CN105241952B - A kind of channel bend defect inspection method and detection means based on far-field eddy - Google Patents
A kind of channel bend defect inspection method and detection means based on far-field eddy Download PDFInfo
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- CN105241952B CN105241952B CN201510719902.5A CN201510719902A CN105241952B CN 105241952 B CN105241952 B CN 105241952B CN 201510719902 A CN201510719902 A CN 201510719902A CN 105241952 B CN105241952 B CN 105241952B
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Abstract
A kind of channel bend defect inspection method and detection means based on far-field eddy.It mainly solves existing EDDY CURRENT and is used for the technical problem such as blind area or probe passability difference during channel bend being present.Its drip irrigation device is：Using the far-field eddy sensor formed including two identical exciting units and a receiving unit, and two exciting unit be located at receiving unit both sides respectively, exciting unit and receiving unit are circumferentially disposed along detected channel bend cross section, and receiving unit is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal；After far-field eddy sensor applies harmonic excitation, furthered far-field region using double excitation, improve measured signal amplitude；Sensor measures the phase difference for the signal relative excitation signal that receiving unit receives, so as to obtain the variation characteristic of phase difference, that is, obtains corrosion and the crack defect information at channel bend along channel bend circumferential scanning.It mainly uses far-field eddy principle, is detected applied to the defects of channel bend.
Description
Technical field
It is rotten at more particularly to a kind of channel bend based on far-field eddy the present invention relates to a kind of electromagnetic nondestructive method
Erosion or the detection method and special purpose device of crack defect.
Background technology
Pipeline is widely used in multiple industries such as oil gas, chemical industry, electric power and heating, and channel bend is in pipeline pipe-line system
Indispensable part.Most channel bends are influenceed by high temperature, high pressure and complex external environment at work, and are made
With being washed away all the time by medium on the inside of process middle pipe road elbow positive camber, so as to produce erosion corrosion, trommel.It is in addition, high
Under warm high pressure, channel bend tube wall easily cracks.Disadvantages described above easy Rapid Expansion under high pressure, is caused at channel bend
Tube wall ftractures, and then triggers leakage accident.The situation of channel bend directly affects the safe and smooth operation of whole pipe-line system, because
This is necessary to research and develop channel bend detection means.
At present, the detection method of channel bend has ultrasound examination, ray detection, conventional vortex detection, impulse eddy current inspection
Survey etc..Ultrasound examination needs couplant, and operating temperature should not be too high；Ray detection needs radioactive source, actually detected process
It is middle pollution to be present and harmful；Conventional vortex detection is easily influenceed by kelvin effect, and detection is intended to lacking for surface of test piece
Fall into；Pulsed eddy current testing belongs to putting type fixed point detection, when being detected for baroque channel bend, exists certain blind
Area, and it is inadequate to local flaw sensitivity.Existing precursor in far field device is detected using inside-through type mostly, and interior is passed through
Formula detection all has one disadvantage in that：It is difficult to the elbow by there may be deposit.
Sun Yushi, Qu Minxing, man of department village such as Nanjing College of Aeronautical Engineering invent and applied for a patent July 7 nineteen ninety " remote
Field Eddy Current Nondestructive Testing highly effective probe "（Number of patent application 90105697.9, publication number CN1058097）Disclose three kinds remote
Eddy current probe improved technology, including magnetic loop is set to excitation coil, magnetic loop is set to receiving coil, and in excitation and
Bucking coil is set between receiving coil, signal amplitude height is obtained by these improvement, exciting power is small, axial length of popping one's head in
The achievement such as small.These corrective measures reduce the application difficulty of far-field eddy, reduce probe certain length, but in channel bend
Place is still difficult to pass through.And for example the Chen Peihua of Zhejiang University, Huangping victory, Li Guohou, Zhou Zekui were invented and on October 27th, 2012
" a kind of metal defect eddy current detection device and its probe " applied for a patent（Application number 201210416556.X, publication number
CN102879462）Disclose a kind of metal defect eddy current detection device and its sonde configuration based on frequency mixing technique, the device knot
Two kinds of technologies of conventional vortex and low frequency far-field eddy of conjunction, can be detected to tabular or tubular metal material defect, but above-mentioned pipe
Shape is only capable of as straight tube and can only placed on pipeline axle with reference to its sonde configuration, normal equivalent to being applied only for when detection is placed on week
EDDY CURRENT is advised, therefore is difficult in this specific position of channel bend, tested part curved surface complexity, this device to this smooth inspection
Survey.And for example United States Patent (USP) " the far-field eddy sensor of flexible unit connection "（Number of patent application US19970941057, publication number
US6087830）, it can be by the channel bend of inner clean, but easily produces accumulation at the channel bend applied to industry
Thing, so as to which far-field eddy sensor passes through certain difficulty, increase detection difficulty.
In summary, detection of the existing detection method for channel bend this specific position suffers from certain limitation
Property.
The content of the invention
It is an object of the invention to overcome various weak points existing for prior art, and one kind is provided and drawn using double excitation
Nearly far-field region, the advantage for improving measured signal amplitude, fully demonstrating precursor in far field, solves inside-through type far-field eddy sensing
Device is difficult to the channel bend defect inspection method and detection means based on far-field eddy of the problem detected to channel bend.
The technical solution adopted for the present invention to solve the technical problems is：Using including two identical exciting units and one
The far-field eddy sensor that receiving unit is formed, and two exciting units are located at receiving unit both sides, exciting unit and reception respectively
Unit is circumferentially disposed along detected channel bend cross section, and receiving unit is positioned at the far field of measurement INDIRECT COUPLING magnetic field signal
Region；After far-field eddy sensor applies harmonic excitation, furthered far-field region using double excitation, improve measured signal amplitude；Pass
Sensor measures the phase difference for the signal relative excitation signal that receiving unit receives, so as to obtain along channel bend circumferential scanning
The variation characteristic of phase difference, that is, obtain corrosion and crack defect information at channel bend.
The far-field eddy sensor successively with harmonic signal exciting circuit, signal processing circuit, A/D change-over circuits and meter
Calculation machine is connected, and harmonic signal exciting circuit provides harmonic excitation to far-field eddy sensor, and far-field eddy sensor is arranged on
Channel bend outer surface, the INDIRECT COUPLING magnetic field signal for producing and being vortexed and receive vortex far-field region is induced with excitation, converted
After voltage signal, signal processing circuit is sent to, signal processing circuit is amplified to the signal of reception, filtered, after comparison,
Send A/D change-over circuits to, A/D change-over circuits convert analog signals into data signal and sent in computer, and computer is to data
Handled, so as to obtaining the corrosion of tested pipeline elbow and crack defect information.
Further, the far-field eddy sensor is arranged on the cross section of channel bend 1；The exciting unit includes excitation
Coil 3, the receiving unit include receiving coil 4, and the axis of excitation coil 3 is circumferentially disposed along channel bend 1, the axle of receiving coil 4
Line is radially arranged along channel bend；Receiving coil 4 is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal；To sensor excitation
Applying a harmonic excitation in coil 3, the exciting field of change triggers along the circumferentially distributed alternating magnetic field in the cross section of channel bend 1,
Receiving coil 4 in receiving unit is located at far-field region measurement INDIRECT COUPLING magnetic field signal, and measured signal is relative to pumping signal
The change of phase difference show corrosion or the presence of crack defect, by observing and analyzing the variation characteristic of phase difference so as to reality
Now to the detection of the defect situation of channel bend 1.
Detection method comprises the following steps：Step 1：In the circumferentially disposed far-field eddy sensor of channel bend, to carry out
Scanning；Step 2：Apply low-frequency harmonics excitation to the exciting unit of far-field eddy sensor；Step 3：It is circumferential along channel bend
Scanning, measure the phase difference of the signal relative excitation signal received in the receiving coil in receiving unit；Step 4：Pass through sight
Survey and analyze the variation characteristic of phase difference, you can differentiate the corrosion at channel bend and crack defect situation.
The channel bend detection means of the present invention, it is remote by being formed including two identical exciting units and a receiving unit
Field eddy current sensor 2, and two exciting units are located at receiving unit both sides respectively.The exciting unit includes excitation coil 3, described
Receiving unit includes receiving coil 4, and the axis of excitation coil 3 is circumferentially disposed along channel bend 1, and the axis of receiving coil 4 is curved along pipeline
Head is radially arranged, and receiving coil 4 is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal.
The far-field eddy sensor 2 includes housing 13, end cap 11, excitation coil 3, receiving coil 4 and socket；Housing 13
To be provided with " ︹ " type structure of inner chamber, and both ends set opening, and end cap 11 coordinates in the opening at the both ends of housing 13；Swash
Encourage coil 3 to be packed on the inwall of the inner chamber both sides of housing 13, receiving coil 4 is packed in the inner chamber Zhong Yao bottoms of housing 13, excitation line
The lead of circle 3 and receiving coil 4 is connected with socket respectively.Two excitation coils 3 can be symmetricly set on the both sides of receiving coil 4.
The far-field eddy sensor 2 successively with low-frequency harmonics exciting circuit 5, signal processing circuit 6, A/D change-over circuits 7
It is connected with computer 8.
The exciting unit includes excitation coil 3 and screen unit 12, and excitation coil 3 is arranged in screen unit 12；Institute
State excitation coil 3 and use square coil；Receiving coil 4 uses cylindrical coil.
The present invention furthers far-field region by using double excitation, improves measured signal amplitude, fully demonstrates precursor in far field
Advantage, solve inside-through type far-field eddy sensor and be difficult to the problem that is detected to channel bend.It also has following several
The advantages of individual aspect：（1）Pipe thickness is approximate with detection signal phase directly proportional, is easy to defect resolution；（2）Not by kelvin effect
Influence, and influenceed less by Lift-off effect；（3）There is same sensitivity to defect inside and outside tube wall；（4）It is non-to inherit conventional vortex
Contact and it is quick the advantages of, while take scan mode to greatly reduce check frequency.
Brief description of the drawings
Fig. 1 is the channel bend detection means cross section structure diagram of the present invention
Fig. 2 is the channel bend detection means using state structure diagram of the present invention；
Fig. 3 is the Cleaning Principle schematic diagram of the present invention；
Fig. 4 is the sample sketch that the present invention is detected；
Fig. 5 is Fig. 4 A-A cross section structure diagrams；
Fig. 6 is the amplitude signal drawn using the far-field eddy sensor detection of an excitation coil and a receiving coil
Curve map；
Fig. 7 is that the phase difference drawn using the far-field eddy sensor detection of an excitation coil and a receiving coil is bent
Line chart；
Fig. 8 is the Poynting's vector drawn using the far-field eddy sensor detection of an excitation coil and a receiving coil
Spirogram；
Fig. 9 is the amplitude signal curve map drawn using the far-field eddy sensor detection of double excitation coil；
Figure 10 is the phase dygoram drawn using the far-field eddy sensor detection of double excitation coil；
Figure 11 is the Poynting's vector spirogram drawn using the far-field eddy sensor detection of double excitation coil；
When Figure 12 is apparatus of the present invention measurement, detection coil axis is measured when being defect center line to be corresponding in turn to different lack
Phase diagram when falling into.
In figure：Channel bend -1, far-field eddy sensor -2, excitation coil -3, receiving coil -4, harmonic signal excitation electricity
Road -5, signal processing circuit -6, A/D change-over circuits -7, computer -8, aviation socket -9, handle -10, end cap -11, shielding are single
Member -12, housing -13.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and examples.
Existing in general far-field eddy sensor is swashed only with an excitation coil and a receiving coil when using one
When encouraging the pipeline that Coil Detector external diameter is 80mm, the amplitude signal curve, phase difference curve and the Poynting's vector spirogram difference that draw
As shown in Fig. 6,7,8, there is flex point in amplitude, and phase has 90 ° of changes, and energy also penetrates tube wall, illustrates that there occurs far field twice
Vortex phenomenon.But far-field region is located at amplitude and phase be basically unchanged with energy secondary penetration region, swashed as seen from the figure using one
When encouraging coil, the arc length distance in far-field region to excitation coil axis is 100mm to 120mm.It gathers far-field eddy phenomenon
" amplitude signal curve, phase difference curve and Poynting vector " three key character signals relative to pumping signal change very
It is small, and easily disturbed by noise signal, it is difficult to for judge object being measured with the presence or absence of such defects such as corrosion or crackles.Cause
Amplitude signal is very faint, so as to require higher to signal processing circuit below, in addition, the relative excitation coil in far-field region away from
From to increase size sensor more greatly, so as to which cost is also bigger.
The far-field eddy sensor that the present invention is formed using two identical exciting units and a receiving unit is included, and two
Exciting unit is located at receiving unit both sides respectively, and exciting unit and receiving unit are circumferentially set along detected channel bend cross section
Put, and receiving unit is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal；When far-field eddy sensor applies harmonic excitation
Afterwards, furthered far-field region using double excitation, improve measured signal amplitude；It is single to measure reception along channel bend circumferential scanning for sensor
The phase difference for the signal relative excitation signal that member receives, so as to obtain the variation characteristic of phase difference, that is, obtain at channel bend
Corrosion and crack defect information.
It follows that the detection method of the present invention belongs to precursor in far field, it is the lossless inspection based on far-field eddy effect
Survey technology, therefore can be with Far Field Swirl Detecting Technology come detected rule Curved surface metal material, depending on ruled surface metal material
In whether there occurs far-field eddy phenomenon.Far-field eddy phenomenon has three key characters：Amplitude flex point, 90 ° of phase place changes and energy
Amount penetrates test specimen, " amplitude signal curve, phase difference curve and the slope print that the present invention passes through this collection far-field eddy phenomenon twice
Three key character signals of court of a feudal ruler vector " judge object being measured with the presence or absence of corrosion or split relative to the change of pumping signal
Such defect such as line.
The present invention is by using double excitation method, so as to the amplitude signal curve, phase difference curve and Poynting's vector that draw
Spirogram is respectively as shown in Fig. 9,10,11, similarly, it is known that there occurs far-field eddy phenomenon, during with respect to an excitation coil, and far-field region
Amplitude signal increases, and far-field region is located at 35mm to 45mm places, and far-field region is furthered.During far-field eddy sensor optimization, often examine
Consider signal amplitude and far-field region distance.
Embodiment 1, refering to Fig. 1-3, screen unit 12 is made using silicon steel sheet.Handle 10 passes through hexagonal with end cap 11
Mode connects for screw, end cap 11 are connected with housing 13 by Cross Recess Head Screw.Excitation coil 3 is fixed on housing bottom both ends, connects
Take-up circle 4 is fixed on housing cavity bottom center, and screen unit 12 covers on the top of excitation coil 3, excitation coil 3 and receiving coil
4 leads are connected with aviation socket 9.Far-field eddy sensor is arranged on the cross section of channel bend 1；The exciting unit includes
Excitation coil 3, the receiving unit include receiving coil 4, and the axis of excitation coil 3 is circumferentially disposed along channel bend 1, receiving coil
4 axis are radially arranged along channel bend；Receiving coil 4 is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal；To sensor
Apply a harmonic excitation in excitation coil 3, the exciting field of change triggers along the circumferentially distributed alternation magnetic in the cross section of channel bend 1
, the receiving coil 4 in receiving unit is located at far-field region measurement INDIRECT COUPLING magnetic field signal, and circumferential movable sensor is to pipeline
Elbow is scanned, and measured signal shows corrosion or the presence of crack defect relative to the change of the phase difference of pumping signal,
Pass through the detection for observing and analyzing the variation characteristic of phase difference so as to realize to the defect situation of channel bend 1.
Detection method comprises the following steps：Step 1：In the circumferentially disposed far-field eddy sensor of channel bend, to carry out
Scanning；Step 2：Apply low-frequency harmonics excitation to the exciting unit of far-field eddy sensor；Step 3：It is circumferential along channel bend
Scanning, measure the phase difference of the signal relative excitation signal received in the receiving coil in receiving unit；Step 4：Pass through sight
Survey and analyze the variation characteristic of phase difference, you can differentiate the corrosion at channel bend and crack defect situation.
The far-field eddy sensor of the present invention furthers far-field region by using outer set-up mode, and by using double excitation,
Measured signal amplitude is improved, so as to solve the problem that inside-through type far-field eddy sensor is difficult to detect channel bend.
Embodiment 2, refering to Fig. 3, far-field eddy sensor of the invention successively with harmonic signal exciting circuit, signal
Reason circuit, A/D change-over circuits are connected with computer, and harmonic signal exciting circuit provides harmonic wave to far-field eddy sensor and swashed
Encourage, far-field eddy sensor is arranged on channel bend outer surface, is vortexed and receives between vortex far-field region to encourage to induce to produce
Coupled magnetic field signal is connect, after being translated into voltage signal, sends signal processing circuit, letter of the signal processing circuit to reception to
Number be amplified, filter, relatively after, send A/D change-over circuits to, A/D change-over circuits convert analog signals into data signal
Send in computer, computer handled the data of reception, so as to obtaining the corrosion of tested pipeline elbow and crack defect
Information.Refering to Fig. 1 to Fig. 5, remaining is the same as embodiment 1.
Embodiment 3, refering to Fig. 1 to Fig. 5, channel bend detection means of the invention by including two identical exciting units and
The far-field eddy sensor 2 that one receiving unit is formed, and two exciting units are located at receiving unit both sides respectively.The excitation is single
Member includes excitation coil 3, and the receiving unit includes receiving coil 4, and the axis of excitation coil 3 is circumferentially disposed along channel bend 1, connects
The axis of take-up circle 4 is radially arranged along channel bend, and receiving coil 4 is positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal.
The far-field eddy sensor 2 includes housing 13, end cap 11, excitation coil 3, receiving coil 4 and socket, and socket can use aviation
The structure type of socket 9, it can also use other structures form；Housing 13 is " ︹ " the type structure for being provided with inner chamber, and both ends are set
Opening is put, end cap 11 coordinates in the opening at the both ends of housing 13；Excitation coil 3 is packed in the inwall of the inner chamber both sides of housing 13
On, receiving coil 4 is packed in the inner chamber Zhong Yao bottoms of housing 13, the lead of excitation coil 3 and receiving coil 4 respectively with socket phase
Even.Also excitation coil 3 is fixed on housing bottom both ends, receiving coil 4 is fixed on housing cavity bottom center.Two excitation coils
3 are preferably symmetricly set on the both sides of receiving coil 4；But the size of current for working as two exciting units is different, that is, two excitations
When different, it can not also use and be symmetrical arranged.
Fig. 4-5 is the sample sketch that apparatus of the present invention are detected, and the corner of channel bend is 90 °, external diameter 80mm, wall
Thickness is 2mm, and the depth of defect is followed successively by 0.25mm, 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm.
As shown in figure 12, when the present invention is measuring and detection coil axis is defect center line, it is measured successively
Phase diagram during corresponding different defects.Phase difference and the approximately linear relation of depth of defect, it is seen that the present apparatus can be carried out effectively
The defects of channel bend, is detected.
After the present invention to far-field eddy sensor by applying harmonic excitation, pass through observation and analyte sensors receiving coil
The variation characteristic of the phase difference of the signal relative excitation signal inside received, obtain the corrosion at channel bend and crack defect
Information.
Embodiment 4, refering to Fig. 1 to Fig. 5, the exciting unit includes excitation coil 3 and screen unit 12, excitation coil 3
In screen unit 12, i.e., screen unit 12 is covered on into the top of excitation coil 3.
The excitation coil 3 can use the silicon steel sheet screen unit 12 that be made of high magnetic permeability to cover, and both shield weakening
Direct-coupling magnetic field, again play a part of assembling excitation field；Use two groups of identical excitation coils and screen unit simultaneously
It is used as excitation, far-field region of effectively furthering, reduces size sensor, also improves the signal amplitude that receiving coil obtains in addition, just
In signal acquisition.
Embodiment 5, refering to Fig. 1 to Fig. 5, the excitation coil 3 uses square coil；Receiving coil 4 uses cylindrical coil.
Embodiment 6, refering to Fig. 1 to Fig. 5, handle 10 is provided with housing 13, hand 10 can pass through hex screw with housing 13
Deng interconnection, end cap 11 can be by being attached with housing 13 including Cross Recess Head Screw etc..
Embodiment 7, refering to Fig. 1 to Fig. 5, the far-field eddy sensor 2 successively with low-frequency harmonics exciting circuit 5, signal
Process circuit 6, A/D change-over circuits 7 are connected with computer 8, and harmonic signal exciting circuit 5 provides to far-field eddy sensor 2
Harmonic excitation, far-field eddy sensor 2 are arranged on the excitation of the outer surface of channel bend 1 and induce generation vortex and receive vortex far-field region
INDIRECT COUPLING magnetic field signal, after being translated into voltage signal, send signal processing circuit 6 to, signal processing circuit 6 is docked
The signal of receipts is amplified, filtered, after comparison, sends A/D change-over circuits 7 to, A/D change-over circuits 7 convert analog signals into
Data signal is sent can use portable computer in computer 8, computer 8, and signal acquisition control, letter are realized by computer 8
The data of reception are handled, differentiate signal characteristic, obtain tested pipeline elbow 1 by number display and the function such as data storage
Defect information.
The present invention furthers far-field region by using double excitation, improves measured signal amplitude, fully demonstrates precursor in far field
Advantage, solve inside-through type far-field eddy sensor and be difficult to the problem that is detected to channel bend, simultaneously, it can also be used to be straight
The detection of pipe.
Claims (9)
1. a kind of channel bend defect inspection method based on far-field eddy, it is characterized in that：Using single including two identical excitations
The far-field eddy sensor that member and a receiving unit are formed, and two exciting units are located at receiving unit both sides respectively, excitation is single
Member and receiving unit are circumferentially disposed along detected channel bend cross section, and receiving unit is positioned at measurement INDIRECT COUPLING magnetic field letter
Number far-field region；After far-field eddy sensor applies harmonic excitation, furthered far-field region using double excitation, improve measured signal
Amplitude；Sensor measures the phase difference for the signal relative excitation signal that receiving unit receives along channel bend scanning direction, from
And obtain the variation characteristic that arrives of phase difference, that is, obtain corrosion and crack defect information at channel bend.
2. the channel bend defect inspection method based on far-field eddy according to claim 1, it is characterized in that：Far-field eddy passes
Sensor is connected with harmonic signal exciting circuit, signal processing circuit, A/D change-over circuits and computer successively, and harmonic signal swashs
Encourage circuit and provide harmonic excitation to far-field eddy sensor, far-field eddy sensor is arranged on channel bend outer surface, with excitation
The INDIRECT COUPLING magnetic field signal for producing and being vortexed and receive vortex far-field region is induced, after being translated into voltage signal, sends letter to
Number process circuit, signal processing circuit is amplified to the signal of reception, filters, relatively after, send A/D change-over circuits, A/D to
Change-over circuit converts analog signals into data signal and sent in computer, and computer is handled data, be tested so as to obtain
The corrosion of channel bend and crack defect information.
3. the channel bend defect inspection method based on far-field eddy according to claim 1, it is characterized in that：The far field whirlpool
Flow sensor is arranged on channel bend（1）On cross section；The exciting unit includes excitation coil（3）, the receiving unit bag
Include receiving coil（4）, excitation coil（3）Axis is along channel bend（1）It is circumferentially disposed, receiving coil（4）Axis is along channel bend
It is radially arranged；Receiving coil（4）Positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal；To sensor excitation coil（3）In
Apply a harmonic excitation, the exciting field of change triggers along channel bend（1）The circumferentially distributed alternating magnetic field in cross section, receive single
Receiving coil in member（4）Positioned at far-field region measure INDIRECT COUPLING magnetic field signal, measured signal relative to pumping signal phase
The change of potential difference shows corrosion or the presence of crack defect, by observing and analyzing the variation characteristic of phase difference so as to realizing pair
Channel bend（1）The detection of defect situation.
4. the channel bend defect inspection method based on far-field eddy according to claim 1, it is characterized in that：Including following step
Suddenly：Step 1：In the circumferentially disposed far-field eddy sensor of channel bend, to be scanned；Step 2：Sensed to far-field eddy
The exciting unit of device applies low-frequency harmonics excitation；Step 3：Along channel bend circumferential scanning, the reception line in receiving unit is measured
The phase difference of the signal relative excitation signal received in circle；Step 4：By observing and analyzing the variation characteristic of phase difference, i.e.,
The corrosion at channel bend and crack defect situation can be differentiated.
5. a kind of channel bend detection means, it is characterized in that：By being formed including two identical exciting units and a receiving unit
Far-field eddy sensor（2）, and two exciting units are located at receiving unit both sides respectively, the exciting unit includes excitation coil
（3）, the receiving unit includes receiving coil（4）, excitation coil（3）Axis is along channel bend（1）It is circumferentially disposed, receiving coil
（4）Axis is radially arranged along channel bend, and receiving coil（4）Positioned at the far-field region of measurement INDIRECT COUPLING magnetic field signal.
6. channel bend detection means according to claim 5, it is characterized in that：The far-field eddy sensor（2）Including shell
Body（13）, end cap（11）, excitation coil（3）, receiving coil（4）And socket；Housing（13）To be provided with " ︹ " type knot of inner chamber
Structure, and both ends set open, end cap（11）Cooperation is arranged on housing（13）In the opening at both ends；Excitation coil（3）It is packed in shell
Body（13）On the inwall of inner chamber both sides, receiving coil（4）It is packed in housing（13）Inner chamber Zhong Yao bottoms, excitation coil（3）With connect
Take-up circle（4）Lead be connected respectively with socket.
7. according to the channel bend detection means of claim 5 or 6, it is characterized in that：Two excitation coils（3）It is symmetricly set on and connects
Take-up circle（4）Both sides.
8. channel bend detection means according to claim 5, it is characterized in that：The far-field eddy sensor（2）Successively with
Low-frequency harmonics exciting circuit（5）, signal processing circuit（6）, A/D change-over circuits（7）And computer（8）It is connected.
9. according to the channel bend detection means of claim 5 or 6, it is characterized in that：Exciting unit includes excitation coil（3）With
Screen unit（12）, excitation coil（3）Installed in screen unit（12）It is interior；The excitation coil（3）Using square coil；Receive
Coil (4) uses cylindrical coil.
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| CN115201326B (en) * | 2022-08-18 | 2024-03-29 | 合肥工业大学 | Defect burial depth multi-parameter identification method based on near-field vortex and far-field vortex |
| CN117110422B (en) * | 2023-10-23 | 2024-01-30 | 国机传感科技有限公司 | Array far-field eddy current data analysis method and system |
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