CN102818774B - Laser-electromagnetic ultrasonic nondestructive testing system - Google Patents
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Abstract
A laser-electromagnetic ultrasonic nondestructive testing system belongs to the field of nondestructive testing and evaluation of metal materials. The nondestructive testing system first uses a pulsed laser system to emit a laser pulse, which is transported to the surface of a metal material through a line focusing optical lens; a thermal expansion principle or ablation principle of the metal material surface caused by laser is utilized to motivate ultrasonic; and then a designed electromagnetic ultrasonic sensor can receive ultrasonic signal in a lift-off distance of no more than 10 mm (lift-off distance refers to the distance between the electromagnetic ultrasonic sensor and the material to be detected). The system overcomes a problem that an existing laser ultrasonic detection technology is difficult to be used for the detection of material with rough surface, so as to get rid of the limit that the lift-off distance of the electromagnetic ultrasonic sensor must be less than 2mm. The system uses simple equipment, is convenient for operation and easy for practicability, and has high measurement accuracy and good repeatability. Therefore, the system provided by the invention is beneficial to further promotion and application of laser-electromagnetic ultrasonic detection technology, and has great economic and social benefits.
Description
Technical field
The present invention relates to a kind of laser-electromagnetic acoustic nondestructive detection system, belong to metal material NDT and NDE field.
Background technology
Up to now, there is not yet to be laser-electromagnetic acoustic detection system that 10 mm carry out Non-Destructive Testing lifting from distance.Piezoelectric supersonic technology for detection of the supercritical ultrasonics technology overwhelming majority of metal material defect based on contact, make this technology under rugged surroundings, have many difficulties when examinations, as high temperature, low temperature, radiation, corrosion environment and surface exist larger roughness etc.Existing non-contact laser ultrasonic technology adopts that laser pumping is ultrasonic, laser interferometer receives hyperacoustic mode and carries out Non-Destructive Testing more, the method is limited by reaction time and the sensitivity of interferometer receiving light power, and the smooth finish of sample surfaces is had relatively high expectations, along with degenerating of surface smoothness, receiving sensitivity declines rapidly, makes this technology in practical engineering application, have certain problem.American scholar Johanna the article pointed out the laser pumping ultrasonic surface wave that utilizes pulsed laser output at " Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals ", then receive the method for ultrasonic surface wave with electromagnetic ultrasonic transducer and can detect in high sensitivity the metal material with rough surface, but distance between electromagnetic ultrasonic transducer and the surface of tested material can not exceed 1 mm.This restriction of lifting from distance can cause, in the time that detection has larger surperficial extra coarse degree or degree of tilt material, undetected phenomenon easily occurring.In addition, when British scholar Dixon also points out that in " Detection of cracks in metal sheets using pulsed laser generated ultrasound and EMAT detection " literary composition electromagnetic ultrasonic transducer receives ultrasonic signal, its amplitude that receives signal is along with the increase of lifting from distance sharply reduces, and therefore he is almost close to electromagnetic ultrasonic transducer tested material surface in the time of experiment.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the invention provides a kind of laser-electromagnetic acoustic nondestructive detection system, high electromagnetic ultrasonic transducer and the corresponding signal filtering amplification system of lifting from distance is provided.The height providing is lifted from the shear wave electromagnetic ultrasonic transducer of distance, adopt butterfly Design PCB magnetic test coil to eliminate the electromagnetic noise that wire loop was produced, utilize carbonyl iron dust plate to eliminate the stray capacitance forming between magnet and PCB magnetic test coil, reduce noise, adopt the permanent magnet structure of different-diameter multilayer simultaneously, make to strengthen perpendicular to the magnetic field intensity of PCB coil, to strengthen the amplitude of the ultrasonic signal that received, above-mentioned design can increase substantially the signal to noise ratio (S/N ratio) of detection, and can under the prerequisite that meets signal to noise ratio (S/N ratio), use the prime amplifier of high-amplification-factor, filter joint can ensure that electromagnetic ultrasonic transducer of the present invention can lift from the ultrasonic signal that receives laser pumping in distance range at 0～10 mm.
Technical scheme of the present invention is: a kind of laser-electromagnetic acoustic nondestructive detection system, is characterized in that it comprises: pulsed laser, and described pulsed laser is for adjusting Q formula YAG pulsed laser, pulsed laser Output of laser is to line style focusing unit, line style focusing unit, described line style focusing unit is made up of the stand for optical lens of cylindrical lens and adjustable focal length, the stand for optical lens of adjustable focal length is for the focal length place to line style condenser lens by the distance adjustment between line style focusing unit and detected metal material, described line style focusing unit distributes for pulse laser being carried out to energy centralization and being line style, and Linear Laser bundle is transferred to metal material surface, cause thermal expansion or the ablated surface of metal material surface, to motivate, directive property is good, the ultrasound wave of concentration of energy, electromagnetic acoustic receiving element, the ultrasonic shear waves signal that described electromagnetic acoustic receiving element can motivate 10～200 mJ/pulse pulse lasers within the scope of 0～10 mm in metal material or defect diffraction go out shear wave signal and receive and be converted into electric signal and export signal amplification filtering unit to, three-dimensional machinery step device, described three-dimensional machinery step device is made up of stepper motor and mechanical clamping device, and its mobile accuracy is 0.02 mm, described electromagnetic acoustic receiving element is clamped and fastened on three-dimensional machinery step device, signal amplification filtering unit, described signal amplification filtering unit comprises prime amplifier and two parts of analog filter, wherein ultrasonic signal enters prime amplifier after coil output after testing, its process is the LC frequency selection circuit that first signal passes through centre frequency 0.5 MHz, enter the first order amplifier of approximately 70 times of enlargement factors, after capacitive coupling, enter the second level amplifier that enlargement factor is about 4 times, by entering analog filter after impedance matching, wherein analog filter is that bivalent high-pass filter and enlargement factor are about 4 times, the signal of analog filter output enters variable gain amplifier, between gain region, 0～30dB is enlargement factor 0～31.6).And then frequency selection circuit after filtering, enter the operational amplifier that afterbody is about 4 times, amplify and export digital oscilloscope to; Electrically connect in addition digital oscilloscope and computing machine together.
The concrete feature of this programme also has, pulse width 8～15 ns of described tune Q formula YAG pulsed laser, and wavelength 1064 nm, energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
The ultrasonic frequency in metal material is filtering to 0.5～4 MHz by described signal amplification filtering unit, and signal total magnification is 0～141000 times.
Described electromagnetic acoustic receiving element comprises the front end end cover and the rear end cap that link together by attachment screw, is used to form convection heat transfer' heat-transfer by convection air-flow cavity, protection inner magnet and magnetic test coil; In front end end cover bottom, center through hole is set, in center through hole, be provided with wear resistant ceramic chip to improve the serviceable life of electromagnetic acoustic receiving element, stacking thermal insulation ceramics sheet above wear resistant ceramic chip to reduce the heat conduction between sensor outside and inside, prevent that internal temperature rise is too high; Sensor outer housing is set between front end end cover and rear end cap for fixed magnet group and protection internal components, described sensor outer housing top is provided with intermediate end cover, bottom is corresponding with the center through hole of front end end cover is provided with central mounting hole, carbonyl iron dust plate is set in central mounting hole, between carbonyl iron dust plate and thermal insulation ceramics sheet, is provided with PCB magnetic test coil; Between PCB magnetic test coil and prime amplifier, be electrically connected, be delivered to prime amplifier for the signal that PCB magnetic test coil is received and amplify processing;
In sensor outer housing inside, magnet fixed mount is set, for fixing prime amplifier and magnet, the 4th circular magnet is set in magnet fixed mount, above the 4th circular magnet, stack successively the 3rd circular magnet, the second circular magnet and the first circular magnet; The fixed mount being connected on sensor outer housing is set above the 4th circular magnet, for fixed magnet group.
The 4th circular magnet diameter < the 3rd circular magnet diameter < second circular magnet diameter < the first circular magnet diameter.
Between fixed mount and the 4th circular magnet, backing plate is set, for compressing magnet.
Fixed mount top arranges prime amplifier; Connector is set on intermediate end cover; Between prime amplifier and connector, be electrically connected, carry out filtering processing for the signal of prime amplifier output is delivered to filtering circuit.
Valve is set on rear end cap, when too high for detection of environment temperature, the input port of refrigerating gas.
What PCB magnetic test coil adopted is butterfly project organization.
Adopt the step of this system detection metal material defect as follows:
1. calibration pulse laser instrument and line style focusing unit position, make the two concentricity placement.Wherein: described pulsed laser is tune Q formula YAG pulsed laser, pulse width 8～15 ns, wavelength 1064 nm, energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
2. adjust the position of line style focusing unit central column face lens, so that detected metal material is positioned at cylindrical lens focal length place.
3. open laser pumping ultrasound unit working power, to motivate Gaussian-shaped pulse laser, utilize line style focusing unit that pulse laser is carried out to energy centralization and be line style and distribute, and Linear Laser bundle is transferred to metal material surface, cause thermal expansion or the ablation of metal material surface, to motivate, directive property is good, the ultrasound wave of concentration of energy.
4. open the working power of electromagnetic acoustic receiving element and three-dimensional machinery step device, adjust distance and horizontal level between electromagnetic acoustic receiving element and detected metal material, make the center of Linear Laser spot of electromagnetic acoustic receiving element and detected metal material surface on same level line.Wherein: shear wave that wave mode conversion produces occurs when ultrasound wave is run into defect described electromagnetic acoustic receiving element or the shear wave of defect diffraction changes into electric signal; Three-dimensional machinery step device is made up of stepper motor and mechanical clamping device, and its mobile accuracy is 0.02 mm.
5. the working power of start signal amplification filtering unit, digital oscilloscope and computing machine, set frequency filtering and the enlargement factor of amplification filtering unit, correcting digital oscillograph oscillograph are set to peak records state, and confirmation signal amplification filtering unit, digital oscilloscope and computing machine are in UNICOM's state.
6. adjust the position of electromagnetic acoustic receiving element, make it carry out scanning to detect defect along the residing horizontal line direction of line style laser spot and electromagnetic acoustic receiving element center.Observation oscilloscope, in the time that electromagnetic acoustic receiving element is directly over defect, the flaw indication amplitude maximum receiving; By the signal under this state be delivered to that computing machine records, preservation and post-processed.
The beneficial effect of this programme is: due to PCB magnetic test coil adopt be butterfly project organization, this structure can be removed the electromagnetic noise that wire loop produces; Adopt multi-gradient formula group of magnets project organization, can improve the magnetic field in PCB magnetic test coil region, make magnetic induction line as much as possible perpendicular to detected material surface, improve and receive hyperacoustic sensitivity, to improve the ultimate value of distance between sensor and detected material; Carbonyl iron dust sheet is the effect of playing insulation magnetic conduction, be equal to a reverse switch, magnetic field is passed through and the complete conductively-closed of electric field, so that PCB magnetic test coil only receives the electromotive force that in detected material, ultrasonic vibration causes, and farthest eliminated electrical noise in circuit.The project organization of this sensor, can at utmost reduce electrical noise, so that the prime amplifier using can improve enlargement factor as much as possible, and then has increased the distance of lifting from while detection.This laser-electromagnetic acoustic nondestructive detection system, without couplant, can go out ultrasound wave by long-distance activating, and not Stimulated Light incident angle, metal material geometric configuration and surface roughness affect, by designing high electromagnetic ultrasonic transducer and the signal filtering amplifying unit of lifting from distance, can make electromagnetic ultrasonic transducer is in 0～10 mm, to receive the shear wave of wave mode conversion and the shear wave of defect diffraction occur when ultrasound wave runs into defect lifting from distance range, can measure metal material defective locations and size.This detection system is specially adapted to high temperature, low temperature, radiation, corrosion environment and surface and has the Non-Destructive Testing under the rugged surroundings such as larger roughness, and this is that current conventional Ultrasound detection method and system are difficult to realize.This method device therefor is simple, easy to operate, is easy to practically, and measuring accuracy is high, and favorable repeatability contributes to the further promotion and application of laser-electromagnetic acoustic detection technique, has larger economic benefit and social benefit.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described.Fig. 1 is a kind of laser-electromagnetic acoustic nondestructive detection system schematic diagram.Fig. 2 is that aluminium sheet people industrial injury surface crack is made schematic diagram.Fig. 3 is the structural design drawing of electromagnetic acoustic unit.Fig. 4 is pre-amplification circuit schematic diagram in the signal amplification filtering unit of laser-electromagnetic acoustic lossless system.Fig. 5 is filtering circuit schematic diagram in the signal amplification filtering unit of laser-electromagnetic acoustic lossless system.Fig. 6 is a kind of laser-electromagnetic acoustic lossless detection method principle schematic of contactless metal material surface defect.Laser-electromagnetic acoustic Non-Destructive Testing result of Fig. 7 surface of aluminum plate crack defect that is native system in the time lifting from distance and be 0 mm.Fig. 8 is laser-electromagnetic acoustic Non-Destructive Testing result of lifting from distance aluminium surface crack defect while being 0 mm in document " Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals ".Laser-electromagnetic acoustic Non-Destructive Testing result of Fig. 9 surface of aluminum plate crack defect that is native system in the time lifting from distance and be 10 mm.
In figure: 1-wear resistant ceramic chip; 2-thermal insulation ceramics sheet; 3-PCB magnetic test coil (Printed Circuit Board, PCB, i.e. printed circuit board); 4-front end end cover; 5-sensor outer housing; 6-trip bolt; 7-intermediate end cover; 8-valve; 9-rear end cap; 10-attachment screw; 11-connector; 12-prime amplifier; 13-fixed mount; 14-backing plate; 15-the first circular magnet; 16-the second circular magnet; 17-the 3rd circular magnet; 18-the 4th circular magnet; 19-magnet fixed mount; 20-compressed air outlet; 21-carbonyl iron dust plate.
Embodiment
Principle and feature below in conjunction with accompanying drawing to patent of the present invention are described, and illustrated embodiment is aluminium sheet (trade mark 6016) testing result.
Fig. 1 is a kind of high laser-electromagnetic acoustic nondestructive detection system schematic diagram of lifting from distance.First will between pulsed laser, three-dimensional machinery step device, electromagnetic acoustic receiving element, signal amplification filtering unit, digital oscilloscope and computing machine, be electrically connected successively, and electromagnetic acoustic receiving element is fixed on to three-dimensional machinery step device.Calibration pulse laser instrument and line style focusing unit position, make the two concentricity placement.Adjust the position of line style focusing unit central column face lens so that aluminium sheet in and cylindrical lens between distance be 200 mm.
Fig. 2 has provided people's industrial injury surface crack in aluminium sheet and has made schematic diagram, aluminium sheet is of a size of 700 mm × 20, mm × 600 mm, the surface type people industrial injury of utilizing line cutting technology to go out No. 45 steel surface working, selects to be of a size of 60 mm × 0.5, mm × 0.5 mm surface cracks as detected object.Open laser pumping ultrasound unit (1) working power, setting pulse repetition rate is 10 Hz, pulse energy is 10 mJ/pluse, utilizing line style focusing unit will motivate Gaussian-shaped pulse laser carries out energy centralization and is line style distributing, and Linear Laser bundle is transferred to surface of aluminum plate, cause the thermal expansion of surface of aluminum plate, to motivate, directive property is good, the ultrasonic surface wave of concentration of energy, and the Linear Laser hot spot length obtaining in experiment is 11 mm.
Fig. 3 provides the structural design drawing of electromagnetic acoustic unit.Described electromagnetic acoustic receiving element comprises the front end end cover 4 and the rear end cap 9 that link together by attachment screw 10, in front end end cover 4 bottoms, center through hole is set, and is provided with wear resistant ceramic chip 1 in center through hole, stacks thermal insulation ceramics sheet 2 above wear resistant ceramic chip 1; Between front end end cover 4 and rear end cap 9, sensor outer housing 5 is set, described sensor outer housing 5 tops are provided with intermediate end cover 7, the center through hole of sensor outer housing 5 bottoms and front end end cover 4 is corresponding is provided with central mounting hole, carbonyl iron dust plate 21 is set in central mounting hole, between carbonyl iron dust plate 21 and thermal insulation ceramics sheet 2, is provided with PCB magnetic test coil 3; Between PCB magnetic test coil and prime amplifier, be electrically connected;
In sensor outer housing 5 inside, magnet fixed mount 19 is set, the 4th circular magnet 18 is set in magnet fixed mount 19, above the 4th circular magnet 18, stack successively the 3rd circular magnet 17, the second circular magnet 16 and the first circular magnet 15; The fixed mount 13 being connected on sensor outer housing 5 is set above the 4th circular magnet 18; The 4th circular magnet 18 diameter < the 3rd circular magnet 17 diameter < second circular magnet 16 diameter < the first circular magnet 15 diameters; Between fixed mount 13 and the 4th circular magnet 18, backing plate 14 is set; Fixed mount 13 tops arrange prime amplifier 12; Connector 11 is set on intermediate end cover 7; Between prime amplifier and connector, be electrically connected.
Valve 8 is set on rear end cap 9.What PCB magnetic test coil 3 adopted is butterfly project organization.
Open the working power of electromagnetic acoustic receiving element and three-dimensional machinery step device, adjust distance and horizontal level between electromagnetic acoustic receiving element and aluminium sheet, make the center of Linear Laser spot of electromagnetic acoustic receiving element and surface of aluminum plate on same level line.In embodiment, the distance between electromagnetic acoustic receiving element and aluminium sheet is chosen to be respectively to 0 mm and 10 mm, for comparative illustration.
Fig. 4 has provided the pre-amplification circuit schematic diagram in the signal amplification filtering unit of laser-electromagnetic acoustic nondestructive detection system, and Fig. 5 has provided the filtering circuit schematic diagram in the signal amplification filtering unit of laser-electromagnetic acoustic nondestructive detection system.The working power of start signal amplification filtering unit, digital oscilloscope and computing machine, the frequency filtering scope of selected amplification filtering unit is 1～2 MHz, lift from distance while being 0 mm enlargement factor elect 11000 enlargement factors when lifting from distance and being 10 mm as and elect 26000 as, correcting digital oscillograph is also set it in peak records state, and then confirmation signal amplification filtering unit, digital oscilloscope and computing machine are in UNICOM's state.
Fig. 6 has provided a kind of laser-electromagnetic acoustic lossless detection method principle schematic of contactless metal material surface defect.Utilize described electromagnetic acoustic receiving element, make it carry out scanning and observe digital oscilloscope along the residing horizontal line direction of line style laser spot and electromagnetic acoustic receiving element center, when scanning is during to defective locations, can receive the shear wave signal that wave mode conversion produces occurs when surface wave runs into surface imperfection, and convert it into electric signal transmission to signal amplification filtering unit, according to electromagnetic induction principle, distance one timing between electromagnetic acoustic receiving element and surface of aluminum plate, received signal amplitude maximum when electromagnetic acoustic receiving element is positioned at directly over defect, signal under this state is used for judging defective locations and size, and by computing machine, this signal is carried out to host computer demonstration, record, preserve and process.
It is that between 120 mm, electromagnetic ultrasonic transducer and aluminium sheet, distance is 0 mm condition lower surface defect detection signal that Fig. 7 has provided in this detection system distance between line style laser beam and electromagnetic acoustic receiving element, its peak-to-peak value amplitude is about 4.19 V, and signal to noise ratio (S/N ratio) is about 27.8 dB.
Fig. 8 has provided in document " Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals ", defect detection signal result when distance is 0 mm between electromagnetic ultrasonic transducer and aluminium sheet, peak-to-peak value is about 0.2 mV.Comparison diagram 6 can find, the flaw indication amplitude that native system receives is about 20000 times of document result.
It is that between 120 mm, electromagnetic ultrasonic transducer and aluminium sheet, distance is 10 mm condition lower surface defect detection signals that Fig. 9 has provided in this detection system distance between line style laser beam and electromagnetic acoustic receiving element, its peak-to-peak value amplitude is about 0.64 V, and signal to noise ratio (S/N ratio) is about 14.5 dB.
Claims (6)
1. laser-electromagnetic acoustic nondestructive detection system, is characterized in that it comprises: pulsed laser, and described pulsed laser is for adjusting Q formula YAG pulsed laser; Pulsed laser Output of laser is to line style focusing unit; Line style focusing unit, described line style focusing unit is made up of the stand for optical lens of cylindrical lens and adjustable focal length; The stand for optical lens of adjustable focal length is for the focal length place to line style condenser lens by the distance adjustment between line style focusing unit and detected metal material; Described line style focusing unit distributes for pulse laser being carried out to energy centralization and being line style, and Linear Laser bundle is transferred to metal material surface, causes the thermal expansion of metal material surface, and to motivate, directive property is good, the ultrasound wave of concentration of energy; Electromagnetic acoustic receiving element, the ultrasonic shear waves signal that described electromagnetic acoustic receiving element can motivate 10～200 mJ/pulse pulse lasers within the scope of 0～10 mm in metal material or diffraction shear wave signal receive and are converted into electric signal and export signal amplification filtering unit to; Three-dimensional machinery step device, described three-dimensional machinery step device is made up of stepper motor and mechanical clamping device, and its mobile accuracy is 0.02 mm; Described electromagnetic acoustic receiving element is clamped and fastened on three-dimensional machinery step device;
Signal amplification filtering unit, described signal amplification filtering unit comprises prime amplifier and two parts of analog filter; Signal amplification filtering unit will export digital oscilloscope to after the Electric signal processing of electromagnetic acoustic receiving element output; Electrically connect in addition digital oscilloscope and computing machine together;
Described electromagnetic acoustic receiving element comprises the front end end cover and the rear end cap that link together by attachment screw, in front end end cover bottom, center through hole is set, and is provided with wear resistant ceramic chip in center through hole, stacks thermal insulation ceramics sheet above wear resistant ceramic chip;
Between front end end cover and rear end cap, sensor outer housing is set, described sensor outer housing top is provided with intermediate end cover, bottom is corresponding with the center through hole of front end end cover is provided with central mounting hole, carbonyl iron dust plate is set in central mounting hole, between carbonyl iron dust plate and thermal insulation ceramics sheet, is provided with PCB magnetic test coil; Between PCB magnetic test coil and prime amplifier, be electrically connected, be delivered to prime amplifier for the signal that PCB magnetic test coil is received and amplify processing;
In sensor outer housing inside, magnet fixed mount is set, the 4th circular magnet is set in magnet fixed mount, above the 4th circular magnet, stack successively the 3rd circular magnet, the second circular magnet and the first circular magnet; The fixed mount being connected on sensor outer housing is set above the 4th circular magnet; The 4th circular magnet diameter < the 3rd circular magnet diameter < second circular magnet diameter < the first circular magnet diameter; What PCB magnetic test coil adopted is butterfly project organization.
2. laser-electromagnetic acoustic nondestructive detection system according to claim 1, is characterized in that pulse width 8～15 ns of described tune Q formula YAG pulsed laser, wavelength 1064 nm, and energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
3. laser-electromagnetic acoustic nondestructive detection system according to claim 1, is characterized in that the ultrasonic frequency in metal material is filtering to 0.5～4 MHz by described signal amplification filtering unit, and signal total magnification is 0～141000 times.
4. laser-electromagnetic acoustic nondestructive detection system according to claim 1, is characterized in that, between fixed mount and the 4th circular magnet, backing plate is set.
5. laser-electromagnetic acoustic nondestructive detection system according to claim 1, is characterized in that fixed mount top arranges prime amplifier; Connector is set on intermediate end cover; Between prime amplifier and connector, be electrically connected, carry out filtering processing for the signal of prime amplifier output is delivered to filtering circuit.
6. laser-electromagnetic acoustic nondestructive detection system according to claim 1, is characterized in that arranging valve on rear end cap.
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| CN106017371B (en) * | 2016-06-29 | 2018-07-06 | 浙江大学 | The measuring device and its method of surface defect opening width based on laser-ultrasound |
| CN107064296B (en) * | 2017-01-18 | 2024-04-05 | 中国特种设备检测研究院 | Multi-mode electromagnetic ultrasonic detection system and electromagnetic ultrasonic sensor |
| CN106994984B (en) * | 2017-05-23 | 2023-09-01 | 山东省科学院激光研究所 | Laser acousto-magnetic steel rail surface defect rapid flaw detection system and method |
| CN110045021A (en) * | 2019-05-27 | 2019-07-23 | 山东省科学院激光研究所 | Electromagnetic acoustic phased array detection system |
| CN110108795B (en) * | 2019-05-28 | 2020-08-04 | 北京交通大学 | Laser ultrasonic electromagnetic array detection device |
| CN111380961B (en) * | 2020-03-31 | 2023-04-28 | 南昌航空大学 | Electromagnetic ultrasonic probe for detecting ultra-high temperature cast and forged piece and online rapid detection method |
| CN113702495B (en) * | 2021-07-27 | 2023-05-05 | 宝宇(武汉)激光技术有限公司 | Laser electromagnetic two-in-one probe and nondestructive testing device comprising same |
| CN113633899B (en) * | 2021-08-04 | 2023-12-08 | 四川泰猷科技有限公司 | Continuous zooming low-intensity focusing ultrasonic transducer |
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