CN102537669A - Pipeline defect detection method and system based on ultrasonic guided wave focusing - Google Patents
Pipeline defect detection method and system based on ultrasonic guided wave focusing Download PDFInfo
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Abstract
The invention discloses a pipeline defect detection method and system based on ultrasonic guided wave focusing. The method comprises the following steps: sending a non-time-delay ultrasonic guided wave excitation signal; amplitude modulation and amplification of the signal; receiving a non-time-delay ultrasonic guided wave excitation signal; signal processing; forming a time-delay-free ultrasonic guided wave curve; calculating the transmission time of the ultrasonic guided wave from the object characteristics to each channel; calculating the time delay of each channel; sending an ultrasonic guided wave excitation signal with time delay according to the time delay information; amplitude modulation and amplification of the signal; forming a time-delay ultrasonic guided wave curve; obtaining the result; and repeating the above processes until exiting. The system consists of an ultrasonic guided wave sensor, a receiving module, an excitation module and a main processing unit, wherein the output of the main processing unit is connected with the input of the excitation module, the output of the excitation module is connected with the ultrasonic guided wave sensor, the output of the ultrasonic guided wave sensor is connected with the input of the receiving module, and the output of the receiving module is connected with the input of the main processing unit. The method is quick and convenient to operate, high in sensitivity, good in repeatability and reliability.
Description
Technical field
The present invention be a kind of based on supersonic guide-wave focus on to burying the method and system that the ground long distance pipeline carries out defects detection, relate to hyperacoustic measurement and pipe-line system technical field.
Background technique
It is the assurance of pipe safety operation that defect of pipeline detects, and is a kind of effective investment.Up to the present, built in China become and the long oil and gas pipeline that puts into effect above 60,000 kilometers.Along with the pipeline growth of service life, the corrosion that these long oil and gas pipelines receive from inside and outside two environment is also aggravating.Internal corrosion is mainly formed by synergy such as hydrops, dirt and pipeline internal stress in fed sheet of a media, the pipe; Outer corrosion is usually because of breakdown of coating, the generation of losing efficacy.These all will increase the unsafe factor of pipeline.Especially the old pipeline in northeast through the operation of decades, progresses into the accident section of taking place frequently in the later stage of " tub curve ".But; These can not also there is no need to discard at the old pipelines of using as a servant, and (some is that part is of serious failure; And other part does not have inefficacy or nonserious failure); As long as few relatively input is carried out regular defects detection, evaluation to pipeline, planned, maintenance and repair targetedly just can prolong these working life at the old pipeline of labour.It is much littler than " repairing " cost behind the pipeline accident initiatively to carry out planned " reparation ", can effectively avoid the generation of serious accident, improves social benefit and economic benefit.One of basic demand of repairing is exactly the accurate detection and the evaluation of buried pipeline corrosion situation, and its result plays key effect to the safe operation of pipeline.
Detect and the outer two-part that detect at present pipeline body detection means commonly used mainly being divided, interior detection is primarily aimed at long defeated main pipeline best results.But testing cost is high, needs the receiving ball tube device, and a complicated branch line or a station detection are carried out in inconvenience.And on the specific operation details, there is specific (special) requirements in the many factors of pipe interior.Detect outward and mainly contain conventional harmless outer detection and ultrasonic guided wave detecting etc.; The conventional harmless outer methods such as comprising conventional ultrasonic, magnetic and infiltration that detects; Can detect the wall thickness and the corrosion default of pipeline, and the inner defective of weld seam etc., be applicable to after the examination reinspection privileged site.Workload is big, needs excavation to divest anticorrosive coat and contact tube wall, is only limited to the excavation point is detected.Ultrasonic guided wave detecting can detect excavation point both sides certain distance, is applicable to complicated technology pipeline or field, station.
Often there is the pipeline section that detects in being not easy in a large number implement in the actual engineering; Excavation detects can not accomplish to cover fully whole tube section again; Therefore press for a kind of ducts health check-up survey technology of non-excavation, thereby alleviate the work difficulty of pipe detection, reduce the pipe detection expense.
Summary of the invention
The objective of the invention is to invent that a kind of excitation energy is bigger, precision and location be more accurately based on the defect of pipeline detecting method and the system of guided wave focusing scanning.
Method of the present invention is to utilize transducer excitation ultrasound signal and adjustment amplitude factor and time delays; Make ultrasound focus on any precalculated position in the pipeline; And adopt multichannel phased array array to detect apart from repeatedly focus at each; Change focus point in ducted distance,, just can obtain the defect distribution situation of whole pipe the peak swing record and the structure defective appearance and size information of each focal zone.
Utilize transducer that electric energy is converted into acoustic energy emission ultrasonic signal; Circuit design realizes amplitude modulation; And be that in algorithm transducer array adds sequential, and realizing that different time postpones (hereinafter to be referred as time delay), the acoustic signal that the transducer array through different delayed time and amplitude excites interacts and makes up; Realization can obtain maximum characteristic reflected signal on particular propagation direction and distance, promptly focus on.Constantly change amplitude and time-delay through algorithm and circuit again, thereby change focal position, repeatedly focus on, find defective at diverse location.
And idiographic flow of the present invention is as shown in Figure 1:
Send no time delay supersonic guide-wave excitation pulse;
Signal amplitude modulation is amplified;
Receive no time delay supersonic guide-wave excitation pulse;
Signal processing (amplification filtering);
Form no time delay supersonic guide-wave curve;
The calculating object characteristic is to the supersonic guide-wave transmission time of each passage;
Calculate each channel time delay;
Send the supersonic guide-wave excitation pulse that has time delay according to time delay information;
Signal amplitude modulation is amplified;
Be formed with time delay supersonic guide-wave curve;
Gained is guided wave focusing scanning result;
Repeat above process until withdrawing from.
Working principle of the present invention is following:
In the structure on border is arranged (as: flat board and cylinder), supersonic guide-wave has shown powerful structure and has followed trend and can propagate very long distance, and this is exactly guided wave along structural interface or near the ripple of interface Propagation of Energy.Because its low decay, guided wave is fit to remote non-destructive inspection.Guided wave is much more complicated than bulk wave usually, and also this just complexity is to providing more choices property of guided wave, and guided wave technology provides faster more economical mode for our detection.
Adopt phased array that the guided wave energy is gathered different circumference angles respectively; And carry out at the diverse location of pipeline; Through realizing the focusing scanning form of supersonic guide-wave, abnormal signal is decomposed on the normal mode of pipeline the image of build exception after the information processing; Obtained whole focusing scannings of pipeline like this, this technology is had the ability, and same sectional position detects a plurality of unusual on the pipeline section of certain distance.
According to the symmetry properties of guided wave, it is to be divided into two types that guided wave is propagated in pipeline: axisymmetry mode and mode of flexural vibration.The axisymmetry mode guided wave is well-regulated displacement and stress in the circumference of whole pipe.They can be divided into vertical pattern (with it corresponding be the symmetric pattern in the flat board) and torsional mode (this with flat board in the horizontal shear mode class seemingly).The axisymmetric guided wave can produce in the axisymmetric source.Different with the axisymmetry mode guided wave, distortion mode guided wave has the distribution of sinusoidal displacement and stress in circumference, and distortion mode will excite in the part of pipeline
Axisymmetric guided wave pipe detection is generally used for those fast long distance detection.Axisymmetric guided wave pipeline detection technique detects unusual with the sensor parallel to an axis.In recent years, the guided wave focusing technology is used for the pipe detection (Li and Rose, 2002) of long distance by growing up.This technical concerns is utilized distortion mode in control.Its employing phased array is formed multichannel, and (normally 4 to 8), through sending ultrasonic signal and adjustment amplitude factor and time delays, ultrasound can focus on any one definite in advance good position in the pipeline.Compare and axisymmetric guided wave pipe detection, this focusing technology can provide the penetrating capacity of about twice, and therefore distance will be a twice also, and in addition, because ripple all focuses on axially and circumference, coherent noise has also been lowered, thereby circumferential resolution has just been strengthened.
Amplitude factor all is relevant with time delays and line size, material, frequency, sensor and focal length.Therefore, these parameters all should at first join (Li and Rose, 2002) in the focusing algorithm when using.Should be through concrete case, algorithm computation time delays and amplitude factor.Being input to commercial phased array system to focusing parameter then is installed in tube circumference transmission signal and focuses on the appointed place.
A circuit scanning, the time delays of a plurality of focal positions and amplitude factor can calculate.Scanning at different focal positions just can obtain the whole scanning of pipeline.In the part that receives, the time is set to each waveform of receiving, and peak swing has write down the length of Focus area along axis.Being scanned into image pattern at final pipeline can come out these peak swing value marks, with the zone symmetry that focuses on.Angle focusing on can also mark these peak swing values.Circumference profile figure has presented the unusual circle distribution of Focus area, and when Focus area has when unusual, these important reflections can be seen.For unusual (as discontinuous) that non-axisymmetric characteristic is arranged, its circumferential profile diagram also is nonaxisymmetrical.If be axisymmetric (like weld seam) unusually, its circumferential profile diagram also is axisymmetric, notifies this mode, discontinuously can well make a distinction with weld seam unusually.
System of the present invention forms as shown in Figure 2; It is made up of supersonic guide-wave sensor, reception (preposition amplification) module, excitation (power amplification) module, Main Processor Unit; Main Processor Unit output connects the input of excitation (power amplification) module; The output of excitation (power amplification) module connects the supersonic guide-wave sensor; The output of supersonic guide-wave sensor receives the input of (preposition amplification) module, and the output that receives (preposition amplification) module connects the input of Main Processor Unit, and the output of Main Processor Unit has information input, storage, waveform demonstration, feature extraction, defect recognition.
Have the Main Processor Unit of information input to output control signals to excitation (power amplification) module, stimulating module is exported the electrical signal of big excitation energy, is converted into acoustic energy emission ultrasonic signal by the supersonic guide-wave sensor and acts on pipeline; The signal that is received by the supersonic guide-wave sensor send Main Processor Unit to handle after reception (preposition amplification) module is with power amplification and filtering, and Main Processor Unit is exported process result, and output has storage, waveform demonstration, feature extraction, defect recognition.
The electric principle of the defect of pipeline detection system that this focuses on based on supersonic guide-wave such as Fig. 3-shown in Figure 6.
Said Main Processor Unit is a microprocessor;
Said excitation (power amplification) module comprises amplification circuit and energizing circuit, after the amplification circuit output that meets the data output end DataBus of Main Processor Unit connects energizing circuit, connects the supersonic guide-wave sensor side by energizing circuit output;
Wherein energizing circuit is as shown in Figure 3, and it is made up of DAC8820 U7 and operational amplifier U8A, operational amplifier U8B, operational amplifier U9A, operational amplifier U9B; The R1 of U7, Rofs end connect+the 5V power supply through resistance R 9, and R1, Rofs hold through reference diode D7 and capacitor C 53 parallelly connected ground connection; "-" input end 6 of the Rcom termination operational amplifier U8B of U7, "+" input end 5 ground connection, the output terminal 7 of operational amplifier U8B connects the REF end of U7; "-" input end 2 of the Rof termination operational amplifier U8A of U7; "+" input end 3 ground connection; The output terminal one tunnel of operational amplifier U8A meets the Iout of U7 and between the Iout of U7 and Rof end, connects capacitor C 52, and " T " shape circuit that another road is formed through resistance R 10, resistance R 11 and capacitor C 56 connects "-" input end 2 of operational amplifier U9A, "+" input end 3 ground connection; The output terminal 1 one tunnel of operational amplifier U9A takes back "-" input end 2 after parallel resistor R12 and capacitor C 59; Another road connects "-" input end 6 of operational amplifier U9B, "+" input end 5 ground connection, and the output terminal 7 of operational amplifier U9B connects the HV input end of supersonic guide-wave sensor; Two outputs of operational amplifier U9B and operational amplifier U9A all are connected in parallel to the input of amplifier;
Wherein amplification circuit is as shown in Figure 6; It is made up of U607, the U608 of operational amplifier U606A, operational amplifier U606B and two ADC604YRUZ; Connect "+" input end 3 of operational amplifier U606A through capacitor C 620 by the end of the U605 D in the eliminator; "-" input end 2 of operational amplifier U606A connects the D end of U607, the output terminal 1 of the S1 termination operational amplifier U606A of U607, and be connected to capacitor C 624 between the output terminal 1 of operational amplifier U606A and "-" input end 2; The output terminal 1 of operational amplifier U606A connects "+" input end 5 of operational amplifier U606B through capacitor C 625; "-" input end 6 of operational amplifier U606B connects the D end of U608; The output terminal 7 of the S1 termination operational amplifier U606B of U608, and be connected to capacitor C 626 between the output terminal 7 of operational amplifier U606B and "-" input end 2;
Said reception (preposition amplification) module comprises receiving circuit, amplification circuit and eliminator, and the output that connects the receiving circuit of supersonic guide-wave sensor output is connected in series amplification circuit and eliminator successively, and eliminator output connects Main Processor Unit;
Wherein receiving circuit is as shown in Figure 4, and input JLANCE connects 4 ends of KR9,2 terminations of KR9+12V, and 3 ends also connect+12V once diode D101, and two connect 3 ends of Q17, the 2 end ground connection of Q17,1 termination 273U3/Q1 through resistance R 101; Another JLANCE connects 4 ends of KR1,2 terminations of KR1+12V, 3 ends also connect+12V once diode D102, two connect 3 ends of Q9 through resistance R 102, and 3 ends of Q9 through resistance R 103 and LED 9 to+12V, the 2 end ground connection of Q9,1 termination 273U2/Q1; 1 end of KR9 is connected with 1 end of KR1 after resistance R 104 connects 2 ends of U101; And 2 ends of U101 also have the first via to meet diode D103 and the series connection of D104 forward and differential concatenation to ground; Also have the second the tunnel connect behind forward and reverse diode connected in parallel D105 one the tunnel meet U101 3 ends; Two connect parallel resistor R105 and capacitor C 102 again to ground, and Third Road connects 6 ends that parallel resistor R106 and capacitor C 103 arrive U101; 4 terminations of U101-5V, 7 terminations+5V, 5 ends and the output of 14 ends;
Connect amplification circuit as shown in Figure 6 after the receiving circuit again, it with power amplifier module in used amplification circuit identical;
Wherein eliminator is as shown in Figure 5, and it is made up of U505, the U605 of U503, U504, U604 and two ADC604YRUZ of the U502 of two ADC608YRUZ, U602, three LTC1562; 2734U4/Q1,2734U4/Q2,2734U4/Q3 connect A0, A1, the A2 end of U502 respectively; The S1 of U502, S2 end respectively connects 1 end that meets U503 behind capacitor C 506, the electric capacity 507 jointly; S3, S4 end respectively connects 10 ends that meet U503 after capacitor C 508, the capacitor C 509 jointly; S5, S6 end respectively connects 20 ends that meet U504 after capacitor C 510, the capacitor C 511 jointly, and S7, S8 end respectively connect 1 end that meets U504 after capacitor C 512, the capacitor C 513 jointly; The S1 of U602, S2 end respectively connects 1 end that meets U604 after capacitor C 606, the capacitor C 607 jointly; S3, S4 end respectively connects 10 ends that meet U604 after capacitor C 608, the capacitor C 609 jointly; S5, S6 end respectively connects 11 ends that meet U504 after capacitor C 610, the capacitor C 611 jointly, and S7, S8 end respectively connect 10 ends that meet U504 after capacitor C 612, the capacitor C 613 jointly; 19 ends of 19 ends of U503,12 ends and U504,2 ends connect S1, S2, S3, the S4 end of U505 respectively; 12 ends of 19 ends of U604,12 ends and U504,9 ends connect S1, S2, S3, the S4 end of U605 respectively; The A0 of U505, A1 end output 2734U4/Q2,2734U4/Q3, the A0 of U605, A1 end output 2734U4/Q2,2734U4/Q3.
The invention has the advantages that and to carry out the defect estimation of non-excavation to bury the ground long distance pipeline in labour, thereby give security for pipe safety moves.The present invention need not clear up that the influence of pretreatment, Lift-off effect is little, equipment is light to seized pipe surface, operation rapid and convenient, highly sensitive, repeatability and good reliability.
Description of drawings
The defect of pipeline testing process figure that Fig. 1 focuses on based on supersonic guide-wave
Fig. 2 supersonic guide-wave focuses on defect of pipeline detection system theory diagram
Fig. 3 energizing circuit electrical schematic diagram
Fig. 4 receiving circuit electrical schematic diagram
Fig. 5 eliminator electrical schematic diagram
Fig. 6 amplification circuit electrical schematic diagram
Embodiment
Embodiment. this routine system forms as shown in Figure 2; It is made up of supersonic guide-wave sensor, reception (preposition amplification) module, excitation (power amplification) module, Main Processor Unit; Main Processor Unit output connects the input of excitation (power amplification) module; The output of excitation (power amplification) module connects the supersonic guide-wave sensor; The output of supersonic guide-wave sensor receives the input of (preposition amplification) module, and the output that receives (preposition amplification) module connects the input of Main Processor Unit, and the output of Main Processor Unit has information input, storage, waveform demonstration, feature extraction, defect recognition.
This routine system electricity principle such as Fig. 3-shown in Figure 6.
Said Main Processor Unit is a microprocessor;
Said excitation (power amplification) module comprises amplification circuit and energizing circuit, after the amplification circuit output that meets the data output end DataBus of Main Processor Unit connects energizing circuit, connects the supersonic guide-wave sensor side by energizing circuit output;
Wherein energizing circuit is as shown in Figure 3, and it is made up of DAC8820 U7 and operational amplifier U8A, operational amplifier U8B, operational amplifier U9A, operational amplifier U9B; The R1 of U7, Rofs end connect+the 5V power supply through resistance R 9, and R1, Rofs hold through reference diode D7 and capacitor C 53 parallelly connected ground connection; "-" input end 6 of the Rcom termination operational amplifier U8B of U7, "+" input end 5 ground connection, the output terminal 7 of operational amplifier U8B connects the REF end of U7; "-" input end 2 of the Rof termination operational amplifier U8A of U7; "+" input end 3 ground connection; The output terminal one tunnel of operational amplifier U8A meets the Iout of U7 and between the Iout of U7 and Rof end, connects capacitor C 52, and " T " shape circuit that another road is formed through resistance R 10, resistance R 11 and capacitor C 56 connects "-" input end 2 of operational amplifier U9A, "+" input end 3 ground connection; The output terminal 1 one tunnel of operational amplifier U9A takes back "-" input end 2 after parallel resistor R12 and capacitor C 59; Another road connects "-" input end 6 of operational amplifier U9B, "+" input end 5 ground connection, and the output terminal 7 of operational amplifier U9B connects the HV input end of supersonic guide-wave sensor; Two outputs of operational amplifier U9B and operational amplifier U9A all are connected in parallel to the input of amplifier;
Wherein amplification circuit is as shown in Figure 6; It is made up of U607, the U608 of operational amplifier U606A, operational amplifier U606B and two ADC604YRUZ; Connect "+" input end 3 of operational amplifier U606A through capacitor C 620 by the end of the U605 D in the eliminator; "-" input end 2 of operational amplifier U606A connects the D end of U607, the output terminal 1 of the S1 termination operational amplifier U606A of U607, and be connected to capacitor C 624 between the output terminal 1 of operational amplifier U606A and "-" input end 2; The output terminal 1 of operational amplifier U606A connects "+" input end 5 of operational amplifier U606B through capacitor C 625; "-" input end 6 of operational amplifier U606B connects the D end of U608; The output terminal 7 of the S1 termination operational amplifier U606B of U608, and be connected to capacitor C 626 between the output terminal 7 of operational amplifier U606B and "-" input end 2;
Said reception (preposition amplification) module comprises receiving circuit, amplification circuit and eliminator, and the output that connects the receiving circuit of supersonic guide-wave sensor output is connected in series amplification circuit and eliminator successively, and eliminator output connects Main Processor Unit;
Wherein receiving circuit is as shown in Figure 4, and input JLANCE connects 4 ends of KR9,2 terminations of KR9+12V, and 3 ends also connect+12V once diode D101, and two connect 3 ends of Q17, the 2 end ground connection of Q17,1 termination 273U3/Q1 through resistance R 101; Another JLANCE connects 4 ends of KR1,2 terminations of KR1+12V, 3 ends also connect+12V once diode D102, two connect 3 ends of Q9 through resistance R 102, and 3 ends of Q9 through resistance R 103 and LED 9 to+12V, the 2 end ground connection of Q9,1 termination 273U2/Q1; 1 end of KR9 is connected with 1 end of KR1 after resistance R 104 connects 2 ends of U101; And 2 ends of U101 also have the first via to meet diode D103 and the series connection of D104 forward and differential concatenation to ground; Also have the second the tunnel connect behind forward and reverse diode connected in parallel D105 one the tunnel meet U101 3 ends; Two connect parallel resistor R105 and capacitor C 102 again to ground, and Third Road connects 6 ends that parallel resistor R106 and capacitor C 103 arrive U101; 4 terminations of U101-5V, 7 terminations+5V, 5 ends and the output of 14 ends;
Connect amplification circuit as shown in Figure 6 after the receiving circuit again, it with power amplifier module in used amplification circuit identical;
Wherein eliminator is as shown in Figure 5, and it is made up of U505, the U605 of U503, U504, U604 and two ADC604YRUZ of the U502 of two ADC608YRUZ, U602, three LTC1562; 2734U4/Q1,2734U4/Q2,2734U4/Q3 connect A0, A1, the A2 end of U502 respectively; The S1 of U502, S2 end respectively connects 1 end that meets U503 behind capacitor C 506, the electric capacity 507 jointly; S3, S4 end respectively connects 10 ends that meet U503 after capacitor C 508, the capacitor C 509 jointly; S5, S6 end respectively connects 20 ends that meet U504 after capacitor C 510, the capacitor C 511 jointly, and S7, S8 end respectively connect 1 end that meets U504 after capacitor C 512, the capacitor C 513 jointly; The S1 of U602, S2 end respectively connects 1 end that meets U604 after capacitor C 606, the capacitor C 607 jointly; S3, S4 end respectively connects 10 ends that meet U604 after capacitor C 608, the capacitor C 609 jointly; S5, S6 end respectively connects 11 ends that meet U504 after capacitor C 610, the capacitor C 611 jointly, and S7, S8 end respectively connect 10 ends that meet U504 after capacitor C 612, the capacitor C 613 jointly; 19 ends of 19 ends of U503,12 ends and U504,2 ends connect S1, S2, S3, the S4 end of U505 respectively; 12 ends of 19 ends of U604,12 ends and U504,9 ends connect S1, S2, S3, the S4 end of U605 respectively; The A0 of U505, A1 end output 2734U4/Q2,2734U4/Q3, the A0 of U605, A1 end output 2734U4/Q2,2734U4/Q3.
Wherein selecting for use of each components and parts is marked among Fig. 3-Fig. 6.
Energizing circuit wherein:
U7 selects DAC8820;
U8A, U8B, U9A, U9B select OP262;
R8, R11 select 10K;
R9 selects 300K;
R10, R12, R13 select 20K;
C51, C52, C53, C54, C55, C57, C58 select 104;
C56, C59, C60 select 103;
Amplification circuit wherein:
U605, U607, U608 advance ADG604YRUZ;
U606A, U606B select OP262GS;
R625, R630 select 10K;
R626, R631 select 22K;
R627, R632 select 6.8K;
R628, R633 select 2.7K;
R629, R634 select 330K;
Receiving circuit wherein:
U101 selects LT1792LS8;
D101, D102, D103, D104, D105, D106, D107 select DAV99;
KR1 selects 36K;
Q9, Q17 select K72;
R101, R102 select 100K;
R103 selects 33K;
R104 selects 20K;
R105 selects 10K;
R106 selects 350K;
C101, C104, C128 select 104;
C102, C103 select 103;
Eliminator wherein:
U503, U504, U604 select LTC1562;
U502, U602 select ADG608BRUZ;
R513 selects 300K;
R514 selects 4M;
R515 selects 300K;
R516 selects 4M;
R517 selects 150K;
R518 selects 1M;
R519 selects 150K;
R520 selects 1M;
R521 selects 75K;
R522 selects 250K;
R523 selects 43K;
R524 selects 82K;
R613 selects 300K;
R614 selects 4M;
R615 selects 300K;
R616 selects 4M;
R617 selects 150K;
R618 selects 1M;
R619 selects 150K;
R620 selects 1M;
R621 selects 75K;
R622 selects 250K;
R623 selects 43K;
R624 selects 82K;
C504, C505, C506, C507, C508, C509, C510, C511, C512, C513, C514, C515, C516, C517, C518, C519, C520, C521, C604, C605, C606, C607, C608, C609, C610, C611, C612, C613, C614, C615, C616, C617, C618, C619, C620, C621 are 103 electric capacity of acquiescence; Other do not mark the 100K that resistance (R) is acquiescence.
The guided wave focusing scanning is tested on the 40s steel pipeline of 24m length at the 508mm diameter, and flow process is as shown in Figure 1.In experiment, phased array is divided for four passages.Four-way can cover 90 ° zone in theory, and four measurements enough cover whole circumference, but in order to ensure there being sufficient energy to cover whole circumference, has carried out focusing scanning at each focusing distance 8 times with the four-way array.Be placed on place to transducer array from pipe end 1#1.4m; Vertical L (m, 2) modal waves and distortion (m, 1) modal waves are transmitted in the two ends of pipeline; Carry out the test of some sample waveforms and obtained their corresponding annular echo sectional drawings; Conclusion is following, and the T that phased array obtains (m, 1) distorted wave focuses on the waveform when pipeline end 6.32m; Zone in each oscillogram between two vertical lines is exactly the focal zone, can very clearly see these focal zone, oscillogram the inside echoes maximum be 270 ° the time echo.Also can confirm axial position exactly the time of advent through maximum echo.
It is thus clear that this example need not be cleared up pretreatment to seized pipe surface, equipment is light, and the operation rapid and convenient is highly sensitive, repeatability and good reliability.
Claims (5)
1. defect of pipeline detecting method that focuses on based on supersonic guide-wave; It is characterized in that utilizing transducer excitation ultrasound signal and adjustment amplitude factor and time delays; Make ultrasound focus on any precalculated position in the pipeline, and adopt multichannel phased array array to detect apart from repeatedly focus on, change focus point in ducted distance at each; With the peak swing record and the structure defective appearance and size information of each focal zone, just obtain the defect distribution situation of whole pipe.
2. a kind of defect of pipeline detecting method that focuses on based on supersonic guide-wave according to claim 1 is characterized in that idiographic flow is:
Send no time delay supersonic guide-wave excitation pulse;
Signal amplitude modulation is amplified;
Receive no time delay supersonic guide-wave excitation pulse;
Signal processing;
Form no time delay supersonic guide-wave curve;
The calculating object characteristic is to the supersonic guide-wave transmission time of each passage;
Calculate each channel time delay;
Send the supersonic guide-wave excitation pulse that has time delay according to time delay information;
Signal amplitude modulation is amplified;
Be formed with time delay supersonic guide-wave curve;
Gained is guided wave focusing scanning result;
Repeat above process until withdrawing from.
3. defect of pipeline detection system that focuses on based on supersonic guide-wave of using the said method of claim 1; It is characterized in that it is made up of supersonic guide-wave sensor, receiving module, stimulating module, Main Processor Unit; Main Processor Unit output connects the input of stimulating module; Stimulating module output connects the supersonic guide-wave sensor; The output of supersonic guide-wave sensor connects the input of receiving module, and the output of receiving module connects the input of Main Processor Unit, and the output of Main Processor Unit has information input, storage, waveform demonstration, feature extraction, defect recognition;
Have the Main Processor Unit of information input to output control signals to stimulating module, stimulating module is exported the electrical signal of big excitation energy, is converted into acoustic energy emission ultrasonic signal by the supersonic guide-wave sensor and acts on pipeline; The signal that is received by the supersonic guide-wave sensor send Main Processor Unit to handle after receiving module is with power amplification and filtering, and Main Processor Unit is exported process result.
4. a kind of defect of pipeline detection system that focuses on based on supersonic guide-wave according to claim 3; It is characterized in that said stimulating module comprises amplification circuit and energizing circuit; After the amplification circuit output that meets the data output end DataBus of Main Processor Unit connects energizing circuit, connect the supersonic guide-wave sensor side by energizing circuit output;
Wherein energizing circuit is made up of DAC8820U7 and operational amplifier U8A, operational amplifier U8B, operational amplifier U9A, operational amplifier U9B; The R1 of U7, Rofs end connect+the 5V power supply through resistance R 9, and R1, Rofs hold through reference diode D7 and capacitor C 53 parallelly connected ground connection; "-" input end 6 of the Rcom termination operational amplifier U8B of U7, "+" input end 5 ground connection, the output terminal of operational amplifier U8B (7) connects the REF end of U7; "-" input end (2) of the Rof termination operational amplifier U8A of U7; "+" input end (3) ground connection; The output terminal one tunnel of operational amplifier U8A meets the Iout of U7 and between the Iout of U7 and Rof end, connects capacitor C 52; " T " shape circuit that another road is formed through resistance R 10, resistance R 11 and capacitor C 56 connects "-" input end (2) of operational amplifier U9A; "+" input end (3) ground connection, the output terminal (1) a tunnel of operational amplifier U9A takes back "-" input end (2) after parallel resistor R12 and capacitor C 59, and another road connects "-" input end (6) of operational amplifier U9B; "+" input end (5) ground connection, the output terminal of operational amplifier U9B (7) connects the HV input end of supersonic guide-wave sensor; Two outputs of operational amplifier U9B and operational amplifier U9A all are connected in parallel to the input of amplifier;
Wherein amplification circuit it form by U607, the U608 of operational amplifier U606A, operational amplifier U606B and two ADC604YRUZ; Connect "+" input end (3) of operational amplifier U606A through capacitor C 620 by the end of the U605D in the eliminator; "-" input end (2) of operational amplifier U606A connects the D end of U607; The output terminal (1) of the S1 termination operational amplifier U606A of U607, and be connected to capacitor C 624 between the output terminal of operational amplifier U606A (1) and "-" input end (2); The output terminal of operational amplifier U606A (1) connects "+" input end (5) of operational amplifier U606B through capacitor C 625; "-" input end (6) of operational amplifier U606B connects the D end of U608; The output terminal (7) of the S1 termination operational amplifier U606B of U608, and be connected to capacitor C 626 between the output terminal of operational amplifier U606B (7) and "-" input end (2).
5. a kind of defect of pipeline detection system that focuses on based on supersonic guide-wave according to claim 3; It is characterized in that said receiving module comprises receiving circuit, amplification circuit and eliminator; The output that connects the receiving circuit of supersonic guide-wave sensor output is connected in series amplification circuit and eliminator successively, and eliminator output connects Main Processor Unit;
Wherein receiving circuit is: input JLANCE connects (4) end of KR9, (2) termination+12V of KR9, and (3) are held once diode D101 and are also connect+12V, and two connect (3) end of Q17, Q17 (2) end ground connection, (1) termination 273U3/Q1 through resistance R 101; Another JLANCE connect KR1's (4) end, (2) termination+12V of KR1, (3) are held once diode D102 and are also connect+12V; Two through resistance R 102 connect Q9 (3) end; And Q9 (3) end through resistance R 103 and LED 9 to+12V, (2) end ground connection of Q9, (1) termination 273U2/Q1; KR9 (1) end be connected with (1) end of KR1 after resistance R 104 connect U101's (2) hold; And U101 (2) end also has the first via to meet diode D103 and the series connection of D104 forward and differential concatenation to ground; Also have the second the tunnel connect behind forward and reverse diode connected in parallel D105 one the tunnel meet U101 (3) end; Two connect parallel resistor R105 and capacitor C 102 again to ground, and Third Road meets parallel resistor R106 and holds with (6) of capacitor C 103 to U101; (4) termination-5V of U101, (7) termination+5V, (5) end and the output of (14) end;
The amplification circuit that wherein connects after the receiving circuit is: U607, U608 by operational amplifier U606A, operational amplifier U606B and two ADC604YRUZ form; Connect "+" input end (3) of operational amplifier U606A through capacitor C 620 by the end of the U605D in the eliminator; "-" input end (2) of operational amplifier U606A connects the D end of U607; The output terminal (1) of the S1 termination operational amplifier U606A of U607, and be connected to capacitor C 624 between the output terminal of operational amplifier U606A (1) and "-" input end (2); The output terminal of operational amplifier U606A (1) connects "+" input end (5) of operational amplifier U606B through capacitor C 625; "-" input end (6) of operational amplifier U606B connects the D end of U608; The output terminal (7) of the S1 termination operational amplifier U606B of U608, and be connected to capacitor C 626 between the output terminal of operational amplifier U606B (7) and "-" input end (2);
Wherein eliminator is made up of U505, the U605 of U503, U504, U604 and two ADC604YRUZ of the U502 of two ADC608YRUZ, U602, three LTC1562; 2734U4/Q1,2734U4/Q2,2734U4/Q3 connect A0, A1, the A2 end of U502 respectively; The S1 of U502, S2 end respectively connects (1) end that meets U503 behind capacitor C 506, the electric capacity 507 jointly; S3, S4 end respectively connects (10) end that meets U503 after capacitor C 508, the capacitor C 509 jointly; S5, S6 end respectively connects (20) end that meets U504 after capacitor C 510, the capacitor C 511 jointly, and S7, S8 end respectively connect (1) end that meets U504 after capacitor C 512, the capacitor C 513 jointly; The S1 of U602, S2 end respectively connects (1) end that meets U604 after capacitor C 606, the capacitor C 607 jointly; S3, S4 end respectively connects (10) end that meets U604 after capacitor C 608, the capacitor C 609 jointly; S5, S6 end respectively connects (11) end that meets U504 after capacitor C 610, the capacitor C 611 jointly, and S7, S8 end respectively connect (10) end that meets U504 after capacitor C 612, the capacitor C 613 jointly; (19) end of U503, (12) end and (19) end of U504, S1, S2, S3, the S4 end that (2) end meets U505 respectively; (19) end of U604, (12) end and (12) end of U504, S1, S2, S3, the S4 end that (9) end meets U605 respectively; The A0 of U505, A1 end output 2734U4/Q2,2734U4/Q3, the A0 of U605, A1 end output 2734U4/Q2,2734U4/Q3.
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| CN111322524A (en) * | 2020-03-02 | 2020-06-23 | 周红 | Safety detection method, device and detection equipment for drilling platform |
| CN115436267A (en) * | 2022-09-09 | 2022-12-06 | 大连理工大学 | Continuous pipeline corrosion quantitative detection method based on reflected L (0,1) guided wave |
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| CN117648594B (en) * | 2024-01-29 | 2024-04-05 | 长沙市海图科技有限公司 | Urban safety gas pipe network defect identification and management method |
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Effective date of registration: 20211110 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 China Petroleum Building, No. 9, Dongzhimen North Street, Dongcheng District, Beijing Patentee before: PetroChina Company Limited |
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