CN104132995A - Ultrasonic nondestructive testing method based on deconvolution technology - Google Patents
Ultrasonic nondestructive testing method based on deconvolution technology Download PDFInfo
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- CN104132995A CN104132995A CN201410365888.9A CN201410365888A CN104132995A CN 104132995 A CN104132995 A CN 104132995A CN 201410365888 A CN201410365888 A CN 201410365888A CN 104132995 A CN104132995 A CN 104132995A
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Abstract
The invention discloses a defect shape ultrasonic imaging method based on a deconvolution technology, and provides a nondestructive testing method having higher resolution ratio and stronger reliability. The nondestructive testing method comprises the steps: based on the deconvolution technology, carrying out pointwise processing and analysis on an echo signal, extracting depth information of surfaces of a defect, locating a defect position, and presenting a shape of the defect, so as to obtain internal structural information of a structural body. With utilization of a communication channel compensation characteristic capability of deconvolution, the method realizes defect location and defect imaging, can be used for nondestructive testing of concrete structural bodies, has high defect resolution ratio and high visibility, conveniently and intuitively understands the defect shape inside a corrugated pipe, screens out some defects with larger harm, facilitates to timely implement remedial measures to reduce the harm, is a precise, practical and economical nondestructive testing method, can effectively perform quality monitoring and maintenance on bridges or buildings and other structural bodies, and has a good application prospect.
Description
Technical field
The present invention relates to a kind of supersonic damage-free detection method based on deconvolution technology, belong to Ultrasonic Detection and analysis technical field.
Background technology
Corrugated tube is widely used in prestressed bridge girder construction, and corrugated tube slip casting mud jacking is extremely important operation, and corrugated tube slip casting mud jacking leakiness directly causes bridge, girder construction to lose usability, causes serious safety problem.In the last few years, ultrasonic non-destructive inspection techniques (NDT) was more and more is applied in the testing of xoncrete structure internal problem.
Some researchers, based on pulse echo method, can detect the crack in concrete by the time domain pulse echo signal that uses a kind of efficient simple device to obtain.Supersonic damage-free detection method based on Entropy of Instantaneous Frequency can be estimated the time-frequency position of defect in structure, and can also identify multiple defects; The degree of depth of utilizing R wave Spectral Analysis Method can detect semi-closure in large volume, stratiform concrete structure quality and definite structure or to be filled with the crack of water has degree of precision; The echoed signal that correlation method processing receives, can not only get rid of random disturbance effectively, can also retain the complete information of flaw indication simultaneously.
But in actual duct prestress corrugated tube squeezing quality detects, internal problem is defect or the cavity of irregular shape often, general signal processing method is obvious not to defect analysis feature, the phenomenons such as existence is failed to judge, erroneous judgement, detection efficiency is low, especially be difficult to location defect position, be more difficult to show for defect shape.
Summary of the invention
For solving the deficiencies in the prior art, the object of the invention is to break through defect shape and show this bottleneck, a kind of lossless detection method based on deconvolution technology is proposed, can accurately extract each surperficial degree of depth of defect, finally present the shape of defect, method is simply efficient, and reliability is high.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
Based on a supersonic damage-free detection method for deconvolution technology, comprise the steps:
S1, the transducer group that is made up of transmitting transducer and receiving transducer are with fixed intervals r
i, simultaneously along the end tangent plane of structure to be measured circumferentially every fixed range a, with the data message of one one type collection structure inside of receiving, until transducer group is got back to original position;
S2, by transducer group along structure axial direction translation distance S to be measured, then repeating step S1, gathering the distance of testing tangent plane last time apart from structure to be measured is the circumferential data message of tangent plane at S place;
S3, repeating step S2 repeatedly, until detect complete region to be measured;
S4, based on deconvolution algorithm, locate and extract each surperficial depth information x of defect
i;
S5, oppositely solve depth coordinate x by MATLAB
i, and demonstrate the defect information data that obtain with image, show the defect shape of structure to be measured.
Aforementioned transmitting transducer produces the high-frequency high-power ultrasonic pulsative signal through Hanning window FUNCTION MODULATION, and for detection of structure to be measured, described receiving transducer receives and is stored in computing machine echoed signal Y (t).
Aforementioned structure to be measured is concrete body, and there is corrugated tube inside.
In the present invention, X (t)=Y (t) ⊙ H (w), wherein, " ⊙ " represents deconvolution computing, X (t) is input flaw indication, and H (w) is flawless structure system response, and Y (t) is echoed signal.
In the present invention,
wherein, s (i) is the distance that ultrasound wave experiences to receiving transducer through defect reflection from transmitting transducer, and v is hyperacoustic velocity of wave in structure to be measured, and t (i) is the time of blemish surface reflection echo, x
ifor transmitting transducer A to be asked for is to the distance of defect point C, r
ifor transmitting transducer A is to the distance of receiving transducer B.
Afore-mentioned distance a and equate and be all less than fixed intervals r apart from S
i.
Usefulness of the present invention is: the squeezing quality that the present invention is directed to structure carries out Non-Destructive Testing, the lossless detection method that a kind of resolution is higher, reliability is stronger is proposed, based on deconvolution technology, echoed signal is carried out to pointwise processing analysis, extract each surperficial depth information of defect, orient defective locations, and present defect shape, thereby obtain the internal structural information of structure; Utilize the channel compensation performance capabilities of deconvolution, realize the location of defect and the imaging of defect, can be used in the Non-Destructive Testing as concrete body, defect resolution is high, visual strong, understand easily and intuitively the defect shape of bellows interior, investigate out the defect that some harmfulness are larger, facilitate timely enforcing remedies measure, harm reduction, be a kind of accurately, practical, economic lossless detection method, can be effectively rectangle to the tubulose such as bridge or building or cross section structure carries out quality monitoring and maintenance, have a good application prospect.
Brief description of the drawings
Fig. 1 is the structural representation of concrete body to be detected of the present invention;
Fig. 2 is the schematic diagram of transducer group of the present invention along the circumferential displacement of structure to be measured;
Fig. 3 is the schematic diagram of transducer group of the present invention along structure axial displacement to be measured;
Fig. 4 is the example waveform figure of the deconvolution principle in method of the present invention;
Fig. 5 is the schematic diagram that method of the present invention is extracted the blemish surface degree of depth (tangent plane visual angle);
Fig. 6 is the schematic diagram that method of the present invention is extracted the blemish surface degree of depth (axially visual angle).
The implication of Reference numeral in figure: 1, steel strand wires, 2, grout, 3, corrugated tube, 4, concrete, 5, transmitting transducer, 6, receiving transducer, 7, defect.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to concrete introduction.
As shown in Figure 1, the structure to be measured cross section of the present embodiment is rectangle, is made up of concrete 4, and inside is embedded with corrugated tube 3, and corrugated tube 3 centers have steel strand wires 1 vertically, between steel strand wires 1 and corrugated tube 3, water and are shaped with grout 2.Detection method of the present invention is the high reliability method that is specially adapted to the squeezing quality of structure to carry out Non-Destructive Testing, specifically comprises the steps:
S1, the transducer group that is made up of transmitting transducer 5 and receiving transducer 6 are with fixed intervals r
i, simultaneously along the end tangent plane of structure to be measured circumferentially every fixed range a, with the data message of one one type collection structure inside of receiving, as shown in Figure 2, test circumferential multiple points, until transducer group is got back to original position; The high-frequency high-power ultrasonic pulsative signal that transmitting transducer 5 produces through Hanning window FUNCTION MODULATION, for detection of structure to be measured, receiving transducer 6 receives and is stored in computing machine echoed signal Y (t);
S2, by transducer group along structure axial direction translation distance S to be measured, then repeating step S1, gathering the distance of testing tangent plane last time apart from structure to be measured is the circumferential data message of tangent plane at S place;
S3, repeating step S2, until detect complete region to be measured;
S4, based on deconvolution algorithm, locate and extract defect 7 each surperficial depth information x
i;
S5, oppositely solve depth coordinate x by MATLAB
i, and demonstrate defect 7 information datas that obtain with image, show defect 7 shapes of structure to be measured.
Preferred as one, equate and be all less than fixed intervals r apart from a with apart from S
i, can utilize like this channel compensation performance capabilities of deconvolution, improve defect 7 resolution.
In order to understand better the present invention, below testing process and principle are described in detail:
Shown in Fig. 1 is concrete 4 structures to be detected, and there is corrugated tube 3 inside, shown in Fig. 2 and Fig. 3 is respectively the schematic diagram of from different perspectives concrete 4 structures being tested, wherein, shown in Fig. 2 is that transducer group is around concrete 4 structure circumferential direction rotations and with debit's formula image data, direction shown in arrow is the motion path of transducer group, after the data for the treatment of a week all gather, transducer group is along axial direction (direction shown in arrow in Fig. 3) the translation certain distance S of the corrugated tube 3 shown in Fig. 3, then transducer group gathers the data message apart from end distance as the circumferential direction of concrete 4 structures at S place in the mode shown in Fig. 2 again, so repeatedly, until detect complete concrete 4 structures.
The present invention has utilized following deconvolution principle: in concrete 4 structure systems, the echoed signal of defect 7 scatterings has not only comprised the characteristic information of defect 7 scattering processes, also relevant with dielectric properties such as transducer, corrugated tube 3, steel strand wires 1, grouts 2, be directly difficult to pass judgment on defect 7 features from echoed signal.If the structure of zero defect 7 is considered as to a system responses H (w), for the concrete 4 structure systems that have defect 7, its echoed signal is defined as to Y (t), so:
Y(t)＝X(t)*H(w) (1)
Wherein, " * " represents convolution algorithm, and X (t) is input defect 7 signals, and H (w) is the structure system response of zero defect 7.
Deconvolution computing is a kind of mode that input signal is asked in known output, also can regard a kind of compensation characteristic of channel as.In actual measurement process, we can obtain the structure system response H (w) of echoed signal Y (t) and zero defect 7, and the computing of definition deconvolution is " ⊙ ", and defect 7 signals can obtain by following formula so:
X(t)＝Y(t)⊙H(w) (2)
Defect 7 echoed signals are carried out to deconvolution computing, remove the impact of other factors, extract defect 7 scattering signatures, can obtain better defect 7 characteristic informations.
Shown in Fig. 4 is the example exemplary waveforms figure of a deconvolution, can obtain the Induction Peried t (i) of defect 7 signal X (t) from deconvolution result, t (i) corresponding the time of defect 7 surface reflection echoes.Detect for specific material, hyperacoustic velocity of wave is certain, is made as v, can obtain so the distance s (i) of ultrasound wave experience,
s(i)＝vt(i) (3)
As shown in Figure 5 be that the present invention extracts defect 7 case depth schematic diagrams, establishing ultrasound wave, to reflex to through defects 7 distance that receiving transducer 6 experiences from transmitting transducer 5 be s (i), so
Wherein, x
ifor transmitting transducer 5A is to the distance of 7 C of defect, r
ifor transmitting transducer 5A is to the distance of receiving transducer 6B.
Can be obtained by formula (3) formula (4):
In formula (5) except x
ibeyond the unknown, all the other are all known, therefore can solve x by formula (5)
i, 7 C of defect are apart from detecting surperficial depth distance.
Shown in Fig. 6 is each case depth information principle figure that the present invention obtains defect 7, and can obtain certain scanning by (5) formula time, 7 C of defect are apart from detecting surperficial depth distance.
Rotate one week in Fig. 2 mode, so just can obtain defect 7 select C on this tangent plane case depth information of one week, with the translation of Fig. 3 mode, until whole testing process finishes, just can obtain all case depth information of 7 C of this defect again, to reach the object of defect 7 imagings, test, until complete the detection to total body, just can obtain defect 7 information of structure inside and orient defect 7 positions and defect 7 shapes and so forth, visual strong, resolution is high.
More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (6)
1. the supersonic damage-free detection method based on deconvolution technology, is characterized in that, comprises the steps:
S1, the transducer group that is made up of transmitting transducer and receiving transducer are with fixed intervals r
i, simultaneously along the end tangent plane of structure to be measured circumferentially every fixed range a, with the data message of one one type collection structure inside of receiving, until transducer group is got back to original position;
S2, by transducer group along structure axial direction translation distance S to be measured, then repeating step S1, gathering the distance of testing tangent plane last time apart from structure to be measured is the circumferential data message of tangent plane at S place;
S3, repeating step S2 repeatedly, until detect complete region to be measured;
S4, based on deconvolution algorithm, locate and extract each surperficial depth information x of defect
i;
S5, oppositely solve depth coordinate x by MATLAB
i, and demonstrate the defect information data that obtain with image, show the defect shape of structure to be measured.
2. a kind of supersonic damage-free detection method based on deconvolution technology according to claim 1, it is characterized in that, described transmitting transducer produces the high-frequency high-power ultrasonic pulsative signal through Hanning window FUNCTION MODULATION, for detection of structure to be measured, described receiving transducer receives and is stored in computing machine echoed signal Y (t).
3. a kind of supersonic damage-free detection method based on deconvolution technology according to claim 1 and 2, is characterized in that, described structure to be measured is concrete body, and there is corrugated tube inside.
4. a kind of supersonic damage-free detection method based on deconvolution technology according to claim 3, it is characterized in that, X (t)=Y (t) ⊙ H (w), wherein, " ⊙ " represents deconvolution computing, X (t) is input flaw indication, and H (w) is flawless structure system response, and Y (t) is echoed signal.
5. a kind of supersonic damage-free detection method based on deconvolution technology according to claim 4, is characterized in that,
wherein, s (i) is the distance that ultrasound wave experiences to receiving transducer through defect reflection from transmitting transducer, and v is hyperacoustic velocity of wave in structure to be measured, and t (i) is the time of blemish surface reflection echo, x
ifor transmitting transducer A to be asked for is to the distance of defect point C, r
ifor transmitting transducer A is to the distance of receiving transducer B.
6. a kind of supersonic damage-free detection method based on deconvolution technology according to claim 1, is characterized in that, describedly equates and is all less than fixed intervals r apart from a with apart from S
i.
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| CN105510435A (en) * | 2015-11-27 | 2016-04-20 | 航天晨光股份有限公司 | Method for detecting defects of metal bellows based on laser vibration |
| CN107281687A (en) * | 2017-08-22 | 2017-10-24 | 河海大学常州校区 | A kind of fire hydrant aqueous condition detection method |
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Application publication date: 20141105 |