CN108225228B - Electromagnetic ultrasonic thickness measuring transducer structure for detecting inside of circular pipeline - Google Patents
Electromagnetic ultrasonic thickness measuring transducer structure for detecting inside of circular pipeline Download PDFInfo
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- CN108225228B CN108225228B CN201810332253.7A CN201810332253A CN108225228B CN 108225228 B CN108225228 B CN 108225228B CN 201810332253 A CN201810332253 A CN 201810332253A CN 108225228 B CN108225228 B CN 108225228B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
Abstract
The invention belongs to the field of electromagnetic ultrasonic detection, and relates to an electromagnetic ultrasonic thickness measuring transducer structure for detecting in a circular pipeline, which comprises a handle, a coil, a protective cylinder and a magnet, wherein a connecting steel ring is connected to one end of the handle, the magnet is a hollow cylindrical magnet formed by trisection combination in the circumferential direction, the magnet is fixed between the connecting steel ring and a fixed steel ring, the protective cylinder is sleeved outside the magnet and is tightly attached to the magnet, the protective cylinder is internally provided with the annular coil, the leads of the coil are wound and arranged in the same direction at equal intervals, and the current directions of the adjacent leads are the same. Alternating current is supplied to the coil, and eddy current is formed inside the near surface of the workpiece; the magnet generates a bias magnetic field, and the alternating eddy current is subjected to alternating Lorentz force under the action of the bias magnetic field; the eddy current particles form mechanical vibration under the action of alternating Lorentz force, and ultrasonic waves are generated to further finish the judgment of the thickness of the pipeline under different conditions.
Description
Technical Field
The invention belongs to the field of application of electromagnetic ultrasonic nondestructive testing technology, and particularly relates to a thickness measuring transducer structure for detecting electromagnetic ultrasonic thickness in a circular pipeline.
Background
Metals are one of the earliest materials for human application, and the improvement of smelting, processing and application technologies is accompanied with the forward development of human history. Modern people's life can not leave metal, and metal plays a vital role in modern industry. The application of the metal material relates to various fields of national economy: high-rise buildings, deep underground and marine facilities, large-span heavy-duty bridges, light energy-saving automobiles, high-speed ships, oil exploitation and long-distance oil and gas conveying pipelines, large-scale storage containers, engineering machinery, precision instruments, aerospace, high-speed railways, energy facilities and the like. Therefore, the metal material not only relates to the national economic development, but also plays a role in maintaining the national safety. Metal plates such as steel plates and aluminum plates are the most basic industrial raw materials, and are used in various fields such as oil and gas pipelines, airplanes, ships, and automobiles. The thickness is an important quality and safety index in the processing process of plates and the service period of pipelines and chemical equipment. In the rolling process of the steel plate, the thickness of the plate needs to be detected constantly, and once the thickness value deviates from a standard value too much, system parameters need to be adjusted timely, so that the rolled plate has the consistency of quality. If the service pipeline is affected by corrosion and the like, the thinning characteristic exists, the detection of the residual thickness of the pipeline is an important link for ensuring the safe production, the thickness of the pipeline needs to be monitored at regular time, once a problem is found, relevant measures are taken immediately, the loss of personnel and property is avoided, and the irreversible influence on the environment is further avoided. Therefore, the detection research on the thickness of the metal plate has important significance for the development of modern industry.
Common thickness detection methods can be divided into: eddy current, laser, ray and ultrasonic methods. The ray method utilizes the penetrability of X rays, has low requirement on a detected workpiece, can be used for thickness detection of complex composite materials and the like, but a radioactive source can bring harm to a human body, has high requirement on protection during detection, and has high detection environment and protection cost on site when the method is applied, thereby being not beneficial to popularization and use under common conditions. The laser method is to measure the thickness of an object by using the interference characteristic and the pointing characteristic of light. The repeatability of the detection is very high, and the method has a wide application range. However, there is a certain requirement for the moving speed of the object to be detected, and due to the characteristics of the laser, the signal extraction and data processing of the detection system are complicated. The eddy current principle is based on the eddy current effect of the metal surface, so that the eddy current principle has application value only for thin plates, coatings and the like, and the efficiency is not ideal. Compared with the three detection methods, the thickness detection by utilizing the characteristics of the ultrasonic waves has the advantages of simple wave emission and recovery, good repeatability, low requirement on workpieces, strong anti-interference energy and wide applicable environment. The ultrasonic method is sought by people in the aspects of metal nondestructive testing and thickness measurement. Ultrasonic waves are increasingly studied in the directions of industry, medical treatment, ocean exploration and the like, and are widely applied to related fields.
The traditional piezoelectric ultrasonic detection method is a mature nondestructive detection method and works by utilizing the piezoelectric effect of piezoelectric ceramics. The transducer has the characteristics of simple structure, high energy conversion efficiency, convenient use and the like, and is widely applied to various fields. However, the couplant is required to be used in the using process, and the couplant has the characteristics of instability and volatility at high temperature, so that the couplant cannot be applied to high-temperature detection. And the surface of the object to be detected is higher in requirement during detection, and once the surface smoothness is not enough, the object needs to be polished, so that the application of the piezoelectric ultrasonic in the aspect of online detection is greatly limited.
Electromagnetic ultrasound (EMAT for short) is a new technology appearing in the field of nondestructive testing, and the technology excites and receives ultrasonic waves by using an electromagnetic coupling method. Compared with the conventional ultrasonic detection, the electromagnetic ultrasonic detection has the following advantages: 1. and (3) non-contact detection without a coupling agent. 2. The generated waveform has various forms and is suitable for surface defect detection. When the EMAT meets certain excitation conditions in the detection process, surface waves, SH waves, Lamb waves and the like can be generated, and the selection of a waveform mode can be realized. 3. Is suitable for high-temperature detection. 4. The requirement on the surface quality of the detected workpiece is not high. 5. The detection speed is high. 6. The acoustic wave travels far. 7. The number of channels and probes used is small. 8. The capability of finding natural defects is strong, and the EMAT can accurately find the defects which exist on the surface of the steel pipe and are difficult to detect such as folds, heavy skins, holes and the like. Therefore, in industrial application, electromagnetic ultrasound is receiving more and more attention and attention, and the application of ultrasonic flaw detection has been expanded to the fields of high temperature, high speed and on-line detection, and is one of the development leading technologies of nondestructive testing.
The Shanghai university of traffic's Juepen culture and its student Rewling deeply analyze the physical process of the electromagnetic ultrasonic transducer, give the electromagnetic field, the force field generated by the interaction of the electromagnetic field and the substance, and the partial differential expression of the ultrasonic field, deduce the complete mathematical model and boundary condition of the electromagnetic ultrasonic transducer, and carry out the overall design and experiment of the electromagnetic ultrasonic transducer exciting the lamb wave detection pipeline. The method is characterized in that finite element analysis solving is carried out on an electromagnetic ultrasonic transducer based on Lorentz force by using software of professor of Wang Shujuan of Harbin industry university and students' Kanghui, Lizhiqiao and the like, optimized design is carried out on an electromagnetic ultrasonic probe of surface waves and lamb waves, the electromagnetic ultrasonic transducer is also applied to nondestructive testing of steel rails, train wheel pairs, pipelines and aluminum plates, and the influence of various parameters of a detection system on the transduction efficiency of the electromagnetic ultrasonic transducer is analyzed in detail. However, in the past research, the design research is not carried out on the electromagnetic ultrasonic thickness measuring transducer which can be applied to the practical situations of industrial production, real-time monitoring and the like. In practical application, various environmental changes such as large humidity change, large temperature difference, dustiness, accidental mechanical collision and the like are possibly required, and the designed electromagnetic ultrasonic thickness measuring transducer can always keep high reliability and high accuracy of detection in a variable practical production detection environment.
Disclosure of Invention
Object of the Invention
In order to realize the measurement of the thickness of the circular pipeline, the precision of the circular pipeline in thickness measurement detection is improved, the reliability of a measurement result is improved, and the service life of the coil in engineering application is prolonged. The utility model provides a detect electromagnetism supersound thickness measurement transducer structure in circular pipeline guarantees to have high reliability and high accuracy in the actual industrial production.
Technical scheme
The utility model provides a detect electromagnetism supersound thickness measurement transducer structure in circular pipeline, includes handle, coil, a protection section of thick bamboo and magnet, its characterized in that: the connecting steel ring is connected to one end of the handle, the magnet is a hollow cylindrical magnet formed by trisection combination in the circumferential direction, the magnet is fixed between the connecting steel ring and the fixing steel ring, the protecting cylinder is sleeved outside the magnet and is tightly attached to the magnet, an annular coil is arranged in the protecting cylinder, and leads of the coil are wound and arranged in the same direction at equal intervals.
The protection cylinder comprises an inner protection cylinder and an outer protection cylinder, the inner protection cylinder is located on the inner side of the coil, and the outer protection cylinder is located on the outer side of the coil.
The handle is of a circular tubular structure, and an extension handle is connected with the inner thread of the handle.
The extension handle is of a cylindrical structure, one end of the extension handle is provided with an extension handle threaded connection end, the diameter of the extension handle threaded connection end is larger than other parts of the extension handle, and the extension handle threaded connection end is connected with the inner thread of the handle in a matched mode.
The end part of the handle on the side of the connecting steel ring extends out of an adjusting end which is integrated with the handle and has a diameter smaller than the outer diameter of the handle, the adjusting end is provided with external threads, the adjusting end is in threaded connection with a fixing ring, one side of the connecting steel ring on the handle is provided with a fixing groove, the position of the fixing groove corresponds to the annular wall of the fixing ring, and the fixing ring can be screwed into the fixing groove; the end of the adjusting end protrudes out of a steel ring connecting end which is provided with an open cylindrical connecting cavity, the connecting steel ring is provided with a cylindrical connecting end, and the cylindrical connecting end is clamped in the cylindrical connecting cavity.
The wire cladding that the coil was drawn has a mounting, connects the steel ring and is equipped with a mounting recess, and the mounting is located the mounting recess, and mounting one end is equipped with the wire passageway other end and is equipped with the connector fixed slot, and the wire passageway communicates with the connector fixed slot, and the connector is installed to the connector fixed slot, and the wire that the coil was drawn passes the mounting and is connected fixedly together with the connector.
The connecting steel ring, the magnet, the protection cylinder, the coil and the fixing steel ring are fastened through screws or bolts.
The coil is an annular coil formed by a single wire, and the coil is arranged in a single circumferential winding mode.
The coil is an annular coil consisting of two or more wires, and the coil is formed by arranging a plurality of circumferential winding types.
A single lead of the coil is a flat lead formed by arranging and fixing a plurality of thin leads.
Advantages and effects
The invention discloses a transducer structure for detecting electromagnetic ultrasonic thickness measurement in a circular pipeline, which has the following advantages:
the fixed cylinder of the transducer is designed and made of insulating resin materials, has certain flexibility and viscosity, can ensure that the coil, the fixed cylinder, the magnet and the fixed cylinder are mutually attached without gaps, improves the measurement precision and the system reliability, can buffer the thermal shock and the mechanical impact, protects the coil, prolongs the service life of the coil and realizes the engineering detection application;
the design and use of the coils with different wiring modes can meet the requirements of actual engineering detection, and the design of a receiving-transmitting integrated type or a receiving-transmitting separated type coil can be selected to flexibly meet the requirements of measuring the thickness under different conditions;
the flexible handle structure design can lead the structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline to detect in the pipeline with angle and depth.
Drawings
FIG. 1 is a general assembly drawing of the present invention;
FIG. 2 is an exploded view of the structure of the present invention;
FIG. 3 is a view showing the state that the connecting steel ring is fixed by the fixing ring;
FIG. 4 is a view showing the state that the fixing ring is separated from the connecting steel ring after being rotated;
FIG. 5 is a view showing the state of the connecting steel ring when the fixing ring is separated from the connecting steel ring after rotating;
FIG. 6 is a connecting structure of the fixing ring and the connecting steel ring;
FIG. 7 is a diagram of a transmit-receive integral thickness measuring coil;
FIG. 8 is a structural diagram of a fixing member for matching a thickness measuring coil of the transceiver;
FIG. 9 is a view of the connector structure;
FIG. 10 is a diagram of a transmit-receive split thickness coil;
fig. 11 is a cross-sectional view of a single wire.
Description of reference numerals:
1. the novel connector comprises a handle, a connecting steel ring 2, a magnet 3, a protection cylinder 4, an inner protection cylinder 4-1, an outer protection cylinder 4-2, a coil 5, a fixing steel ring 6, a fixing piece 7, a fixing piece 8, an extension handle 9, a fixing ring 10, an extension handle threaded connection end 11, an adjusting end 12, a fixing groove 12, a cylindrical connection cavity 13, a cylindrical connection end 14, a fixing piece groove 15, a steel ring connection end 16, a lead channel 17, a connector fixing groove 18 and a connector 19.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9 and fig. 10, the structure of the electromagnetic ultrasonic thickness measuring transducer for detecting inside of a circular pipeline comprises a handle 1, a coil 5, a protective cylinder 4 and a magnet 3, wherein the protective cylinder 4 comprises an inner protective cylinder 4-1 and an outer protective cylinder 4-2, the inner protective cylinder 4-1 is positioned at the inner side of the coil 5, and the outer protective cylinder 4-2 is positioned at the outer side of the coil 5. Connect steel ring 2 and connect in the one end of handle 1, handle 1 is the pipe column structure, and handle 1 internal thread is connected with extension handle 8. Extension handle 8 is the cylinder type structure, and one end is equipped with extension handle threaded connection end 10, and extension handle threaded connection end 10 diameter is greater than other parts of extension handle 8, and extension handle threaded connection end 10 is connected with 1 interior screw-thread fit of handle, and the screw thread structural design of extension handle 8 part, only one end have the screw thread to make it screw in and screw out more easily. An adjusting end 11 which is smaller than the outer diameter of the handle 1 and is integrated with the handle 1 is extended out of the end part of the handle 1 on the side of the connecting steel ring 2, the adjusting end 11 is provided with external threads, the adjusting end 11 is in threaded connection with a fixing ring 9, a fixing groove 12 is arranged on one side of the handle 1 of the connecting steel ring 2, the position of the fixing groove 12 corresponds to the ring wall of the fixing ring 9, and the fixing ring 9 can be screwed into the fixing groove 12; the end part of the adjusting end 11 is protruded with a steel ring connecting end 16, the steel ring connecting end 16 is provided with an open cylindrical connecting cavity 13, the connecting steel ring 2 is provided with a cylindrical connecting end 14, the cylindrical connecting end 14 is clamped in the cylindrical connecting cavity 13, and the connecting steel ring 2 can realize rotation and convenient installation and combination through the structure. The magnet 3 is a hollow cylindrical magnet formed by circumferentially trisecting and combining the magnets, the magnet 3 is fixed between the connecting steel ring 2 and the fixing steel ring 6, the protecting cylinder 4 is sleeved outside the magnet 3 and clings to the magnet 3, the protecting cylinder 4 is internally provided with an annular coil 5, leads of the coil 5 are wound and arranged in the same direction at equal intervals, and the current directions of adjacent leads are the same. The connecting steel ring 2, the magnet 3, the protective cylinder 4, the coil 5 and the fixed steel ring 6 are fastened through screws or bolts. The lead led out by the coil 5 is coated with a fixing piece 7, the connecting steel ring 2 is provided with a fixing piece groove 15, the fixing piece 7 is positioned in the fixing piece groove 15, one end of the fixing piece 7 is provided with a lead channel 17, the other end of the fixing piece 7 is provided with a connector fixing groove 18, the lead channel 17 is communicated with the connector fixing groove 18, a connector 19 is installed on the connector fixing groove 18, and the lead led out by the coil 5 penetrates through the fixing piece 7 to be fixedly connected with the connector. The coil 5 is an annular coil formed by a single wire, two wires or a plurality of wires, and the coil is arranged in a circumferential winding manner. As shown in fig. 11, the single wire of the coil 5 is a flat wire formed by arranging and fixing a plurality of thin wires. The protective cylinder 4 and the fixing member 7 are made of an insulating resin material. The insulating resin material has the characteristics of good flexibility and high viscosity, can be tightly attached to the magnet, does not generate gaps, does not influence the precision of the electromagnetic ultrasonic transducer, has good electrical performance and low heat release performance, ensures that the use of the fixed cylinder does not influence the stability of a system, and only replaces coils when the coils are damaged, thereby reducing the cost.
The protective cylinder 4 may be a separate protective cylinder or a protective cylinder in which the coil is integrally covered by casting. The pouring type protective cylinder is made of soft and semi-soft insulating resin materials and poured into an unfilled system, a coil which is tightly wound is poured into the pouring type fixed cylinder, the stress of the soft and semi-soft insulating resin systems on parts is minimum, the thermal shock and mechanical impact which are received can be buffered, the pouring type fixed cylinder is simple to install, no gap exists between the fixed cylinder and the coil, higher precision and stability can be guaranteed, and dislocation can not be generated along with the increase of the number of times of impact.
When the electromagnetic ultrasonic transducer detects in the pipe, the bias magnetic field that requires magnet to produce forms radial magnetic induction line, and the magnet shape needs to be designed into cylindrically, in actual course of working, can't magnetize cylindrical magnet steel, and magnet design segmentation is to the magnet steel magnetization processing respectively, does the arc with each section magnet surface and handles, and several sections magnet amalgamation become cylindrical magnet.
The protection cylinder is provided with a plurality of air holes, and the air holes are vibrated by the device to ensure the balance of air pressure in the inner cavity of the transducer and the air pressure outside the transducer, so that the shape stability of the coil is kept, and the detection accuracy is ensured.
The working principle of the invention is as follows:
the structural coils of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline are arranged in the circumferential direction, the current directions of adjacent wires are the same, and alternating current is supplied to the coils during detection to form eddy current inside the near surface of a workpiece; the magnet generates a bias magnetic field, the direction of the magnetic induction line points to the outside, and the alternating eddy current is subjected to alternating mechanical force under the action of the bias magnetic field; the eddy current mass point forms mechanical waves under the action of alternating mechanical force, ultrasonic waves are generated, and the thickness of the pipeline can be measured. The inner and outer fixed cylinders enable no gap to exist between the coil and the magnet, the measuring precision and the reliability of a system are improved, the fixed shell is made of an insulating resin material represented by an epoxy resin material, the density is low, the specific strength and the specific modulus are high, the weight of a component is reduced, early damage caused by resonance is avoided, mechanical impact with a certain equivalent weight is buffered in the actual detection process, the coil is protected, and the service life of the coil is prolonged. The electromagnetic ultrasonic thickness measuring transducer is placed inside a pipeline during actual detection of the electromagnetic ultrasonic thickness measuring transducer in the circular pipeline consisting of the handle, the fixed cylinder, the coil and the magnet, and the technical problems of thickness measurement detection in the normal running state of the circular pipeline in service and thickness measurement detection under the condition that the port of the circular pipeline can be opened are solved.
Example 1
The transducer structure adopts the design of receiving and dispatching integral type thickness measuring coil adoption sub-thread circumference wound form wiring, and thickness 0.05mm, wide 1 mm's wire (use a height 65mm datum line as the axle), twines into a hollow cylinder structure, and the wire stretches into the end and is located the cylinder side, and length equals in the cylinder height, and coil diameter 50mm, adjacent wire interval 2 mm.
The transducer structure adopting the coil goes deep into the inner side of the pipeline, and the thickness of the pipeline can be detected.
Example 2
The transducer structure adopts receiving and dispatching disconnect-type thickness measuring coil to adopt the design of bifilar circumference wound form wiring, two strands of thickness 0.05mm, 1mm wide wire is parallel nested, (use a height 65mm datum line as the axle), twine into a hollow cylinder structure, two strands of wires stretch into the end and are parallel to each other and apart from 1.5mm, all be located the cylinder side, length equals with the cylinder height, the adjacent wire interval of single strand 2mm, adjacent wire interval 0.5mm (adjacent wire interval 0.5 mm) between the bifilar, coil diameter 50 mm.
The transducer structure adopting the coil goes deep into the inner side of the pipeline, and the thickness of the pipeline can be detected.
The above description is made in detail for the purpose of describing the preferred embodiments of the present invention, and it is not intended to limit the present invention to the particular embodiments, and simple deductions and substitutions without departing from the spirit of the present invention should be considered as the protection scope of the present invention.
Claims (7)
1. The utility model provides a detect electromagnetism supersound thickness measurement transducer structure in circular pipeline, includes handle, coil, a protection section of thick bamboo and magnet, its characterized in that: the connecting steel ring is connected to one end of the handle, the magnet is a hollow cylindrical magnet formed by trisection combination in the circumferential direction, the magnet is fixed between the connecting steel ring and the fixing steel ring, the protecting cylinder is sleeved outside the magnet and is tightly attached to the magnet, an annular coil is arranged in the protecting cylinder, leads of the coil are wound and arranged in the same direction at equal intervals, an adjusting end which is integrated with the handle and has a diameter smaller than the outer diameter of the handle is extended out of the end part of the handle on the side of the connecting steel ring, external threads are arranged at the adjusting end, the adjusting end is in threaded connection with a fixing ring, a fixing groove is arranged on one side of the connecting steel ring, the position of the fixing groove corresponds to the ring; the end of the adjusting end protrudes out of a steel ring connecting end which is provided with an open cylindrical connecting cavity, the connecting steel ring is provided with a cylindrical connecting end, and the cylindrical connecting end is clamped in the cylindrical connecting cavity.
2. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 1, wherein: the protection cylinder comprises an inner protection cylinder and an outer protection cylinder, the inner protection cylinder is located on the inner side of the coil, and the outer protection cylinder is located on the outer side of the coil.
3. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 1, wherein: the handle is of a circular tubular structure, and an extension handle is connected with the inner thread of the handle.
4. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 3, wherein: the extension handle is of a cylindrical structure, one end of the extension handle is provided with an extension handle threaded connection end, the diameter of the extension handle threaded connection end is larger than other parts of the extension handle, and the extension handle threaded connection end is connected with the inner thread of the handle in a matched mode.
5. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 1, wherein: the wire cladding that the coil was drawn has a mounting, connects the steel ring and is equipped with a mounting recess, and the mounting is located the mounting recess, and mounting one end is equipped with the wire passageway other end and is equipped with the connector fixed slot, and the wire passageway communicates with the connector fixed slot, and the connector is installed to the connector fixed slot, and the wire that the coil was drawn passes the mounting and is connected fixedly together with the connector.
6. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 1, wherein: the connecting steel ring, the magnet, the protection cylinder, the coil and the fixing steel ring are fastened through screws or bolts.
7. The structure of the electromagnetic ultrasonic thickness measuring transducer for detecting in the circular pipeline according to claim 1, wherein: a single lead of the coil is a flat lead formed by arranging and fixing a plurality of thin leads.
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| CN111121678B (en) * | 2018-10-31 | 2021-06-01 | 中国石油天然气股份有限公司 | Pipeline wall thickness detection method and device |
| CN109765170B (en) * | 2019-01-15 | 2021-08-20 | 西南石油大学 | Hand-held type buried pipeline corrodes outer detection device |
| CN110514743A (en) * | 2019-09-03 | 2019-11-29 | 厦门大学 | A kind of electromagnetic supersonic flaw detecting method and device of pipeline defect detection |
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| JPH09196713A (en) * | 1996-01-16 | 1997-07-31 | Mitsubishi Heavy Ind Ltd | Jig for mounting/exchanging acoustic sensor |
| CN104122330B (en) * | 2014-07-22 | 2016-08-17 | 华中科技大学 | Defect inspection method and apparatus based on electromagnetic acoustic longitudinal wave guide |
| CN204129008U (en) * | 2014-08-28 | 2015-01-28 | 华中科技大学 | Magnetostrictive guided-wave sensor and the heat exchanger tube defect detecting system containing sensor |
| CN106441179A (en) * | 2016-11-30 | 2017-02-22 | 武汉优凯检测技术有限公司 | Electromagnetic ultrasonic transducer for measuring thickness of globular graphite cast tube |
| CN206696244U (en) * | 2017-05-05 | 2017-12-01 | 湖州市特种设备检测研究院 | A kind of electromagnetic ultrasonic probe for detecting defect of pipeline |
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