CN103604868B - Based on corrugated tube squeezing quality pick-up unit and the method for synthetic aperture and information entropy - Google Patents
Based on corrugated tube squeezing quality pick-up unit and the method for synthetic aperture and information entropy Download PDFInfo
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Abstract
The invention discloses a kind of corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy and method, echo information is processed, thus obtain concrete inner structure, synthetic aperture imaging method is utilized to carry out dynamic focusing process to received ultrasound echo signal, combining information entropy algorithm processes containing flaw echo, extract defect information, judge defect, rebuild defect image, the information such as the defect of xoncrete structure inside are extracted better under surroundings, more effectively quality monitoring and maintenance are carried out to the xoncrete structure such as bridge or building, reliability is high, be conducive to actual popularization and use.
Description
Technical field
The invention discloses a kind of for the prestressed corrugated tube squeezing quality ultrasonic no damage detection device based on synthetic aperture and information entropy of xoncrete structure and method, belong to Ultrasonic Detection and analysis technical field.
Background technology
In recent years, the bridge collapse accident of China occurs again and again, improve the concrete structure quality detection technology such as bridge, carrying out safety assessment to the construction project that may there is potential safety hazard is an imperative job, be wherein one of emphasis about the detection of prestressed pore passage corrugated tube squeezing quality in bridge beam slab, whether mud jacking is closely knit will directly affect bulk strength and the permanance of prestressed component.
The detection of traditional squeezing quality, the main pulp situation by slurries in management field observation slip casting process, differentiate whether this hole squeezing quality meets the requirements with this, there is very large subjectivity random, moreover the mobility status of slurries in hole is by the factor controlling such as constructing operation, mud jacking pressure, supervisor is difficult to differentiate the full and consolidation situation of slurries in hole.As sampling Detection, can adopt unbearable detection method, by drill hole sampling, check inner defect, the method is simple and practical, but has destructiveness, not too applicable for the structure of having built; Employing elastic wave method is solved, and by the route of transmission of elastic wave, to elasticity wave amplitude, frequency, the isoparametric understanding of wave amplitude has identified zero defect, but the multi-solution of elastic waveform stereoscopic allows people be difficult to judge, effect is also not obvious.In addition grouted aggregate concrete material is a kind of heterogeneous structure material being made up of heterogeneous compound system grout, hole, deformed bar and corrugated tube etc., each phase weave in randomly, form very complicated inner structure, again heterogeneous condensed matter and the heterogeneous material with bullet, sticky, plasticity, to its carry out fast without damage testing also with regard to more complicated.Nowadays, Dynamic Non-Destruction Measurement is more ripe, and common Dynamic Non-Destruction Measurement has:
(1) radiographic examination (complete) method: radial energy penetrates the material that naked eyes cannot penetrate and makes light reaching the film, when X ray or r radiation exposure film, the same with ordinary ray, the silver halide in film emulsion layer can be made to produce latent image, because the material of different densities is different to the absorption coefficient of ray, be irradiated to film ray energy everywhere and also will produce difference, just can according to the egative film after darkroom disposal everywhere density difference differentiate defect.But overall cost is relatively high, and ray is harmful, inspection speed can be slower;
(2) Magnetic testing: after ferrimagnet and workpiece are magnetized, due to the existence of uncontinuity, the magnetic line of force on surface of the work and nearly surface is made local distortion to occur and produce stray field, absorption is applied to the magnetic of surface of the work, be formed in appropriate light according to lower visual visible magnetic trace, thus demonstrate the position of uncontinuity, shape and size.But the shape and size of workpiece have impact to detection sometimes, cannot detect because it is difficult to magnetization;
(3) Liquid Penetrant method: piece surface is by after the bleeding agent that applies containing fluorescent dye or illuminating colour, and under capillarity, through after a while, penetrating fluid can penetrate in Surface-breaking defect; After removing the unnecessary penetrating fluid of piece surface, developer is applied again at piece surface, equally, under the effect of kapillary, developer will attract the penetrating fluid retained in defect, and penetrating fluid bleeds back in developer, under certain light source, the penetrating fluid vestige of fault location is real, thus detects pattern and the distribution of defect.But Liquid penetrant testing can only detect Surface-breaking defect, but cannot detect inner defect or closo surface imperfection, and it is many to detect operation, the more expensive cost of the slow material of speed is higher, and some material is inflammable poisonous;
(4) ultrasonic method: utilize transducer that high frequency electric pulse is converted to high-frequency ultrasonic, ultrasound wave imports workpiece into by couplant, ultrasound wave can reflect when running into heterogeneous interface in communication process, reflect and waveform transformation, the sound wave reflected again by couplant popped one's head in reception, amplify after in fluorescence screen display, whether judge the equivalent size in defect reflection face according to echo height according to reflection echo position judgment.But cannot obtain defect visual image, qualitative difficulty, quantitative accuracy is not high, and, detect that rate is very low at the detection crackle class planar defect parallel with acoustic beam, easily undetected.
We know, xoncrete structure is a kind of heterogeneous body, porous, composition complex structure, dispersed anisotropic composite material greatly, and xoncrete structure is (as dam, bridge) bulky, complex structure, therefore, the nondestructiving detecting means of tradition machinery industry just seems helpless, when sound wave is propagated in concrete, as met the inherent vices such as caking cavity, will by these structural scatterings, produce the echoed signal with the acoustic characteristic information of internal structure of body, gather and process these echoed signals, concrete internal structural information can be obtained.But, the characteristic of concrete itself, make high frequency band decay wherein larger, and the directive property that ripple is propagated in concrete is also poor, simultaneously, can with the impact of random noise in routine testing, so the accuracy that current pick-up unit and method detect and precision, also all cannot reach engine request, often occur failing to judge, judging by accident in actual measurement.
Summary of the invention
Object of the present invention overcomes deficiency of the prior art, the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy provided and method be accurately, practical, economic Non-Destructive Testing, the information such as the defect of xoncrete structure inside can be extracted better, more effectively quality monitoring and maintenance are carried out to the xoncrete structure such as bridge or building, reliability is high, is conducive to actual popularization and use.
In order to achieve the above object, the technical solution adopted in the present invention is:
Based on a corrugated tube squeezing quality pick-up unit for synthetic aperture and information entropy, it is characterized in that: comprise
Signal stimulating module, for generation of highpowerpulse signal source;
Signal launching and receiving module, for launching ultrasonic testing signals and receiving echoed signal;
Signal acquiring and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal launching and receiving module to echoed signal sample, quantize and storage;
Judge and display module, based on information entropy algorithm, under noise background, extract the feature of flaw indication, show testing result, judge defect;
Described signal stimulating module is connected with signal launching and receiving module, and described signal launching and receiving module is connected with display module with judgement by Signal acquiring and processing module.
The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: described signal transmitting and receiving module comprises transmitting transducer primitive, receiving transducer array, square scanning element and screw mandrel slide unit, described transmitting transducer primitive is connected with signal stimulating module, described receiving transducer array is connected with Signal acquiring and processing module, described transmitting transducer primitive, receiving transducer array is connected with square scanning element jointly, described square scanning element is arranged on screw mandrel slide unit, described square scanning element scans detected concrete structure.
The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, is characterized in that: described transmitting transducer primitive is for launching ultrasound detection signal, and the ceramic transmitting transducer for matching with the signal source in signal stimulating module.
The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: described receiving transducer array is four receiving transducers matched with transmitting transducer, each receiving transducer equally linear array, be placed in four summits that square sweeps scanning element, for receiving echoed signal, and send to Signal acquiring and processing module.
The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: described Signal acquiring and processing module comprises the operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit that connect successively, and described synthetic aperture algorithm unit comprises the matched filtering circuit, delay circuit and the terminal that connect successively.
The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: described judgement and display module comprise the information entropy algorithm identifying unit and display unit that are connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information from each receiving transducer Received signal strength, comprises Time-frequency Filter module, information entropy algoritic module and threshold determination; Described display unit image demonstrates the defect information data obtained, and whether the defect showing detected concrete structure exists, defective locations and defect shape.
Operate in the detection method of the aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: comprise the following steps,
Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive, produces the ultrasonic testing signals for detecting detected concrete structure;
Step (2) receiving transducer array receives echoed signal;
Step (3) Signal acquiring and processing module is sampled to the echoed signal that reception transducer array receives, is quantized and stores processor;
Step (4) drives square scanning element by screw mandrel slide unit, adopts the mode of stepping linearly to move with fixing speed, repeats step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;
Step (5) Signal acquiring and processing module adopts synthetic aperture focusing to process the echoed signal collected, and result is outputted to judgement and display module;
Step (6) judges to judge with the data of display module to echoed signal, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data obtained, whether the defect showing detected concrete structure exists, defective locations and defect shape.
The aforesaid corrugated tube squeezing quality detection method based on synthetic aperture and information entropy, it is characterized in that: step (5) Signal acquiring and processing module adopts synthetic aperture focusing to be employing multicast pattern to the method that the echoed signal collected processes, realize dynamic focusing imaging, determine the shape information function of defect point, specific as follows
(1) defect point P is set to the distance of transmitting transducer primitive as r
1m, defect point P is r to the distance of receiving transducer array
2mthen,
Wherein, R is the vertical range of defect point P to transmitting transducer primitive place plane; d
1m, d
2mfor the horizontal vertical range of transmitting transducer primitive, receiving transducer array defect point P;
(2) along curve the reflection echo of defect point P on each aperture superposition summation also on average, the shape of defect point P will highlight, thus realizes the focusing at defect point P, in m echoed signal, the moment of the echoed signal arrival receiving transducer array of defect point P is
Wherein, c is the bulk sound velocity that sound wave is propagated in testee, the superposition of each echoed signal of defect point P is averaged again, obtains the shape information function s of the defect point P after focusing on
r(t),
Wherein, s (t-t
m) representing the echo receiving defect point P in m echoed signal, M is echoed signal number.
The aforesaid corrugated tube squeezing quality detection method based on synthetic aperture and information entropy, is characterized in that: step (6) decision process is based on frequency entropy algorithm, and the method extracting the defect information of echoed signal is,
(1) according to the flaw echo model that the echoed signal received is set up, described flaw echo model is the shape information function s of the defect point P after focusing on
rt (), tries to achieve its frequency-domain function s by Fourier transform
r(ω);
(2) defects detection is carried out according to echoed signal in the difference of the frequency entropy with or without fault location.
The aforesaid corrugated tube squeezing quality detection method based on synthetic aperture and information entropy, it is characterized in that: (2) carry out defects detection according to echoed signal in the difference of the frequency entropy with or without fault location, calculated time of arrival and the frequency of flaw echo by the frequency entropy of echoed signal, thus carry out defects detection.
The invention has the beneficial effects as follows: the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy of the present invention and method, for to xoncrete structure, construction of bridge T beam particularly under surroundings, the detection of prestressed pore passage corrugated tube squeezing quality in the beam of railway carriage or compartment, echo information is processed, thus obtain concrete inner structure, synthetic aperture imaging method is utilized to carry out dynamic focusing process to received ultrasound echo signal, connected applications information entropy algorithm processes containing flaw echo, extract defect information, rebuild defect image, extract the information such as the defect of xoncrete structure inside better, more effectively quality monitoring and maintenance are carried out to the xoncrete structure such as bridge or building, reliability is high, be conducive to actual popularization and use.
Accompanying drawing explanation
Fig. 1 is the structural representation of the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy of the present invention.
Fig. 2 is multiple defect schematic diagram that square scanning element of the present invention detects detected concrete structure.
Fig. 3 is the system chart of Signal acquiring and processing module of the present invention.
Fig. 4 is the system chart of judgement of the present invention and display module.
Fig. 5 is the schematic diagram of synthetic aperture focusing of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy of the present invention, comprises
Signal stimulating module, for generation of highpowerpulse signal source;
Signal launching and receiving module, for launching ultrasonic testing signals and receiving echoed signal;
Signal acquiring and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal launching and receiving module to echoed signal sample, quantize and storage;
Judge and display module, based on information entropy algorithm, extract the feature of flaw indication, show testing result;
Described signal stimulating module is connected with signal launching and receiving module, and described signal launching and receiving module is connected with display module with judgement by Signal acquiring and processing module.
Described signal transmitting and receiving module comprises transmitting transducer primitive, receiving transducer array, square scanning element and screw mandrel slide unit, described transmitting transducer primitive is connected with signal stimulating module, described receiving transducer array is connected with Signal acquiring and processing module, described transmitting transducer primitive, receiving transducer array are connected with square scanning element jointly, described square scanning element is arranged on screw mandrel slide unit, and described square scanning element scans detected concrete structure.
Described transmitting transducer primitive for launching ultrasound detection signal, and is the ceramic transmitting transducer matched with the signal source in signal stimulating module, and described ceramic transmitting transducer is circular high-power piezoelectric ceramic transmitting transducer.
Described receiving transducer array is four receiving transducers matched with transmitting transducer, each receiving transducer equally linear array, be placed in four summits of square scanning element, for receiving echoed signal, and send to Signal acquiring and processing module, as shown in Figure 2, square scanning element detects multiple defect schematic diagram of detected concrete structure.
As shown in Figure 3, described Signal acquiring and processing module comprises the operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit that connect successively, and described synthetic aperture algorithm unit comprises the matched filtering circuit, delay circuit and the terminal that connect successively; Described synthetic aperture algorithm unit adopts synthetic aperture focusing technology (SF), i.e. multicast pattern, launch detection signal by single transducer, multiple receive MUT processes with the echoed signal of internal structural information, realize dynamic focusing imaging, for determining the shape information of defect, by terminal control signal Acquire and process module acquires echoed signal, and the data of collection are stored in calculation machine terminal.
As shown in Figure 4, described judgement and display module comprise the information entropy algorithm identifying unit and display unit that are connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information from each receiving transducer Received signal strength, comprises Time-frequency Filter module, information entropy algoritic module and threshold determination; Described display unit image demonstrates the defect information data obtained, whether the defect showing detected concrete structure exists, defective locations and defect shape, described Time-frequency Filter module is for reducing the impact of noise, described information entropy algoritic module utilizes frequency entropy algorithm to go to judge defect information, and described threshold determination is for determining the position of defect.
Operate in the detection method of the above-mentioned corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, comprise the following steps,
Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive, produces the ultrasonic testing signals for detecting detected concrete structure;
Step (2) receiving transducer array receives echoed signal;
Step (3) Signal acquiring and processing module is sampled to the echoed signal that reception transducer array receives, is quantized and stores processor;
Step (4) drives square scanning element by screw mandrel slide unit, adopts the mode of stepping linearly to move with fixing speed, repeats step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;
Step (5) Signal acquiring and processing module adopts synthetic aperture focusing to process the echoed signal collected, and result is outputted to judgement and display module, synthetic aperture focusing is adopted to be treated to as adopting multicast pattern to the echoed signal collected, realize dynamic focusing imaging, determine the shape information function of defect point, as shown in Figure 5, specific as follows
(1) defect point P is set to the distance of transmitting transducer primitive as r
1m, defect point P is r to the distance of receiving transducer array
2mthen,
Wherein, R is the vertical range of defect point P to transmitting transducer primitive place plane; d
1m, d
2mfor the horizontal vertical range of transmitting transducer primitive, receiving transducer array defect point P;
(2) because distance r
1m, r
2malong with d
1m, d
2mchange parabolically type, distance r
1m, r
2mdifferent, then sound wave receives elapsed time difference by being sent to, also just time delay is caused, phase place also can be sued for peace the superposition of the reflection echo of defect point P on each aperture also average along curve along with change, the shape of defect point P will highlight, thus realizes the focusing at defect point P, in m echoed signal, the moment of the echoed signal arrival receiving transducer array of defect point P is
Wherein, c is the bulk sound velocity that sound wave is propagated in testee, the superposition of each echoed signal of defect point P is averaged again, obtains the shape information function s of the defect point P after focusing on
r(t),
Wherein, s (t-t
m) representing the echo receiving defect point P in m echoed signal, M is echoed signal number;
Step (6) judges to judge with the data of display module to echoed signal, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data obtained, whether the defect showing detected concrete structure exists, defective locations and defect shape, decision process is based on frequency entropy algorithm, and the method extracting the defect information of echoed signal is
(1) according to the flaw echo model that the echoed signal received is set up, described flaw echo model is the shape information function s of the defect point P after focusing on
rt (), tries to achieve its frequency-domain function s by Fourier transform
r(ω);
(2) carry out defects detection according to echoed signal in the difference of the instantaneous frequency with or without fault location, calculated time of arrival and the frequency of flaw echo by the entropy of the instantaneous frequency of echoed signal, thus carry out defects detection, specific algorithm is as follows,
1) by the frequency-domain function s of echoed signal
r(ω) probability density that every dot frequency occurs, is tried to achieve
2) obtain the entropy of instantaneous frequency according to every dot frequency probability density, it can be used as the Entropy of Instantaneous Frequency of frequency i,
H
i＝-p
i*log
2p
i
3) the Entropy of Instantaneous Frequency summation of often being put in the n moment, obtains the frequency entropy in n moment,
4) according to 2), 3) the minimal value position of entropy that detects is then the defective locations that is launching site with this position.
In this algorithm, the signal singularity composition of the less correspondence of entropy is more, and signal distributions is more uneven.Within the time period comprising defect, echoed signal comprises the signal content such as defect and concrete, and unusual composition is relatively many, and therefore frequency entropy should be a smaller value, and zero defect place is corresponding higher value then, i.e. the corresponding minimum point of the frequency entropy of fault location.Therefore, for containing flaw echo, a threshold value can be set, when the minimal value of frequency entropy carries out 4 lower than during threshold value) algorithm judgement.
Corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy of the present invention and method, for to xoncrete structure, particularly construction of bridge T beam, the detection of prestressed pore passage corrugated tube squeezing quality in the beam of railway carriage or compartment, echo information is processed, thus obtain concrete inner structure, synthetic aperture imaging method is utilized to carry out dynamic focusing process to received ultrasound echo signal, connected applications information entropy algorithm processes containing flaw echo, extract defect information, rebuild defect image, extract the information such as the defect of xoncrete structure inside better, more effectively quality monitoring and maintenance are carried out to the xoncrete structure such as bridge or building, reliability is high, be conducive to actual popularization and use.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is by appending claims and equivalent circle thereof.
Claims (6)
1., based on the corrugated tube squeezing quality pick-up unit of synthetic aperture and information entropy, it is characterized in that: comprise
Signal stimulating module, for generation of highpowerpulse signal source;
Signal launching and receiving module, for launching ultrasonic testing signals and receiving echoed signal;
Signal acquiring and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal launching and receiving module to echoed signal sample, quantize and storage;
Judge and display module, based on information entropy algorithm, extract the feature of flaw indication, show testing result, judge defect;
Described signal stimulating module is connected with signal launching and receiving module, and described signal launching and receiving module is connected with display module with judgement by Signal acquiring and processing module;
Described signal transmitting and receiving module comprises transmitting transducer primitive, receiving transducer array, square scanning element and screw mandrel slide unit, described transmitting transducer primitive is connected with signal stimulating module, described receiving transducer array is connected with Signal acquiring and processing module, described transmitting transducer primitive, receiving transducer array are connected with square scanning element jointly, described square scanning element is arranged on screw mandrel slide unit, and described square scanning element scans detected concrete structure;
Described transmitting transducer primitive for launching ultrasound detection signal, and is the ceramic transmitting transducer matched with the signal source in signal stimulating module;
Described receiving transducer array is four receiving transducers matched with transmitting transducer, each receiving transducer equally linear array, being placed in four summits that square sweeps scanning element, for receiving echoed signal, and sending to Signal acquiring and processing module;
Described judgement and display module comprise the information entropy algorithm identifying unit and display unit that are connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information from each receiving transducer Received signal strength, comprises Time-frequency Filter module, information entropy algoritic module and threshold determination; Described display unit image demonstrates the defect information data obtained, and whether the defect showing detected concrete structure exists, defective locations and defect shape.
2. the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy according to claim 1, it is characterized in that: described Signal acquiring and processing module comprises the operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit that connect successively, and described synthetic aperture algorithm unit comprises the matched filtering circuit, delay circuit and the terminal that connect successively.
3. operate in the detection method of the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy according to claim 1, it is characterized in that: comprise the following steps,
Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive, produces the ultrasonic testing signals for detecting detected concrete structure;
Step (2) receiving transducer array receives echoed signal;
Step (3) Signal acquiring and processing module is sampled to the echoed signal that reception transducer array receives, is quantized and stores processor;
Step (4) drives square scanning element by screw mandrel slide unit, the mode of stepping is adopted linearly to move with fixing speed, repeat step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;
Step (5) Signal acquiring and processing module adopts synthetic aperture focusing to process the echoed signal collected, and result is outputted to judgement and display module;
Step (6) judges to judge with the data of display module to echoed signal, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data obtained, whether the defect showing detected concrete structure exists, defective locations and defect shape.
4. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 3, it is characterized in that: step (5) Signal acquiring and processing module adopts synthetic aperture focusing to be employing multicast pattern to the method that the echoed signal collected processes, realize dynamic focusing imaging, determine the shape information function of defect point, specific as follows
(1) defect point P is set to the distance of transmitting transducer primitive as r
1m, defect point P is r to the distance of receiving transducer array
2mthen,
Wherein, R is the vertical range of defect point P to transmitting transducer primitive place plane; d
1m, d
2mfor the horizontal vertical range of transmitting transducer primitive, receiving transducer array defect point P;
(2) along curve the reflection echo of defect point P on each aperture superposition summation also on average, the shape of defect point P will highlight, thus realizes the focusing at defect point P, in m echoed signal, the moment of the echoed signal arrival receiving transducer array of defect point P is
Wherein, c is the bulk sound velocity that sound wave is propagated in testee, the superposition of each echoed signal of defect point P is averaged again, obtains the shape information function s of the defect point P after focusing on
r(t),
Wherein, s (t-t
m) representing the echo receiving defect point P in m echoed signal, M is echoed signal number.
5. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 3, is characterized in that: step (6) decision process is based on frequency entropy algorithm, and the method extracting the defect information of echoed signal is,
(1) according to the flaw echo model that the echoed signal received is set up, described flaw echo model is the shape information function s of the defect point P after focusing on
rt (), tries to achieve its frequency-domain function s by Fourier transform
r(ω);
(2) defects detection is carried out according to echoed signal in the difference of the frequency entropy with or without fault location.
6. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 5, it is characterized in that: (2) carry out defects detection according to echoed signal in the difference of the frequency entropy with or without fault location, calculated time of arrival and the frequency of flaw echo by the frequency entropy of echoed signal, thus carry out defects detection.
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| CN103743820B (en) * | 2014-02-28 | 2016-08-17 | 江苏理工学院 | Concrete column quality ultrasound based on universe transition time parameter detection device and method |
| CN104132995A (en) * | 2014-07-29 | 2014-11-05 | 河海大学常州校区 | Ultrasonic nondestructive testing method based on deconvolution technology |
| CN104181234B (en) * | 2014-08-29 | 2017-06-06 | 河海大学常州校区 | A kind of lossless detection method based on multiple signal treatment technology |
| CN104698087A (en) * | 2015-03-30 | 2015-06-10 | 河海大学常州校区 | Prestressed duct slurry stripping degree detecting device and method based on recursive singular entropy |
| CN105136907B (en) * | 2015-08-14 | 2018-03-02 | 山东大学 | A kind of mud jacking density intelligent checking system and method based on flat survey method |
| CN106290575B (en) * | 2016-09-13 | 2018-11-09 | 河海大学常州校区 | " rice " font phase controlled ultrasonic array detects the device and method of 3 D workpiece crackle |
| CN107966493B (en) * | 2017-11-27 | 2020-06-09 | 安徽工业大学 | Ultrasonic flaw detection judging method for rolled steel defects |
| CN109001248B (en) * | 2018-06-26 | 2020-10-02 | 哈尔滨工业大学 | Asphalt mixture freezing-thawing damage evaluation method based on image information entropy |
| CN112485336B (en) * | 2020-11-23 | 2022-04-15 | 西南交通大学 | Laser ultrasonic synthetic aperture imaging method based on differential technology |
| CN113218839B (en) * | 2021-04-27 | 2022-07-12 | 江西理工大学 | Monitoring method, device and system for permeation destruction phenomenon of tailing pond |
| CN113252774B (en) * | 2021-06-07 | 2021-10-08 | 北京唯恩传感技术有限公司 | Detection system based on ultrasonic transduction |
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