CN106018542A - Alternating-current magnetic field underwater crack detection device and method - Google Patents
Alternating-current magnetic field underwater crack detection device and method Download PDFInfo
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- CN106018542A CN106018542A CN201610320482.8A CN201610320482A CN106018542A CN 106018542 A CN106018542 A CN 106018542A CN 201610320482 A CN201610320482 A CN 201610320482A CN 106018542 A CN106018542 A CN 106018542A
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Abstract
The invention provides an alternating-current magnetic field underwater crack detection device and method. The device comprises a shell, a transducer housing, a detection module, a data processing module and a waterproof connector; the detection module comprises an exciting circuit and a data acquisition circuit, the exciting circuit is used for generating an alternating-current magnetic field, and the data acquisition circuit is used for obtaining a magnetic field signal, generated by metal to be detected, in the alternating-current magnetic field and converting the magnetic field signal into a voltage signal; the data processing module is used for conducting analog-digital conversion on the voltage signal; the waterproof connector is used for outputting a voltage signal subjected to amplifying processing. According to the alternating-current magnetic field underwater crack detection device and method, the voltage signal, converted in the alternating-current magnetic field, of the metal to be detected is obtained, and then the voltage signal is processed; the processed signal is output through the waterproof connector, therefore, detection of crack information can be completed, and the purpose of conducting alternating-current magnetic field crack detection on a metal structure of which the surface is provided with a coating in a deep-water environment is achieved.
Description
Technical field
The present invention relates to detect equipment technical field, particularly to a kind of ac magnetic field crack detection device under water and side
Method.
Background technology
Alternating current field measurement (Alternating Current Field Measurement, referred to as ACFM), is one
Planting emerging Dynamic Non-Destruction Measurement, this technology is developed by London university Non-Destructive Testing center at first, from alternating current
Potential energy drop method (Alternating Current Potential Drop, referred to as ACPD) technology develops, mainly
May be used for detecting the open-delta winding on conductive metal structure part surface, be particularly well-suited to the protected coating in examined workpiece surface
Situation, the coating for surface protection of workpiece need not be removed, crack detection can be carried out.Its Cleaning Principle is different from other
Electromagnetic nondestructive method, such as Magnetic testing, Magnetic memory testing, remote eddy current detection etc., have detection speed fast,
The plurality of advantages such as qualitative, quantitative once completes.At present, domestic correlational study was carried out for ACFM technology, but
It is typically all about applying ACFM detection technique on land, for the application side of ACFM technology structure under water
Face there is no related data.
ACFM detects the main difficulty faced under water: 1, water conduction, can cause short circuit, so
Water thoroughly must be isolated with the circuit components in sensor wrap.2, the generation of distorted magnetic field signal is by detection mould
Exciting circuit in block is excited by electromagnetic induction, and the existence of metal shell can produce effectiveness, therefore
Nonmetallic materials can only be used between detection module and workpiece to make.3, due to Lift-off effect during electromagnetic induction
Impact, the probe cover thickness of isolation water and detection module is very restricted.If probe cover is thicker, it will serious
Have influence on the Detection results of Metal Crack, and the intensity of shell nonmetallic materials is difficult to individually resist deep water hydraulic pressure.
For the problems referred to above, effective solution is the most not yet proposed.
Summary of the invention
Embodiments provide a kind of ac magnetic field crack detection device under water and method, to solve prior art
In cannot metal structure cated to surface carries out ac magnetic field crack detection in deepwater environment problem.
Embodiments provide a kind of ac magnetic field crack detection device under water, including: housing；Sensor wrap,
It is connected with described housing, is used for placing detection module；Detection module, is positioned at described sensor wrap, including excitation electricity
Road and data acquisition circuit, described exciting circuit is used for producing ac magnetic field, and described data acquisition circuit is used for obtaining
The metal to be measured being positioned in first liquid is produced field signal in described ac magnetic field, and is believed in described magnetic field
Number be converted to voltage signal；Data processing module, is positioned in described housing, communicates with described detection module, for right
Described voltage signal carries out analog digital conversion and signal processing and amplifying；Water-proof connector, is positioned in described housing, with described
Data processing module communicates, the voltage signal after exporting processing and amplifying；Wherein, described housing is filled with second
Liquid, described second liquid is the iknsulating liquid immiscible with described first liquid.
In one embodiment, described sensor wrap is made up of the insulating material of nonferromagnetic.
In one embodiment, in described detection module is removably disposed in described housing.
In one embodiment, described detection module is detachably connected to described data processing module by pan head screw
On.
In one embodiment, described housing is provided with seal, for injecting described second liquid in described housing
Body.
In one embodiment, described first liquid is sea water, and described second liquid is insulating oil.
In one embodiment, the circuit in described housing is connected with external equipment by described water-proof connector.
The embodiment of the present invention additionally provides the method for a kind of ac magnetic field crack detection under water, including: by detection mould
Block excites generation alternation faradic current in metal surface to be measured；While exciting, signal is carried out by described detection module
Detection, obtains and is positioned at the magnetic field letter that metal surface to be measured described in first liquid produces due to alternation faradic current disturbance
Number, and described field signal is converted to voltage signal；Described voltage signal is processed；Voltage after processing
Signal transmits out to ppu.
In one embodiment, specification and the type of described detection module is the electromagnetic attributes according to described metal to be measured
And the thickness of corrosion-inhibiting coating is chosen on described metal to be measured.
In one embodiment, before transmission described voltage signal is processed, including: described voltage signal is entered
Row analog digital conversion and signal processing and amplifying.
In embodiments of the present invention, be provided with in ac magnetic field under water crack detection device housing, detection module,
Data processing module and water-proof connector.First, produce ac magnetic field by being positioned at the detection module of enclosure interior,
Obtain metal to be measured produced field signal in ac magnetic field, and field signal is converted to voltage signal；Again
Utilize data processing module that voltage signal carries out analog digital conversion and signal processing and amplifying；Finally, waterproof company can be passed through
Connect the voltage signal after device output processing and amplifying；Such that it is able to complete the detection of crack information.Utilize this ac magnetic field
Crack detection device carries out crack detection under water, balances deep water hydraulic pressure according to the feature that liquid compressibility is low, ensures
The sensor wrap structural safety when deep water works；By the most only to the stimulating module in detection module and data processing module
Erect meter, the purpose being convenient for changing can be reached, metal cated to surface in deepwater environment may finally be realized
Structure carries out the purpose of ac magnetic field crack detection.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings:
Fig. 1 is a kind of structured flowchart of the ac magnetic field crack detection device under water of the embodiment of the present invention；
Fig. 2 is a kind of flow chart of the ac magnetic field crack detecting method under water of the embodiment of the present invention；
Fig. 3 is the top view of the ac magnetic field crack detection device under water of inventive embodiments；
Fig. 4 is the sectional view of the ac magnetic field crack detection device under water of inventive embodiments.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing,
The present invention is described in further details.Here, the exemplary embodiment of the present invention and explanation thereof are used for explaining this
Bright, but not as a limitation of the invention.
Whether alternating current field measurement exists crackle mainly for detection of conductive metal structure part surface, be particularly well-suited to by
The situation of the inspection protected coating of surface of the work.Specifically, alternating current field measurement technology refers to be tied by detection metal
The change of component surface induced field, it is judged that the existence situation of hardware face crack.Therefore, metal is being judged
When structural member surface crackle exists situation, how the change in effective acquisition hardware surface induction magnetic field i.e. detects mould
Block carries out the collection of crack information the most efficiently and transmits particularly significant.
Specifically, using ac magnetic field to carry out crack detection when, should be noted that problems with: detection module
Can not excessive, can not be the most heavy；Owing to the excitation of detecting element and the collection of crack data are all for electromagnetic signal,
Therefore, sensor wrap can only be with the nonferromugnetic material manufacture of electric insulation；Due to the impact of electromagnetism Lift-off effect, pass
The thickness of sensor cover is usually no more than 1mm；Detection different magnetic attribute, different-thickness coating metal material when,
Typically require the detection module changing different parameters, to obtain optimum detection effect.Therefore, to conductive gold under water
The when that genus structural member surface carrying out crack information collection, how making detection module shell high pressure resistant and easily-disassembled is to solve
The key of alternating current field measurement problem the most under water.
The embodiment of the present invention provides a kind of ac magnetic field crack detection device under water, as it is shown in figure 1, this alternating electromagnetic
Field crack detection device under water includes: housing 101, sensor wrap 102, detection module 103, data processing module
104 and water-proof connector 105.Below in conjunction with Fig. 1, each ingredient in this system is specifically described:
1) housing 101；
2) sensor wrap 102, are connected with described housing 101, are used for placing detection module；
2) detection module 103, are positioned at described sensor wrap 102, including exciting circuit and data acquisition circuit,
Described exciting circuit is used for producing ac magnetic field, and described data acquisition circuit is for treating that acquisition is positioned in first liquid
Survey metal produced field signal in described ac magnetic field, and described field signal is converted to voltage signal；
3) data processing module 104, are positioned in described housing 101, communicate with described detection module 103, be used for
Described voltage signal is carried out analog digital conversion and signal processing and amplifying；
4) water-proof connector 105, are positioned in described housing 101, communicate with described data processing module 104, use
Voltage signal after output processing and amplifying；
Wherein, being filled with second liquid in described housing, described second liquid is immiscible with described first liquid exhausted
Edge liquid.
In the above-described embodiments, be provided with in the device of ac magnetic field crack detection under water housing, sensor wrap,
Detection module, data processing module and water-proof connector.Exchange is produced by being positioned at the detection module of sensor wrap
Electromagnetic field, obtains the metal to be measured being positioned in first liquid produced field signal in ac magnetic field, and by magnetic
Field signal is converted to voltage signal；Then, data processing module is utilized to be amplified voltage signal processing；Finally,
By the voltage signal after water-proof connector output processing and amplifying.Wherein, housing is filled with second liquid, its viscosity
More than first liquid and the two is immiscible.
By by the way of filling second liquid in housing, utilize the feature that liquid compressibility is little to balance deep water pressure
Power, such that it is able to protection ac magnetic field crack detection device under water；By in housing, fill that insulating properties is good the
The mode of two liquid, insulating properties good between each component in thereby may be ensured that housing.Utilize this alternating electromagnetic
The face crack of the field detection hardware of crack detection device under water, it is possible to achieve do not carry out on examined workpiece surface appointing
In the case of the reason of where, in deepwater environment, metal structure cated to surface carries out ac magnetic field crack detection
Purpose.
Further, utilize ac magnetic field to carry out crack detection under water and refer to the incentive action at ac magnetic field
Under, hardware surface to be measured produces faradic current, and faradic current excites generation induced field.Hardware table
The faradic disturbance in face, such as gathering and evacuation etc., can directly cause in hardware near surface space and sense
Changes of magnetic field, can obtain the crack length on hardware surface, crackle by the changes of magnetic field in measurement space deep
The information such as degree.Specifically, when hardware surface to be measured does not has crack defect when, faradic current is tied at metal
Component surface is parallel and is uniformly distributed；When hardware surface to be measured exists crack defect when, due to fault location
Being nonconducting, therefore faradic current can flow through along Defect Edge, thus can produce current disturbing.Current disturbing
Two aspects can be shown: one is the rotation effect that electric current walks around that defect generation is certain；Two is the most equally distributed
Surface current can produce uneven distribution near defect, is i.e. closing on hardware surface crack defect edge to be measured
Place densely distributed, sparse in defect intermediate distribution.It is important to note, however, that this ac magnetic field crackle under water
Detection device can be used for the hardware to be measured of land is carried out crack detection equally, and this specific embodiment is only
It is in order to the present invention is better described, is not intended that inappropriate limitation of the present invention.
Above-mentioned housing is made up of the nonmetallic materials of electric insulation, and it is internally provided with data processing module and waterproof
The parts such as adapter；Meanwhile, housing is provided with seal.Before carrying out crack detection test, can be by close
Second liquid is injected in sealing in housing, utilizes sealing screw to seal housing after filling, and meanwhile, is sealing spiral shell
The junction of nail and housing can utilize O RunddichtringO to carry out water-proofing treatment.In the present embodiment, crack detection examination
Test and carry out in first liquid, and housing fills second liquid, therefore, it can utilize liquid pressurized time-varying
The feature that shape is little resists deep-water pressure.Detection module volume is little and high pressure resistant, and shell nonmetallic materials are deeply
Also it is unlikely to be damaged by hydraulic pressure during water environment work, such that it is able to solve when utilizing ac magnetic field crack detection under water to fill
Put the defect that when carrying out crack detection, detection module is overweight.Owing in housing, the viscosity of second liquid is more than first liquid,
And the iknsulating liquid that compressibility that second liquid is immiscible with first liquid is less, thus, even if housing seal
Place is slight lost efficacy, and is not easy to cause first liquid to enter enclosure interior circuit and causes electrical equipment to damage, thus improves further
This ac magnetic field crack detection device under water carries out the reliability of crack detection work under water.
Above-mentioned first liquid can be sea water, and second liquid can be insulating oil.Specifically, what can liquid conduct electricity sentences
Disconnected according in mainly detection liquid either with or without whether the ion that can move freely, i.e. liquid exist positively charged or
The microgranule of negative electricity.Such as, various crude mineral oils, silicone oil, trichloro biphenyl, vegetable oil etc. are all that the insulator of electricity is
Iknsulating liquid；Various liquid metals (such as hydrargyrum), water, most aqueous solution are all the conductors of electricity, i.e. conductive liquid
Body.The mode sealed again after enclosure interior fills insulating oil is used to carry out water-proofing treatment.According to insulating oil pressurized time-varying
The feature that shape is little resists the deep-water pressure suffered by housing, such that it is able to design, volume is little and high voltage bearing detection mould
Block；Simultaneously as the insulation oil viscosity of filling is more than sea water and both are immiscible, thus can effectively prevent
Only hardware circuit is damaged by sea water intrusion enclosure interior, such that it is able to it is the most heavy to solve detection module in prior art
The defect of weight.By by the way of filling second liquid in housing, the feature utilizing liquid compressibility little balances deeply
Water pressure, such that it is able to protection ac magnetic field crack detection device under water；Good by filling insulating properties in housing
The mode of second liquid, insulating properties good between each component in thereby may be ensured that housing.But it is worth note
Meaning, above-mentioned first liquid can be the liquid such as other kinds of aqueous solution, liquid metal, and above-mentioned second liquid can
To be the iknsulating liquid such as silicone oil, vegetable oil, as long as the viscosity meeting second liquid is more than first liquid, and the second liquid
The requirement of the iknsulating liquid that compressibility that body is immiscible with first liquid is less, the present embodiment is intended merely to more
Well the present invention is described, is not intended that inappropriate limitation of the present invention.
Above-mentioned detection module is positioned at inside sensor wrap, can include exciting circuit and data acquisition circuit.Wherein,
Exciting circuit may be used for producing ac magnetic field, and data acquisition circuit may be used for obtaining treating of being positioned in first liquid
Survey metal produced magnetic field sensor signal in ac magnetic field, and will by the measuring bridge in data acquisition circuit
Field signal is converted to voltage signal.It is important to note, however, that during carrying out crack detection test, it is possible to
To use by the probe of mechanical arm clamps, or the probe etc. that multiple detection coil forms side by side carries out alternating electromagnetic
Field detection, this specific embodiment is intended merely to the present invention is better described, is not intended that inappropriate limitation of the present invention.
During carrying out alternating current field measurement, above-mentioned detection module may be used for obtaining and is positioned in first liquid
Metal to be measured is produced field signal in ac magnetic field, can obtain gold by the change in magnetic field in measurement space
Belong to the information such as structural member surface crack length, the degree of depth.In the present embodiment, it is possible to use in measuring bridge measurement space
The situation of change in magnetic field, is converted to voltage signal by field signal, such that it is able to realize changes of magnetic field situation in space
Monitoring.
The outside of detection module is provided with sensor wrap, and wherein, the material of sensor wrap is identical with the material of housing, all
It is made up of the insulating material of nonferromagnetic.But, owing to alternating current field measurement can be imitated by electromagnetism lift-off
Answering and the impact of electromagnetic induction, for ensureing Detection results, in sensor wrap and hardware surface to be measured directly connects
The thickness that contact portion is divided is usually no more than 1mm.
Above-mentioned data processing module may be used for the voltage signal obtained by above-mentioned detection module is carried out analog digital conversion with
And signal processing and amplifying, the process i.e. voltage signal being processed according to various intended purposes and requirement, namely
Voltage signal is processed, in order to extract the process of useful information, it be signal extracted, convert,
The general designation of processing procedure such as analyze, comprehensive.
Pan head screw can be set between detection module and data processing module, be used for fastening at detection module and data
Reason module, the most above-mentioned detection module is removably disposed in sensor wrap.Use modularized design, at data
Reason module carries out interference fits with detection module employing pan head screw and is connected, it is simple to takes out detection module at any time and keeps in repair
And it is easy to change at any time the detection module of different detection parameter, such that it is able to solve when utilizing ac magnetic field to split under water
When stricture of vagina detection device carries out crack detection, the problem that detection module is the most easily-disassembled.
Above-mentioned water-proof connector may be used for exporting the voltage letter after data processing module processes to ppu
Number.After ppu receives voltage signal, can be further analyzed processing to it, thus finally real
The purpose now crackle on hardware surface under water detected.
Applying ac magnetic field to carry out crack detection test under water when, can first belong to according to the electromagnetism of metal to be measured
Property and metal to be measured on corrosion-inhibiting coating thickness select detection module；After installing, then by seal to housing
Interior injection insulating oil, and utilize pan head screw that detection module and data processing module are sealed；Finally, utilize
This ac magnetic field crack detection device under water carries out concrete crack information collection transmission and crack detection.
In embodiments of the present invention, it is also proposed that the method for a kind of ac magnetic field crack detection under water, its core thinking
It is to utilize feature that liquid compressibility is low to balance deep water hydraulic pressure, ensures that the sensor wrap structure when deep water work is pacified
Entirely；Stimulating module in detection module and data processing module are independently designed, the mesh being convenient for changing can be reached
's.Specifically, as in figure 2 it is shown, may comprise steps of:
Step 201: excite generation alternation faradic current in metal surface to be measured by detection module；
Step 202: carry out signal detection while exciting by described detection module, obtains and is positioned in first liquid
The field signal that described metal surface to be measured produces due to alternation faradic current disturbance, and described field signal is converted to
Voltage signal；
Step 203: described voltage signal is processed；
Step 204: the voltage signal after processing transmits out to ppu.
Specifically, carrying out ac magnetic field crack detection under water when, it is positioned at first being obtained by detection module
Metal to be measured in liquid is produced field signal in ac magnetic field, and described field signal is converted to voltage
Before signal, first can choose inspection according to the thickness of corrosion-inhibiting coating in the electromagnetic attributes of metal to be measured and metal to be measured
Survey specification and the type of module；Injecting liquid in housing by seal again, wherein, this liquid can be viscosity
More than the insulating oil of seawater viscosity, and it is carried out encapsulation process, such that it is able to reach waterproof purpose；Further,
Detection module includes exciting circuit and data acquisition circuit, can be produced by the exciting circuit in detection module and act on
Ac magnetic field on metal to be measured, then obtain metal to be measured at alternating current by the data acquisition circuit in detection module
Produced field signal in magnetic field；Voltage signal is carried out recycling data processing module analog digital conversion and signal is put
Big process；Finally, by water-proof connector, amplification can have been carried out the voltage signal after processing to export to external treatment
Device.
It is the top view of the ac magnetic field crack detection device under water of the embodiment of the present invention as shown in Figure 3, such as Fig. 4
Shown in be the sectional view of ac magnetic field crack detection device under water of the embodiment of the present invention.Wherein, 2 represent coiled hair spiral shell
Nail, 4 represent water-proof connector (being equivalent to 105 in Fig. 1), and 5 represent connector holder, and 6 represent O RunddichtringO,
7 expression adapter nuts, 8 expressions housing (being equivalent to 101 in Fig. 1), 9 expression data processing circuit plates, 10
Representing O RunddichtringO, 11 represent sensor wrap (being equivalent to 102 in Fig. 1), and 12 represent chip carrier, 13 tables
Showing O RunddichtringO, 14 represent sealing screw, wherein, connector holder 5, adapter nut 7, housing 8, isolation
Module 11, chip carrier 12 material identical, be all by the nonmetallic materials manufacture of solenoid isolation.
When carrying out the experiment of ac magnetic field crack detection under water, detection can be selected according to the electromagnetic attributes of metal to be measured
Module, is fastened detection module and data processing module by pan head screw 2, then by sealing screw 14
Seal in housing 8, inject insulating oil, sealed by sealing screw 14 after filling, junction O type
Sealing ring 13 carries out water-proofing treatment.Said apparatus is put into water carries out ac magnetic field crack detection under water, finally
By water-proof connector 4, crack information is transmitted to ppu, carry out the most again at further crack detection
Reason.If needing again to observe, repeat aforesaid operations.This structure has rational in infrastructure, simple to operate, measurement
Precision is high, detachable, and the feature that experiment information is abundant.
As can be seen from the above description, the embodiment of the present invention achieves following technique effect: at ac magnetic field
Crack detection device is provided with housing, detection module, data processing module and water-proof connector under water.First,
Produce ac magnetic field by being positioned at the detection module of enclosure interior, obtain metal to be measured and produced in ac magnetic field
Field signal, and field signal is converted to voltage signal；Recycling data processing module carries out mould to voltage signal
Number conversion and signal processing and amplifying；Finally, can be by the voltage signal after water-proof connector output processing and amplifying；From
And the detection of crack information can be completed.This ac magnetic field crack detection device under water is utilized to carry out crack detection, root
Balance deep water hydraulic pressure according to the feature that liquid compressibility is low, ensure the sensor wrap structural safety when deep water works；
Stimulating module in detection module and data processing module are independently designed, the purpose being convenient for changing can be reached,
Metal structure cated to surface in deepwater environment may finally be realized and carry out the mesh of ac magnetic field crack detection
's.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.All within the spirit and principles in the present invention,
Any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. an ac magnetic field crack detection device under water, it is characterised in that including:
Housing；
Sensor wrap, is connected with described housing, is used for placing detection module；
Detection module, is positioned at described sensor wrap, including exciting circuit and data acquisition circuit, described exciting circuit
For producing ac magnetic field, described data acquisition circuit is for obtaining the metal to be measured being positioned in first liquid described
Produced field signal in ac magnetic field, and described field signal is converted to voltage signal；
Data processing module, is positioned in described housing, communicates with described detection module, for entering described voltage signal
Row analog digital conversion and signal processing and amplifying；
Water-proof connector, is positioned in described housing, communicates with described data processing module, after being used for exporting processing and amplifying
Voltage signal；
Wherein, being filled with second liquid in described housing, described second liquid is immiscible with described first liquid exhausted
Edge liquid.
2. ac magnetic field crack detection device under water as claimed in claim 1, it is characterised in that described sensing
Device cover is made up of the insulating material of nonferromagnetic.
3. ac magnetic field crack detection device under water as claimed in claim 1, it is characterised in that described detection
Module is removably disposed in described sensor wrap.
4. ac magnetic field crack detection device under water as claimed in claim 1, it is characterised in that described detection
Module is detachably connected on described data processing module by pan head screw.
5. ac magnetic field crack detection device under water as claimed in claim 1, it is characterised in that described housing
On be provided with seal, for injecting described second liquid in described housing.
6. the crack detection device under water of the ac magnetic field as according to any one of claim 1 to 5, its feature exists
In, described first liquid is sea water, and described second liquid is insulating oil.
7. the crack detection device under water of the ac magnetic field as according to any one of claim 1 to 5, its feature exists
In, the circuit in described housing is connected with external equipment by described water-proof connector.
8. the ac magnetic field utilized according to any one of claim 1 to 7 crack detection device under water is carried out
The method of ac magnetic field crack detection under water, it is characterised in that including:
Generation alternation faradic current is excited in metal surface to be measured by detection module；
While exciting, carry out signal detection by described detection module, obtain and be positioned at gold to be measured described in first liquid
The field signal that metal surface produces due to alternation faradic current disturbance, and described field signal is converted to voltage signal；
Described voltage signal is processed；
Voltage signal after processing transmits out to ppu.
9. method as claimed in claim 8, it is characterised in that the specification of described detection module and type are roots
Choose according to the thickness of corrosion-inhibiting coating in the electromagnetic attributes of described metal to be measured and described metal to be measured.
10. method as claimed in claim 8, it is characterised in that described voltage signal is processed, including:
Described voltage signal is carried out analog digital conversion and signal processing and amplifying.
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| CN112858467A (en) * | 2021-04-09 | 2021-05-28 | 中国石油大学(华东) | Rotating electromagnetic field pipeline crack detection probe and detection system in any direction |
| CN112924537A (en) * | 2021-01-14 | 2021-06-08 | 中国石油天然气集团有限公司 | Underwater array type alternating current electromagnetic field crack detection probe device and system |
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