CN106959340A - The sound wave modulating equipment and method of a kind of utilization electromagnetic exciter - Google Patents
The sound wave modulating equipment and method of a kind of utilization electromagnetic exciter Download PDFInfo
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- CN106959340A CN106959340A CN201710153716.9A CN201710153716A CN106959340A CN 106959340 A CN106959340 A CN 106959340A CN 201710153716 A CN201710153716 A CN 201710153716A CN 106959340 A CN106959340 A CN 106959340A
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- signal
- electromagnetic exciter
- concrete
- low frequency
- fixation means
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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
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
- G01N29/346—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with amplitude characteristics, e.g. modulated signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The present invention relates to a kind of sound wave modulating equipment of utilization electromagnetic exciter and method, the equipment is mainly made up of three parts：Ultrasonic testing system；Fixation means；And signal processing system；Ultrasonic testing system is by HF signal generator, low frequency generator, electromagnetic exciter, transmitting transducer, receive transducer, two signal amplifiers and oscillograph composition；Fixation means are specifically a metallic support, for fixing concrete test specimen, and connection electromagnetic exciter and its probe；Signal processing system includes memory and portable computer；Memory is used to store the ultrasonic signal that signal processor is obtained, and portable computer is handled the signal of reception by existing program.The inventive method is the new method in concrete nondestructive testing field, and the extension to the microcrack of inside concrete and damage is sensitive, can be quick, efficient and accurate must reach structure and the Non-Destructive Testing demand of component.
Description
Technical field
The present invention relates to a kind of sound wave modulating equipment of utilization electromagnetic exciter and method, belong to forward position sound wave modulation technique
Field, i.e., by the use of electromagnetic exciter as low frequency signal emission source is stablized, while launching high-frequency signal, in tested geodesic structure and structure
The fault location of part produces wave beam aliasing modulation harmonic wave occur, utilizes the relation table between harmonic wave and high frequency and low frequency signal amplitude
Levy lesion size.The low frequency signal that electromagnetic exciter occurs is stable and without human factor influence, is damaged while modulating harmonic wave to small
Wound is sensitive, thus quickly, it is efficient and accurate must reach structure and the Non-Destructive Testing demand of component.
Background technology
Ripple when conventional linear ultrasound detection mainly runs into defect and the damage of medium using ultrasonic wave in communication process
Reflection and scattering etc. feature be analyzed and evaluated, main Testing index have the amplitude of ripple, reflection echo transit time difference and
Velocity of sound etc., essence is to reflect defect and the acoustic impedance and other peripheral region Jie qualitative differences of damage field.And the present invention is used
Sound wave modulation technique then using material itself is non-linear and nonlinear distortion of the sound wave in communication process at dielectric damages come
Evaluated and analyzed, it is sensitive to microlesion in this approach and have anticipation to the evolution of damage.
In structure and the detection process of component, traditional supersonic detection method is affected by the surrounding environment larger, it is impossible to
Reach the purpose precisely detected, such as ultrasonic limited amplitude method, it needs to be tested using the higher through transmission technique of test requirements document,
And need reduce instrument it is non-linear on do many work, with certain limitation.
The content of the invention
The technical problem to be solved in the present invention：
To solve conventional ultrasound Dynamic Non-Destruction Measurement when detecting inside concrete degradation the problems such as sensitivity deficiency,
The present invention proposes the sound wave modulating equipment and method of a kind of utilization electromagnetic exciter.The sound wave modulation technique that the present invention is used is
The characteristics of being interacted after being met based on two train waves at material internal defect, experimental study shows, the technology is mixed in detection
Coagulate and produce the low of stabilization with very high feasibility and sensitivity, and using electromagnetic exciter on degradation inside soil material
Frequency signal, avoids the uncertainty for tapping cause manually well.
The present invention solves its technical problem and is achieved through the following technical solutions：
A kind of sound wave modulating equipment of utilization electromagnetic exciter of the present invention is mainly made up of three parts：Ultrasonic testing system；
Fixation means；And signal processing system.
Wherein, ultrasonic testing system is by HF signal generator, and low frequency generator, electromagnetic exciter launches transducing
Device, receive transducer, two signal amplifiers and oscillograph composition, low frequency generator by a signal amplifier with
Electromagnetic exciter is connected, and HF signal generator is connect by the incoming transmitting transducer of another signal amplifier, receive transducer
Incoming oscillograph after the collection of letters number, oscillograph is finally connected with signal processing system.
Wherein, fixation means are specifically a metallic support, for fixing concrete test specimen, and connection electromagnetic exciter
And its probe.
Wherein, signal processing system includes memory and portable computer.Memory is obtained for storing signal processor
The ultrasonic signal arrived, portable computer is handled the signal of reception by existing program.
A kind of sound wave modulator approach of utilization electromagnetic exciter, comprises the following steps：
1. fixing ultrasonic testing system and sample, fixation by fixation means, sample is set to keep abswolute level.
2. produce continuous high frequency sinusoidal signal by HF signal generator, by coupled signal amplifier and
The transmitting transducer of concrete test block one end sends signal.
3. low frequency generator also produces continuous Low Frequency Sine Signals simultaneously, pass through coupled signal amplifier
Electromagnetic exciter is passed to, keeps electromagnetic exciter closely to be linked together by fixation means with probe and test specimen.
4. install a receive transducer in the other end of concrete sample.Receive transducer and transmitting transducer pass through
Couplant is closely connected with concrete.
5. modulating wave is got off by oscillograph recording, and it is stored in holder and waits subsequent treatment.
The present invention key technical feature be：
1. low frequency signal drives probe to produce by electromagnetic exciter, it is to avoid produce the not true of low frequency signal by artificial tap
It is qualitative.
2. the processing of non-linear ultrasonic numerical signal.The characteristics of non-linear ultrasonic signal, shows as dividing again for power spectral energies
Cloth to signal in frequency domain, it is necessary to carry out Accurate Analysis.Because nonlinear properties are weak, easily flooded by noise, the present invention is non-
In the processing procedure of linear ultrasonic numerical signal, the precision of ultrasonic signal spectrum analysis can be improved, accurate data are obtained.
3. using nonlinear acoustics principle detection concrete, relative to traditional concrete NDT technology and limited amplitude
Method, SATT method etc., the degradation of detection inside concrete that can be more accurate.
Beneficial effects of the present invention：
The inventive method is the new method in concrete nondestructive testing field, the expansion of microcrack and damage to inside concrete
Exhibition is sensitive, can be quick, efficient and accurate must reach structure and the Non-Destructive Testing demand of component.
Brief description of the drawings
Fig. 1 concrete nondestructive testings device model and signal transduction process.
The typical temporal figure of Fig. 2 modulated signals.
The frequency domain figure of Fig. 3 modulated signals.
Specific label is as follows in figure：
1. HF signal generator, 2. low frequency generators, 3. signal amplifiers, 4. signal amplifiers, 5. transmittings are changed
Can device, 6. electromagnetic exciters, 7. fixed supports, 8. receive transducers, 9. oscillographs.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of sound wave modulating equipment of utilization electromagnetic exciter of the invention is mainly made up of three parts：Ultrasound
Detecting system；Fixation means；And signal processing system.
Wherein, ultrasonic testing system is by HF signal generator 1, low frequency generator 2, electromagnetic exciter 6, and transmitting is changed
Energy device 5, receive transducer 8, two signal amplifiers 3,4 and oscillograph 9 are constituted, and low frequency generator 2 passes through a letter
Number amplifier 4 is connected with electromagnetic exciter 6, and HF signal generator 1 passes through another incoming transmitting transducer of signal amplifier 3
5, receive transducer 8 receives incoming oscillograph 9 after signal, and oscillograph 9 is finally connected (Fig. 1) with signal processing system.
Wherein, fixation means are specifically the fixed support 7 of a metal, for fixing concrete test specimen, and connection electricity
Magnet exciter and its probe.
Wherein, signal processing system includes memory and portable computer.Memory is obtained for storing signal processor
The ultrasonic signal arrived, portable computer is handled the signal of reception by existing program.
A kind of sound wave modulator approach of utilization electromagnetic exciter, comprises the following steps：
1. fixing ultrasonic testing system and sample, fixation by fixation means, sample is set to keep abswolute level.
2. produce continuous high frequency sinusoidal signal by HF signal generator, by coupled signal amplifier and
The transmitting transducer of concrete test block one end sends signal.
3. low frequency generator also produces continuous Low Frequency Sine Signals simultaneously, pass through coupled signal amplifier
Electromagnetic exciter is passed to, keeps electromagnetic exciter closely to be linked together by fixation means with probe and test specimen.
4. install a receive transducer in the other end of concrete sample.Receive transducer and transmitting transducer pass through
Couplant is closely connected with concrete.
5. modulating wave is got off by oscillograph recording, and it is stored in holder and waits subsequent treatment.
The principle of the present invention：The present invention be for the Underwater Acoustic channels of reception it is theoretical based on non-linear ultrasonic, it is and traditional
Ultrasonic detecting technology has significantly different, the amplitude mainly by measuring the ultrasonic wave modulation harmonic wave by concrete material
Change, to characterize degradation inside concrete structure.
For linear medium (such as zero defect sample), when two train waves are propagated and met wherein, a train wave is to another row
The propagation of ripple is not had an effect, after two train waves meet, and respective frequency is constant, and amplitude meets linear superposition theorem；If having in medium
Discontinuously, that is, there is nonlinear area, then two train waves will interact after being met in the region, and its amplitude is not inconsistent linear
Principle of stacking, produces " coupling terms " of two train waves, that is, modulates harmonic wave.It can observe that new composition is produced in a frequency domain, this is just
It is wave beam aliasing.
It is theoretical according to existing nonlinear acoustics, it is assumed that using a sine wave as high frequency wave beam, frequency is f1, amplitude is A1,
Using its phase angle as zero as reference,
Its waveform is：C (τ)=A1sin(f1τ),
Assume simultaneously using a sine wave as low frequency wave beam, frequency is f2, amplitude is A2, ginseng is used as using its phase angle as zero
According to
Low frequency signal waveform is：C (τ)=A2sin(f2τ)
Due to two beam ultrasonic signals, (higher frequency is f1, Frequency is f2) tune is generated at defect in concrete
Make (Fig. 2), modulation harmonic wave (Fig. 3) is generated in a frequency domain, frequency is (f1+f2) or (f1-f2).The displacement of modulated signal can be with
It is expressed as：
U (x, t)=A1cos(2πf1τ)+A2cos(2πf2τ)+Ascos[2π(f1-f2)τ]+Ascos[2π(f1+f2)τ]
In formula, u is displacement, and x is the propagation distance of sound wave, and t is the time, and τ=t-x/c, c is velocity of wave, f1, f2Not to be high
The frequency of low frequency signal, AsFor the amplitude of side frequency, A1, A2The respectively amplitude of low-and high-frequency signal.
The relative magnitude that we define side frequency is nonlinear factor, to characterize degradation inside concrete structure.
By formula it can be seen that, when we can obtain the amplitude of side frequency amplitude and low-and high-frequency signal simultaneously, you can calculate
To the nonlinear factor for characterizing concrete deterioration degree, this is the theoretical foundation of the present invention.
The signal being stored in oscillograph is handled on the basis of above-mentioned theory：The ultrasonic signal of reception carries out time domain
Turn the FFT processing of frequency domain, frequency domain is analyzed, the amplitude components A of harmonic wave is obtaineds.The width of low-and high-frequency signal known to again
Value A1With A2, it is the nonlinear parameter β that can obtain characterizing concrete damage by above-mentioned principle.
Claims (2)
1. a kind of sound wave modulating equipment of utilization electromagnetic exciter, it is characterised in that：The equipment is mainly made up of three parts：Ultrasound
Detecting system；Fixation means；And signal processing system；
Ultrasonic testing system is changed by HF signal generator, low frequency generator, electromagnetic exciter, transmitting transducer, reception
Energy device, two signal amplifiers and oscillograph composition, low frequency generator pass through a signal amplifier and electromagnetic exciting
Device is connected, and HF signal generator is received after signal by the incoming transmitting transducer of another signal amplifier, receive transducer
Incoming oscillograph, oscillograph is finally connected with signal processing system；
Fixation means are specifically a metallic support, for fixing concrete test specimen, and connection electromagnetic exciter and its probe；
Signal processing system includes memory and portable computer；Memory is used to store the ultrasound letter that signal processor is obtained
Number, portable computer is handled the signal of reception by existing program.
2. a kind of equipment as claimed in claim 1 carries out sound wave modulator approach, comprise the following steps：
1) ultrasonic testing system and sample, fixation are fixed by fixation means, sample is kept abswolute level；
2) continuous high frequency sinusoidal signal is produced by HF signal generator, passes through coupled signal amplifier and coagulation
The transmitting transducer of native test block one end sends signal；
3) while low frequency generator also produces continuous Low Frequency Sine Signals, passed to by coupled signal amplifier
Electromagnetic exciter, keeps electromagnetic exciter closely to be linked together by fixation means with probe and test specimen；
4) receive transducer is installed in the other end of concrete sample；Receive transducer and transmitting transducer pass through coupling
Agent is closely connected with concrete；
5) modulating wave is got off by oscillograph recording, and is stored in holder and is waited subsequent treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710153716.9A CN106959340A (en) | 2017-03-15 | 2017-03-15 | The sound wave modulating equipment and method of a kind of utilization electromagnetic exciter |
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| CN201710153716.9A CN106959340A (en) | 2017-03-15 | 2017-03-15 | The sound wave modulating equipment and method of a kind of utilization electromagnetic exciter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406635A (en) * | 2018-11-08 | 2019-03-01 | 航天科工防御技术研究试验中心 | Chatter modulation imaging detection method and system based on Air Coupling ultrasound |
| CN111059479A (en) * | 2019-12-28 | 2020-04-24 | 北京工业大学 | Pipeline defect phonon diagnosis system and implementation method |
| CN112098524A (en) * | 2020-09-22 | 2020-12-18 | 北京航空航天大学 | Method for identifying asphalt concrete fracture process and quantifying microcracks based on acoustic emission |
| CN113176334A (en) * | 2021-04-23 | 2021-07-27 | 重庆大学 | Ultrasonic nondestructive testing system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102087247A (en) * | 2010-11-04 | 2011-06-08 | 中山市创先宝艺珠宝有限公司 | Device and method for identifying gems |
| CN105353043A (en) * | 2015-10-28 | 2016-02-24 | 中国计量学院 | Sheet metal micro-crack time reversal positioning method based on abaqus |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406635A (en) * | 2018-11-08 | 2019-03-01 | 航天科工防御技术研究试验中心 | Chatter modulation imaging detection method and system based on Air Coupling ultrasound |
| CN111059479A (en) * | 2019-12-28 | 2020-04-24 | 北京工业大学 | Pipeline defect phonon diagnosis system and implementation method |
| CN111059479B (en) * | 2019-12-28 | 2021-11-12 | 北京工业大学 | Pipeline defect phonon diagnosis system and implementation method |
| CN112098524A (en) * | 2020-09-22 | 2020-12-18 | 北京航空航天大学 | Method for identifying asphalt concrete fracture process and quantifying microcracks based on acoustic emission |
| CN112098524B (en) * | 2020-09-22 | 2021-08-20 | 北京航空航天大学 | Method for identifying asphalt concrete fracture process and quantifying microcracks based on acoustic emission |
| CN113176334A (en) * | 2021-04-23 | 2021-07-27 | 重庆大学 | Ultrasonic nondestructive testing system and method |
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Application publication date: 20170718 |