish by single-chip microcomputer, and mould/number conversion result delivers to upper PC by single-chip microcomputer by communication module and carries out data processing.
3. a kind of Electrical Resistance Tomography data acquisition system (DAS) according to claim 1 based on the bi-directional pulse current excitation, it is characterized in that said resistance data pick-up transducers: it has sensing pipeline section (2), sensing pipeline section two ends link to each other with tested pipeline by joint flange (1), the sensor cavity inwall equidistantly has 16 rectangular channels, rectangular channel is embedded with stainless steel rectangular electrode (7), stainless steel electrode is made up of rectangular electrode sheet and stainless steel screw rod two parts, the geometric center of rectangular electrode sheet is chiseled a screw, use stainless steel screw rod (4) to screw in then, stainless steel electrode is drawn from the screw of sensing pipeline section, be tightened with packing ring (3) and stainless steel nut (5), fill leakproof inserts (6) with antiseep between electrode and sensing pipeline section screw, the output terminal of electrode links to each other with the conductance measurement module by the radioshielding line.
4. a kind of Electrical Resistance Tomography data acquisition system (DAS) according to claim 3 based on the bi-directional pulse current excitation, the sensing pipeline section internal diameter that it is characterized in that said resistance data pick-up transducers is 80mm, the electrode subtended angle is that 7.16 ° of electrode slices are of a size of 5mm * 50mm, and length is 5: 8 with the ratio of pipe diameter.
5. a kind of Electrical Resistance Tomography data acquisition system (DAS) according to claim 3 based on the bi-directional pulse current excitation, the sensing pipeline section that it is characterized in that said resistance data pick-up transducers adopts polythene material, pipe range 500～the 1000mm of sensing pipeline section, nominal diameter 20mm～160mm, nominal maximum pressure 1.0MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108664 CN1241032C (en) | 2003-11-12 | 2003-11-12 | Resistance tomography data acquisition system based on bipolar pulse current drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310108664 CN1241032C (en) | 2003-11-12 | 2003-11-12 | Resistance tomography data acquisition system based on bipolar pulse current drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544959A true CN1544959A (en) | 2004-11-10 |
| CN1241032C CN1241032C (en) | 2006-02-08 |
Family
ID=34334802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310108664 Expired - Fee Related CN1241032C (en) | 2003-11-12 | 2003-11-12 | Resistance tomography data acquisition system based on bipolar pulse current drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1241032C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362341C (en) * | 2005-12-22 | 2008-01-16 | 天津大学 | Compound array sensor of ERT/ECT bimodel state imaging system |
| CN102323302A (en) * | 2011-08-16 | 2012-01-18 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN101566659B (en) * | 2009-06-02 | 2012-08-22 | 天津大学 | Multi-section process data acquisition system based on industrial standards |
| CN103471735A (en) * | 2013-09-11 | 2013-12-25 | 华南理工大学 | Power battery pack internal temperature online detection method and system |
| CN105675658A (en) * | 2016-01-13 | 2016-06-15 | 天津大学 | Electrical resistance tomography sensor with built-in conductor ring |
| WO2019087154A1 (en) * | 2017-11-03 | 2019-05-09 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
-
2003
- 2003-11-12 CN CN 200310108664 patent/CN1241032C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362341C (en) * | 2005-12-22 | 2008-01-16 | 天津大学 | Compound array sensor of ERT/ECT bimodel state imaging system |
| CN101566659B (en) * | 2009-06-02 | 2012-08-22 | 天津大学 | Multi-section process data acquisition system based on industrial standards |
| CN102323302A (en) * | 2011-08-16 | 2012-01-18 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN102323302B (en) * | 2011-08-16 | 2013-01-02 | 浙江大学 | Non-contact electrical resistance tomography data acquisition device and method |
| CN103471735A (en) * | 2013-09-11 | 2013-12-25 | 华南理工大学 | Power battery pack internal temperature online detection method and system |
| CN103471735B (en) * | 2013-09-11 | 2016-03-02 | 华南理工大学 | Power battery pack internal temperature on-line testing method and system |
| CN105675658A (en) * | 2016-01-13 | 2016-06-15 | 天津大学 | Electrical resistance tomography sensor with built-in conductor ring |
| WO2019087154A1 (en) * | 2017-11-03 | 2019-05-09 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
| US11264987B2 (en) | 2017-11-03 | 2022-03-01 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1241032C (en) | 2006-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101566659B (en) | Multi-section process data acquisition system based on industrial standards | |
| CN1319490C (en) | Analog demodulation mode type frequency-mixing bio-impedance testing system | |
| CN1723845A (en) | Digital demodulation mode type frequency-mixing bio-impedance testing system | |
| CN1241032C (en) | Resistance tomography data acquisition system based on bipolar pulse current drive | |
| CN111610229B (en) | Gas-liquid two-phase flow monitoring device, system and method | |
| CN105464953A (en) | Frequency conversion control method and device for oil-well pump combining indicator diagram with working fluid level | |
| CN105807697A (en) | Programmable universal capacitance type liquid level sensing controller and control method thereof | |
| CN111769819A (en) | Data acquisition method and system with adaptive and adjustable sampling frequency | |
| CN2651763Y (en) | Bipolar pulse current excited resistor chromatographic image data collecting system | |
| CN101650240A (en) | Detecting and analyzing apparatus for power efficiency of electric fork truck | |
| CN108037159A (en) | A kind of cytoactive detection method and device based on impedance spectrum integration feature | |
| CN202757808U (en) | Constant-flow air sampler | |
| CN2854893Y (en) | Capacitor switching monitoring device based on single-chip processor and configuration | |
| CN1664589A (en) | Two-phase flow concentration measuring apparatus and method for supersonic wave and capacitance sensors | |
| CN101526502A (en) | Portable ultrasonic surveymeter based on principle of ultrasonic diffraction time difference method | |
| CN2411482Y (en) | Procedure chromatographic analysis imaging device base on capacitance sensor | |
| CN2681144Y (en) | Conductance/voltage converter based on bipolar pulse current excitation | |
| CN1272257C (en) | Electromagnetic water treater with monitoring water quality conductivity | |
| CN2874516Y (en) | Conductivity sensor | |
| CN1793789A (en) | Electromagnetic flow sensor of non-insulated measuring pipe | |
| CN210833696U (en) | Intelligent electromagnetic flowmeter | |
| CN207007779U (en) | A kind of ultrasonic wave early warning defectoscope with positioning function | |
| CN201413367Y (en) | Multi-section process data acquisition system based on industrial standard | |
| CN206056770U (en) | Check valve acoustic emission signal acquisition system | |
| CN2821570Y (en) | Electromechanical integrated detector for digital weak electrolyte dissociation constant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060208 Termination date: 20111112 |