CN103162093A - Device and method for data acquisition of oil pipeline flux leakage detector - Google Patents
Device and method for data acquisition of oil pipeline flux leakage detector Download PDFInfo
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- CN103162093A CN103162093A CN2013101036985A CN201310103698A CN103162093A CN 103162093 A CN103162093 A CN 103162093A CN 2013101036985 A CN2013101036985 A CN 2013101036985A CN 201310103698 A CN201310103698 A CN 201310103698A CN 103162093 A CN103162093 A CN 103162093A
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Abstract
A data acquisition device for an oil pipeline flux leakage detector comprises a sensor array, an analog-digital conversion module, a level conversion circuit, a CPLD module and a power circuit. An input end of the sensor array is connected with a detected flux leakage field, a signal output end of the sensor array is connected with a signal input end of the analog-digital conversion module, a signal output end and a control end of the analog-digital conversion module are both connected with a signal input end of the level conversion module, a signal input end of the level conversion module is respectively connected with a signal input end and a control end of the CPLD module, an output end of the power circuit is respectively connected with the sensor array, the analog-digital conversion module, the level conversion circuit and the CPLD module. The data acquisition device for the oil pipeline flux leakage detector achieves the conversion from a three-axis analog signal acquired by the sensor array to a digital signal and transmits the digital signal to the CPLD module, the CPLD module caches the digital signal and transmits the digital signal to the next level, flux leakage detection precision can be improved, and tiny pipe wall defects further can be detected.
Description
Technical field
The present invention relates to electronic information technical field, be specifically related to a kind of data acquisition unit for the oil transport pipeline flux leakage detector and method.
Background technique
Long distance pipeline is the major way of oil, natural gas transportation.The basic demand that oil and gas pipes is carried is safety, efficient.Yet the pipeline leakage accident caused due to reasons such as burn into wearing and tearing, accidental injuries happens occasionally.Therefore, the informationization of pipe detection analysis and Control technology research is for the industrial development important in inhibiting.
Yet existing flux leakage detector is because components and parts are numerous, complex structure causes its inefficiency, picking rate is slow, thereby testing precision is low, can not detect the fine defects of pipeline.The energy consumption caused because components and parts are numerous is too high also make detector in the situation that the limited operating time of power supply electric energy relatively short.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of data acquisition unit for the oil transport pipeline flux leakage detector and method.
Technological scheme of the present invention is:
A kind of data acquisition unit for the oil transport pipeline flux leakage detector, comprise sensor array, analog-to-digital conversion module, electrical level conversion circuit, CPLD module and power circuit; CPLD (Complex Programmable Logic Device) is CPLD;
The input end of described sensor array connects the leakage magnetic field detected, the signal output part of sensor array connects the signal input part of analog-to-digital conversion module, the magnetic leakage signal of the analog amount form that analog-to-digital conversion module receiving sensor array generates according to the leakage magnetic field detected, the signal output part of analog-to-digital conversion module and control end all connect the signal input part of level switch module, and level switch module receives the magnetic leakage signal of analog-to-digital conversion module according to the digital quantity form after the magnetic leakage signal conversion of analog amount form; The signal output part of level switch module connects respectively signal input part and the control end of CPLD module, the CPLD module receives the mileage wheel signal of oil transport pipeline flux leakage detector and the magnetic leakage signal of the digital quantity form that level switch module is exported, and the output terminal of power circuit is connecting sensor array, analog-to-digital conversion module, electrical level conversion circuit and CPLD module respectively.
Described sensor array is shown three groups, be respectively radial transducer array, axial sensor array and circumferential sensor array, radial transducer array, axial sensor array and circumferential sensor array are surveyed respectively radially leakage magnetic field, axial leakage field and the circumferential leakage magnetic field of oil transport pipeline.
Described CPLD module is for sending data acquisition signal according to mileage wheel signal to analog-to-digital conversion module.
Adopt the described data acquisition unit for the oil transport pipeline flux leakage detector to carry out the method for data capture, comprise the steps:
Step 1: the oil transport pipeline flux leakage detector is started working;
Step 2: each sensor array real-time detection submarine pipeline radially, axially, circumferential leakage magnetic field generate magnetic leakage signal;
The mileage wheel signal real-time sampling of step 3:CPLD module to the oil transport pipeline flux leakage detector;
Step 4: judge that whether mileage wheel signal is accurate: be, directly perform step 5, no, mileage wheel signal is revised, then perform step 5;
Step 5: judge whether mileage wheel signal meets interrupt condition: be to perform step 6; No, go to step 3;
Step 6:CPLD module sends data acquisition signal to analog-to-digital conversion module, control analog-to-digital conversion module to the submarine pipeline of sensor array column-generation radially, axially, circumferential magnetic leakage signal carries out the AD conversion, and by the CPLD module, the data of analog-to-digital conversion module output carried out to buffer memory;
Step 7: by the submarine pipeline that collects radially, axially, circumferential leakage magnetic field data transmission is to the storage of oil transport pipeline flux leakage detector.
Beneficial effect:
For the existing shortcoming that the flux-leakage detection method coverage scale is low, testing precision is low, the present invention realizes the transformation to digital signal of three axle analogue signals that sensor array collects by analog-to-digital conversion module, and by digital signal transfers to the CPLD module, the CPLD module carries out after buffer memory passing to next stage by this digital signal.This device has the performance of high speed acquisition, and can gather three axis signals, has increased the data capture amount, therefore can improve the Magnetic Flux Leakage Inspecting precision, and then trickleer wall defects can be detected.In addition, owing to adopting sensor array to carry out the leakage magnetic field sampling and analog-to-digital conversion module carries out analog-to-digital conversion, without using the devices such as signal amplifications, filtering, reduced the power consumption of system, in the situation that the limited work that can be for more time of power supply electric energy.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of the data acquisition unit for the oil transport pipeline flux leakage detector of the specific embodiment of the invention;
Fig. 2 is the flow chart of the collecting method for the oil transport pipeline flux leakage detector of the specific embodiment of the invention;
Fig. 3 is the analog-to-digital conversion module of the specific embodiment of the invention and the circuit catenation principle figure of level switch module;
Fig. 4 is the circuit theory diagrams of the CPLD module of the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.
As shown in Figure 1, the data acquisition unit for the oil transport pipeline flux leakage detector of present embodiment, comprise sensor array, analog-to-digital conversion module, electrical level conversion circuit, CPLD module and power circuit; CPLD (Complex Programmable Logic Device) is CPLD;
The input end of sensor array connects the leakage magnetic field detected, the signal output part of sensor array connects the signal input part of analog-to-digital conversion module, the magnetic leakage signal of the analog amount form that analog-to-digital conversion module receiving sensor array generates according to the leakage magnetic field detected, the signal output part of analog-to-digital conversion module and control end all connect the signal input part of level switch module, and level switch module receives the magnetic leakage signal of analog-to-digital conversion module according to the digital quantity form after the magnetic leakage signal conversion of analog amount form; The signal output part of level switch module connects respectively signal input part and the control end of CPLD module, the CPLD module receives the mileage wheel signal of oil transport pipeline flux leakage detector and the magnetic leakage signal of the digital quantity form that level switch module is exported, and the output terminal of power circuit is connecting sensor array, analog-to-digital conversion module, electrical level conversion circuit and CPLD module respectively.
Sensor array is shown three groups, be respectively radial transducer array, axial sensor array and circumferential sensor array, radial transducer array, axial sensor array and circumferential sensor array are surveyed respectively radially leakage magnetic field, axial leakage field and the circumferential leakage magnetic field of oil transport pipeline.
The CPLD module is for sending data acquisition signal according to mileage wheel signal to analog-to-digital conversion module.
Form three groups of sensor arraies by 12 A1321 high-precision hall sensors, every group of sensor array comprises four Hall transducers, three groups of sensor arraies are respectively radial transducer array, axial sensor array and circumferential sensor array, utilize the magnetic sensitive characteristic of Hall transducer, survey respectively radially, axially, circumferential leakage magnetic field generate the magnetic leakage signal of analog amount form, analogue signal is passed to analog-to-digital conversion module.Each sensor has 3 pins, and wherein No. 0 pin connects the 5V power supply, No. 1 pin ground connection, and No. 2 pins are signal output part.
The circuit of analog-to-digital conversion module and level switch module connects as shown in Figure 3.
The analog-to-digital conversion module core is 28 Channel 12-Bit serial output high-speed & resolution ADC ADS7844, reception is by the analogue signal of sensor array column-generation, carry out the conversion to digital signal by analogue signal, digital signal transfers, to the CPLD module, and is received to the control signal that the CPLD module is sent.Each ADS7844 has 8 signal input pins, wherein 6 are connected with the signal output part of sensor as the signal input pin, each ADS7844 has 1 serial signal output pin and 4 control pins, and with 1 road electrical level conversion circuit, be connected respectively, reception is by the analogue signal of sensor array column-generation, carry out the conversion to digital signal by analogue signal, digital signal transfers, to the CPLD module, and is received to the control signal that the CPLD module is sent.
Level switch module consists of 10 road electrical level conversion circuits, and wherein two resistance of every 1 route are in series, and the other end of one of them resistance is as signal input part, and the other end of another resistance is connected with the 5V power supply, and two resistance are respectively 200
and 10K
, completing the level conversion between analog-to-digital conversion module and CPLD module by these two pull-up resistors, signal output part is drawn by the centre of two resistance, with signal input and the control end of CPLD module, is connected.
The CPLD module plays controls the AD conversion, the effect of being responsible for processing the collection of 12 circuit-switched data and sending to next stage, it is the core of whole data acquisition circuit, reception is processed digital signal afterwards from analog-to-digital conversion module and through level switch module, digital signal is carried out to buffer memory, and by digital signal transfers to next stage, the CPLD module is sent the interrupt signal that control signal the reception of analog-to-digital conversion module are taken turns from mileage simultaneously, the CPLD module is sent the control signal to analog-to-digital conversion module according to interrupt mode simultaneously, the mode that employing is interrupted based on displacement is controlled the AD conversion and data are processed.
The circuit theory of CPLD module as shown in Figure 4.
The CPLD module is comprised of CPLD chip EPM240T100C5, crystal oscillation circuit, JTAG mouth P7 and electric capacity, resistance, is the core of whole data acquisition circuit, and it plays a part to control the AD conversion, is responsible for the collection of 12 circuit-switched data and sends to next stage; The CPLD chip is totally 100 pins, 10 pins of CPLD chip are as the signal input and control pin, 8 direct ground connection of pin, 8 pins connect the 3.3V power supply by filter capacitor respectively, 3 pins receive the interrupt signal from the mileage wheel, the clock pulse signal provided by crystal oscillation circuit is provided as clock pulse input terminal 1 pin, and 1 pin is that the signal output pin is connected with data output interface, and 4 pins are connected with JTAG mouth P7.1 pin of JTAG mouth P7 directly connects the 3.3V power supply, 2 direct ground connection of pin, 3 pins not only had been connected with the 3.3V power supply but also had been connected with the pin of CPLD by resistance, 1 pin not only passes through resistance eutral grounding but also is connected with the pin of CPLD, 3 pins are unsettled, as shown in Figure 4, 85, No. 100 pins are the signal input pin, the electrical level conversion circuit signal output part corresponding with ADS7844 signal output pin connects, 81, 82, 83, 84, 96, 97, 98, No. 99 pins are the control signal pin, controlling with ADS7844 the electrical level conversion circuit signal output part that pin is corresponding connects, 10, 11, 32, 46, 60, 65, 79, and No. 93 pin ground connection, 9, 13, 31, 45, 59, 63, 80, No. 94 pin is 0.1 by the filter capacitor resistance respectively
c12, C13, C14, C15, C16, C17, C18, C19 connect the 3.3V high level, 22,23,24, No. 25 pins are connected with 5,9,1, No. 3 pins of JTAG mouth P7 respectively, 76,77, No. 78 pins receive the interrupt signal from the mileage wheel, No. 64 pins receive as clock signal input terminal the CLK clock that the frequency that provided by crystal oscillation circuit is 50MHz, No. 41 pins are that the signal output pin is connected with data output interface, and all the other pins are unsettled, No. 1 pin of crystal oscillation circuit X1 not only is connected with the 5V power supply but also pass through 0.1
capacitor C 23 ground connection, No. 2 pin is unsettled, No. 3 pin passes through 10K
resistance R 4 output frequencies be 50MHz pulse, No. 4 pin ground connection, No. 1 pin of JTAG mouth P7 had both passed through 10K
resistance R 8 ground connection with No. 24 pins of CPLD, be connected again, No. 2 pins and No. 10 pin common grounds, No. 3 pin had both passed through 10K
resistance R 8 connect the 3.3V power supplys and be connected with No. 25 pins of CPLD again, No. 4 pin connection 3.3V power supplys, No. 5 pin had both passed through 10K
resistance R 5 connect the 3.3V power supplys and be connected with No. 22 pins of CPLD again, 6,7, No. 8 pin is unsettled, No. 9 pin had both passed through 10K
resistance R 6 be connected with the 3.3V power supply and be connected with No. 23 pins of CPLD.
Power circuit is for providing the required 5V of whole data acquisition circuit and 3.3V power supply.
The mode detected in adopting is surveyed the tube wall defect situation, flux leakage detector is installed in oil transport pipeline tube wall is detected.Two magnet are housed as magnetic pole in detection unit, can be by the tube wall magnetization at place, the location, if tube wall does not have defect, the magnetic line of force is uniformly distributed in tube wall.If there is defect in pipeline, wall cross-section reduces, and the fault location magnetic resistance increases, and flux path narrows down, and the magnetic line of force deforms, and the part magnetic line of force passes the tube wall both sides and produces leakage magnetic field.By the detection to tube wall magnetic induction intensity, can judge the defect existence of tube wall.
The data acquisition unit for the oil transport pipeline flux leakage detector of present embodiment is application and flux leakage detector, and the leakage magnetic field of the tube wall of the oil transport pipeline detected according to this data acquisition unit, judge tube wall leakage field situation.
Adopt the above-mentioned data acquisition unit for the oil transport pipeline flux leakage detector to carry out the method for data capture, comprise the steps:
Step 1: the oil transport pipeline flux leakage detector is started working;
Step 2: each sensor array real-time detection submarine pipeline radially, axially, circumferential leakage magnetic field generate magnetic leakage signal;
The mileage wheel signal real-time sampling of step 3:CPLD module to the oil transport pipeline flux leakage detector;
Step 4: judge that whether mileage wheel signal is accurate: be, directly perform step 5, no, mileage wheel signal is revised, then perform step 5;
In the detector running, there are some or a plurality of mileage wheels that " skidding " phenomenon occurs, think that this mileage wheel signal is inaccurate, need to mileage wheel signal, be revised as the case may be, for example the wheel of the mileage in the oil transport pipeline flux leakage detector has three, if " skidding " phenomenon occurs in one or two mileage wheels, utilize all the other normal mileage wheel signals to be revised it, if the signal obtained from three mileage wheels all the deviation outside the error permission occurs with the normal value collected before, it is revised execution step 6 after revising simultaneously;
Step 5: judge whether mileage wheel signal meets interrupt condition: be to perform step 6; No, go to step 3;
The operating time that completes one-time detection of oil transport pipeline flux leakage detector is divided into N cycle, and it is that mileage wheel signal meets interrupt condition that detector often reaches one-period;
Step 6:CPLD module sends data acquisition signal to analog-to-digital conversion module, control analog-to-digital conversion module to the submarine pipeline of sensor array column-generation radially, axially, circumferential magnetic leakage signal carries out the AD conversion, and by the CPLD module, the data of analog-to-digital conversion module output carried out to buffer memory;
Step 7: by the submarine pipeline that collects radially, axially, circumferential leakage magnetic field data transmission is to the storage of oil transport pipeline flux leakage detector.
Claims (4)
1. the data acquisition unit for the oil transport pipeline flux leakage detector, is characterized in that: comprise sensor array, analog-to-digital conversion module, electrical level conversion circuit, CPLD module and power circuit;
The input end of described sensor array connects the leakage magnetic field detected, the signal output part of sensor array connects the signal input part of analog-to-digital conversion module, the magnetic leakage signal of the analog amount form that analog-to-digital conversion module receiving sensor array generates according to the leakage magnetic field detected, the signal output part of analog-to-digital conversion module and control end all connect the signal input part of level switch module, and level switch module receives the magnetic leakage signal of analog-to-digital conversion module according to the digital quantity form after the magnetic leakage signal conversion of analog amount form; The signal output part of level switch module connects respectively signal input part and the control end of CPLD module, the CPLD module receives the mileage wheel signal of oil transport pipeline flux leakage detector and the magnetic leakage signal of the digital quantity form that level switch module is exported, and the output terminal of power circuit is connecting sensor array, analog-to-digital conversion module, electrical level conversion circuit and CPLD module respectively.
2. the data acquisition unit for the oil transport pipeline flux leakage detector according to claim 1, it is characterized in that: described sensor array is shown three groups, be respectively radial transducer array, axial sensor array and circumferential sensor array, radial transducer array, axial sensor array and circumferential sensor array are surveyed respectively radially leakage magnetic field, axial leakage field and the circumferential leakage magnetic field of oil transport pipeline.
3. the data acquisition unit for the oil transport pipeline flux leakage detector according to claim 1 is characterized in that: described CPLD module is for sending data acquisition signal according to mileage wheel signal to analog-to-digital conversion module.
4. adopt the data acquisition unit for the oil transport pipeline flux leakage detector claimed in claim 1 to carry out the method for data capture, it is characterized in that: comprise the steps:
Step 1: the oil transport pipeline flux leakage detector is started working;
Step 2: each sensor array real-time detection submarine pipeline radially, axially, circumferential leakage magnetic field generate magnetic leakage signal;
The mileage wheel signal real-time sampling of step 3:CPLD module to the oil transport pipeline flux leakage detector;
Step 4: judge that whether mileage wheel signal is accurate: be, directly perform step 5, no, mileage wheel signal is revised, then perform step 5;
Step 5: judge whether mileage wheel signal meets interrupt condition: be to perform step 6; No, go to step 3;
The working procedure that completes one-time detection of oil transport pipeline flux leakage detector is divided into N cycle, and it is that mileage wheel signal meets interrupt condition that detector often reaches one-period;
Step 6:CPLD module sends data acquisition signal to analog-to-digital conversion module, control analog-to-digital conversion module to the submarine pipeline of sensor array column-generation radially, axially, circumferential magnetic leakage signal carries out the AD conversion, and by the CPLD module, the data of analog-to-digital conversion module output carried out to buffer memory;
Step 7: by the submarine pipeline that collects radially, axially, circumferential leakage magnetic field data transmission is to the storage of oil transport pipeline flux leakage detector.
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| CN103575767A (en) * | 2013-11-23 | 2014-02-12 | 清华大学 | Electronic recorder unit of oil and gas pipeline defect inner-detector |
| CN103954683A (en) * | 2014-05-16 | 2014-07-30 | 北京理工大学 | Reconfigurable modular electromagnetic array sensor |
| CN104500982A (en) * | 2014-11-24 | 2015-04-08 | 北京华航无线电测量研究所 | Multichannel magnetic sensor detection and data collection circuit |
| CN104514987A (en) * | 2014-12-19 | 2015-04-15 | 清华大学 | Three-dimensional pipeline flux leakage imaging defect quantizing method |
| CN105866714A (en) * | 2016-05-17 | 2016-08-17 | 深圳市智信精密仪器有限公司 | Magnetic field intensity detecting suite |
| CN104235619B (en) * | 2014-08-14 | 2017-01-25 | 重庆大学 | fluid pipeline leakage state identification method |
| CN109491276A (en) * | 2017-09-11 | 2019-03-19 | 清华大学 | A kind of oil-gas pipeline internal detector data receiver and storage device |
| CN110460735A (en) * | 2019-08-05 | 2019-11-15 | 上海理工大学 | Large format scanner control system based on line array CCD |
| CN112130502A (en) * | 2020-09-24 | 2020-12-25 | 中石油西北联合管道有限责任公司 | Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector |
| CN112198826A (en) * | 2020-10-14 | 2021-01-08 | 中国石油大学(北京) | Submarine pipeline spiral excitation data acquisition device and method |
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| CN109491276A (en) * | 2017-09-11 | 2019-03-19 | 清华大学 | A kind of oil-gas pipeline internal detector data receiver and storage device |
| CN110460735A (en) * | 2019-08-05 | 2019-11-15 | 上海理工大学 | Large format scanner control system based on line array CCD |
| CN112130502A (en) * | 2020-09-24 | 2020-12-25 | 中石油西北联合管道有限责任公司 | Three-axis data acquisition system and method for pipeline magnetic flux leakage internal detector |
| CN112198826A (en) * | 2020-10-14 | 2021-01-08 | 中国石油大学(北京) | Submarine pipeline spiral excitation data acquisition device and method |
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