CN107340334A - Damage detecting method in a kind of underwater foundation body - Google Patents
Damage detecting method in a kind of underwater foundation body Download PDFInfo
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- CN107340334A CN107340334A CN201710598558.8A CN201710598558A CN107340334A CN 107340334 A CN107340334 A CN 107340334A CN 201710598558 A CN201710598558 A CN 201710598558A CN 107340334 A CN107340334 A CN 107340334A
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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
- 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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- General Health & Medical Sciences (AREA)
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The present invention relates to damage detecting method in a kind of underwater foundation body.The present invention be by annular ultrasonic transducer array load on bridge pier, transducer in annular array is controlled to be scanned underwater foundation section by PC, to obtain the delay data between transmitting-receiving point, according to Fourier's Central slice theorem, imaging is carried out by algorithm to scanning cross-section to show, to judge degree of impairment.The present invention utilizes ultrasonic technology, carries out comprehensive scanning to underwater foundation, detects non-blind area, three-dimensional imaging result is accurately clear；Detecting system is built simply, and environmental suitability is strong, with more the distinctive feature for finding out bridge pier internal injury situation.
Description
Technical field
The invention belongs to technical field of nondestructive testing, more particularly, to damage detecting method in a kind of underwater foundation body.
Background technology
In general building is in ground environment, and conventional non-destructive testing technology can be to detect a flaw to building.But
With the continuous development of China's water conservancy construction, submerged structure is more and more, especially underwater foundation, is chronically in water, no
Washing away for high speed flowing water is subjected only to, under the effect such as various load or crustal stress, in addition to it can produce external damage, internal junction
Anomalous variation can also occur for structure, many potential safety hazards be present.Because underwater foundation local environment is special, light is weak, pressure is big etc.
Reason causes traditional detection technique to be difficult to detect.
In the past using the method manually felt, visually observed, obvious surface damage can only be found.Due to underwater visibility
Low, diver is touched by hand can not detect narrow and small and internal flaw, and the experience of diver or judgement all can be to results
Have an impact, more importantly the person has security risk；Using underwater television, underwater camera even underwater robot method,
Cost is high, longevity of service, is equally difficult to find internal injury, and generally requires cleaning checking matter surface before detection, works as water
Body is more muddy or when current are excessive, and testing result is also undesirable；Also underwater Magnetic testing technology or electromagnetic field detection technology
Deng, harsh is required to test condition, there is limitation, for example Magnetic testing needs to clear up measured object surface, until expression metal
Gloss, but bridge pier surface is substantially concrete structure, does not meet testing conditions.And existing sonar detection method, mostly can only
Body surface defect is detected, can not but detect inner case, potential safety hazard is still present.
The content of the invention
The present invention is in view of the shortcomings of the prior art, it is proposed that damage detecting method and system in a kind of underwater foundation body.Should
Detection method utilizes ultrasonic technology, carries out comprehensive scanning to underwater foundation, detects non-blind area, three-dimensional imaging result is accurately clear
It is clear；Detecting system is built simply, and environmental suitability is strong, with more the distinctive feature for finding out bridge pier internal injury situation.
The technical solution adopted for solving the technical problem of the present invention is：
The present invention is by annular ultrasonic transducer array load on bridge pier, by transducer in PC control annular array to water
Lower bridge pier section is scanned, and to obtain the delay data between transmitting-receiving point, according to Fourier's Central slice theorem, passes through calculation
Method carries out imaging to scanning cross-section and shown, to judge degree of impairment, is specifically：
Ultrasonic signal is launched by signal generator, by power amplifier, signal drives transmitting transducer work after being exaggerated
Make, the synchronizing signal of synchronous signal generator is connected to a passage of data collecting card, and PC stores its whole waveform；Reception is changed
Through preamplifier filter amplifying processing after energy device acquisition signal, then another passage of data collecting card is connected to, PC is equally deposited
Its whole waveform is stored up, the waveform carries the characteristic information of bridge pier.The time difference between above-mentioned two waveform is calculated, can must project number
According to.
The data for projection of acquisition is subjected to one-dimensional Fourier transform, obtains the signal on frequency domain；According to anxious in Fourier
Piece theorem, inverse transformation obtain original image；Barycenter is solved to the gray level image of original image, so that it is determined that defective locations；
After the scanning imagery for completing a certain section, next section can be scanned in the same way, and then to underwater foundation body
Three-dimensional imaging is carried out, internal structure is high-visible, so as to judge structural damage situation in bridge pier body.
Described data for projection obtains in the following ways：
Transmission signal is a sinusoidal filler pulse signal, using its trough as the starting point for calculating data for projection；Reception signal by
The scattering of sound wave has a great influence, and its first trough is only the trough of starting of oscillation signal.The maximum valley value of noise segment signal is taken to make
For threshold value, first trough point of reception signal is detected and is marked by PC, and data for projection is then between two troughs
Time difference.
The beneficial effects of the present invention are：
1. this method detects underwater foundation body, non-blind area, with reference to the data processing method of design, three-dimensional imaging result, water are formed
The internal structure situation of lower bridge pier is very clear, and this is that traditional detection means can only be detected less than body-surface rauma；
2. annular array scan method is used, it is not only easy to carry, be easily assembled to, and the full side for passing through circulating multicast
Bit scan, testing efficiency is high, precision is high；
3. imaging process takes short, structure in bridge pier body can be quickly shown in real time, is discovered with the presence or absence of defect；
4. detecting system is not easy to be limited by conditions such as water turbidity, low visibility, current, it is widely used, strong interference immunity；
5. data measured can carry out imaging output by the algorithm of design in real time, to damage reason location, quantitative analysis；And data can
To preserve for a long time, be advantageous to the review verification in later stage；
It is 6. low, safe to the human body harmless as transmission signal, cost using ultrasonic wave.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is the system schematic of the present invention；
Fig. 2 is annular ultrasound transducer array structural representation in the present invention；
In figure：At 2-1, fastening；2-2, underwater foundation；2-3, underwater foundation internal injury；2-4, ultrasonic transducer；
Fig. 3 is the circulating scanning schematic diagram of array in the present invention " multicast "；
In figure：1~n represents ultrasonic transducer, when 1 transducer transmission signal of sequence number, remaining transducer reception signal, by inverse
Hour hands rotation mode, change and make sequence number 2 and launch, remaining transducer receives, by that analogy；
Fig. 4 be in the present invention transmission signal to the time delay acquisition methods schematic diagram of reception signal；
In figure：4-1, transmission signal；4-2, transmission signal first trough；4-3, reception signal；The of 4-4, reception signal
One trough；
Fig. 5 is a certain section imaging and internal flaw barycenter schematic diagram in the present invention；
In figure：5-1, defect；5-2, defect barycenter；The a certain section imaging of 5-3, underwater foundation body.
Embodiment
Embodiment and accompanying drawing below in conjunction with the present invention are further retouched to the detection method and system of the present invention
State, so as to which beneficial effects of the present invention will be further appreciated.
It is as shown in Figure 1 system schematic.System is related to signal generator, power amplifier, preamplifier, data and adopted
Multiple hardware such as truck, PC, after building system, control peripheral hardware signal generator sends suitable pumping signal, signal
Frequency setting scope is 50k ~ 150k hertz, and this depends primarily on attenuation characteristic of the submerged structure body to ultrasonic signal.Due to
The system needs to provide a synchronizing signal to data collecting card, so to select that binary channels while the signal of signal can be sent
Generator, the system use U.S. Tyke signal source AFG3052C function signal generators；In order to avoid because of driving voltage amplitude
It is too small that transmitting transducer can not be encouraged to send signal, therefore pumping signal is added on model 800A3B power amplifier；Letter
Drive transmitting transducer work after number being exaggerated, the synchronizing signal of synchronous signal generator be connected to data collecting card one is logical
Road, PC store its whole waveform；The ultrasonic signal inspired passes through tested building body, by receive transducer reception and again
Into preamplifier, from model VP1C00 preamplifier, by it come amplified signal, signal to noise ratio is improved, simultaneously
Unwanted noise signal is filtered, and ensures that the signal after amplification both improves gain, but it is undistorted, it will finally obtain
Waveform transfer to data collecting card another passage.So that analysis and processing of the later stage to signal are facilitated, due to
In the presence of launching and receive two paths of signals, therefore model PCI-20612 multi-channel synchronous parallel high-speed data capture cards are selected, can be with
12Bit high-precision As/D conversions are carried out, 20MSps is can reach per passage highest sample rate, comply fully with actual acquisition requirement.
Annular ultrasound transducer array structural representation in system is illustrated in figure 2, it is mainly identical by two
Semicircular arrays, which merge, to be formed, and isogonism arranges 45 ultrasonic transducer 2-4 in each semi arch array, and result in formation of by 90
The annular supersonic array that individual ultrasonic transducer combines, during detection, by array snare on tested building body 2-2, and tightly
Place 2-1 is solidly connected, can so carry out damage check, so as to judge defect 2-3, the array structure to building body arbitrary section
Simply, it is easy to assembly, it can but be played with reference to PC and display is imaged to building body arbitrary section, analyze the powerful work(of degree of impairment
Energy.
Above-mentioned array can be controlled by PC, completed automatically scanning work, be illustrated in figure 3 circular array " multicast "
Circulating scanning schematic diagram, 1 ~ n of numbering are transducer sequence number, and n is 90 herein, and its working method is with step to some section
A length of 4 degree of 360 degree of rotation sweeps.First to control the transducer transmission signal of numbering 1, remaining 89 transducers are used as detailed process
Reception signal, by diagrammatically shown direction counterclockwise, then change and make the transducer transmission signal of numbering 2, be left 89 transducers and receive
Signal, circulate successively, until the last transducer transmission signal of numbering 90, remaining 89 receive.
After completing single pass, the time difference between sending and receiving waveform, i.e. data for projection are calculated by PC.Such as Fig. 4 institutes
It is shown as capturing the schematic diagram of delay data in system, because the oscillation starting points signal amplitude of reception is relatively low, is not easy to catch, so
Capture receives and launched the trough of both signals and then calculates projection value.Transmission signal 4-1 is a sinusoidal filler pulse signal,
Using its trough 4-2 as the starting point for calculating data for projection；Reception signal 4-3 is had a great influence by the scattering of sound wave, its first ripple
Paddy 4-4 is only the trough of starting of oscillation signal.Higher signal to noise ratio is wherein mainly utilized, takes the maximum valley value conduct of noise segment signal
Threshold value, first trough point of reception signal can be detected and are marked by PC, delay data then for two troughs it
Between difference, thus obtain on section it is all carry bridge pier characteristic informations data for projection.
Data for projection is obtained, scanning cross-section is imaged according to data below processing mode and exported：The first step, by acquisition
Data carry out one-dimensional Fourier transform, obtain the signal on frequency domain；Second step, according to Fourier's Central slice theorem, i.e. object
The two-dimensional Fourier transform of density function is equal to the one-dimensional Fourier transform for the data for projection for carrying object information, and inverse transformation obtains
Original image.The result of the first step is subjected to Fourier inversion in theory and can obtain original image, it is contemplated that ultrasonic
The propagation characteristic of ripple, the sound wave path by scattering object are complicated, therefore the image that need to be obtained to conversion carries out research processing；The
Three steps, it is zooming in or out in proportion although the size of defect and actually having deviation in the obtained gray level image of conversion,
Its relative position is constant, solves barycenter to its gray level image, then defective locations can determine；As shown in figure 5, it can send out
The defects of the existing a certain section imaging 5-3 of underwater foundation body 5-1 and its position 5-2.After the scanning imagery for completing a certain section, with
Same mode can scan next section, and by that analogy, all section imagings can construct bridge pier body 3 dimensional drawing,
Internal structure is high-visible, so as to judge structural damage situation in bridge pier body.
To sum up, after annular supersonic array is mainly loaded in underwater foundation body by the present invention, corresponding system is built, is passed through
PC controls the scanning work of supersonic array, then relies on algorithm to export structure imaging in bridge pier body, shows bridge simple and clearly
Structure situation in pier body, reach the effect of Non-Destructive Testing, evade the problems of conventional detection method.
Claims (2)
1. damage detecting method in a kind of underwater foundation body, be by annular ultrasonic transducer array load on bridge pier, pass through PC
Transducer is scanned to underwater foundation section in machine control annular array, to obtain the delay data between transmitting-receiving point, according to
According to Fourier's Central slice theorem, imaging is carried out to scanning cross-section by algorithm and shown, to judge degree of impairment, its feature exists
In：
Ultrasonic signal is launched by signal generator, by power amplifier, signal drives transmitting transducer work after being exaggerated
Make, the synchronizing signal of synchronous signal generator is connected to a passage of data collecting card, and PC stores its whole waveform；Reception is changed
Through preamplifier filter amplifying processing after energy device acquisition signal, then another passage of data collecting card is connected to, PC is equally deposited
Its whole waveform is stored up, the waveform carries the characteristic information of bridge pier, calculates the time difference between above-mentioned two waveform, can must project number
According to；
The data for projection of acquisition is subjected to one-dimensional Fourier transform, obtains the signal on frequency domain；Determine according to Fourier's center slice
Reason, inverse transformation obtain original image；Barycenter is solved to the gray level image of original image, so that it is determined that defective locations；
After the scanning imagery for completing a certain section, next section can be scanned in the same way, and then to underwater foundation body
Three-dimensional imaging is carried out, internal structure is high-visible, so as to judge structural damage situation in bridge pier body；
Described data for projection obtains in the following ways：
Transmission signal is a sinusoidal filler pulse signal, using its trough as the starting point for calculating data for projection；Reception signal by
The scattering of sound wave has a great influence, and its first trough is only the trough of starting of oscillation signal；The maximum valley value of noise segment signal is taken to make
For threshold value, first trough point of reception signal is detected and is marked by PC, and data for projection is then between two troughs
Time difference.
2. damage detecting method in a kind of underwater foundation body according to claim 1, it is characterised in that：
Described annular ultrasonic transducer array is formed by two semicircular arrays fastenings, and isogonism is arranged in each semicircular arrays
Some ultrasonic transducers are put, whole array can realize the scan round function of ultrasonic wave multicast.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710598558.8A CN107340334A (en) | 2017-07-21 | 2017-07-21 | Damage detecting method in a kind of underwater foundation body |
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| CN201710598558.8A CN107340334A (en) | 2017-07-21 | 2017-07-21 | Damage detecting method in a kind of underwater foundation body |
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Cited By (5)
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| CN108761469A (en) * | 2018-06-13 | 2018-11-06 | 中交基础设施养护集团有限公司 | A kind of detection method of the submerged structure damage and channel scour scanned based on sonar |
| CN110057915A (en) * | 2019-05-14 | 2019-07-26 | 黄河勘测规划设计研究院有限公司 | The underwater tunneling boring three-dimensional basic imaging detection method of canal engineering |
| CN112557500A (en) * | 2020-11-05 | 2021-03-26 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
| CN112630309A (en) * | 2020-12-09 | 2021-04-09 | 武汉大学 | Method for acquiring heterogeneous rock wave velocity field |
| CN114397362A (en) * | 2021-12-03 | 2022-04-26 | 中交四航工程研究院有限公司 | Automatic detection system and method for bridge pier cracks in frozen sea area |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761469A (en) * | 2018-06-13 | 2018-11-06 | 中交基础设施养护集团有限公司 | A kind of detection method of the submerged structure damage and channel scour scanned based on sonar |
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| CN110057915A (en) * | 2019-05-14 | 2019-07-26 | 黄河勘测规划设计研究院有限公司 | The underwater tunneling boring three-dimensional basic imaging detection method of canal engineering |
| CN110057915B (en) * | 2019-05-14 | 2021-08-17 | 黄河勘测规划设计研究院有限公司 | Underwater full-section three-dimensional foundation imaging detection method for channel engineering |
| CN112557500A (en) * | 2020-11-05 | 2021-03-26 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
| CN112557500B (en) * | 2020-11-05 | 2022-01-28 | 中国水利水电科学研究院 | Underwater elastic wave full wave field nondestructive detection system and method |
| CN112630309A (en) * | 2020-12-09 | 2021-04-09 | 武汉大学 | Method for acquiring heterogeneous rock wave velocity field |
| CN114397362A (en) * | 2021-12-03 | 2022-04-26 | 中交四航工程研究院有限公司 | Automatic detection system and method for bridge pier cracks in frozen sea area |
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Application publication date: 20171110 |