CN102818774A - Laser-electromagnetic ultrasonic nondestructive testing system - Google Patents
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- CN102818774A CN102818774A CN2012102903102A CN201210290310A CN102818774A CN 102818774 A CN102818774 A CN 102818774A CN 2012102903102 A CN2012102903102 A CN 2012102903102A CN 201210290310 A CN201210290310 A CN 201210290310A CN 102818774 A CN102818774 A CN 102818774A
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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 Non-Destructive Testing and evaluation field.
Background technology
Up to now, not seeing as yet to be laser-electromagnetic acoustic detection system that 10 mm carry out Non-Destructive Testing lifting from distance.Be used to detect the piezoelectric supersonic technology of the supercritical ultrasonics technology overwhelming majority of metal material defective based on contact; Make to have many difficulties when should technology under rugged surroundings, implementing to detect, like the bigger roughness of high temperature, low temperature, radiation, corrosion environment and surface existence 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; This method is limited by the reaction time and the sensitivity of interferometer receiving light power; And the smooth finish of sample surfaces had relatively high expectations; Along with degenerating of surface smoothness, receiving sensitivity descends rapidly, makes this technology in practical engineering application, have certain problem.American scholar Johanna points out to utilize the laser pumping ultrasonic surface wave of pulsed laser output in " Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals " literary composition; Method with electromagnetic ultrasonic transducer reception ultrasonic surface wave can detect the metal material with rough surface in high sensitivity then, yet the distance between the surface of electromagnetic ultrasonic transducer and seized material can not surpass 1 mm.This restriction of lifting from distance can cause having that big surface is slightly released souls from purgatory or during the degree of tilt material, the omission phenomenon taking place easily in detection.In addition; When Britain scholar Dixon points out also 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, so he almost is close to seized material surface with electromagnetic ultrasonic transducer when experiment.
Summary of the invention
In order to overcome the problem that exists in the above-mentioned prior art, the present invention provides a kind of laser-electromagnetic acoustic nondestructive detection system, and high electromagnetic ultrasonic transducer and the corresponding signal filtering amplification system of lifting from distance is provided.The height that is provided 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 the carbonyl iron dust plate to eliminate the stray capacitance that forms between magnet and the PCB magnetic test coil; Reduce noise, adopt the permanent magnet structure of different-diameter multilayer simultaneously, feasible magnetic field intensity perpendicular to the PCB coil strengthens; 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 satisfy under the prerequisite of signal to noise ratio (S/N ratio) the prime amplifier that uses high-amplification-factor, and filter joint can guarantee that electromagnetic ultrasonic transducer of the present invention can lift from the ultrasonic signal that receives laser pumping in the 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 transferring Q formula YAG pulsed laser; Pulsed laser output laser to line style focusing unit; The 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 used for the focal length place with distance adjustment to the line style condenser lens between line style focusing unit and the metal material to be detected; Described line style focusing unit is used for pulse laser is carried out energy centralization and be line style distributing; And the Linear Laser bundle transferred to metal material surface; Cause the thermal expansion or the ablated surface of metal material surface, directive property is good to motivate, the ultrasound wave of concentration of energy; Electromagnetic acoustic receiving element, described electromagnetic acoustic receiving element can motivate 10～200 mJ/pulse pulse lasers in 0～10 mm scope in metal material ultrasonic shear waves signal or defective diffraction go out the shear wave signal and receive and be converted into electric signal and export signal amplification filtering unit to; The 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 the 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 gets into prime amplifier after magnetic test coil output; Its process is the LC frequency selection circuit that signal at first passes through centre frequency 0.5 MHz, gets into the about 70 times first order amplifier of enlargement factor, is about 4 times second level amplifier through getting into enlargement factor after the capacitive coupling; After get into analog filter after the impedance matching; Wherein analog filter is that bivalent high-pass filter and enlargement factor are about 4 times, and the signal of analog filter output gets into variable gain amplifier, and 0～30dB is an enlargement factor 0～31.6 between gain region).And then through the filtering frequency selection circuit, the entering afterbody is about 4 times operational amplifier, amplifies to export digital oscilloscope to; Electrically connect together digital oscilloscope and computing machine in addition.
The concrete characteristics of this programme also have, pulse width 8～15 ns of said accent Q formula YAG pulsed laser, and wavelength 1064 nm, energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
Described signal amplification filtering unit is filtering to 0.5～4 MHz with the ultrasonic frequency in the metal material, and the signal total magnification is 0～141000 times.
Described electromagnetic acoustic receiving element comprises front end end cover and the rear end cap that links together through attachment screw, is used to form convection heat transfer' heat-transfer by convection air-flow cavity, protection inner magnet and magnetic test coil; In the front end end cover bottom center through hole is set; In center through hole, be provided with the wear-resistant ceramic sheet to improve the serviceable life of electromagnetic acoustic receiving element; Stacking the thermal insulation ceramics sheet above the wear-resistant ceramic sheet, prevent that internal temperature rise is too high to reduce the heat conduction between sensor outside and the inside; Sensor outer housing is set between front end end cover and rear end cap is used for fixing group of magnets and protection internal components; End cap in the middle of said sensor outer housing top is provided with; The bottom is corresponding with the center through hole of front end end cover to be provided with central mounting hole; The carbonyl iron dust plate is set in central mounting hole, between carbonyl iron dust plate and thermal insulation ceramics sheet, is provided with the PCB magnetic test coil; Be electrically connected between PCB magnetic test coil and the prime amplifier, signal conveys to the prime amplifier that is used for the PCB magnetic test coil is received carries out processing and amplifying;
At sensor outer housing set inside magnet fixed mount, be used for fixing prime amplifier and magnet, the 4th circular magnet is set in the magnet fixed mount, above the 4th circular magnet, stack the 3rd circular magnet successively, second circular magnet and first circular magnet; Above the 4th circular magnet, be provided with and be connected the fixed mount on the sensor outer housing, be used for fixing group of magnets.
The 4th circular magnet diameter＜the 3rd circular magnet diameter＜second circular magnet diameter＜first circular magnet diameter.
Between fixed mount and the 4th circular magnet, backing plate is set, is used to compress magnet.
The fixed mount top is provided with prime amplifier; Cover in intermediate ends connector is set; Be electrically connected between prime amplifier and the connector, be used for signal conveys to the filtering circuit of prime amplifier output is carried out Filtering Processing.
Valve is set on rear end cap, is used for the testing environment temperature when too high, the input port of refrigerating gas.
What the PCB magnetic test coil adopted is the butterfly project organization.
Adopt the step of this system's detection metal material defective following:
1. calibration pulse laser instrument and line style focusing unit position make the two concentricity placement.Wherein: described pulsed laser is accent Q formula YAG pulsed laser, pulse width 8～15 ns, and wavelength 1064 nm, energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
2. adjust the position of cylindrical lens in the line style focusing unit, so that metal material to be detected is positioned at cylindrical lens focal length place.
3. open laser pumping ultrasound unit working power; To motivate Gaussian-shaped pulse laser; Utilize the line style focusing unit that pulse laser is carried out energy centralization and be line style and distribute; And the Linear Laser bundle transferred to metal material surface, and causing the thermal expansion or the ablation of metal material surface, directive property is good to motivate, the ultrasound wave of concentration of energy.
4. open the working power of electromagnetic acoustic receiving element and three-dimensional machinery step device; Distance and horizontal level between adjustment electromagnetic acoustic receiving element and the metal material to be detected are on the same horizontal line center of the Linear Laser spot of electromagnetic acoustic receiving element and metal material surface to be detected.Wherein: the shear wave that the wave mode conversion produced or the shear wave of defective diffraction take place when described electromagnetic acoustic receiving element is used for that ultrasound wave run into defective change into electric signal; The 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 the frequency filtering and the enlargement factor of amplification filtering unit; Correcting digital oscillograph and oscillograph are set to the 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 the residing horizontal line direction of its type laser spot along the line and electromagnetic acoustic receiving element center carry out scanning to detect defective.Observation oscilloscope, in the time of directly over the electromagnetic acoustic receiving element is in defective, the flaw indication amplitude that receives is maximum; With the signal conveys under this state to computing machine write down, preservation and post-processed.
The beneficial effect of this programme is: because the employing of PCB magnetic test coil is the 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 zone; Make magnetic induction line as much as possible perpendicular to material surface to be detected, improve the hyperacoustic sensitivity of reception, to improve the ultimate value of distance between sensor and the material to be detected; The carbonyl iron dust sheet is the effect of playing the insulation magnetic conduction; Be equal to a reverse switch; Magnetic field is passed through and the complete conductively-closed of electric field,, and farthest eliminated electrical noise in the circuit so that the PCB magnetic test coil only receives the electromotive force that ultrasonic vibration causes in the material to be detected.This Design of Sensor structure can at utmost reduce electrical noise, so that employed prime amplifier can improve enlargement factor as much as possible, and then has increased the distance of lifting from when detecting.This laser-electromagnetic acoustic nondestructive detection system; Need not couplant, can go out ultrasound wave by long-distance activating; And not Stimulated Light incident angle, metal material geometric configuration and surface roughness affects; Lift from the electromagnetic ultrasonic transducer and the signal filtering amplifying unit of distance through designing height; Can make electromagnetic ultrasonic transducer is to receive in 0～10 mm when ultrasound wave runs into defective the shear wave of wave mode conversion and the shear wave of defective diffraction to take place 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 bigger rugged surroundings such as roughness, and this is that present conventional supersonic detection method and system are difficult to realize.This method device therefor is simple, and is easy to operate, is easy to practicability, and measuring accuracy is high, and favorable repeatability helps the further promotion and application of laser-electromagnetic acoustic detection technique, has bigger economic benefit and social benefit.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.Fig. 1 is a kind of laser-electromagnetic acoustic nondestructive detection system synoptic diagram.Fig. 2 is that aluminium sheet people industrial injury surface crack is made synoptic diagram.Fig. 3 is the structural design drawing of electromagnetic acoustic unit.Fig. 4 is a pre-amplification circuit schematic diagram in the signal amplification filtering unit of laser-electromagnetic acoustic lossless system.Fig. 5 is a 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 defective.Fig. 7 for native system in the laser-electromagnetic acoustic Non-Destructive Testing result who lifts from distance surface of aluminum plate crack defect when being 0 mm.Fig. 8 is the laser-electromagnetic acoustic Non-Destructive Testing result who lifts from distance aluminium surface crack defect when being 0 mm in the document " Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals ".Fig. 9 for native system in the laser-electromagnetic acoustic Non-Destructive Testing result who lifts from distance surface of aluminum plate crack defect when being 10 mm.
Among the figure: 1-wear-resistant ceramic sheet; 2-thermal insulation ceramics sheet; 3-PCB magnetic test coil (Printed Circuit Board, PCB, i.e. printed circuit board); The 4-front end end cover; The 5-sensor outer housing; The 6-trip bolt; End cap in the middle of the 7-; The 8-valve; The 9-rear end cap; The 10-attachment screw; The 11-connector; The 12-prime amplifier; The 13-fixed mount; The 14-backing plate; 15-first circular magnet; 16-second circular magnet; 17-the 3rd circular magnet; 18-the 4th circular magnet; 19-magnet fixed mount; The 20-compressed air outlet; 21-carbonyl iron dust plate.
Embodiment
Below in conjunction with accompanying drawing the principle and the characteristic of patent of the present invention are described, the embodiment that lifts is aluminium sheet (trade mark a 6016) testing result.
Fig. 1 is a kind of high laser-electromagnetic acoustic nondestructive detection system synoptic diagram of lifting from distance.At first with being electrically connected successively between pulsed laser, three-dimensional machinery step device, electromagnetic acoustic receiving element, signal amplification filtering unit, digital oscilloscope and the computing machine, and the electromagnetic acoustic receiving element is fixed in the three-dimensional machinery step device.Calibration pulse laser instrument and line style focusing unit position make the two concentricity placement.The position of cylindrical lens in the adjustment line style focusing unit so that aluminium sheet in and cylindrical lens between distance be 200 mm.
Fig. 2 has provided people's industrial injury surface crack making synoptic diagram in the aluminium sheet; Aluminium sheet is of a size of 700 mm * 600 mm * 20 mm; The surface type people industrial injury of utilizing line cutting technology to go out No. 45 steel surface working is selected to be of a size of 60 mm * 0.5 mm * 0.5 mm surface crack as detected object.Open laser pumping ultrasound unit (1) working power; Setting pulse repetition rate is 10 Hz, and pulse energy is 10 mJ/pluse, utilizes the line style focusing unit will motivate Gaussian-shaped pulse laser and carries out energy centralization and be line style distributing; And the Linear Laser bundle transferred to surface of aluminum plate; Cause the thermal expansion of surface of aluminum plate, directive property is good to motivate, the ultrasonic surface wave of concentration of energy, and resulting Linear Laser hot spot length is 11 mm in the experiment.
Fig. 3 provides the structural design drawing of electromagnetic acoustic unit.Described electromagnetic acoustic receiving element comprises the front end end cover 4 and rear end cap 9 that links together through attachment screw 10, in front end end cover 4 bottoms center through hole is set, and in center through hole, is provided with wear-resistant ceramic sheet 1, above wear-resistant ceramic sheet 1, stacks thermal insulation ceramics sheet 2; Between front end end cover 4 and rear end cap 9, sensor outer housing 5 is set; End cap 7 in the middle of said sensor outer housing 5 tops are provided with; Sensor outer housing 5 bottoms are corresponding with the center through hole of front end end cover 4 to be 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; Be electrically connected between PCB magnetic test coil and the prime amplifier;
At sensor outer housing 5 set inside magnet fixed mounts 19, the 4th circular magnet 18 is set in magnet fixed mount 19, above the 4th circular magnet 18, stack the 3rd circular magnet 17, the second circular magnet 16 and first circular magnet 15 successively; Above the 4th circular magnet 18, be provided with and be connected the fixed mount 13 on the sensor outer housing 5; The 4th circular magnet 18 diameters＜the 3rd circular magnet 17 diameters＜second circular magnet, 16 diameters＜first circular magnet, 15 diameters; Between fixed mount 13 and the 4th circular magnet 18, backing plate 14 is set; Fixed mount 13 tops are provided with prime amplifier 12; On middle end cap 7, connector 11 is set; Be electrically connected between prime amplifier and the connector.
Valve 8 is set on rear end cap 9.What PCB magnetic test coil 3 adopted is the butterfly project organization.
Open the working power of electromagnetic acoustic receiving element and three-dimensional machinery step device; Distance and horizontal level between adjustment electromagnetic acoustic receiving element and the aluminium sheet are on the same horizontal line center of the Linear Laser spot of electromagnetic acoustic receiving element and surface of aluminum plate.Among the embodiment distance between electromagnetic acoustic receiving element and the aluminium sheet is chosen to be 0 mm and 10 mm respectively, is used 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 when being 0 mm enlargement factor elect 11000 enlargement factors when lifting from distance and being 10 mm as and elect 26000 as; The correcting digital oscillograph is also set it and is in the peak records state, and confirmation signal amplification filtering unit, digital oscilloscope and computing machine are in UNICOM's state then.
Fig. 6 has provided a kind of laser-electromagnetic acoustic lossless detection method principle schematic of contactless metal material surface defective.Utilize described electromagnetic acoustic receiving element; Make the residing horizontal line direction of its type laser spot along the line and electromagnetic acoustic receiving element center carry out scanning and observe digital oscilloscope; When scanning to defective locations; Can receive surface wave the shear wave signal that the wave mode conversion is produced takes place when running into surface imperfection, and convert it into electric signal and transfer to signal amplification filtering unit, according to electromagnetic induction principle; Distance one between electromagnetic acoustic receiving element and surface of aluminum plate regularly; Signal amplitude received when the electromagnetic acoustic receiving element is positioned at directly over the defective is maximum, and the signal this state under is used to judge defective locations and size, and by computing machine this signal is carried out that host computer shows, record, preserves and processing.
Fig. 7 has provided in this detection system that distance is that distance is 0 mm condition lower surface defect detection signal between 120 mm, electromagnetic ultrasonic transducer and the aluminium sheet between the 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 the 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 the aluminium sheet, peak-to-peak value is about 0.2 mV.Comparison diagram 6 can find that the flaw indication amplitude that native system receives is about 20000 times of document result.
Fig. 9 has provided in this detection system that distance is that distance is 10 mm condition lower surface defect detection signals between 120 mm, electromagnetic ultrasonic transducer and the aluminium sheet between the 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 (9)
1. laser-electromagnetic acoustic nondestructive detection system is characterized in that it comprises: pulsed laser, and described pulsed laser is for transferring Q formula YAG pulsed laser; Pulsed laser output laser to line style focusing unit;
The 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 used for the focal length place with distance adjustment to the line style condenser lens between line style focusing unit and the metal material to be detected; Described line style focusing unit is used for pulse laser is carried out energy centralization and be line style distributing, and the Linear Laser bundle is transferred to metal material surface, causes the thermal expansion of metal material surface, and directive property is good to motivate, the ultrasound wave of concentration of energy;
The electromagnetic acoustic receiving element, described electromagnetic acoustic receiving element can motivate 10～200 mJ/pulse pulse lasers in 0～10 mm scope in metal material ultrasonic shear waves signal or diffraction shear wave signal receive and are converted into electric signal and export signal amplification filtering unit to;
The 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 the three-dimensional machinery step device;
Signal amplification filtering unit, described signal amplification filtering unit comprise prime amplifier and two parts of analog filter; Signal amplification filtering unit exports digital oscilloscope to after the electric signal of electromagnetic acoustic receiving element output is handled;
Electrically connect together digital oscilloscope and computing machine in addition.
2. laser according to claim 1-electromagnetic acoustic nondestructive detection system is characterized in that pulse width 8～15 ns of said accent Q formula YAG pulsed laser, wavelength 1064 nm, and energy 0～200 mJ/pulse, pulse repetition rate is 1～20 Hz.
3. laser according to claim 1-electromagnetic acoustic nondestructive detection system is characterized in that described signal amplification filtering unit is filtering to 0.5～4 MHz with the ultrasonic frequency in the metal material, and the signal total magnification is 0～141000 times.
4. laser according to claim 1-electromagnetic acoustic nondestructive detection system; It is characterized in that described electromagnetic acoustic receiving element comprises front end end cover and the rear end cap that links together through attachment screw; In the front end end cover bottom center through hole is set; In center through hole, be provided with the wear-resistant ceramic sheet, above the wear-resistant ceramic sheet, stack the thermal insulation ceramics sheet;
Between front end end cover and rear end cap, sensor outer housing is set; End cap in the middle of said sensor outer housing top is provided with; The bottom is corresponding with the center through hole of front end end cover to be provided with central mounting hole; The carbonyl iron dust plate is set in central mounting hole, between carbonyl iron dust plate and thermal insulation ceramics sheet, is provided with the PCB magnetic test coil; Be electrically connected between PCB magnetic test coil and the prime amplifier, signal conveys to the prime amplifier that is used for the PCB magnetic test coil is received carries out processing and amplifying;
At sensor outer housing set inside magnet fixed mount, the 4th circular magnet is set in the magnet fixed mount, above the 4th circular magnet, stack the 3rd circular magnet successively, second circular magnet and first circular magnet;
Above the 4th circular magnet, be provided with and be connected the fixed mount on the sensor outer housing.
5. laser according to claim 4-electromagnetic acoustic nondestructive detection system is characterized in that the 4th circular magnet diameter＜the 3rd circular magnet diameter＜second circular magnet diameter＜first circular magnet diameter.
6. laser according to claim 4-electromagnetic acoustic nondestructive detection system is characterized in that between fixed mount and the 4th circular magnet, backing plate being set.
7. laser according to claim 4-electromagnetic acoustic nondestructive detection system is characterized in that the fixed mount top is provided with prime amplifier; Cover in intermediate ends connector is set; Be electrically connected between prime amplifier and the connector, be used for signal conveys to the filtering circuit of prime amplifier output is carried out Filtering Processing.
8. laser according to claim 4-electromagnetic acoustic nondestructive detection system is characterized in that on rear end cap, being provided with valve.
9. laser according to claim 4-electromagnetic acoustic nondestructive detection system, what it is characterized in that the employing of PCB magnetic test coil is the butterfly project organization.
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