CN103499022A - Sensor for distinguishing whether corrosion defects belong to inner surface of pipeline or outer surface of pipeline - Google Patents
Sensor for distinguishing whether corrosion defects belong to inner surface of pipeline or outer surface of pipeline Download PDFInfo
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- CN103499022A CN103499022A CN201310460762.5A CN201310460762A CN103499022A CN 103499022 A CN103499022 A CN 103499022A CN 201310460762 A CN201310460762 A CN 201310460762A CN 103499022 A CN103499022 A CN 103499022A
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Abstract
The invention provides a sensor for distinguishing whether corrosion defects belong to the inner surface of a pipeline or the outer surface of the pipeline. The input end of an amplification filter circuit is connected with a detection coil of a detection probe, the signal generating output end of an integration signal generating and processing circuit is connected with an exciting coil of the detection probe, the signal processing input end of the integration signal generating and processing circuit is connected with the output end of the amplification filter circuit, a data storage circuit is connected with the signal processing output end of the integration signal generating and processing circuit, the amplification filter circuit, the integration signal generating and processing circuit and a power supply battery pack are arranged in a shielding box, the eddy-current effect can be produced in the wall pipe of the oil and gas pipeline under the action of an alternating-current excited electromagnetic field sent out by the exciting coil, and therefore electromagnetic induction signals received by the detection coil on the portions, with the corrosion defects, of the inner surface of the pipeline can be different from signals on other portions, electromagnetic induction signals received by the detection coil on different portions of the pipeline are recorded and compared, the distinguishing of the detects on the inner surface of the pipeline and the outer surface of the pipeline can be achieved, and the sensor has the advantages of being small in size, high in detection accuracy and the like.
Description
Technical field
The present invention relates to oil and gas pipes Techniques in Electromagnetic Measurement field, particularly a kind of sensor of distinguishing pipeline inner and outer surface corrosion default.
Background technique
Oil and gas pipes is as the transmission facilities of oil and natural gas, be subject to carry in external environment and pipeline the corrosive action of oil gas, the pipeline inner and outer surface all corrosion default may occur, oil-gas pipeline safety is on the hazard, need to carries out in time defects detection and determine to take corresponding pipe-line maintenance measure according to testing result.Oil and gas pipes defect inspection method commonly used is to adopt detecting method in the oil and gas pipes defect and magnetic leakage, and detector moves with the oil gas transmission medium in oil and gas pipes, detects and store the pipeline defect information.The Magnetic Flux Leakage Inspecting sensor can effectively detect the corrosion default that tube wall exists, but can not distinguish defect, be internal surface or the outer surface at pipeline, and the maintenance policy that the inner and outer surface defect of pipeline is adopted is different, therefore, being necessary to distinguish the oil and gas pipes defect is internal surface or the outer surface at pipeline.
Chinese patent application 201110210589.4 discloses a kind of pipeline inner and outer surface defect detecting device based on far-field eddy, this device is used magnetoresistance device, receive the far-field eddy signal of reflection pipeline inner and outer surface defect in far-field region, data processing module is for the electrical signal of magnetoresistance device output, the stimulating module of usining provides excitation pulse to ask phase difference as the reference signal, obtain reflecting the data of pipeline inner and outer surface defect, this patented method can effectively detect the defect of pipeline inner and outer surface, but can not distinguish defect is internal surface or the outer surface at pipeline.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of sensor of distinguishing pipeline inner and outer surface corrosion default, fast response time, testing precision are high, and can distinguish oil and gas pipes defect defect that internal detector detects is at inner surface of pipeline or outer surface.
In order to achieve the above object, the technological scheme that the present invention takes is:
A kind of sensor of distinguishing pipeline inner and outer surface corrosion default, comprise detect probe 10, detect probe 10 comprises drive coil and Test coil, drive coil is for sending ac-excited electromagnetic field, the electromagnetic signal that Test coil induces for detection of tested tube wall, the input end of filtering and amplifying circuit 20 is connected by shielded cable with the Test coil of detect probe 10, for the electrical signal to detect probe output, amplified and filtering, integrated signal occurs and the signal generation output terminal of processing circuit 30 is connected with the drive coil of detect probe 10, send the simple alternating current excitation pulse for the drive coil to detect probe 10, integrated signal occurs and the signal processing input end of processing circuit 30 is connected with the output terminal of filtering and amplifying circuit 20, for reception & disposal, amplify and filtered electrical signal, data storage circuitry 40 occurs with integrated signal and the signal processing output terminal of processing circuit 30 is connected, the detection data that complete in order to stores processor, by supplying cell group 50, to sensor circuit, power, filtering and amplifying circuit 20, integrated signal generation and processing circuit 30 and supplying cell group 50 are arranged in same shielding box 60.
Described integrated signal occurs and processing circuit 30 adopts MAX1452 integrated signal process chip, its signal processing method is, the sine wave exciting signal that flows to detect probe 10 drive coils is made to scale operation with the electrical signal that is received in filtering and amplifying circuit 20, obtain the DC signal of approximately constant, the fluctuation situation of this DC signal value has reflected the situation of change of probe and inner surface of pipeline distance, and whether the corrosion default of inner surface of pipeline arranged.
Described data storage circuitry 40 is used the NandFlash storage to carry out the data storage.
The sensor of the differentiation pipeline inner and outer surface corrosion default that the present invention is designed has plurality of advantages: owing to adopting high performance integrated signal process chip, make sensor of the present invention there is structure and mounting arrangements is simple, volume is little, fast response time, the testing precision advantages of higher.
Structure and mounting arrangements are simple, volume is little, be convenient to be arranged on the interior detection facility of various pipes defect, fast response time, testing precision is high, be applicable under the motion conditions of 0m/s～10m/s, pipeline inner and outer surface corrosion default is detected to differentiation, and can detect that to be greater than 5mm * 5mm * 1mm(long * wide * dark) the inside corrosion defect, and the defect that can be greater than 2mm with residual thickness in the pipeline outer wall defect is effectively distinguished.
The accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is detect probe wiring schematic diagram of the present invention.
Fig. 3 is the filtering and amplifying circuit schematic diagram of testing signal of the present invention.
Fig. 4 is that integrated signal of the present invention occurs and the processing circuit schematic diagram.
Embodiment
Describe the present invention in detail below in conjunction with drawings and Examples.
As shown in Figure 1, a kind of sensor of distinguishing pipeline inner and outer surface corrosion default, comprise: detect probe 10, filtering and amplifying circuit 20, integrated signal occur and processing circuit 30 and data storage circuitry 40, detect probe 10 comprises two groups of coils, be respectively drive coil and inductor coil, as shown in Figure 2, drive coil and integrated signal occur and processing circuit 30 joins, for generation of the space alternating electromagnetic field; Inductor coil and filtering and amplifying circuit 20 join, the electromagnetic signal for detection of tested pipeline under eddy current effect, and induce electrical signal, in the present embodiment, detect probe adopts the hollow enamel wire coil of 50 circle of diameter 45mm, wire diameter 0.12mm.
Shield better result for reaching, detect probe 10 and filtering and amplifying circuit 20 and integrated signal occur and processing circuit 30 between by shielding conjunction cable, be connected, the shielding conjunction cable adopts 2 core iron silk screen shielded cables, the cable insulation layer material is polyethylene, 0.12 millimeter of core line diameter, two millimeters of screen layer diameters, the unit length wave impedance is about 70.887 ohm, long 1 meter of cable.
Filtering and amplifying circuit 20 is connected between detect probe 10 and integrated signal generation and processing circuit 30, for the electrical signal that detect probe 10 inductor coils are induced, carries out the amplification filtering processing.As shown in Figure 3, in the present embodiment, filtering and amplifying circuit adopts amplifier AD620 to form filtering and amplifying circuit.The magnification factor of this circuit can change by regulating slide rheostat Res1, and when Res1 is 25 kiloohm, magnification factor is 3 times.
As shown in Figure 4, integrated signal occurs and the input end of processing circuit 30 is connected with filtering and amplifying circuit 20, for receiving the signal after amplification filtering and carrying out the signal processing; Integrated signal occurs and an output terminals A of processing circuit 30 is connected with the drive coil of monitoring probe 10, and the output sinusoidal excitation signal, for producing external electromagnetic field by drive coil; Another output terminal B connection data memory circuit 40, stored for the signal by after processing.Integrated signal occurs and the signal processing method of processing circuit 30 is: the electrical signal of the near sinusoidal of the sine wave exciting signal of output terminals A and input end reception is made to scale operation, because the sine wave exciting signal of output terminals A is constant sinusoidal signal, the fluctuation situation of the DC signal value obtained has reflected the variation of testing signal.In the present embodiment, integrated signal occurs and processing circuit 30 is comprised of MAX1452 integrated signal process chip and resistance and capacity cell, the output terminals A of MAX1452 produces the frequency of sinusoidal signal and is determined by the value of capacitor C 21, the amplitude of output drive is determined by the value of resistance R 1, select the C21=7n farad, R1=10k ohm, the frequency that obtains sinusoidal excitation signal is 5kHz, amplitude is 5 volts.This signal flows to drive coil and produces external electromagnetic field, warp and tested pipeline effect, and Test coil receives electromagnetic induction signal, then passes through operation amplifier, inputs to the input end of integrated signal generation and processing circuit 30.
The input end of data storage circuitry 40 occurs with integrated signal and the output terminal of processing circuit 30 is connected, and for the testing signal to after processing, is stored.At first data storage circuitry becomes digital signal by analog-to-digital conversion module by analog signal conversion, then by writing data into memory.In an embodiment, use STM32 microcontroller and NandFlash storage to set up data storage circuitry.
In an embodiment, the battery that supplying cell group 50 adopts is the chargeable lithium cell group.Filtering and amplifying circuit 20, integrated signal generation and processing circuit 30, data storage circuitry 40 are arranged in same shielding box 60.Supplying cell group 50 is that filtering and amplifying circuit 20, the integrated signal in shielding box 60 occurs and processing circuit 30 and data storage circuitry 40 power supplies.
Working principle of the present invention is: the oil and gas pipes of the conductor materials such as employing iron and steel, under the effect of the ac-excited electromagnetic field sent at drive coil, can produce eddy current effect in tube wall, the electromagnetic induction signal that makes Test coil receive at inner surface of pipeline corrosion default position is different from other position, record and compare the electromagnetic induction signal that pipeline different parts Test coil receives, can realize the differentiation of pipeline inner and outer surface defect.
Utilize electromagnetic induction principle and eddy current effect thereof that the present invention is designed are carried out the sensor of detection zone subtube inner and outer surface corrosion default, its apparatus structure and mounting arrangements are simple, volume is little, be convenient to be arranged on the interior detection facility of various pipes defect, fast response time, testing precision is high, be applicable under the motion conditions of 0m/s～10m/s, pipeline inner and outer surface corrosion default is detected to differentiation, can detecting inner surface of pipeline, to be greater than 5mm * 5mm * 1mm(long * wide * dark) corrosion default, and the defect that can be greater than 2mm with pipeline outer wall defect residual wall thickness is effectively distinguished.
Claims (3)
1. a sensor of distinguishing pipeline inner and outer surface corrosion default, comprise detect probe (10), it is characterized in that: detect probe (10) comprises drive coil and Test coil, drive coil is for sending ac-excited electromagnetic field, the electromagnetic signal that Test coil induces for detection of tested tube wall, the input end of filtering and amplifying circuit (20) is connected by shielded cable with the Test coil of detect probe (10), for the electrical signal to detect probe output, amplified and filtering, integrated signal occurs and the signal generation output terminal of processing circuit (30) is connected with the drive coil of detect probe (10), send the simple alternating current excitation pulse for the drive coil to detect probe (10), integrated signal occurs and the signal processing input end of processing circuit (30) is connected with the output terminal of filtering and amplifying circuit (20), for reception & disposal, amplify and filtered electrical signal, data storage circuitry (40) occurs with integrated signal and the signal processing output terminal of processing circuit (30) is connected, the detection data that complete in order to stores processor, by supplying cell group (50), to sensor circuit, power, filtering and amplifying circuit (20), integrated signal generation and processing circuit (30) and supplying cell group (50) are arranged in same shielding box (60).
2. a kind of sensor of distinguishing pipeline inner and outer surface corrosion default according to claim 1, it is characterized in that: described integrated signal occurs and processing circuit (30) adopts MAX1452 integrated signal process chip, its signal processing method is, the sine wave exciting signal that will flow to detect probe (10) drive coil is made scale operation with the electrical signal that is received in filtering and amplifying circuit (20), obtain the DC signal of approximately constant, the fluctuation situation of this DC signal value has reflected the situation of change of probe and inner surface of pipeline distance, whether the corrosion default of inner surface of pipeline arranged.
3. a kind of sensor of distinguishing pipeline inner and outer surface corrosion default according to claim 1 is characterized in that: described data storage circuitry (40) is used the NandFlash storage to carry out the data storage.
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| CN201310460762.5A CN103499022B (en) | 2013-09-30 | 2013-09-30 | A kind of sensor distinguishing pipeline surfaces externally and internally corrosion default |
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| CN201310460762.5A CN103499022B (en) | 2013-09-30 | 2013-09-30 | A kind of sensor distinguishing pipeline surfaces externally and internally corrosion default |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106290558A (en) * | 2016-07-28 | 2017-01-04 | 南昌航空大学 | A kind of inner and outer walls of pipeline defect detecting device and detection method |
| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
| CN108181323A (en) * | 2017-12-15 | 2018-06-19 | 河南飞优驰网络科技有限公司 | Integrated circuit plate fault detection method and system based on electromagnetic signature |
| WO2019047397A1 (en) * | 2017-09-11 | 2019-03-14 | 清华大学 | Dynamic magnetic detection probe and electromagnetic array control method |
| CN110118308A (en) * | 2019-04-24 | 2019-08-13 | 中国石油天然气股份有限公司 | Pipe corrosion condition detection device and method |
| CN110291389A (en) * | 2017-02-10 | 2019-09-27 | 法玛通公司 | Pipe inspection unit and corresponding method with eddy current probe |
| CN111060588A (en) * | 2020-01-06 | 2020-04-24 | 南京航空航天大学 | Surface and buried depth defect classification method based on pulse eddy current technology |
| CN111336410A (en) * | 2020-04-20 | 2020-06-26 | 西南石油大学 | Real-time online detection device and method for erosion of magnetic conduction pipe column |
| US11300498B2 (en) | 2019-06-26 | 2022-04-12 | Micross Advanced Interconnect Technology Llc | Corrosion sensor and method and computerized system for using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106290558A (en) * | 2016-07-28 | 2017-01-04 | 南昌航空大学 | A kind of inner and outer walls of pipeline defect detecting device and detection method |
| CN106290558B (en) * | 2016-07-28 | 2019-06-07 | 南昌航空大学 | A kind of inner and outer walls of pipeline defect detecting device and detection method |
| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
| CN110291389A (en) * | 2017-02-10 | 2019-09-27 | 法玛通公司 | Pipe inspection unit and corresponding method with eddy current probe |
| WO2019047397A1 (en) * | 2017-09-11 | 2019-03-14 | 清华大学 | Dynamic magnetic detection probe and electromagnetic array control method |
| CN108181323A (en) * | 2017-12-15 | 2018-06-19 | 河南飞优驰网络科技有限公司 | Integrated circuit plate fault detection method and system based on electromagnetic signature |
| CN110118308A (en) * | 2019-04-24 | 2019-08-13 | 中国石油天然气股份有限公司 | Pipe corrosion condition detection device and method |
| CN110118308B (en) * | 2019-04-24 | 2021-03-09 | 中国石油天然气股份有限公司 | Pipeline corrosion condition detection device and method |
| US11300498B2 (en) | 2019-06-26 | 2022-04-12 | Micross Advanced Interconnect Technology Llc | Corrosion sensor and method and computerized system for using the same |
| CN111060588A (en) * | 2020-01-06 | 2020-04-24 | 南京航空航天大学 | Surface and buried depth defect classification method based on pulse eddy current technology |
| CN111336410A (en) * | 2020-04-20 | 2020-06-26 | 西南石油大学 | Real-time online detection device and method for erosion of magnetic conduction pipe column |
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| CN103499022B (en) | 2015-08-19 |
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