CN105372335B - A kind of electromagnetic ultrasonic probe - Google Patents
A kind of electromagnetic ultrasonic probe Download PDFInfo
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- CN105372335B CN105372335B CN201510937044.1A CN201510937044A CN105372335B CN 105372335 B CN105372335 B CN 105372335B CN 201510937044 A CN201510937044 A CN 201510937044A CN 105372335 B CN105372335 B CN 105372335B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
Abstract
The present invention relates to a kind of electromagnetic ultrasonic probe, it is characterized in that the electromagnetic ultrasonic probe includes pre-amplifying module, separation layer, shell, receiving coil and permanent magnetic device；The outer casing top surface is provided with toggle switch, electric source line interface and BNC connector, the inside bottom surface of shell is provided with separation layer, two center sides of shell are equipped with perforate, the pre-amplifying module is located at enclosure, and be screwed on the inside of outer casing top surface, the receiving coil is pasted onto on separation layer；Receiving coil is connected by signal wire with the input of pre-amplifying module, and the output end of pre-amplifying module is connected with the BNC connector being fixed on shell, and the gear of the toggle switch control pre-amplifying module, electric source line interface is connected with external power supply；The permanent magnetic device includes permanent magnet, the first arc magnetic boots, the second arc magnetic boots, cross coupler and mechanical knob, and for the permanent magnet among two arc magnetic boots, the middle part of permanent magnet is provided with cross hole slot.
Description
Technical field
The invention belongs to technical field of industrial measurement, and in particular to a kind of electromagnetic ultrasonic probe.
Background technology
In recent years, detection and assessment of the non-destructive testing technology to industrial equipment reliability and security are played more and more important
Effect.Electromagnetic acoustic detection technique because have the characteristics that it is non-contact, be not required to couplant, reproducible, in steel, Aero-Space
And the field of non destructive testing such as railway traffic has huge application prospect.
Compared with traditional piezoelectric detection, electromagnetic acoustic conversion efficiency is relatively low, and the electromagnetic ultrasonic signal collected is faint, very
Extremely can as little as microvolt level, before host computer or amplification module is transferred to, it is easy to by the shadow of the noises such as outside electromagnetic interference
Ring.Particularly in industrial applications, it is easy to because the generation for situations such as outside noise causes flase drop, missing inspection so that electromagnetism
The application of ultrasonic detecting technology receives larger limitation.
CN 102023186.B disclose a kind of electromagnetic ultrasonic probe, and provide and detect pipeline using the electromagnetic ultrasonic probe
Method, it is possible to achieve to the on-line checking of wheel-tyre defect；CN 101701810, which discloses one kind, can reduce echo of magnet
Electromagnetic acoustic receiver；CN101713642.B discloses a kind of electromagnetic ultrasonic probe, and it uses impulse mgnet to produce biasing
Magnetic field, avoid the problem of difficult is being moved using the electromagnetic ultrasonic probe of permanent magnet bias magnetic field in metal structure；CN
102706966 disclose a kind of horizontal shear electromagnetic ultrasonic probe, are aided in by applying on the magnetic circuit that is closed in main permanent magnet
Permanent magnet, the test specimen intensity of magnetization of electromagnetic acoustic coil bottom is improved, so as to which electromagnetic ultrasonic signal intensity ratio is traditional
Electromagnetic ultrasonic probe increases by twice, but its increase multiple is still limited, and its output signal is still easily disturbed.
Though above-mentioned electromagnetic ultrasonic probe can realize ultrasound detection, its shortcoming mainly has two：Firstly, since electromagnetism surpasses
The conversion efficiency of sound is relatively low, and the output voltage of traditional electromagnetic ultrasonic probe is all below millivolt level, the even meeting in aluminium sheet detection
As little as microvolt level, signal is from during probe is transferred to subsequent conditioning circuit module or host computer capture card, being highly prone to extraneous electricity
The influence of magnetic disturbance, there is the problem of signal detection failure, this outer portion probe produces bias magnetic field using impulse mgnet, this
Also so that impulse mgnet produces interference to probe output in itself.Secondly, such electromagnetic ultrasonic probe is in commercial Application
By in face of complexity electromagnetic noise, the output signal of probe will be more complicated, increase signal transacting difficulty, or even occur flase drop,
The generation of phenomena such as missing inspection, it greatly limit the application of electromagnetic acoustic detection technique.
The content of the invention
In view of the shortcomings of the prior art, the technical problem that the present invention intends to solve is to provide a kind of electromagnetic ultrasonic probe.The electricity
Magnetic ultrasonic probe by the way that pre-amplifying module is integrated in inside electromagnetic ultrasonic probe, can significantly improve electromagnetic ultrasonic probe to
The electromagnetic ultrasonic signal amplitude of outer output, overcome caused by the low conversion efficiency of electromagnetic acoustic in signals transmission easily by noise
The problem of interference, detected particularly suitable for complex situations electromagnetic acoustic；Meanwhile in electromagnetic ultrasonic probe permanent magnet Rotation Design
Also it is very ingenious, solve the problems, such as that the movement on ferromagnetic metal material of existing electromagnetic ultrasonic probe is difficult and simple to operate.
Pre-amplifying module is simple using two-stage amplification circuit structure, and cost is cheap, and can easily realize the regulation of gain amplifier.This
Invention is integrated in electricity by using the amplifying circuit using field-effect transistor VN88AFD and operational amplifier A D9618JN as core
Inside magnetic ultrasonic probe so that the ultrasonic signal amplitude of electromagnetic ultrasonic probe output significantly improves, up to nearly hundred millivolts, and electricity
Silicon steel laminations inside magnetic ultrasonic probe can effectively reduce influence of the internal vortex to ultrasonic signal so that the electromagnetic acoustic
The conversion efficiency of probe and antijamming capability are remarkably reinforced；In addition, by carrying out rotation control to permanent magnet, biography is efficiently solved
Electromagnetic ultrasonic probe of uniting is moving the problem of difficult in ferromagnetic metal structure.
The present invention solves the technical problem the technical scheme adopted is that providing a kind of electromagnetic ultrasonic probe, its feature
It is that the electromagnetic ultrasonic probe includes pre-amplifying module, separation layer, shell, receiving coil and permanent magnetic device；The outer casing top surface
It is provided with toggle switch, electric source line interface and BNC connector, the inside bottom surface of shell is provided with separation layer, in two sides of shell
The heart is equipped with perforate, and the pre-amplifying module is located at enclosure, and is screwed on the inside of outer casing top surface, described to connect
Take-up circle is pasted onto on separation layer；Receiving coil is connected by signal wire with the input of pre-amplifying module, preposition amplification mould
The output end of block is connected with the BNC connector being fixed on shell, the gear of the toggle switch control pre-amplifying module, power supply
Line interface is connected with external power supply；
The permanent magnetic device includes permanent magnet, the first arc magnetic boots, the second arc magnetic boots, cross coupler and machinery rotation
Button, for the permanent magnet among two arc magnetic boots, the middle part of permanent magnet is provided with cross hole slot, the first arc magnetic boots with
Second arc magnetic boots are arranged symmetrically centered on permanent magnet, and the first arc magnetic boots are placed in the vertical direction of receiving coil, the second arc
Shape magnetic boots are screwed in below pre-amplifying module；The cross coupler passes through the cross bore in the middle part of permanent magnet
Groove, one end of cross coupler are placed in the perforate of shell one side, and the other end of cross coupler passes through shell another side
Perforate pass through shell, and be connected with mechanical knob；Mechanical knob is located at the outside of shell, and mechanical knob passes through cross coupler
Permanent magnet is driven to switch in horizontal and vertical directions.
Compared with prior art, the beneficial effects of the invention are as follows：1. the present invention is believed ultrasound based on the principle of electromagnetic acoustic
Number it is acquired, by setting mechanical knob, realizes regulation and control to permanent magnetic device, solves existing electromagnetic acoustic and visit
Head is moving the problem of difficult on ferromagnetic metal material, and simple to operate, cheap, more suitable for commercial Application；2. this
Invention, can be by the output signal width of electromagnetic ultrasonic probe by the way that pre-amplifying module is integrated in the structure of electromagnetic ultrasonic probe
Value improves nearly thousand times, while signal antijamming capability during subsequent transmission is to capture card or oscillograph is strengthened, drop
Low missing inspection, the possibility of flase drop, effectively increase the reliability of detection；3. the present invention makees by using silicon steel sheet stack chip architecture
For the arc magnetic boots of permanent magnet, the generation of electromagnetic ultrasonic probe internal vortex can be significantly reduced, vortex is avoided and makees in magnetic field
With lower caused ultrasonic wave and its to the interference in electromagnetic acoustic gatherer process, the conversion efficiency of electromagnetic acoustic is improved；④
Pre-amplifying module is by using using field-effect transistor VN88AFD and operational amplifier A D9618JN as core in the present invention
Amplifying circuit, electromagnetic ultrasonic probe output signal can be amplified up to 1000 times, and multiplication factor have 10 times, 100 times and
1000 times of third gear are adjustable.
Brief description of the drawings
Fig. 1 is a kind of overlooking the structure diagram of embodiment of electromagnetic ultrasonic probe of the present invention；
Fig. 2 is the cross section structure diagram in the A-A faces in electromagnetic ultrasonic probe Fig. 1 of the present invention；
Fig. 3 is the cross section structure diagram in the B-B faces in electromagnetic ultrasonic probe Fig. 1 of the present invention；
Fig. 4 is the one-level amplifying circuit schematic diagram of pre-amplifying module 1 in a kind of embodiment of electromagnetic ultrasonic probe of the present invention；
Fig. 5 is the second amplifying circuit schematic diagram of pre-amplifying module 1 in a kind of embodiment of electromagnetic ultrasonic probe of the present invention；
Fig. 6 is the principle schematic that electromagnetic ultrasonic probe of the present invention is used for Experimental Ultrasonic；
Fig. 7 (a) is to implement 170V square wave excitations to piezoelectric probe, continuous 7 cycles, frequency 1MHz, and toggle switch 7 moves
During to the first gear, electromagnetic ultrasonic probe institute gatherer process schematic diagram；
Fig. 7 (b) is to implement 170V square wave excitations to piezoelectric probe, continuous 7 cycles, frequency 1MHz, and toggle switch 7 moves
During to the second gear, electromagnetic ultrasonic probe institute gatherer process schematic diagram；
Fig. 7 (c) is to implement 170V square wave excitations to piezoelectric probe, continuous 7 cycles, frequency 1MHz, and toggle switch moves
During to third gear, electromagnetic ultrasonic probe institute gatherer process schematic diagram；
In figure, 1. pre-amplifying modules, 2. separation layers, 3. shells, 4. receiving coils, 5. permanent magnetic devices, 6.BNC joints,
7. toggle switch, 8. signal wires, 9. electric source line interfaces；501. permanent magnets, 502. first arc magnetic boots, 503. cross couplers,
504. mechanical knobs, 505. second arc magnetic boots, 5011. cross hole slots；10. industrial computer, 11. piezoelectric probes, 12. metallic plates,
13. electromagnetic ultrasonic probe, 14. power supply adaptors, 15. oscillographs.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is further described.Following examples are used to illustrate the present invention, but not
For limiting the protection domain of the claims in the present invention.
Electromagnetic ultrasonic probe (referring to Fig. 1-3) of the present invention includes pre-amplifying module 1, separation layer 2, shell 3, receiving coil
4 and permanent magnetic device 5；The top surface of shell 3 is provided with toggle switch 7, electric source line interface 9 and BNC connector 6, in the bottom surface of shell 3
Side is provided with separation layer 2, and two center sides of shell 3 are equipped with perforate, and the pre-amplifying module 1 is located inside shell 3, and
The inside top surface of shell 3 is screwed in, the receiving coil 4 is pasted onto on separation layer 2；Receiving coil 4 passes through signal wire 8
It is connected with the input of pre-amplifying module 1, the output end of pre-amplifying module 1 and the phase of BNC connector 6 being fixed on shell 3
Even, the toggle switch 7 controls the gear of pre-amplifying module 1, and electric source line interface 9 is connected with external power supply；
The permanent magnetic device 5 includes permanent magnet 501, the first arc magnetic boots 502, the second arc magnetic boots 505, cross coupler
503 and mechanical knob 504, for the permanent magnet 501 among two arc magnetic boots, the middle part of permanent magnet 501 is provided with cross bore
Groove 5011, the first arc magnetic boots 502 and the second arc magnetic boots 505 are arranged symmetrically centered on permanent magnet 501, the first arc
Magnetic boots 502 are placed in the vertical direction of receiving coil 4, and the second arc magnetic boots 505 are screwed under pre-amplifying module 1
Face；For the cross coupler 503 through the cross hole slot 5011 in the middle part of permanent magnet, one end of cross coupler 503 is placed in shell 3
In the perforate of one side, the other end of cross coupler 503 passes through shell 3 by the perforate of the another side of shell 3, and with machinery
Knob 504 is connected；Mechanical knob 504 is located at the outside of shell 3, and mechanical knob 504 drives permanent magnet by cross coupler 503
501 switch in horizontal and vertical directions.
Further characteristic of the invention is that the first arc magnetic boots 502 are formed by stacking by cold-rolled orientation silicon steel piece, often
Layer silicon steel sheet surface scribbles insulated paint；The second arc magnetic boots 505 are made up of high permeability material.
Further characteristic of the invention is that the permanent magnet 501 is made of NdFeB material, and shell 3 is by magnetic conduction steel
Material is made.
Further characteristic of the invention is that the receiving coil 4 is spiral shape, inflection shape or track type, is printed by PCB
Circuit board technology is printed or enamel-covered wire coiling forms.
Further characteristic of the invention is that the pre-amplifying module 1 includes one-level amplifying circuit and two level amplification electricity
Road, one-level amplifying circuit are cascade type amplifying circuit, and second amplifying circuit is in-phase amplification circuit.
Further characteristic of the invention is that the one-level amplifying circuit includes a pair of field-effect transistor VN88AFD；Institute
Stating second amplifying circuit includes operating amplifier with current feedback AD9618JN.
Mechanical knob 504 is located at the outside of shell 3 in figure 3, mechanical knob 504 permanent magnet 501 will be driven horizontal and
Vertical both direction switching.When permanent magnet 501 is horizontally oriented, the suction between electromagnetic ultrasonic probe and tested metallic plate
Reduce, electromagnetic ultrasonic probe can be moved freely；When permanent magnet 501 vertically when, electromagnetic ultrasonic probe will with it is tested
Metallic plate is in close contact, and can gather signal.This controllable rotary operation of permanent magnet 501 solves electromagnetism in the prior art and surpassed
Sonic probe is not easily shifted on measured piece the problem of.
Pre-amplifying module 1 in the present invention is made up of one-level amplifying circuit and second amplifying circuit two parts, and one-level is put
Big circuit is the cascade type amplifying circuit being made up of a pair of low noise junction field effect transistor VN88AFD (referring to Fig. 4),
Second amplifying circuit is the same phase being made up of high speed, low noise, broadband, operating amplifier with current feedback AD9618JN (referring to Fig. 5)
Amplifying circuit.By adjusting the gear of toggle switch 7, pre-amplifying module 1, which can achieve a butt joint, receives 10 times, 100 times of ultrasonic signal
With the regulation of 1000 times of three different gains.
In Fig. 4, one-level amplifying circuit is by field-effect transistor Q1 (VN88AFD), field-effect transistor Q2
(VN88AFD), resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance
R10, potentiometer R11, electric capacity CR3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity
C8, electric capacity C9, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, diode D1 (1N3600), diode D2
(1N3600) and inductance L1 are formed.Resistance R1 one end is connected with receiving coil 4, and the other end is connected with resistance R2；Resistance R2's
The other end and diode D1 negative electrode, diode D2 anode, resistance R3 one end, electric capacity CR3 one end, electric capacity C1 one end
It is connected；Diode D1 anode is connected with diode D2 negative electrode, and is grounded；The resistance R3 other end is another with electric capacity CR3's
End is connected, and is grounded；The electric capacity C1 other end and resistance R4 one end, resistance R5 one end, field-effect transistor Q1 grid
It is connected；The resistance R5 other end is connected with field-effect transistor Q2 grid, and is grounded；The resistance R4 other end is with resistance R6's
One end, resistance R7 one end, electric capacity C11 negative pole, electric capacity C12 one end, electric capacity C13 one end are connected, and electric capacity C12's is another
End is connected with the electric capacity C13 other end, and is grounded；The resistance R6 other end is connected with electric capacity C2 one end, electric capacity C3 one end,
And it is connected with -5V power supply；The electric capacity C2 other end is connected with the electric capacity C3 other end, and is grounded；Field-effect transistor Q1's
Drain electrode is connected with field-effect transistor Q2 source electrode；Field-effect transistor Q1 source electrode and the resistance R7 other end, electric capacity C8
Negative pole, electric capacity C9 negative pole, electric capacity C10 positive pole, electric capacity C11 positive pole are connected；Electric capacity C8 positive pole and electric capacity C9 positive pole
It is connected, and is grounded；Electric capacity C10 negative poles are grounded；Field-effect transistor Q2 drain electrode and resistance R9 one end, electric capacity C14 positive pole,
Electric capacity C6 positive pole, electric capacity C7 positive pole is connected；The resistance R9 other end is connected with electric capacity C4 positive pole, electric capacity C5 positive pole,
And it is connected with+5V power supplys；Electric capacity C4 negative pole is connected with electric capacity C5 negative pole, and is grounded；Electric capacity C6 negative pole is with electric capacity C7's
Negative pole is connected, and is grounded；Electric capacity C14 negative pole is connected with resistance R8 one end；The resistance R8 other end and inductance L1 one end,
Potentiometer R11 first pin is connected；Inductance L1 other end ground connection；Potentiometer R11 second pin amplifies with two level
C-th of pin of operational amplifier U1 in circuit is connected；Potentiometer R11 the 3rd pin is connected with resistance R10 one end；
Resistance R10 other end ground connection.
In Figure 5, second amplifying circuit by operational amplifier U1 (AD9618JN), resistance R12, resistance R13, resistance R14,
Resistance R15, resistance R16, electric capacity C15, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, electric capacity C20, electric capacity C21, electric capacity
Three C22, electric capacity C23, electric capacity C24, electric capacity C25, electric capacity C26, electric capacity C27, inductance L2, inductance L3, monopole toggle switch K1
Composition.Operational amplifier A D9618JN pin a is hanging；Operational amplifier A D9618JN pin b is stirred out for three with monopole
Close K1 d-th of pin, resistance R12 one end is connected；In operational amplifier A D9618JN pin c and one-level amplifying circuit
Potentiometer R11 second pin is connected；Operational amplifier A D9618JN pin d and pin h, electric capacity C18 negative pole, electric capacity
C19 negative pole, electric capacity C20 negative pole is connected, and is connected with -5V power supplys；Electric capacity C18 positive pole is connected with electric capacity C19 positive pole,
And it is grounded；Electric capacity C20 plus earth；The operational amplifier A D9618JN pin g and resistance R12 other end, electric capacity C24
Negative pole is connected；Operational amplifier A D9618JN pin e and pin f, electric capacity C21 positive pole, electric capacity C22 positive poles, electric capacity C23 are just
Pole ,+5V power supplys are connected；Electric capacity C21 negative pole is connected with electric capacity C22 negative poles, electric capacity C23 negative poles, and is grounded；Electric capacity C24 is just
Pole is connected with resistance R16 one end；The resistance R16 other end is connected with electric capacity C25 positive pole, electric capacity C27 positive pole；Electric capacity
C25 negative pole is connected with electric capacity C26 positive pole；Electric capacity C26 negative pole is connected with electric capacity C27 negative pole, inductance L2 one end, and
Output signal to oscillograph 15；The inductance L2 other end is connected with inductance L3 one end；Inductance L3 other end ground connection；Monopole three
Position toggle switch K1 a-th of pin is connected with resistance R13 one end, electric capacity C15 positive pole；Three toggle switch K1's of monopole
B-th of pin is connected with resistance R14 one end, electric capacity C16 positive pole；Three toggle switch K1 of monopole c-th of pin and electricity
Hinder R15 one end, electric capacity C17 positive pole is connected；The resistance R13 other end and resistance R14 other end, resistance R15 it is another
End, electric capacity C15 negative pole, electric capacity C16 negative pole, electric capacity C17 negative pole are connected, and are grounded.
Heretofore described first arc magnetic boots 502 are formed by stacking using multilayer silicon steel sheet, and its stacked system can have more
Kind, but the principle that must be followed is:Silicon steel sheet is vertical with the long line direction for being placed on receiving coil 4 below.Second arc magnetic boots
505 are made up of the good low-carbon steel material of magnetic property.The present invention is used with field-effect transistor VN88AFD and operational amplifier
AD9618JN is the amplifying circuit of core, and by adjusting the gear of toggle switch 7, pre-amplifying module 1 can be by the super of microvolt level
Acoustical signal realizes the regulation of 10 times, 100 times and 1000 times three different gains, according to resistance R13, resistance R14, resistance R15, electricity
Hold C15, electric capacity C16, the difference of electric capacity C17 values, its gain is maximum up to 1000 times.
The present invention use process be (referring to Fig. 6)：Piezoelectric probe is connected using the industrial computer 10 of built-in ultrasonic inspection card
11, it will be positioned over after the daubing coupling agent of piezoelectric probe 11 on metallic plate 12, the piezoelectric probe 11 works in independent emission mode, makees
For source is motivated by ultrasound.Contain crackle in metallic plate 12.Electromagnetic ultrasonic probe 13 of the present invention is placed on metallic plate 12, positioned at piezoelectricity
Between probe 11 and crackle, the power line of electromagnetic ultrasonic probe 13 connects 5V power supply adaptors 14, and the BNC of electromagnetic ultrasonic probe 13 connects
First 6 are connected to oscillograph 15 by BNC lines.The electromagnetic ultrasonic probe 13 of the present invention is used to gather the ultrasonic signal in metallic plate,
The ultrasonic signal includes the ultrasonic signal directly emitted from piezoelectric probe 11, and by the crack deflection in metallic plate 12
Ultrasonic signal.
Embodiment 1
The present embodiment uses the electromagnetic ultrasonic probe of above-mentioned connected mode, and wherein permanent magnet 501 uses NdFeB material system
Into the second arc magnetic boots 505 are made up of low-carbon steel material, and shell 3 is made up of magnetic conduction Steel material, and one-level amplifying circuit and two level are put
The connected mode of big circuit is referring to Fig. 4 and Fig. 5.
Implement 170V square wave excitations to piezoelectric probe 11, in continuous 7 cycles, frequency 1MHz, receiving coil 4 is using folding shape
Coil, toggle switch 7 move to the first gear, and the now gain of pre-amplifying module 1 is 20dB, believe relative to the ultrasound of microvolt level
Number, calculated by the function of circuit this embodiment achieves the regulation to receiving 10 times of gains of ultrasonic signal, obtained reception line
Enclose shown in 4 output voltages such as Fig. 7 (a), can identify and differentiate by piezoelectric probe from the collection signal of the output voltage
11 ultrasonic signals directly launched (first signal in Fig. 7 (a)), and the ultrasonic signal (Fig. 7 (a) to be returned by crack deflection
In second signal).The present embodiment relatively compared with prior art, can be identified and distinguished between substantially direct by piezoelectric probe 11
The ultrasonic signal of transmitting and the ultrasonic signal returned by crack deflection.
Embodiment 2
The present embodiment uses electromagnetic ultrasonic probe described in embodiment 1, to piezoelectric probe implement 170V square wave excitations, continuous 7
Individual cycle, frequency 1MHz, receiving coil 4 move to the second gear using folding shape coil, toggle switch 7, now preposition amplification mould
Block gain is 40dB, relative to the ultrasonic signal of microvolt level, calculates that this embodiment achieves super to receiving by the function of circuit
The regulation of 100 times of gains of acoustical signal, shown in output voltage such as Fig. 7 (b) of obtained receiving coil 4, from the collection signal
Through can clearly identify and differentiate the ultrasonic signal directly launched by piezoelectric probe (first signal in Fig. 7 (b)), and
The ultrasonic signal (second signal in Fig. 7 (b)) returned by crack deflection, the signal amplitude increase than the signal amplitude of the first gear
It is big 10 times.
Embodiment 3
The present embodiment uses electromagnetic ultrasonic probe described in embodiment 1, implements 170V square wave excitations to piezoelectric probe 11, continuously
7 cycles, frequency 1MHz, receiving coil move to third gear using folding shape coil, toggle switch, now pre-amplifying module
Gain is 60dB, relative to the ultrasonic signal of microvolt level, calculates that this embodiment achieves to receiving ultrasound by the function of circuit
The regulation of 1000 times of gains of signal, shown in receiving coil output voltage such as Fig. 7 (c), being gathered from the output voltage in signal can be with
The ultrasonic signal (first signal in Fig. 7 (c)) that significantly identification and resolution are directly launched by piezoelectric probe, and by crack deflection
The ultrasonic signal (second signal in Fig. 7 (c)) returned, the signal amplitude increase about 100 times than the signal amplitude of the first gear.
Described above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement and
Modification, these improvement and modification also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of electromagnetic ultrasonic probe, it is characterized in that the electromagnetic ultrasonic probe includes pre-amplifying module, separation layer, shell, connect
Take-up circle and permanent magnetic device；The outer casing top surface is provided with toggle switch, electric source line interface and BNC connector, in the bottom surface of shell
Side is provided with separation layer, and two center sides of shell are equipped with perforate, and the pre-amplifying module is located at enclosure, and passes through
Screw is fixed on the inside of outer casing top surface, and the receiving coil is pasted onto on separation layer；Receiving coil passes through signal wire and preceding storing
The input of big module is connected, and the output end of pre-amplifying module is connected with the BNC connector being fixed on shell, described to stir out
The gear of control pre-amplifying module is closed, electric source line interface is connected with external power supply；
The permanent magnetic device includes permanent magnet, the first arc magnetic boots, the second arc magnetic boots, cross coupler and mechanical knob, institute
Permanent magnet is stated among two arc magnetic boots, the middle part of permanent magnet is provided with cross hole slot, the first arc magnetic boots and second
Arc magnetic boots are arranged symmetrically centered on permanent magnet, and the first arc magnetic boots are placed in the vertical direction of receiving coil, the second arc magnetic
Boots are screwed in below pre-amplifying module；The cross coupler is through the cross hole slot in the middle part of permanent magnet, and ten
One end of word shaft coupling is placed in the perforate of shell one side, the perforate that the other end of cross coupler passes through shell another side
It is connected through shell, and with mechanical knob；Mechanical knob is located at the outside of shell, and mechanical knob is driven forever by cross coupler
Magnet switches in horizontal and vertical directions.
2. electromagnetic ultrasonic probe according to claim 1, it is characterised in that the first arc magnetic boots are by cold-rolled orientation silicon
Steel disc is formed by stacking, and every layer of silicon steel sheet surface scribbles insulated paint；The second arc magnetic boots are made up of high permeability material.
3. electromagnetic ultrasonic probe according to claim 1, it is characterised in that the permanent magnet is made of NdFeB material,
Shell is made up of magnetic conduction Steel material.
4. electromagnetic ultrasonic probe according to claim 1, it is characterised in that the receiving coil be spiral shape, inflection shape or
Track type, is printed by PCB printed circuit board technologies or enamel-covered wire coiling forms.
5. according to any described electromagnetic ultrasonic probes of claim 1-4, it is characterised in that the pre-amplifying module includes one
Level amplifying circuit and second amplifying circuit, one-level amplifying circuit are cascade type amplifying circuit, and second amplifying circuit is same phase
Amplifying circuit.
6. electromagnetic ultrasonic probe according to claim 5, it is characterised in that the one-level amplifying circuit includes a pair effects
Answer transistor VN88AFD；The second amplifying circuit includes operating amplifier with current feedback AD9618JN.
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| CN201510937044.1A CN105372335B (en) | 2015-12-14 | 2015-12-14 | A kind of electromagnetic ultrasonic probe |
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| CN105628786B (en) * | 2016-03-30 | 2018-10-26 | 湖州市特种设备检测研究院 | A kind of electromagnetic ultrasonic probe |
| CN108717081A (en) * | 2018-08-14 | 2018-10-30 | 河北工业大学 | Portable electromagnetic ultrasonic signal digital processing reception device based on FPGA and method |
| CN109507303B (en) * | 2018-12-29 | 2021-08-10 | 西安理工大学 | Self-adaptive program-controlled receiving and processing device and method for electromagnetic ultrasonic echo signals |
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| CN205175971U (en) * | 2015-12-14 | 2016-04-20 | 河北工业大学 | Electromagnetic ultrasonic probe |
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| DE10259409B3 (en) * | 2002-12-19 | 2004-05-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electromagnetic ultrasonic test head for non-destructive workpiece testing with transmission coil and reception coil wound around part circular magnetic core adjacent pre-magnetization device |
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