CN205067420U - Electromagnetic acoustic detection device from perception operating point - Google Patents
Electromagnetic acoustic detection device from perception operating point Download PDFInfo
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- CN205067420U CN205067420U CN201520831873.7U CN201520831873U CN205067420U CN 205067420 U CN205067420 U CN 205067420U CN 201520831873 U CN201520831873 U CN 201520831873U CN 205067420 U CN205067420 U CN 205067420U
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Abstract
The utility model discloses an electromagnetic acoustic detection device from perception operating point, device include from perception electromagnetic acoustic sensor, electromagnetic acoustic detector and magnetic -field measurement ware, the electromagnetic acoustic sensor includes exciting coil, permanent magnet, receiving coil, voltage acquisition module and lifts from adjustment mechanism, the coil is placed and is being examined the component top, and permanent magnet places in the exciting coil top along the polarised direction, the voltage acquisition module is used for gathering sign magnetic field intensity's voltage under the difference is lifted from, it is used for adjusting permanent magnet and being examined lifting from between the component to lift from adjustment mechanism, the electromagnetic acoustic detector to exciting coil input sinusoidal impulse electric current, enlargies the electric signal filtering who generates receiving coil simultaneously, carries out the AD conversion and generates the detected signal, the magnetic -field measurement ware for it is interval to generate best operating voltage, in order to adjust from perception electromagnetic acoustic sensor detection achievement point. The utility model discloses electromagnetic acoustic sensor operating point can be optimized, electromagnetic acoustic detectivity is improved.
Description
Technical field
The utility model relates to technical field of nondestructive testing, is specifically related to a kind of electromagnetic supersonic detection device from perception working point.
Background technology
The noncontact that electromagnetic ultrasonic transducer can realize electromagnetic energy and acoustic energy is changed, and has wide application background in Non-Destructive Testing.Due to the part that tested component is also electromagnetic ultrasonic transducer, its electromagnetic property can have influence on the quiescent point of sensor, and then have influence on the conversion efficiency of electromagnetic acoustic, how rationally to determine that electromagnetic ultrasonic transducer working point plays an important role to raising detection sensitivity.The principle of work of electromagnetic ultrasonic transducer is divided into Lorentz force and magnetostrictive effect, all needs to find optimum working zone in testing process, guarantees that conversion efficiency is to improve detection sensitivity.The patent of invention being 200810196822.6 as application number discloses a kind of method (publication date is on June 10th, 2009) determining magnetic striction wave guiding detection work station, mainly through using the first non-electromagnetic pulse signal of detection signal as with reference to signal, change the magnetization of exciting unit and receiving element bias magnetic field respectively, and then the magnetization of bias magnetic field corresponding to the maximal value asking for signal peak peak value, determine the working point that component magnetic striction wave guide detects.This patent, by theory calculate, sets up the relation of the magnetization and magnet magnetization area in component, finds the working point of magnetic striction wave guide detection, and only relate to the sensor construction that magnetizing apparatus provides axialy offset magnetic field with this.But in reality detects, due to electromagnetic ultrasonic transducer principle of work or structure difference, the working point of dissimilar sensor is not known, therefore can not determine the optimum working zone of dissimilar sensor.
Utility model content
For above defect or the Improvement requirement of prior art, the purpose of this utility model is to provide a kind of electromagnetic supersonic detection device from perception working point, realized the optimization of electromagnetic ultrasonic transducer working point by the foundation sign voltage of magnetic field intensity and the corresponding relation of lift-off, improve electromagnetic acoustic detection sensitivity.
It is provide a kind of electromagnetic supersonic detection device from perception working point that the utility model solves the technical scheme that its technical matters adopts, and described device comprises from perception electromagnetic ultrasonic transducer, electromagnetic acoustic detector and magnetic-field measurement device;
Drive coil, permanent magnet, receiving coil, voltage acquisition module and lift-off governor motion is comprised from perception electromagnetic ultrasonic transducer; Described drive coil, is placed on above tested component, for producing alternating magnetic field under the sinusoidal pulse current effect of input; Permanent magnet, is positioned over above drive coil along polarised direction, for generation of static magnetic field, encourages component to produce ultrasonic guided wave signals with described alternating magnetic field acting in conjunction; Receiving coil, is placed on above tested component, generates electric signal for the change of induced voltage under the effect of described ultrasonic guided wave signals; Voltage acquisition module, for gathering the voltage characterizing magnetic field intensity under different lift-off; Lift-off governor motion, for regulating the lift-off between permanent magnet and tested component;
Electromagnetic acoustic detector, its output terminal connects drive coil, to described drive coil input sinusoidal pulse current; Electromagnetic acoustic detector input end connect receiving coil, for receiving coil is generated electric signal filtering, amplification, and carry out A/D conversion generation detection signal;
Magnetic-field measurement device, its input end connects electromagnetic acoustic detector, output terminal connects from perception electromagnetic ultrasonic transducer, generates optimum operating voltage interval, and then to regulate from perception electromagnetic ultrasonic transducer testing point for the detection signal that receives under different lift-off.
As further preferably, described voltage acquisition module is Hall element, Hall element be positioned at apart from permanent magnet surface distance be 1mm-5mm.
As further preferably, described lift-off governor motion comprises:
Hollow shell;
The hollow inner casing installed with described hollow shell central coaxial, described permanent magnet is disposed coaxially in hollow inner casing, realizes axial restraint by the magnet location-plate be fixed on hollow inner casing;
Be arranged in the axial slide between shell and inner casing, for realizing freely sliding axially of inner casing;
Adjusting bolt, it runs through the panel of shell and closing panel and connected with outer casing and inner casing, in its bolt head stud bolt fixed head, is regulated the relative position of shell and inner casing by nut, realizes regulating the lift-off between tested component and permanent magnet.
As further preferably, electromagnetic acoustic detector comprises computing machine, signal generator, power amplifier, signal preprocessor, A/D converter; Wherein
Computing machine, its output terminal connection signal generator, produces sinusoidal pulse current signal for control signal generator;
Signal generator, its input end connects computing machine, and output terminal connects power amplifier, is sent to power amplifier for generation of sinusoidal pulse current signal;
Power amplifier, its input end connection signal generator, output terminal connect drive coil, for by amplify after sinusoidal pulse current signal input stimulus coil;
Signal preprocessor, its input end connects receiving coil, and output terminal connects A/D converter, carries out filter and amplification, and be sent to A/D converter for the electric signal produced receiving coil;
A/D converter, its input end connection signal pretreater, output terminal connects computing machine, is converted to digital signal for the electric signal after receiving described filter and amplification, is sent to computing machine and obtains final detection signal.
Therefore, the utility model can obtain following beneficial effect: in the utility model, magnetic test coil is placed on above tested component, Hall element is arranged near permanent magnet, with the peak-to-peak value of non-electromagnetic pulse signal first in detection signal for characteristic quantity, by regulating the lift-off between permanent magnet and tested component, set up the corresponding relation of electromagnetic acoustic working point and Hall element voltage, accurately can reflect the changes of magnetic field situation of measurement point according to the change of the voltage characterizing magnetic field intensity.The utility model by the spatial magnetic field situation of permanent magnet in Hall element survey sensor to know tested component inside magnetic field intensity, and the corresponding relation of Hall element measuring voltage and lift-off is set up by the peak-to-peak value of the first non-electromagnetic pulse signal of detection signal, and then the optimization of electromagnetic ultrasonic transducer working point is realized by the voltage of Hall element, electromagnetic acoustic detection sensitivity can be improved.In testing process, Hall element voltage-regulation is detected to OK range to realize electromagnetic acoustic.
Accompanying drawing explanation
Fig. 1 for the utility model specific embodiment provide from perception electromagnetic ultrasonic transducer structural drawing;
The electromagnetic supersonic detection device structural drawing from perception working point that Fig. 2 provides for the utility model specific embodiment;
Fig. 3 is the first non-electromagnetic pulse signal waveforms of electromagnetic acoustic detection signal under different lift-off;
Fig. 4 for specific embodiment provide from perception electromagnetic ultrasonic transducer working point schematic diagram;
Fig. 5 for specific embodiment provide from perception electromagnetic ultrasonic transducer Hall element change in voltage schematic diagram.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each embodiment of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
The utility model provides a kind of electromagnetic supersonic detection device from perception working point.Device comprises: from perception electromagnetic ultrasonic transducer, electromagnetic acoustic detector and magnetic-field measurement device.
Drive coil, permanent magnet, receiving coil, voltage acquisition module and lift-off governor motion is comprised from perception electromagnetic ultrasonic transducer; Described drive coil, is placed on above tested component, for producing alternating magnetic field under the sinusoidal pulse current effect of input; Permanent magnet, is positioned over above drive coil along polarised direction, for generation of static magnetic field, encourages component to produce ultrasonic guided wave signals with described alternating magnetic field acting in conjunction; Receiving coil, is placed on above tested component, generates electric signal for the change of induced voltage under the effect of described supersonic guide-wave; Voltage acquisition module, for gathering the voltage characterizing magnetic field intensity under different lift-off; Lift-off governor motion, for regulating the lift-off between permanent magnet and tested component;
Electromagnetic acoustic detector, its output terminal connects drive coil, and input end connects receiving coil, for inputting sinusoidal pulse current to described drive coil; Simultaneously to electric signal filtering, the amplification of receiving coil generation, and carry out A/D conversion generation detection signal;
Magnetic-field measurement device, for determining the maximal value of the first non-electromagnetic pulse signal peak peak value of detection signal, using lift-off corresponding for this maximal value as benchmark job lift-off, find the lift-off contiguous with this benchmark job lift-off as the lift-off that works, the first non-electromagnetic pulse signal peak peak value that work lift-off is corresponding and described maximal value are in predetermined difference range; The voltage corresponding to minimum lift-off and maximum lift-off is determined in benchmark job lift-off with work lift-off, and respectively as the lower limit in optimum operating voltage interval and higher limit, generate optimum operating voltage thus interval, according to optimum operating voltage intervals control from perception electromagnetic ultrasonic transducer testing point.
Wherein, above-mentioned voltage acquisition module is preferably Hall element.
Fig. 1 for the utility model preferred embodiment provide from perception electromagnetic ultrasonic transducer structural drawing.As shown in Figure 1, comprise from perception electromagnetic ultrasonic transducer:
Hollow shell 4, and the hollow inner casing 5 installed with described hollow shell 4 central coaxial;
Permanent magnet 9, it is disposed coaxially in hollow inner casing 5, realizes axial restraint by the magnet location-plate 7 be fixed on inner casing 5;
Be arranged in the axial slide 8 between shell 4 and inner casing 5, for guaranteeing that inner casing 5 can freely slide axially;
Adjusting bolt 15, it runs through the panel 2 and closing panel 3 connected with outer casing 4 and inner casing 5 that are arranged on shell 4, in its bolt head stud bolt fixed head 6, regulated the relative position of shell 4 and inner casing 5 by nut, and then realize regulating the lift-off between tested component and permanent magnet.
Wherein, drive coil 10 and receiving coil 11, it to be wound on coil housing 12 and successively respectively with the excitation joint 16 be arranged on panel 2 with receive joint 17 and be connected; Hall element 13 embeds in the draw-in groove of the adjuster bar 14 be placed on outside permanent magnet 9, is connected with the Hall element joint 1 be arranged on panel 2 simultaneously.
Described sensor outer housing 4 and inner casing 5 make by non-magnet_conductible material.Permanent magnet 9 polarised direction is along sensor axis direction.Regulated the relative position of shell 4 and inner casing 5 by the nut of adjusting bolt 15, and then change the lift-off of ring-shaped magnet 9 and tested component.Described axial slide 8 is arranged between shell 4 and inner casing 5, guarantees that inner casing 5 can freely slide axially.Drive coil 10 is near ring-shaped magnet 9 coiling.Hall element 13 is for measuring magnetic field axial component, and according to detection needs, can place it in the different draw-in grooves of adjuster bar 14, described magnet lift-off causes Hall element 13 change in voltage, and then realizes the optimization of electromagnetic acoustic working point.
In the utility model preferred embodiment, be connected above-mentioned with electromagnetic acoustic detector, magnetic-field measurement device from perception electromagnetic ultrasonic transducer, to realize from perception electromagnetic acoustic testing process.The electromagnetic supersonic detection device structural drawing from perception working point that Fig. 2 provides for the preferred embodiment.
Wherein electromagnetic acoustic detector comprises computing machine 18, signal generator 19, power amplifier 20, signal preprocessor 21, A/D converter 22; Wherein
Computing machine 18, one end connects Hall element 13 interface, and the other end is connection signal generator 19 and A/D converter 22 respectively, produces sinusoidal pulse current signal for control signal generator 19;
Signal generator 19, is sent to power amplifier 20 for generation of sinusoidal pulse current signal;
Power amplifier 20, by excitation joint 16 connect drive coil 10, for by amplify after sinusoidal pulse current signal input stimulus coil 10;
Signal preprocessor 21, connect receiving coil 11 by receiving joint 17, the electric signal produced for receiving receiving coil 11 carries out filter and amplification, and is sent to A/D converter 22;
A/D converter 22, for receiving described electric signal and being converted to digital signal, is sent to computing machine 18 and obtains final detection signal.
Fig. 2 shown device work time, first produce sinusoidal pulse current signal by computing machine 18 control signal generator 19, this signal through power amplifier 20 amplify after, input stimulus coil 10; In sensor, ring-shaped magnet 9 produces static magnetic field, and drive coil 10 produces alternating magnetic field.Under static magnetic field and action of alternating magnetic field, based on magnetostrictive effect, in tested component, excitation produces supersonic guide-wave.Supersonic guide-wave, when receiving coil 11, based on magnetostrictive reaction, causes receiving coil 11 induced voltage to change, and produces electric signal; Electric signal, by after signal preprocessor 21 filter and amplification, inputs computing machine 18 through A/D converter 22, obtains detection signal.Simultaneously, the USB interface of computing machine 18 is worked to Hall element 13 by Hall element joint 1 and powers, be placed on the Hall element 13 outside ring-shaped magnet 9 and the static magnetic field axial component of measurement point is converted to voltage, the voltage of display measurement point in voltage display 23, to characterize the magnetized state of tested component inside.
In concrete testing process, changed the lift-off of ring-shaped magnet 9 and tested component by adjusting bolt 15, the static magnetic field axial component of measurement point changes, and then causes the change of Hall element 13 voltage.Wherein, the magnetic-field component of Hall element 13 measurement is relevant with its placed angle.Under different lift-off condition, according to the peak-to-peak value of non-electromagnetic pulse signal first in detection signal, set up the corresponding relation of working sensor point and Hall element 13 voltage, realize working sensor point from perceptional function.
Fig. 3 is the first non-electromagnetic pulse signal waveforms of electromagnetic acoustic detection signal under different lift-off.Lift-off is respectively 0,1.5mm, 3mm, the peak-to-peak value first increases and then decreases of first non-electromagnetic pulse signal in detection signal.When lift-off is 1.5mm, signal amplitude is large, and detection sensitivity is high, can be considered the working point that this sensor is desirable.
Fig. 4 for specific embodiment provide from perception electromagnetic ultrasonic transducer working point schematic diagram.By adjusting bolt 15, permanent magnet 9 and the lift-off of tested component are increased to 4.5mm by 0, the peak-to-peak value first increases and then decreases of first non-electromagnetic pulse signal in detection signal in figure, when lift-off is between 1mm-2mm, sensor conversion efficiency is maximum, improves detection sensitivity.Therefore, desirable working point is at this lift-off scope inner sensor.
Fig. 5 for specific embodiment provide from perception electromagnetic ultrasonic transducer Hall element change in voltage schematic diagram.Hall element 13 is arranged in the middle part of permanent magnet 9, apart from its surperficial 3mm.Change ring-shaped magnet 9 and the lift-off of tested component by adjusting bolt 15, according to the registration that the magnetic-field measurement device 23 connected from perception electromagnetic ultrasonic transducer Hall element joint shows, record the voltage corresponding with 10 lift-off in Fig. 5.As shown in Figure 5, lift-off causes the static magnetic field axial component of measurement point to change, and voltage presents the trend increased progressively.When lift-off is between 1mm-2mm, the voltage range of Hall element is 3313mV-3360mV.In other words, in Site Detection process, when Hall element voltage is in above-mentioned scope, sensor is in desirable working point.
By Hall element voltage, not only can know tested component inside magnetized state, conveniently can also find the desirable working point of sensor, improve conversion efficiency and detection sensitivity.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. from an electromagnetic supersonic detection device for perception working point, it is characterized in that, described device comprises from perception electromagnetic ultrasonic transducer, electromagnetic acoustic detector and magnetic-field measurement device;
Drive coil, permanent magnet, receiving coil, voltage acquisition module and lift-off governor motion is comprised from perception electromagnetic ultrasonic transducer; Described drive coil, is placed on above tested component, for producing alternating magnetic field under the sinusoidal pulse current effect of input; Permanent magnet, is positioned over above drive coil along polarised direction, for generation of static magnetic field, encourages component to produce ultrasonic guided wave signals with described alternating magnetic field acting in conjunction; Receiving coil, is placed on above tested component, generates electric signal for the change of induced voltage under the effect of described ultrasonic guided wave signals; Voltage acquisition module, for gathering the voltage characterizing magnetic field intensity under different lift-off; Lift-off governor motion, for regulating the lift-off between permanent magnet and tested component;
Electromagnetic acoustic detector, its output terminal connects drive coil, to described drive coil input sinusoidal pulse current; Electromagnetic acoustic detector input end connect receiving coil, for receiving coil is generated electric signal filtering, amplification, and carry out A/D conversion generation detection signal;
Magnetic-field measurement device, its input end connects electromagnetic acoustic detector, output terminal connects from perception electromagnetic ultrasonic transducer, generates optimum operating voltage interval, and then to regulate from perception electromagnetic ultrasonic transducer testing point for the detection signal that receives under different lift-off.
2. the electromagnetic supersonic detection device from perception working point as claimed in claim 1, it is characterized in that, described voltage acquisition module is Hall element, and Hall element is 1mm-5mm apart from permanent magnet surface distance.
3. the electromagnetic supersonic detection device from perception working point as claimed in claim 1, it is characterized in that, described lift-off governor motion comprises:
Hollow shell;
The hollow inner casing installed with described hollow shell central coaxial, described permanent magnet is disposed coaxially in hollow inner casing, realizes axial restraint by the magnet location-plate be fixed on hollow inner casing;
Be arranged in the axial slide between shell and inner casing, for realizing freely sliding axially of inner casing;
Adjusting bolt, it runs through the panel of shell and closing panel and connected with outer casing and inner casing, in its bolt head stud bolt fixed head, is regulated the relative position of shell and inner casing by nut, realizes regulating the lift-off between tested component and permanent magnet.
4. the electromagnetic supersonic detection device from perception working point as claimed in claim 1, it is characterized in that, electromagnetic acoustic detector comprises computing machine, signal generator, power amplifier, signal preprocessor, A/D converter; Wherein
Computing machine, its output terminal connection signal generator, produces sinusoidal pulse current signal for control signal generator;
Signal generator, its input end connects computing machine, and output terminal connects power amplifier, is sent to power amplifier for generation of sinusoidal pulse current signal;
Power amplifier, its input end connection signal generator, output terminal connect drive coil, for by amplify after sinusoidal pulse current signal input stimulus coil;
Signal preprocessor, its input end connects receiving coil, and output terminal connects A/D converter, carries out filter and amplification, and be sent to A/D converter for the electric signal produced receiving coil;
A/D converter, its input end connection signal pretreater, output terminal connects computing machine, is converted to digital signal for the electric signal after receiving described filter and amplification, is sent to computing machine and obtains final detection signal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324105A (en) * | 2016-10-21 | 2017-01-11 | 华中科技大学 | Magnetostrictive guided wave testing device capable of self-sensing operating point |
| CN107843654A (en) * | 2017-11-29 | 2018-03-27 | 沈阳工业大学 | In-service electromagnet ultrasonic changer integrity detecting system |
| CN109085249A (en) * | 2018-08-06 | 2018-12-25 | 重庆三峡学院 | A kind of experimental provision of novel non-contact electromagnetism acoustic emission signal excitation |
| CN112284308A (en) * | 2019-07-24 | 2021-01-29 | 中国石油天然气股份有限公司 | Electromagnetic ultrasonic transverse wave thickness measuring probe |
-
2015
- 2015-10-23 CN CN201520831873.7U patent/CN205067420U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324105A (en) * | 2016-10-21 | 2017-01-11 | 华中科技大学 | Magnetostrictive guided wave testing device capable of self-sensing operating point |
| CN107843654A (en) * | 2017-11-29 | 2018-03-27 | 沈阳工业大学 | In-service electromagnet ultrasonic changer integrity detecting system |
| CN107843654B (en) * | 2017-11-29 | 2023-09-29 | 沈阳工业大学 | In-service electromagnetic ultrasonic transducer integrity detection system |
| CN109085249A (en) * | 2018-08-06 | 2018-12-25 | 重庆三峡学院 | A kind of experimental provision of novel non-contact electromagnetism acoustic emission signal excitation |
| CN112284308A (en) * | 2019-07-24 | 2021-01-29 | 中国石油天然气股份有限公司 | Electromagnetic ultrasonic transverse wave thickness measuring probe |
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