Electromagnetic ultrasonic and eddy current composite sensor and inspection method

Abstract

The present application relates to the technical field of pipe cleaning devices, and provides an electromagnetic ultrasonic and eddy current composite sensor and an inspection method. The electromagnetic ultrasonic and eddy current composite sensor comprises: a first electromagnetic ultrasonic magnet, a second electromagnetic ultrasonic magnet, an electromagnetic ultrasonic coil, an eddy current coil, and an inductance coil; the two electromagnetic ultrasonic coils are respectively connected to the bottoms of the first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet; the eddy current coil is located between the first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet; the inductance coil comprises a first inductance coil and a second inductance coil, and the first inductance coil is located between the first electromagnetic ultrasonic magnet and the eddy current coil; the first inductance coil is connected to the first electromagnetic ultrasonic magnet; the second inductance coil is located between the second electromagnetic ultrasonic magnet and the eddy current coil; the second inductance coil is connected to the second electromagnetic ultrasonic magnet; and the first inductance coil is connected to the second inductance coil. Thus, the problem that a sensor cannot detect inner and outer wall defects while detecting a change in wall thickness is solved.

Description

[0001] The present disclosure relates to the technical field of pipeline cleaning devices, and in particular to an electromagnetic ultrasonic - eddy current composite sensor and a detection method. BACKGROUND OF THE INVENTION

[0002] Pipeline operation requires a safe and smooth transportation. Therefore, it is necessary to regularly inspect the pipeline in order to find problems in time and take measures to reduce risks and prevent serious accidents such as leakage and explosion in the pipeline.

[0003] There are many methods to carry out inspection within pipeline, including magnetic flux leakage inspection, eddy current inspection, ultrasonic inspection, etc. Among them, magnetic flux leakage inspection is the most widely used and mature technology, but it has poor anti-interference ability and low spatial resolution; eddy current inspection can only detect surface defects due to its skin effect; ultrasonic inspection includes electromagnetic ultrasound inspection and piezoelectric ultrasound inspection, while piezoelectric ultrasound inspection requires a coupling medium. Although electromagnetic ultrasound inspection has favorable spatial detection ability, it has poor surface detection ability. Therefore, prior art sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects. SUMMARY OF THE INVENTION

[0004] The present disclosure provides an electromagnetic ultrasonic - eddy current composite sensor and a detection method to solve the problem that existing sensor cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0005] According to a first aspect of the present disclosure provides an electromagnetic ultrasonic - eddy current composite sensor, including: a first electromagnetic ultrasonic magnet, a second electromagnetic ultrasonic magnet, two electromagnetic ultrasonic coils, an eddy current coil and inductor coils; wherein the two electromagnetic ultrasonic coils are respectively coupled at a bottom of the first electromagnetic ultrasonic magnet and a bottom of the second electromagnetic ultrasonic magnet; wherein the eddy current coil is provided between the first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet; wherein the inductor coils comprise a first inductor coil and a second inductor coil, with the first inductor coil being located between the first electromagnetic ultrasonic magnet and the eddy current coil and being coupled to the first electromagnetic ultrasonic magnet, and the second inductor coil being located between the second electromagnetic ultrasonic magnet and the eddy current coil and being coupled to the second electromagnetic ultrasonic magnet; wherein the first inductor coil and the second inductor coil are electrically connected.

[0006] The first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet are used to place the object to be measured in a magnetic field with stable strength, minimize the influence caused by a change in magnetic permeability of the objected to be measured, and make the signal detected by the eddy current coil more stable. The eddy current coil is used to detect surface defects of the object to be measured. The electromagnetic ultrasonic coil is used to detect changes in the wall thickness of the object to be measured. The inductor coils are used to increase detection capability for large defects. The electromagnetic ultrasonic - eddy current composite sensor combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic - eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects. Meanwhile, the first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet are used to apply a stable magnetic field to the object to be measured, so that a more stable eddy current signal may be output.

[0007] Optionally, the electromagnetic ultrasonic coil includes one or more of a meander coil, a spiral coil, a racetrack coil, a butterfly coil, or a combination thereof.

[0008] The meander coil, spiral coil, racetrack coil, and butterfly coil all have a characteristic of reducing a volume and increasing a current per unit area.

[0009] Optionally, the inductor coil also includes a third inductor coil and a fourth inductor coil; the third inductor coil is arranged on a side of the first electromagnetic ultrasonic magnet away from the first inductor coil; the fourth inductor coil is arranged on a side of the second electromagnetic ultrasonic magnet away from the second inductor coil; the first inductor coil is electrically connected to the third inductor coil; the second inductor coil is electrically connected to the fourth inductor coil.

[0010] When the electromagnetic ultrasonic - eddy current composite sensor is lifted off, the third inductor coil and the fourth inductor coil are cooperated with the first inductor coil and the second inductor coil, so as to output in a differential way to reduce a lift-off effect of the electromagnetic ultrasonic - eddy current composite sensor.

[0011] Optionally, the electromagnetic ultrasonic coil and the eddy current coil are both integrated transceiver coils.

[0012] The integrated transceiver coil may be employed to reduce a signal blind area, and increase a signal strength comparatively.

[0013] Optionally, the electromagnetic ultrasonic - eddy current composite sensor further includes a shell; the first electromagnetic ultrasonic magnet, the second electromagnetic ultrasonic magnet, the electromagnetic ultrasonic coil, the eddy current coil and the inductance coils are all arranged inside the shell.

[0014] The shell is configured for reducing damages from external water, oil, dust, debris, etc. on internal components of the electromagnetic ultrasonic - eddy current composite sensor, thereby improving the service life.

[0015] Optionally, the first electromagnetic ultrasonic magnet has a cylindrical structure, with ends of the first electromagnetic ultrasonic magnet being connected with respective inductor coils; an upper surface of the first electromagnetic ultrasonic magnet forms an S pole; and a lower surface of the first electromagnetic ultrasonic magnet forms an N pole.

[0016] The first electromagnetic ultrasonic magnet is of a cylindrical structure, which not only facilitates a placement of the electromagnetic ultrasonic coil at a bottom surface of the first electromagnetic ultrasonic magnet, but also increases uniformity of the magnetic field thereof, making the magnetic field more uniform.

[0017] Optionally, the second electromagnetic ultrasonic magnet has a cylindrical structure, with ends of the second electromagnetic ultrasonic magnet being connected with respective inductor coils; an upper surface of the second electromagnetic ultrasonic magnet forms an S pole; and a lower surface of the second electromagnetic ultrasonic magnet forms an N pole.

[0018] The second electromagnetic ultrasonic magnet is of a cylindrical structure, which not only facilitates a placement of the electromagnetic ultrasonic coil at a bottom surface of the second electromagnetic ultrasonic magnet, but also increases uniformity of the magnetic field thereof, making the magnetic field more uniform.

[0019] According to a second aspect of the present disclosure, an electromagnetic ultrasonic -eddy current composite sensor detection method is applied to the electromagnetic ultrasonic -eddy current composite sensor described in the first aspect; the method comprises: placing the electromagnetic ultrasonic - eddy current composite sensor close to an inner surface of an object to be measured; driving the electromagnetic ultrasonic coil and the eddy current coil to generate an electromagnetic ultrasonic signal and an eddy current signal; obtaining an electromagnetic ultrasonic inductive signal, wherein the electromagnetic ultrasonic inductive signal is a signal induced by the electromagnetic ultrasonic coil after the electromagnetic ultrasonic signal interacts with the object to be measured; determining a thickness of the object to be measured according to the electromagnetic ultrasonic inductive signal; obtaining an eddy current inductive signal when the thickness of the object to be measured is less than a preset value, wherein the eddy current inductive signal is a signal induced by the eddy current coil after the eddy current signal interacts with the inner surface of the object to be measured; marking that a defective region is on an outer surface of the object to be measured if an amplitude of the eddy current inductive signal is the same as that of the eddy current signal; and marking that the defective region is on the inner surface of the object to be measured if the amplitude of the eddy current inductive signal is different from that of the eddy current signal.

[0020] The above method combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic -eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0021] Optionally, if the amplitude of the eddy current inductive signal is different from the amplitude of the eddy current signal, the method further includes: obtaining inductance signals induced by the inductor coils; marking that a large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is greater than a preset signal amplitude; and marking that no large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is less than or equal to the preset signal amplitude.

[0022] The above method is based on the fact that: when an inductor coil passes over a large defect, some of the magnetic flux lines will enter into air through the large defect, causing a magnetic flux in the inductor coil to change, which causes an induced electromotive force to change and consequently a signal with an amplitude greater than a preset signal amplitude to be output. By this, an existence of a large defect may be detected, and a detection of a large defect may be realized.

[0023] It can be seen from the above technical scheme that an embodiment of the present disclosure provides an electromagnetic ultrasonic - eddy current composite sensor and a detection method, wherein the electromagnetic ultrasonic - eddy current composite sensor includes: a first electromagnetic ultrasonic magnet, a second electromagnetic ultrasonic magne, electromagnetic ultrasonic coils, an eddy current coil and inductor coils. The two electromagnetic ultrasonic coils are respectively coupled to a bottom of the first electromagnetic ultrasonic magnet and a bottom of the second electromagnetic ultrasonic magnet; the eddy current coil is arranged between the first electromagnetic ultrasonic magnet and the second electromagnetic ultrasonic magnet; the inductance coils includes a first inductance coil and a second inductance coil, with the first inductance coil being located between the first electromagnetic ultrasonic magnet and the eddy current coil and being coupled to the first electromagnetic ultrasonic magnet, and the second inductance coil being located between the second electromagnetic ultrasonic magnet and the eddy current coil and being coupled to the second electromagnetic ultrasonic magnet; the first inductance coil is electrically connected to the second inductance coil. The electromagnetic ultrasonic - eddy current composite sensor combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic - eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for a person ordinarily skilled in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG 1 is a schematic structural diagram of an electromagnetic ultrasonic - eddy current composite sensor according to an embodiment of the present disclosure;

[0026] FIG. 2 is a schematic flow chart illustrating an electromagnetic ultrasonic - eddy current composite sensor detection method according to an embodiment of the present disclosure. Reference numerals: 1-first electromagnetic ultrasonic magnet; 2-second electromagnetic ultrasonic magnet; 3-electromagnetic ultrasonic coil; 4-eddy current coil; 5-first inductor coil; 6-second inductor coil; 7-third inductor coil; 8-fourth inductor coil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Pipeline operation requires a safe and smooth transportation. Therefore, it is necessary to regularly inspect the pipeline. There are many methods to carry out inspection within pipeline, including magnetic flux leakage inspection, eddy current inspection, ultrasonic inspection, etc. Among them, magnetic flux leakage inspection has poor anti-interference ability and low spatial resolution; eddy current inspection can only detect surface defects due to its skin effect; ultrasonic inspection includes electromagnetic ultrasound inspection and piezoelectric ultrasound inspection, while piezoelectric ultrasound inspection requires a coupling medium. Although electromagnetic ultrasound inspection has favorable spatial detection ability, it has poor surface detection ability. Therefore, prior art sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0028] To solve the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects, FIG. 1 illustrates a schematic structural diagram of an electromagnetic ultrasonic - eddy current composite sensor according to an embodiment of the present disclosure, and FIG. 2 shows a schematic flow chart illustrating an electromagnetic ultrasonic - eddy current composite sensor detection method according to an embodiment of the present disclosure.

[0029] According to an embodiment of the present disclosure, an electromagnetic ultrasonic -eddy current composite sensor includes: a first electromagnetic ultrasonic magnet 1, a second electromagnetic ultrasonic magnet 2, electromagnetic ultrasonic coils 3, an eddy current coil 4 and inductor coils.

[0030] The two electromagnetic ultrasonic coils 3 are respectively coupled to a bottom of the first electromagnetic ultrasonic magnet 1 and a bottom of the second electromagnetic ultrasonic magnet 2; the eddy current coil 4 is arranged between the first electromagnetic ultrasonic magnet 1 and the second electromagnetic ultrasonic magnet 2; the inductance coils includes a first inductance coil 5 and a second inductance coil 6, with the first inductance coil 5 being located between the first electromagnetic ultrasonic magnet I and the eddy current coil 4; and being coupled to the first electromagnetic ultrasonic magnet 1, and the second inductance coil 6 being located between the second electromagnetic ultrasonic magnet 2 and the eddy current coil 4 and being coupled to the second electromagnetic ultrasonic magnet 2; the first inductance coil 5 is electrically connected to the second inductance coil 6.

[0031] As shown in Figure 1, the first electromagnetic ultrasonic magnet 1 and the second electromagnetic ultrasonic magnet 2 are two magnets that oppositely arranged, such that pole orientation of the first electromagnetic ultrasonic magnet 1 and pole orientation of the second electromagnetic ultrasonic magnet 2 are in opposite directions. The object to be measured is magnetized by the first electromagnetic ultrasonic magnet 1 and the second electromagnetic ultrasonic magnet 2 to a saturated or near-saturated state, such that a magnetic field strength of the object to be measured remains stable. By this, an influence of changes in a magnetic permeability of the object to be measured may be reduced, and the signal detected by the eddy current coil 4 may be more stable. The eddy current coil 4 is used to detect surface defects of the object to be measured. The electromagnetic ultrasonic coil 3 is used to detect changes in wall thickness of the object to be measured. The inductor coils are used to increase a detection capability of large defects.

[0032] It should be understood that the electromagnetic ultrasonic coil 3 and the eddy current coil 4 are both provided with leads, which are used to connect to external connectors for excitation signals. The electromagnetic ultrasonic coil 3 and the eddy current coil 4 can be excited at the same time, so that the electromagnetic ultrasonic - eddy current composite sensor may achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0033] The electromagnetic ultrasonic - eddy current composite sensor combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic - eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects. At the same time, the first electromagnetic ultrasonic magnet 1 and the second electromagnetic ultrasonic magnet 2 are used to apply a stable magnetic field to the object to be measured, so that a more stable eddy current signal output is achieved.

[0034] According to some embodiments, the electromagnetic ultrasonic coil 3 includes one or more of a meander coil, a spiral coil, a racetrack coil, a butterfly coil, or a combination thereof.

[0035] The meander coil, spiral coil, racetrack coil, and butterfly coil all have a characteristic of reducing a volume and increasing a current per unit area.

[0036] According to some embodiments, the inductor coils further include a third inductor coil 7 and a fourth inductor coil 8; the third inductor coil 7 is arranged on a side of the first electromagnetic ultrasonic magnet 1 away from the first inductor coil 5; the fourth inductor coil 8 is arranged on a side of the second electromagnetic ultrasonic magnet 2 away from the second inductor coil 6; the first inductor coil 5 is electrically connected to the third inductor coil 7; the second inductor coil 6 is electrically connected to the fourth inductor coil 8.

[0037] It should be understood that the first inductor 5, the second inductor coil 6, the third inductor coil 7 and the fourth inductor coil 8 all include a positive terminal and a negative terminal. The way of electrical connection is that the positive terminals of the inductor coils are electrically connected to each other, and the negative terminals of the inductor coils are electrically connected to each other.

[0038] When the electromagnetic ultrasonic - eddy current composite sensor is lifted off, the third inductor coil 7 and the fourth inductor coil 8 are cooperated with the first inductor coil 5 and the second inductor coil 6, output in a differential way to reduce a lift-off effect of the electromagnetic ultrasonic - eddy current composite sensor.

[0039] According to some embodiments, the electromagnetic ultrasonic coil 3 and the eddy current coil 4 are both integrated transceiver coils.

[0040] It should be understood that the electromagnetic ultrasonic coil 3 includes an electromagnetic ultrasonic transmitting coil and an electromagnetic ultrasonic receiving coil. A number of the electromagnetic ultrasonic transmitting coil, as well as a number of the electromagnetic ultrasonic receiving coil, is greater than 1. The eddy current coil 4 includes an eddy current transmitting coil and an eddy current receiving coil, with a number of the eddy current transmitting coil and a number of the eddy current receiving coil being greater than 1. An integrated transceiver coil may be employed to reduce a signal blind area, and increase a signal strength comparatively.

[0041] According to some embodiments, the electromagnetic ultrasonic - eddy current composite sensor also includes a shell; the first electromagnetic ultrasonic magnet 1, the second electromagnetic ultrasonic magnet 2, the electromagnetic ultrasonic coil 3, the eddy current coil 4 and the inductor coils are all arranged inside the shell.

[0042] The shell is configured for reducing damages from external water, oil, dust, debris, etc. to internal components of the electromagnetic ultrasonic - eddy current composite sensor, thereby improving the service life. According to some embodiments, the shell is made of metal material, which has an impact-proof and interference-proof function, thereby minimizing external electromagnetic interference on the measurement result during a detection process.

[0043] According to some embodiments, interfaces are provided on the shell for electrically connection with the electromagnetic ultrasonic coil 3 and the eddy current coil 4.

[0044] According to some embodiments, the first electromagnetic ultrasonic magnet 1 has a cylindrical structure, with ends of the first electromagnetic ultrasonic magnet 1 being connected with respective inductor coils; an upper surface of the first electromagnetic ultrasonic magnet 1 forms an N pole; and a lower surface of the first electromagnetic ultrasonic magnet 1 forms an S pole.

[0045] The first electromagnetic ultrasonic magnet 1 is of a cylindrical structure, which not only facilitates a placement of the electromagnetic ultrasonic coil 3 at a bottom surface of the first electromagnetic ultrasonic magnet 1, but also increases uniformity of the magnetic field thereof, making the magnetic field more uniform.

[0046] According to some embodiments, the second electromagnetic ultrasonic magnet 2 has a cylindrical structure, with ends of the second electromagnetic ultrasonic magnet 2 being connected with respective inductor coils; an upper surface of the second electromagnetic ultrasonic magnet 2 forms an S pole; and a lower surface of the second electromagnetic ultrasonic magnet 2 forms an N pole.

[0047] The second electromagnetic ultrasonic magnet 2 is of a cylindrical structure, which not only facilitates a placement of the electromagnetic ultrasonic coil 3 at a bottom surface of the second electromagnetic ultrasonic magnet 2, but also increases uniformity of the magnetic field thereof, making the magnetic field more uniform.

[0048] In some other embodiments, the upper surface of the first electromagnetic ultrasonic magnet 1 forms an S pole, and the lower surface of the first electromagnetic ultrasonic magnet 1 forms an N pole; correspondingly, the upper surface of the second electromagnetic ultrasonic magnet 2 forms an N pole, and the lower surface of the second electromagnetic ultrasonic magnet 2 forms an S pole.

[0049] According to some embodiments of the present disclosure, an electromagnetic ultrasonic - eddy current composite sensor detection method is applied to the electromagnetic ultrasonic - eddy current composite sensor described in the above embodiment, as shown in FIG2; the method includes: SI00: placing the electromagnetic ultrasonic - eddy current composite sensor close to the inner surface of the object to be measured; S200: driving the electromagnetic ultrasonic coil 3 and the eddy current coil 4 to generate an electromagnetic ultrasonic signal and an eddy current signal; S300: obtaining an electromagnetic ultrasonic inductive signal, wherein the electromagnetic ultrasonic inductive signal is a signal induced by the electromagnetic ultrasonic coil 3 after the electromagnetic ultrasonic signal interacts with the object to be measured; S400: determining a thickness of the object to be measured according to the electromagnetic ultrasonic inductive signal; S500: obtaining an eddy current inductive signal when the thickness of the object to be measured is less than a preset value, wherein the eddy current inductive signal is a signal induced by the eddy current coil 4 after the eddy current signal interacts with the inner surface of the object to be measured; S510: marking that a defective region is on the outer surface of the object to be measured if an amplitude of the eddy current inductive signal is the same as that of the eddy current signal; S520: marking that the defective region is on the inner surface of the object to be measured if the amplitude of the eddy current inductive signal is different from that of the eddy current signal.

[0050] The above method combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic -eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0051] It should be understood that the object to be measured can be a pipeline, and pipe wall of the pipeline can be used as a part of the magnetic path, forming a magnetic path with the electromagnetic ultrasonic magnet and getting saturated magnetized. After being magnetized, a relative magnetic permeability of the pipe wall may be reduced to below 100, so as to minimize a change in magnetic permeability caused by the pipeline material itself. A current is supplied to the electromagnetic ultrasonic coil 3 to excite / produce ultrasound near the surfaces of the pipe wall, so as to measure the thickness of the pipe wall. The electromagnetic ultrasonic - eddy current composite sensor can be mounted onto a carrier and placed into a pipeline. The equipment may be pushed forward via a front-back pressure difference to perform a pipeline detection. When the eddy current coil 4 passes over an inner wall defect, the eddy current inductive signal will change. When the eddy current coil 4 passes over an outer wall defect or does not pass across a defect, the eddy current inductive signal will not not change. Combined with the electromagnetic ultrasonic coil 3, a detection of thinning of the inner and outer walls and large defects may be achieved.

[0052] According to some embodiments, as shown in FIG. 2, if the amplitude of the eddy current inductive signal is different from the amplitude of the eddy current signal, the method may further include: S521: obtaining inductance signals induced by the inductor coils; S522: marking that a large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is greater than a preset signal amplitude; and S523: marking that no large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is less than or equal to the preset signal amplitude.

[0053] It should be understood that the large defect may include a through hole. The above method is based on the fact that: when an inductor coil passes over a large defect, some of the magnetic flux lines will enter into air through the large defect, causing a magnetic flux in the inductor coil to change, which causes an induced electromotive force to change and consequently a signal with an amplitude greater than a preset signal amplitude to be output. By this, an existence of a large defect may be detected, and a detection of a large defect may be realized.

[0054] It can be seen from the above technical scheme that an embodiment of the present disclosure provides an electromagnetic ultrasonic - eddy current composite sensor and a detection method, wherein the electromagnetic ultrasonic - eddy current composite sensor includes: a first electromagnetic ultrasonic magnet 1, a second electromagnetic ultrasonic magnet 2, electromagnetic ultrasonic coils 3, an eddy current coil 4 and inductor coils. The two electromagnetic ultrasonic coils 3 are respectively coupled to a bottom of the first electromagnetic ultrasonic magnet 1 and a bottom of the second electromagnetic ultrasonic magnet 2; the eddy current coil 4 is arranged between the first electromagnetic ultrasonic magnet 1 and the second electromagnetic ultrasonic magnet 2; the inductance coils includes a first inductance coil 5 and a second inductance coil 6, with the first inductance coil 5 being located between the first electromagnetic ultrasonic magnet 1 and the eddy current coil 4 and being coupled to the first electromagnetic ultrasonic magnet 1, and the second inductance coil 6 being located between the second electromagnetic ultrasonic magnet 2 and the eddy current coil 4 and being coupled to the second electromagnetic ultrasonic magnet 2; the first inductance coil 5 is electrically connected to the second inductance coil 6. The electromagnetic ultrasonic -eddy current composite sensor combines electromagnetic ultrasonic detection and eddy current detection together, so as to improve an detection capability of the electromagnetic ultrasonic -eddy current composite sensor, which may be used to detect a change in wall thickness of the object to be measured and at the same time detect a location where the wall thickness change occurs, thereby realizing a distinguish between inner and outer wall defects and solving the problem that existing sensors cannot achieve a detection of changes in wall thickness together with a detection of inner and outer wall defects.

[0055] Similar parts between the embodiments provided in this disclosure can be referenced to each other. The specific implementation methods provided above are merely some examples under the general concept of this invention and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods developed based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. An electromagnetic ultrasonic - eddy current composite sensor, comprising:a first electromagnetic ultrasonic magnet (1), a second electromagnetic ultrasonic magnet (2), two electromagnetic ultrasonic coils (3), an eddy current coil (4) and inductor coils;wherein the two electromagnetic ultrasonic coils (3) are respectively coupled at a bottom of the first electromagnetic ultrasonic magnet (1) and a bottom of the second electromagnetic ultrasonic magnet (2);wherein the first electromagnetic ultrasonic magnet (1) and the second electromagnetic ultrasonic magnet (2) are two magnets that are oppositely arranged such that pole orientations thereof are in opposite directions;wherein the eddy current coil (4) is provided between the first electromagnetic ultrasonic magnet (1) and the second electromagnetic ultrasonic magnet (2);wherein the inductor coils comprise a first inductor coil (5) and a second inductor coil (6), with the first inductor coil (5) being located between the first electromagnetic ultrasonic magnet (1) and the eddy current coil (4) and being coupled to the first electromagnetic ultrasonic magnet (1), and the second inductor coil (6) being located between the second electromagnetic ultrasonic magnet (2) and the eddy current coil (4) and being coupled to the second electromagnetic ultrasonic magnet (2);wherein the first inductor coil (5) and the second inductor coil (6) are electrically connected.

2. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1, wherein the electromagnetic ultrasonic coil (3) comprises one or more of a meander coil, a spiral coil, a racetrack coil, a butterfly coil, or a combination thereof.

3. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1, wherein the inductor coils further comprises a third inductor coil (7) and a fourth inductor coil(8);wherein the third inductor coil (7) is arranged on a side of the first electromagnetic ultrasonic magnet (1) away from the first inductor coil (5), and the fourth inductor coil (8) is arranged on a side of the second electromagnetic ultrasonic magnet (2) away from the second inductor coil (6);wherein the first inductor coil (5) is electrically connected to the third inductor coil (7), and the second inductor coil (6) is electrically connected to the fourth inductor coil (8).

4. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1, wherein the electromagnetic ultrasonic coil (3) and the eddy current coil (4) are both integrated transceiver coils.

5. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1, further comprising a shell, with the first electromagnetic ultrasonic magnet (1), the second electromagnetic ultrasonic magnet (2), the electromagnetic ultrasonic coil (3), the eddy current coil (4) and the inductor coils being all arranged inside the shell.

6. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1,wherein the first electromagnetic ultrasonic magnet (1) has a cylindrical structure, with ends of the first electromagnetic ultrasonic magnet (1) being connected with respective inductor coils;wherein an upper surface of the first electromagnetic ultrasonic magnet (1) forms an N pole, and a lower surface of the first electromagnetic ultrasonic magnet (1) forms an S pole.

7. The electromagnetic ultrasonic - eddy current composite sensor according to claim 1,wherein the second electromagnetic ultrasonic magnet (2) has a cylindrical structure, with ends of the second electromagnetic ultrasonic magnet (2) being connected to respective inductor coils;wherein an upper surface of the second electromagnetic ultrasonic magnet (2) forms an S pole, and a lower surface of the second electromagnetic ultrasonic magnet (2) forms an N pole.

8. An electromagnetic ultrasonic - eddy current composite sensor detection method applied to the electromagnetic ultrasonic - eddy current composite sensor according to any one of claims 1 to 7, comprising:placing the electromagnetic ultrasonic - eddy current composite sensor close to an inner surface of an object to be measured;driving the electromagnetic ultrasonic coil (3) and the eddy current coil (4) to generate an electromagnetic ultrasonic signal and an eddy current signal;obtaining an electromagnetic ultrasonic inductive signal, wherein the electromagnetic ultrasonic inductive signal is a signal induced by the electromagnetic ultrasonic coil (3) after the electromagnetic ultrasonic signal interacts with the object to be measured;determining a thickness of the object to be measured according to the electromagnetic ultrasonic inductive signal;obtaining an eddy current inductive signal when the thickness of the object to be measured is less than a preset value, wherein the eddy current inductive signal is a signal induced by the eddy current coil (4) after the eddy current signal interacts with the inner surface of the object to be measured; andmarking that a defective region is on an outer surface of the object to be measured if an amplitude of the eddy current inductive signal is the same as that of the eddy current signal; and marking that the defective region is on the inner surface of the object to be measured if the amplitude of the eddy current inductive signal is different from that of the eddy current signal.

9. The electromagnetic ultrasonic - eddy current composite sensor detection method according to claim 8, wherein if the amplitude of the eddy current inductive signal is different from that of the eddy current signal, the method further comprising:obtaining inductance signals induced by the inductor coils;marking that a large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is greater than a preset signal amplitude; andmarking that no large defect exists on the inner surface of the object to be measured if an amplitude of the inductance signal is less than or equal to the preset signal amplitude.PATENT COOPERATION TREATYPCTINTERNATIONAL SERACH REPORT(PCT Article 18 and Rules 43 and 44)Applicant’s or agent’s file reference PCT2323052N FOR FURTHER ACTION See Form PCT / ISA / 220 as well as, where applicable, item 5 below International application No. PCT / CN2024 / 125253 International filing date (day / month / year) 16 October 2024 (Earliest) Priority Date (day / month / year) 23 October 2023 ApplicantSHENYANG ACADEMY OF INSTRUMENTATION SCIENCE CO., LTD.This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.This international report consists of a total of 3 sheets.CH It is also accompanied by a copy of each prior art document cited in this report.

1. Basis of reporta. With regard to the language, the international search was carried out on the basis of:S the international application in the language in which it was filed□ a translation of the international application into, which is the language of a translation furnished for the purposes of international search (Rule 12.3 (a) and 23.1 (b))b. □ This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6 bis (a)).c. O With regard to any nucleotide and / or amino acid sequence disclosed in the international application, see Box No. 1.

2. □ Certain claims were found unsearchable (see Box No.II)3. □ Unity of invention is lacking (see Box No. Ill)4. With regard to the title,the text is approved as submitted by the applicantQ the text has been determined by this Authority to read as follows:

5. With regard to the abstract,the text is approved as submitted by the applicant□ the text has been established, according to Rule 38.2(b), by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority6. With regard to the drawings,a. the figure of the drawings to be published with the abstract is Figure No. 1 as suggested by the applicant□ as selected by this Authority, because the applicant failed to suggest a figure□ as selected by this Authority, because this figure better characterizes the inventionb. □ none of the figures is to be published with the abstractInternational application No.PCT / CN2024 / 125253A. CLASSIFICATION OF SUBJECT MATTER GO 1 N29 / 04(2006.01 )i; GO 1 N29 / 34(2006.01 )i According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system and classification numbers should be stated) IPC: GOIN, G01B Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) CNTXT, CNK1, ENTXTC: SHENYANG ACADEMY OF INSTRUMENTATION SCIENCE CO., LTD., electromagnetic ultrasonic, eddy current, inductance, coil, thickness, defect, magnet, magnet, magnet pole, electromagnetic, ultrasonic, vortex, coil, magnet, inductance C. DOCUMETNS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. PX CN 117110437 A (SHENYANG ACADEMY OF INSTRUMENTATION SCIENCE CO., LTD.) November 24, 2023 (2023-11-24) Claims 1-9 1-9 A CN 108226277 A (Harbin Institute of Technology) June 29, 2018 (2018-06-29) Specification paragraphs [0009]-[0029], Attachment 1 1-9 A CN 109444270 A (Sichuan Mudisheng Technology Co., Ltd.) March 8. 2019 (2019-03-08) full text 1-9 A CN 101354380 A (Beijing University of Aeronautics and Astronautics) January 28, 2009 (2009-01-28) full text 1-9 A JP 2009145056 A (MITSUBISHI ELECTRIC CORP.) July 2. 2009 (2009-07-02) full text 1-9 Q Further documents are listed in the continuation of Box C. See patent family annexInternational application No.PCT / CN2024 / 125253* Special categories of cited documents: “I” later document published after the international „, , , . , , „ , filing date or priority date and not in conflict with the A document defining the general state of the art ., , , _ ., , , application but cited to understand the principle or which is not considered to be of particular relevance . , , , ,. , , theory underlying the invention D document cited by the applicant m the international application “E” earlier application or patent but published on or “X” document of particular relevance; the claimed after the international filing date invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone “L” document which may throw doubts on priority “Y” document of particular relevance; the claimed claim (s) or which is cited to establish the publication invention cannot be considered novel or cannot be date of another citation or other special reason (as considered to involve an inventive step when the specified) document is combined with one or more other such “0” document referring to an oral disclosure, use, documents, such combination being obvious to a exhibition or other means person skilled in the art “P” document published prior to the international filing document member of the same patent family date but later than the priority date claimed Date of the actual completion of the international search 12 December 2024 Date of mailing the international search report 3 January 2025 Name and mailing address of the ISA / CN State Intellectual Property Office of People’s Republic of China No. 6, Xitucheng Lu, Jimenqiao Haidian District, Beijing City, 100088 Authorized officer: WEI Wei Tel. No.: 86-10-53962392INTERNATIONAL SERACH REPORTInformation on patent family membersInternational application No.PCT / CN2024 / 125253Patent document cited in search report Publication date Patent family member (s) Publication date CN 117110437 A 24 November 2023 no CN 108226277 A 29 June 2018 no CN 109444270 A 8 March 2019 no CN 101354380 A 28 January 2009 no JP 2009145056 A 2 July 2009 no

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