CN105372335A - Electromagnetic ultrasonic probe - Google Patents
Electromagnetic ultrasonic probe Download PDFInfo
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- CN105372335A CN105372335A CN201510937044.1A CN201510937044A CN105372335A CN 105372335 A CN105372335 A CN 105372335A CN 201510937044 A CN201510937044 A CN 201510937044A CN 105372335 A CN105372335 A CN 105372335A
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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
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Abstract
The invention relates to an electromagnetic ultrasonic probe which is characterized by comprising a preposition amplifying module, an isolating layer, a shell, a receiving coil and a permanent magnetic device; the top face of the shell is provided with a poking switch, a power line interface and a BNC connector, the inner side of the bottom face of the shell is provided with the isolating layer, the centers of the two side faces of the shell are provided with holes respectively, the preposition amplifying module is located in the shell and fixed to the inner side of the top face of the shell through a screw, and the receiving coil is pasted to the isolation layer; the receiving coil is connected with the input end of the preposition amplifying module through a signal line, the output end of the preposition amplifying module is connected with the BNC connector fixed to the shell, the poking switch controls the gear position of the preposition amplifying module, and the power line connector is connected with an external power source; the permanent magnetic device comprises a permanent magnetic body, a first curved magnetic boot, a second curved magnetic boot, a cross coupling and a mechanical knob, a permanent magnetic device is located between the two curved magnetic boots, and the middle of the permanent magnetic body is provided with a cross hole groove.
Description
Technical field
The invention belongs to technical field of industrial measurement, be specifically related to a kind of electromagnetic ultrasonic probe.
Background technology
In recent years, Dynamic Non-Destruction Measurement plays more and more important effect to the detection of commercial unit reliability and security and assessment.Electromagnetic acoustic detection technique because having noncontact, do not need couplant, the feature such as reproducible, at field of non destructive testings such as iron and steel, Aero-Space and railway traffics, there is huge application prospect.
Compared with traditional piezoelectric detection, electromagnetic acoustic conversion efficiency is lower, and the electromagnetic ultrasonic signal collected is faint, even can be low to moderate microvolt level, before being transferred to host computer or amplification module, is easy to the impact being subject to the noises such as outside electromagnetic interference.Particularly in industrial applications, be easy to, because outside noise causes the generation of flase drop, the situation such as undetected, make the application of electromagnetic acoustic detection technique receive larger restriction.
CN102023186.B discloses a kind of electromagnetic ultrasonic probe, and provides the method using this electromagnetic ultrasonic probe testing pipes, can realize the on-line checkingi to wheel-tyre defect; CN101701810 discloses a kind of electromagnetic acoustic receiver reducing echo of magnet; CN101713642.B discloses a kind of electromagnetic ultrasonic probe, and it adopts impulse mgnet to produce bias magnetic field, avoids the problem adopting the electromagnetic ultrasonic probe in permanent magnet bias magnetic field mobile difficulty in metal construction; CN102706966 discloses a kind of horizontal shear electromagnetic ultrasonic probe, by applying auxiliary permanent magnet on the closed magnetic circuit of main permanent magnet, improve the test specimen magnetization of electromagnetic acoustic coil bottom, thus electromagnetic ultrasonic signal strength ratio tradition electromagnetic ultrasonic probe can be increased twice, but it is still limited that it increases multiple, and its output signal is still easily disturbed.
Though above-mentioned electromagnetic ultrasonic probe can realize Ultrasonic Detection, but its shortcoming mainly contains two: first, because the conversion efficiency of electromagnetic acoustic is lower, the output voltage of tradition electromagnetic ultrasonic probe is all below millivolt level, even microvolt level can be low to moderate in aluminium sheet detects, signal is transferred to the process of subsequent conditioning circuit module or host computer capture card from probe, very easily be subject to the impact of outside electromagnetic interference, there is the problem that input lost efficacy, in addition part probe adopts impulse mgnet to produce bias magnetic field, this also makes impulse mgnet itself produce interference to probe output.Secondly, such electromagnetic ultrasonic probe is by the electromagnetic noise in the face of complexity in commercial Application, and the output signal of probe will be more complicated, increases signal transacting difficulty, even there is the generation of flase drop, the phenomenon such as undetected, greatly limit the application of electromagnetic acoustic detection technique.
Summary of the invention
For the deficiencies in the prior art, the technical matters that quasi-solution of the present invention is determined is, provides a kind of electromagnetic ultrasonic probe.This electromagnetic ultrasonic probe is by being integrated in electromagnetic ultrasonic probe inside by pre-amplifying module, the electromagnetic ultrasonic signal amplitude that electromagnetic ultrasonic probe outwards exports can be significantly improved, overcome the low conversion efficiency of electromagnetic acoustic and easily by the problem of noise in the signals transmission that causes, being particularly suitable for complex situations electromagnetic acoustic detects; Meanwhile, in electromagnetic ultrasonic probe, the Rotation Design of permanent magnet is also very ingenious, solves the problem of existing electromagnetic ultrasonic probe mobile difficulty on ferromagnetic metal material, and simple to operate.Pre-amplifying module adopts two-stage amplification circuit structure simple, with low cost, and can realize the adjustment of gain amplifier easily.The present invention is integrated in electromagnetic ultrasonic probe inside by employing with the amplifying circuit that field effect transistor VN88AFD and operational amplifier A D9618JN is core, the ultrasonic signal amplitude that electromagnetic ultrasonic probe is exported significantly improves, nearly hundred millivolts can be reached, and the silicon steel laminations of electromagnetic ultrasonic probe inside effectively can reduce the impact of internal vortex on ultrasonic signal, the conversion efficiency of this electromagnetic ultrasonic probe and antijamming capability are obviously strengthened; In addition, control by carrying out rotation to permanent magnet, efficiently solve the problem of traditional electromagnetic ultrasonic probe mobile difficulty in ferromagnetic metal structure.
The present invention solve the technical problem adopted technical scheme, provides a kind of electromagnetic ultrasonic probe, it is characterized in that this electromagnetic ultrasonic probe comprises pre-amplifying module, separation layer, shell, receiving coil and permanent magnetic device; Described outer casing top surface is provided with toggle switch, electric source line interface and BNC connector, separation layer is provided with inside the bottom surface of shell, two center side of shell are equipped with perforate, described pre-amplifying module is positioned at enclosure, and being screwed in inside outer casing top surface, described receiving coil is pasted onto on separation layer; Receiving coil is connected with the input end of pre-amplifying module by signal wire, and the output terminal of pre-amplifying module is connected with the BNC connector be fixed on shell, and described toggle switch controls the gear of pre-amplifying module, and electric source line interface is connected with external power supply;
Described permanent magnetic device comprises permanent magnet, the first arc magnetic boots, the second arc magnetic boots, cross coupler and mechanical knob, described permanent magnet is positioned in the middle of two arc magnetic boots, the middle part of permanent magnet is provided with cross hole slot, described first arc magnetic boots and the second arc magnetic boots are arranged symmetrically with centered by permanent magnet, first arc magnetic boots are placed in the vertical direction of receiving coil, and the second arc magnetic boots are screwed in below pre-amplifying module; Described cross coupler is through the cross hole slot in the middle part of permanent magnet, and one end of cross coupler is placed in the perforate of shell one side, and the other end of cross coupler passes shell by the perforate of shell another side, and is connected with mechanical knob; Mechanical knob is positioned at the outside of shell, and mechanical knob drives permanent magnet to switch in horizontal and vertical directions by cross coupler.
Compared with prior art, the invention has the beneficial effects as follows: the principle that 1. the present invention is based on electromagnetic acoustic gathers ultrasonic signal, by arranging mechanical knob, achieve the regulating and control to permanent magnetic device, solve the problem of existing electromagnetic ultrasonic probe mobile difficulty on ferromagnetic metal material, and simple to operate, cheap, be more suitable for commercial Application; 2. the present invention is by being integrated in the structure of electromagnetic ultrasonic probe by pre-amplifying module, the output signal amplitude of electromagnetic ultrasonic probe can be improved nearly thousand times, make signal antijamming capability in subsequent transmission is to capture card or oscillographic process strengthen simultaneously, reduce possibility that is undetected, flase drop, effectively improve the reliability of detection; 3. the present invention is by adopting silicon steel sheet stack chip architecture as the arc magnetic boots of permanent magnet, significantly can reduce the generation of electromagnetic ultrasonic probe internal vortex, avoid ultrasound wave that eddy current produces under magnetic fields and to the interference in electromagnetic acoustic gatherer process, improve the conversion efficiency of electromagnetic acoustic; 4. the amplifying circuit that in the present invention, pre-amplifying module is core by employing with field effect transistor VN88AFD and operational amplifier A D9618JN, electromagnetic ultrasonic probe can be outputed signal amplification and can reach 1000 times, and enlargement factor have 10 times, 100 times and 1000 times of third gear adjustable.
Accompanying drawing explanation
Fig. 1 is the plan structure schematic diagram of a kind of embodiment of electromagnetic ultrasonic probe of the present invention;
Fig. 2 is the sectional structure schematic diagram in the A-A face in electromagnetic ultrasonic probe Fig. 1 of the present invention;
Fig. 3 is the sectional structure schematic diagram in the B-B face 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 of electromagnetic ultrasonic probe of the present invention for Experimental Ultrasonic;
Fig. 7 (a) implements 170V square wave excitation to piezoelectric probe, and in continuous 7 cycles, frequency is 1MHz, when toggle switch 7 moves to the first gear, and electromagnetic ultrasonic probe institute gatherer process schematic diagram;
Fig. 7 (b) implements 170V square wave excitation to piezoelectric probe, and in continuous 7 cycles, frequency is 1MHz, when toggle switch 7 moves to the second gear, and electromagnetic ultrasonic probe institute gatherer process schematic diagram;
Fig. 7 (c) implements 170V square wave excitation to piezoelectric probe, and in continuous 7 cycles, frequency is 1MHz, when toggle switch moves to third gear, and electromagnetic ultrasonic probe institute gatherer process schematic diagram;
In figure, 1. pre-amplifying module, 2. separation layer, 3. shell, 4. receiving coil, 5. permanent magnetic device, 6.BNC joint, 7. toggle switch, 8. signal wire, 9. electric source line interface; 501. permanent magnets, 502. first arc magnetic boots, 503. cross couplers, 504. mechanical knob, 505. second arc magnetic boots, 5011. cross hole slots; 10. industrial computer, 11. piezoelectric probes, 12. sheet metals, 13. electromagnetic ultrasonic probes, 14. power supply adaptors, 15. oscillographs.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further described.Following examples for illustration of the present invention, but are not used for limiting the protection domain of the claims in the present invention.
Electromagnetic ultrasonic probe of the present invention (see Fig. 1-3) comprises pre-amplifying module 1, separation layer 2, shell 3, receiving coil 4 and permanent magnetic device 5; Described shell 3 end face is provided with toggle switch 7, electric source line interface 9 and BNC connector 6, separation layer 2 is provided with inside the bottom surface of shell 3, two center side of shell 3 are equipped with perforate, it is inner that described pre-amplifying module 1 is positioned at shell 3, and being screwed in shell 3 inside top surface, described receiving coil 4 is pasted onto on separation layer 2; Receiving coil 4 is connected with the input end of pre-amplifying module 1 by signal wire 8, the output terminal of pre-amplifying module 1 is connected with the BNC connector 6 be fixed on shell 3, described toggle switch 7 controls the gear of pre-amplifying module 1, and electric source line interface 9 is connected with external power supply;
Described permanent magnetic device 5 comprises permanent magnet 501, first arc magnetic boots 502, second arc magnetic boots 505, cross coupler 503 and mechanical knob 504, described permanent magnet 501 is positioned in the middle of two arc magnetic boots, the middle part of permanent magnet 501 is provided with cross hole slot 5011, described first arc magnetic boots 502 and the second arc magnetic boots 505 are arranged symmetrically with centered by permanent magnet 501, first arc magnetic boots 502 are placed in the vertical direction of receiving coil 4, and the second arc magnetic boots 505 are screwed in below pre-amplifying module 1; Described cross coupler 503 is through the cross hole slot 5011 in the middle part of permanent magnet, one end of cross coupler 503 is placed in the perforate of shell 3 one side, the other end of cross coupler 503 passes shell 3 by the perforate of shell 3 another side, and is connected with mechanical knob 504; Mechanical knob 504 is positioned at the outside of shell 3, and mechanical knob 504 drives permanent magnet 501 to switch in horizontal and vertical directions by cross coupler 503.
Of the present inventionly be further characterized in that described first arc magnetic boots 502 are formed by stacking by cold-rolled orientation silicon steel sheet, every layer of siliconized plate surface scribbles insullac; Described second arc magnetic boots 505 are made for high permeability material.
Of the present inventionly be further characterized in that described permanent magnet 501 adopts NdFeB material to make, shell 3 is made up of magnetic conduction Steel material.
Of the present inventionly be further characterized in that described receiving coil 4 is spirality, inflection shape or track type, to be printed by PCB printed circuit board technology or enameled wire coiling forms.
Of the present inventionly be further characterized in that described pre-amplifying module 1 comprises one-level amplifying circuit and second amplifying circuit, one-level amplifying circuit is cascade type amplifying circuit, and second amplifying circuit is in-phase amplification circuit.
Of the present inventionly be further characterized in that described one-level amplifying circuit comprises a pair field effect transistor VN88AFD; Described second amplifying circuit comprises operating amplifier with current feedback AD9618JN.
Mechanical knob 504 is positioned at the outside of shell 3 in figure 3, and mechanical knob 504 will drive permanent magnet 501 to switch in horizontal and vertical directions.When permanent magnet 501 is in horizontal direction, the suction between electromagnetic ultrasonic probe and tested sheet metal reduces, and can move freely electromagnetic ultrasonic probe; When permanent magnet 501 vertically time, electromagnetic ultrasonic probe will with tested sheet metal close contact, and can collection signal.This controllable rotary operation of permanent magnet 501 solves the problem of electromagnetic ultrasonic probe not easily movement on measured piece in prior art.
Pre-amplifying module 1 in the present invention is made up of one-level amplifying circuit and second amplifying circuit two parts, one-level amplifying circuit (see Fig. 4) is the cascade type amplifying circuit be made up of a pair low noise junction field effect transistor VN88AFD, and second amplifying circuit (see Fig. 5) is the in-phase amplification circuit be made up of high speed, low noise, broadband, operating amplifier with current feedback AD9618JN.By regulating the gear of toggle switch 7, pre-amplifying module 1 can achieve a butt joint and receive the adjustment of three different gains of ultrasonic signal 10 times, 100 times and 1000 times.
In the diagram, 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 L 1 form.One end of resistance R1 is connected with receiving coil 4, and the other end is connected with resistance R2; The anode of the other end of resistance R2 and the negative electrode of diode D1, diode D2, one end of resistance R3, one end of electric capacity CR3, one end of electric capacity C1 are connected; The anode of diode D1 is connected with the negative electrode of diode D2, and ground connection; The other end of resistance R3 is connected with the other end of electric capacity CR3, and ground connection; The other end of electric capacity C1 is connected with one end of one end of resistance R4, resistance R5, the grid of field effect transistor Q1; The other end of resistance R5 is connected with the grid of field effect transistor Q2, and ground connection; One end of the other end of resistance R4 and one end of resistance R6, resistance R7, the negative pole of electric capacity C11, one end of electric capacity C12, one end of electric capacity C13 are connected, and the other end of electric capacity C12 is connected with the other end of electric capacity C13, and ground connection; The other end of resistance R6 is connected with one end of one end of electric capacity C2, electric capacity C3, and is connected with the power supply of-5V; The other end of electric capacity C2 is connected with the other end of electric capacity C3, and ground connection; The drain electrode of field effect transistor Q1 is connected with the source electrode of field effect transistor Q2; The negative pole of the source electrode of field effect transistor Q1 and the other end of resistance R7, electric capacity C8, the negative pole of electric capacity C9, the positive pole of electric capacity C10, the positive pole of electric capacity C11 are connected; The positive pole of electric capacity C8 is connected with the positive pole of electric capacity C9, and ground connection; Electric capacity C10 minus earth; The positive pole of the drain electrode of field effect transistor Q2 and one end of resistance R9, electric capacity C14, the positive pole of electric capacity C6, the positive pole of electric capacity C7 are connected; The other end of resistance R9 is connected with the positive pole of the positive pole of electric capacity C4, electric capacity C5, and is connected with+5V power supply; The negative pole of electric capacity C4 is connected with the negative pole of electric capacity C5, and ground connection; The negative pole of electric capacity C6 is connected with the negative pole of electric capacity C7, and ground connection; The negative pole of electric capacity C14 is connected with one end of resistance R8; The other end of resistance R8 is connected with first pin of one end of inductance L 1, potentiometer R11; The other end ground connection of inductance L 1; Second pin of potentiometer R11 is connected with c the pin of the operational amplifier U1 in second amplifying circuit; 3rd pin of potentiometer R11 is connected with one end of resistance R10; The other end ground connection of resistance R10.
In Figure 5, second amplifying circuit is made up of 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 C22, electric capacity C23, electric capacity C24, electric capacity C25, electric capacity C26, electric capacity C27, inductance L 2, inductance L 3, one pole three toggle switch K1.The pin a of operational amplifier A D9618JN is unsettled; D the pin of pin b and one pole three toggle switch K1, one end of resistance R12 of operational amplifier A D9618JN are connected; The pin c of operational amplifier A D9618JN is connected with second pin of the potentiometer R11 in one-level amplifying circuit; The pin d of operational amplifier A D9618JN is connected with the negative pole of pin h, electric capacity C18, the negative pole of electric capacity C19, the negative pole of electric capacity C20, and is connected with-5V power supply; The positive pole of electric capacity C18 is connected with the positive pole of electric capacity C19, and ground connection; The plus earth of electric capacity C20; The pin g of operational amplifier A D9618JN is connected with the negative pole of the other end of resistance R12, electric capacity C24; The pin e of operational amplifier A D9618JN is connected with the positive pole of pin f, electric capacity C21, electric capacity C22 positive pole, electric capacity C23 positive pole ,+5V power supply; The negative pole of electric capacity C21 is connected with electric capacity C22 negative pole, electric capacity C23 negative pole, and ground connection; The positive pole of electric capacity C24 is connected with one end of resistance R16; The other end of resistance R16 is connected with the positive pole of the positive pole of electric capacity C25, electric capacity C27; The negative pole of electric capacity C25 is connected with the positive pole of electric capacity C26; The negative pole of electric capacity C26 is connected with one end of the negative pole of electric capacity C27, inductance L 2, and outputs signal to oscillograph 15; The other end of inductance L 2 is connected with one end of inductance L 3; The other end ground connection of inductance L 3; A the pin of one pole three toggle switch K1 is connected with one end of resistance R13, the positive pole of electric capacity C15; B the pin of one pole three toggle switch K1 is connected with one end of resistance R14, the positive pole of electric capacity C16; C the pin of one pole three toggle switch K1 is connected with one end of resistance R15, the positive pole of electric capacity C17; The other end of the other end of resistance R13 and the other end of resistance R14, resistance R15, the negative pole of electric capacity C15, the negative pole of electric capacity C16, the negative pole of electric capacity C17 are connected, and ground connection.
Described in the present invention, the first arc magnetic boots 502 adopt multilayer siliconized plate to be formed by stacking, and its stacked system can have multiple, but the principle that must follow is: siliconized plate is vertical with the long line direction of the receiving coil 4 put thereunder.Second arc magnetic boots 505 are made up of the low-carbon steel material that magnetic property is good.The amplifying circuit that it is core with field effect transistor VN88AFD and operational amplifier A D9618JN that the present invention adopts, by regulating the gear of toggle switch 7, the ultrasonic signal of microvolt level can be realized the adjustment of 10 times, 100 times and 1000 times three different gains by pre-amplifying module 1, according to the difference of resistance R13, resistance R14, resistance R15, electric capacity C15, electric capacity C16, electric capacity C17 value, its gain is maximum reaches 1000 times.
Use procedure of the present invention (see Fig. 6) is: adopt the industrial computer 10 of built-in ultrasonic inspection card to connect piezoelectric probe 11, be positioned on sheet metal 12 by after piezoelectric probe 11 daubing coupling agent, this piezoelectric probe 11 works in independent emission mode, as ultrasonic action source.Containing crackle in sheet metal 12.Be placed on sheet metal 12 by electromagnetic ultrasonic probe 13 of the present invention, between piezoelectric probe 11 and crackle, the power lead of electromagnetic ultrasonic probe 13 connects 5V power supply adaptor 14, and the BNC connector 6 of electromagnetic ultrasonic probe 13 is connected to oscillograph 15 by BNC line.Electromagnetic ultrasonic probe 13 of the present invention is for gathering the ultrasonic signal in sheet metal, and this ultrasonic signal comprises the ultrasonic signal directly emitted from piezoelectric probe 11, and by the ultrasonic signal of the crack deflection in sheet metal 12.
Embodiment 1
The present embodiment adopts the electromagnetic ultrasonic probe of above-mentioned connected mode, wherein permanent magnet 501 adopts NdFeB material to make, 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 the connected mode of one-level amplifying circuit and second amplifying circuit is see Fig. 4 and Fig. 5.
170V square wave excitation is implemented to piezoelectric probe 11, continuous 7 cycles, frequency is 1MHz, receiving coil 4 adopts folding shape coil, toggle switch 7 moves to the first gear, now pre-amplifying module 1 gain is 20dB, relative to the ultrasonic signal of microvolt level, the adjustment that this embodiment achieves receiving ultrasonic signal 10 times of gains is calculated by the function of circuit, receiving coil 4 output voltage obtained is as shown in Fig. 7 (a), from the collection signal of this output voltage, can identify and differentiate the ultrasonic signal (in Fig. 7 (a) first signal) directly launched by piezoelectric probe 11, and the ultrasonic signal (in Fig. 7 (a) second signal) of to be returned by crack deflection.The present embodiment relatively compared with prior art, can obviously identify and distinguish the ultrasonic signal directly launched by piezoelectric probe 11 and the ultrasonic signal of being returned by crack deflection.
Embodiment 2
The present embodiment adopts electromagnetic ultrasonic probe described in embodiment 1, 170V square wave excitation is implemented to piezoelectric probe, continuous 7 cycles, frequency is 1MHz, receiving coil 4 adopts folding shape coil, toggle switch 7 moves to the second gear, now pre-amplifying module gain is 40dB, relative to the ultrasonic signal of microvolt level, the adjustment that this embodiment achieves receiving ultrasonic signal 100 times of gains is calculated by the function of circuit, the output voltage of the receiving coil 4 obtained is as shown in Fig. 7 (b), clearly can identify from this collection signal and differentiate the ultrasonic signal (in Fig. 7 (b) first signal) directly launched by piezoelectric probe, and the ultrasonic signal (in Fig. 7 (b) second signal) of to be returned by crack deflection, this signal amplitude increases 10 times than the signal amplitude of the first gear.
Embodiment 3
The present embodiment adopts electromagnetic ultrasonic probe described in embodiment 1, 170V square wave excitation is implemented to piezoelectric probe 11, continuous 7 cycles, frequency is 1MHz, receiving coil adopts folding shape coil, toggle switch moves to third gear, now pre-amplifying module gain is 60dB, relative to the ultrasonic signal of microvolt level, the adjustment that this embodiment achieves receiving ultrasonic signal 1000 times of gains is calculated by the function of circuit, receiving coil output voltage is as shown in Fig. 7 (c), significantly can identify from this output voltage collection signal and differentiate the ultrasonic signal (in Fig. 7 (c) first signal) directly launched by piezoelectric probe, and the ultrasonic signal (in Fig. 7 (c) second signal) of to be returned by crack deflection, this signal amplitude increases about 100 times than the signal amplitude of the first gear.
The above is only the preferred embodiment of the present invention; be not limited to the present invention; should be understood that; for those skilled in the art; under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (6)
1. an electromagnetic ultrasonic probe, is characterized in that this electromagnetic ultrasonic probe comprises pre-amplifying module, separation layer, shell, receiving coil and permanent magnetic device; Described outer casing top surface is provided with toggle switch, electric source line interface and BNC connector, separation layer is provided with inside the bottom surface of shell, two center side of shell are equipped with perforate, described pre-amplifying module is positioned at enclosure, and being screwed in inside outer casing top surface, described receiving coil is pasted onto on separation layer; Receiving coil is connected with the input end of pre-amplifying module by signal wire, and the output terminal of pre-amplifying module is connected with the BNC connector be fixed on shell, and described toggle switch controls the gear of pre-amplifying module, and electric source line interface is connected with external power supply;
Described permanent magnetic device comprises permanent magnet, the first arc magnetic boots, the second arc magnetic boots, cross coupler and mechanical knob, described permanent magnet is positioned in the middle of two arc magnetic boots, the middle part of permanent magnet is provided with cross hole slot, described first arc magnetic boots and the second arc magnetic boots are arranged symmetrically with centered by permanent magnet, first arc magnetic boots are placed in the vertical direction of receiving coil, and the second arc magnetic boots are screwed in below pre-amplifying module; Described cross coupler is through the cross hole slot in the middle part of permanent magnet, and one end of cross coupler is placed in the perforate of shell one side, and the other end of cross coupler passes shell by the perforate of shell another side, and is connected with mechanical knob; Mechanical knob is positioned at the outside of shell, and mechanical knob drives permanent magnet to switch in horizontal and vertical directions by cross coupler.
2. electromagnetic ultrasonic probe according to claim 1, it is characterized in that described first arc magnetic boots are formed by stacking by cold-rolled orientation silicon steel sheet, every layer of siliconized plate surface scribbles insullac; Described second arc magnetic boots are that high permeability material is made.
3. electromagnetic ultrasonic probe according to claim 1, it is characterized in that described permanent magnet adopts NdFeB material to make, shell is made up of magnetic conduction Steel material.
4. electromagnetic ultrasonic probe according to claim 1, is characterized in that described receiving coil is spirality, inflection shape or track type, is printed or enameled wire coiling forms by PCB printed circuit board technology.
5., according to the arbitrary described electromagnetic ultrasonic probe of claim 1-4, it is characterized in that described pre-amplifying module comprises one-level amplifying circuit and second amplifying circuit, one-level amplifying circuit is cascade type amplifying circuit, and second amplifying circuit is in-phase amplification circuit.
6. electromagnetic ultrasonic probe according to claim 5, is characterized in that described one-level amplifying circuit comprises a pair field effect transistor VN88AFD; Described second amplifying circuit comprises operating amplifier with current feedback AD9618JN.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105628786A (en) * | 2016-03-30 | 2016-06-01 | 湖州市特种设备检测研究院 | 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 |
| CN109507303A (en) * | 2018-12-29 | 2019-03-22 | 西安理工大学 | The adaptive program-controlled receiving and processing device and its method of electromagnetic acoustic echo-signal |
| CN117168573A (en) * | 2023-08-16 | 2023-12-05 | 北京科技大学 | Pipeline liquid level height detection device and method based on electromagnetic ultrasonic longitudinal wave |
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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 |
| CN109507303A (en) * | 2018-12-29 | 2019-03-22 | 西安理工大学 | The adaptive program-controlled receiving and processing device and its method of electromagnetic acoustic echo-signal |
| CN117168573A (en) * | 2023-08-16 | 2023-12-05 | 北京科技大学 | Pipeline liquid level height detection device and method based on electromagnetic ultrasonic longitudinal wave |
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