CN103604868A - Corrugated pipe grouting quality detection device and method based on synthetic aperture and information entropy - Google Patents

Abstract

The invention discloses corrugated pipe grouting quality detection device and method based on synthetic aperture and information entropy. Echo information is processed so that an internal structure of concrete is obtained; received ultrasonic echo signals are subjected to dynamic focusing processing by using a synthetic aperture imaging method, echo signals containing defects are processed by combining with an information entropy algorithm, defect information is extracted, the defects are judged, a defect image is reconstructed, and information such as the defects inside a concrete structure is well extracted in a daily environment, so that quality monitoring and maintaining are carried out on the concrete structure such as a bridge or building are effectively carried out, the reliability is high, and actual popularization and use are facilitated.

Description

Corrugated tube squeezing quality pick-up unit and method based on synthetic aperture and information entropy

Technical field

The invention discloses a kind ofly for to prestressed corrugated tube squeezing quality ultrasonic no damage detection device and the method based on synthetic aperture and information entropy of xoncrete structure, 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, to existing the construction project of potential safety hazard to carry out safety assessment, be an imperative job, wherein the detection about prestressed pore passage corrugated tube squeezing quality in bridge beam slab is one of emphasis, and whether mud jacking is closely knit will directly affect bulk strength and the permanance of prestressed component.

The detection of traditional squeezing quality, mainly by managing the pulp situation of slurries in field observation slip casting process, whether with this, differentiate this hole squeezing quality meets the requirements, there is very large subjectivity random, moreover the mobility status of slurries in hole is subject to the factor controllings such as constructing operation, mud jacking pressure, and management personnel are difficult to differentiate the full and fixed 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, by the route of transmission of elastic wave, and to elasticity wave amplitude, frequency, the isoparametric understanding of wave amplitude has been identified zero defect, but the multi-solution of elastic waveform stereoscopic allows people be difficult to judgement, and effect is also not obvious.In addition grouted aggregate concrete material is a kind of heterogeneous structure material that consists of heterogeneous compound system grout, hole, deformed bar and corrugated tube etc., each phase is weave in randomly, form very complicated inner structure, be again heterogeneous condensed matter and the heterogeneous material with bullet, sticky, plasticity, it is carried out without damaged, detecting also with regard to more complicated fast.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, can make the silver halide in film emulsion layer 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, and check speed can be slower;

(2) magnetic detects: after ferrimagnet and workpiece are magnetized, existence due to uncontinuity, make the magnetic line of force on surface of the work and nearly surface local distortion occur and produce stray field, absorption is applied to the magnetic of surface of the work, be formed on appropriate light according to lower visual visible magnetic trace, thereby demonstrate position, shape and the size of uncontinuity.But the shape and size of workpiece are sometimes influential to detecting, because being difficult to magnetization, it cannot detect;

(3) Liquid Penetrant method: piece surface is applied after the bleeding agent that contains fluorescent dye or illuminating colour, under capillarity, through after a while, penetrating fluid can penetrate in Surface-breaking defect; After removing the unnecessary penetrating fluid of piece surface, at piece surface, apply developer again, equally, under effect capillaceous, developer is by the penetrating fluid that attracts to retain in defect, and penetrating fluid bleeds back in developer, under certain light source, the penetrating fluid vestige of fault location is by reality, thereby detects pattern and the distribution of defect.But infiltration detects 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, when ultrasound wave runs into heterogeneous interface in communication process, can reflect, refraction and waveform transformation, the sound wave reflecting again by couplant popped one's head in reception, amplify after in fluorescence screen display, according to reflection echo position judgment whether according to the equivalent size of echo height judgement defect reflection face.But, cannot obtain defect visual image, qualitative difficulty, quantitative accuracy is not high, and, at the detection crackle class planar defect parallel with acoustic beam, detect rate very low, easily undetected.

We know, xoncrete structure is a kind of heterogeneous body, porous, form 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 meet inherent vice such as caking cavity etc., will be by these structural scatterings, generation is with the echoed signal of the acoustic characteristic information of internal structure of body, gather and process these echoed signals, can obtain concrete internal structural information.But, the characteristic of concrete itself, make high frequency band decay therein larger, and the directive property that ripple is propagated in concrete is also poor, simultaneously, can be with the impact of random noise in routine testing, so accuracy and precision that current pick-up unit and method detect, also all cannot reach engine request, often occurs 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 providing and method are accurate, practical, economic Non-Destructive Testing, can extract better the information such as defect of xoncrete structure inside, more effectively the xoncrete structures such as bridge or building are carried out to quality monitoring and maintenance, 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:

A corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, is characterized in that: comprise

Signal stimulating module, for generation of highpowerpulse signal source;

Signal transmitting and receiver module, for launching ultrasonic testing signals and receiving echoed signal;

Signals collecting and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal transmitting and receiver 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 receiver module with signal transmitting, and described signal transmitting is connected with display module with judgement with processing module by signals collecting with receiver 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 processing module with signals collecting, 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 used for launching ultrasound detection signal, and for signal stimulating module in the ceramic transmitting transducer that matches of signal source.

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 that match with transmitting transducer, each receiving transducer is equidistant linear array, be placed in square and sweep four summits of scanning element, be used for receiving echoed signal, and send to signals collecting 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 signals collecting comprises with processing module operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit being connected successively, described synthetic aperture algorithm unit comprises matched filtering circuit, delay circuit and the terminal connecting successively.

The aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, it is characterized in that: described judgement comprises with display module information entropy algorithm identifying unit and the display unit being connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information that receives signal from each receiving transducer, comprises time-frequency filtration module, information entropy algoritic module and threshold determination; Described display unit demonstrates the defect information data that obtain with image, whether the defect that shows detected concrete structure exists, defective locations and defect shape.

The detection method that operates in the aforesaid corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, is characterized in that: comprises the following steps,

Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive produces the ultrasonic testing signals for detection of detected concrete structure;

Step (2) receiving transducer array receives echoed signal;

Step (3) signals collecting and processing module to the echoed signal that receives transducer array and receive sample, quantification and stores processor;

Step (4) drives square scanning element by screw mandrel slide unit, adopts the mode of stepping to move with the speed of fixing along straight line, and repeating step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;

Step (5) signals collecting and processing module adopt synthetic aperture focusing to process the echoed signal collecting, and result is outputed to and judged and display module;

Step (6) is judged with display module the data of echoed signal is judged, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data that obtain, whether the defect that shows 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: it is employing multicast pattern that step (5) signals collecting and processing module adopt the method that synthetic aperture focusing is processed the echoed signal collecting, realize dynamic focusing imaging, determine the shape information function of defect point, specific as follows

(1) establishing defect point P is r to the distance of transmitting transducer primitive _1m, defect point P is r to the distance of receiving transducer array _2m,

$r_{1m}=\sqrt{R^2+{d_{1m}}^2},r_{2m}=\sqrt{R^2+{{\mathrm{<figure-callout\; id="2m"\; label="d"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">d</figure-callout>}}_{2m}}^2},m=\mathrm{1,2,3}...M$

Wherein, R is that defect point P is to the vertical range of transmitting transducer primitive place plane; d _1m, d _2mhorizontal vertical range for transmitting transducer primitive, receiving transducer array defect point P;

(2) along curve, the reflection echo of defect point P on each aperture stack summation is also average, the shape of defect point P will highlight, thereby realizes the focusing at defect point P, in m echoed signal, the moment that the echoed signal of defect point P arrives receiving transducer array is

$t_m={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_2=\frac{r_1}{c}+\frac{r_2}{c}=\frac{1}{c}(\sqrt{R^2+{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">d</figure-callout>}}_1^2}+\sqrt{R^2+d_2^2}),m=\mathrm{1,2,3}...M$

Wherein, c is the bulk sound velocity that sound wave is propagated in testee, each echoed signal stack of defect point P is averaged again, and the shape information function s of the defect point P after being focused on _r(t),

$s_r\left(t\right)=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}s(t-t_m)$

Wherein, s (t-t _m) representing to receive in m echoed signal the echo of defect point P, 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 for extracting the defect information of echoed signal is,

(1) the flaw echo model of setting up according to the echoed signal receiving, described flaw echo model is the shape information function s of the defect point P after focusing on _r(t), by Fourier transform, try to achieve its frequency-domain function s _r(ω);

(2) according to echoed signal, having or not the difference of the frequency entropy of fault location to carry out defects detection.

The aforesaid corrugated tube squeezing quality detection method based on synthetic aperture and information entropy, it is characterized in that: (2) are having or not the difference of the frequency entropy of fault location to carry out defects detection according to echoed signal, by the frequency entropy of echoed signal, calculate time of arrival and the frequency of flaw echo, thereby carry out defects detection.

The invention has the beneficial effects as follows: corrugated tube squeezing quality pick-up unit and the method based on synthetic aperture and information entropy of the present invention, be used for xoncrete structure, the construction of bridge T beam under surroundings particularly, the detection of prestressed pore passage corrugated tube squeezing quality in the beam of railway carriage or compartment, echo information is processed, thereby obtain concrete inner structure, utilize synthetic aperture imaging method to carry out dynamic focusing processing to received ultrasound echo signal, in conjunction with application message entropy algorithm, to containing flaw echo, process, extract defect information, rebuild defect image, extract better the information such as defect of xoncrete structure inside, more effectively the xoncrete structures such as bridge or building are carried out to quality monitoring and maintenance, 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 a plurality of defect schematic diagram that square scanning element of the present invention detects detected concrete structure.

Fig. 3 is the system chart of signals collecting of the present invention and processing module.

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 transmitting and receiver module, for launching ultrasonic testing signals and receiving echoed signal;

Signals collecting and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal transmitting and receiver 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 receiver module with signal transmitting, and described signal transmitting is connected with display module with judgement with processing module by signals collecting with receiver 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 processing module with signals collecting, 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 is used for launching ultrasound detection signal, and for signal stimulating module in the ceramic transmitting transducer that matches of signal source, described ceramic transmitting transducer is circular high-power piezoelectric ceramic transmitting transducer.

Described receiving transducer array is four receiving transducers that match with transmitting transducer, each receiving transducer is equidistant linear array, be placed in four summits of square scanning element, be used for receiving echoed signal, and send to signals collecting and processing module, as shown in Figure 2, square scanning element detects a plurality of defect schematic diagram of detected concrete structure.

As shown in Figure 3, described signals collecting comprises with processing module operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit being connected successively, and described synthetic aperture algorithm unit comprises matched filtering circuit, delay circuit and the terminal connecting successively; Described synthetic aperture algorithm unit adopts synthetic aperture focusing technology (SF), it is multicast pattern, by single transducer, launching detection signal, a plurality of transducer receives and processes with the echoed signal of internal structural information, realize dynamic focusing imaging, for determining the shape information of defect, by terminal control signal, gather with processing module and gather echoed signal, and the data of collection are stored in calculation machine terminal.

As shown in Figure 4, described judgement comprises with display module information entropy algorithm identifying unit and the display unit being connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information that receives signal from each receiving transducer, comprises time-frequency filtration module, information entropy algoritic module and threshold determination; Described display unit demonstrates the defect information data that obtain with image, whether the defect that shows detected concrete structure exists, defective locations and defect shape, described time-frequency filtration 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.

The detection method that operates in the above-mentioned corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, comprises the following steps,

Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive produces the ultrasonic testing signals for detection of detected concrete structure;

Step (2) receiving transducer array receives echoed signal;

Step (3) signals collecting and processing module to the echoed signal that receives transducer array and receive sample, quantification and stores processor;

Step (4) drives square scanning element by screw mandrel slide unit, adopts the mode of stepping to move with the speed of fixing along straight line, and repeating step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;

Step (5) signals collecting and processing module adopt synthetic aperture focusing to process the echoed signal collecting, and result is outputed to and judged and display module, adopt synthetic aperture focusing to be treated to as adopting multicast pattern the echoed signal collecting, realize dynamic focusing imaging, determine the shape information function of defect point, as shown in Figure 5, specific as follows

(1) establishing defect point P is r to the distance of transmitting transducer primitive _1m, defect point P is r to the distance of receiving transducer array _2m,

$r_{1m}=\sqrt{R^2+{d_{1m}}^2},{\mathrm{<figure-callout\; id="2m"\; label="r"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">r</figure-callout>}}_{2m}=\sqrt{R^2+{{\mathrm{<figure-callout\; id="2m"\; label="d"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">d</figure-callout>}}_{2m}}^2},m=\mathrm{1,2,3}...M$

Wherein, R is that defect point P is to the vertical range of transmitting transducer primitive place plane; d _1m, d _2mhorizontal vertical range for transmitting transducer primitive, receiving transducer array defect point P;

(2) because apart from r _1m, r _2malong with d _1m, d _2mvariation be parabolic type, apart from r _1m, r _2mdifferent, sound wave receives elapsed time difference by sending to, also just caused time delay, phase place also can be along with changing along curve the reflection echo of defect point P on each aperture stack summation average, the shape of defect point P will highlight, thereby realizes the focusing at defect point P, in m echoed signal, the moment that the echoed signal of defect point P arrives receiving transducer array is

$t_m={\mathrm{<figure-callout\; id="1"\; label="t"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">t</figure-callout>}}_1+t_2=\frac{r_1}{c}+\frac{r_2}{c}=\frac{1}{c}(\sqrt{R^2+{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HDA0000408278270000023.png"\; state="\{\{state\}\}">d</figure-callout>}}_1^2}+\sqrt{R^2+d_2^2}),m=\mathrm{1,2,3}...M$

Wherein, c is the bulk sound velocity that sound wave is propagated in testee, each echoed signal stack of defect point P is averaged again, and the shape information function s of the defect point P after being focused on _r(t),

$s_r\left(t\right)=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}s(t-t_m)$

Wherein, s (t-t _m) representing to receive in m echoed signal the echo of defect point P, M is echoed signal number;

Step (6) is judged with display module the data of echoed signal is judged, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data that obtain, whether the defect that shows detected concrete structure exists, defective locations and defect shape, decision process is based on frequency entropy algorithm, and the method for extracting the defect information of echoed signal is

(1) the flaw echo model of setting up according to the echoed signal receiving, described flaw echo model is the shape information function s of the defect point P after focusing on _r(t), by Fourier transform, try to achieve its frequency-domain function s _r(ω);

(2) according to echoed signal, having or not the difference of the instantaneous frequency of fault location to carry out defects detection, the entropy of the instantaneous frequency by echoed signal calculates time of arrival and the frequency of flaw echo, thereby carries out defects detection, and specific algorithm is as follows,

1) by the frequency-domain function s of echoed signal _r(ω), try to achieve the probability density that every dot frequency occurs $p_i=s_{\mathrm{ri}}\left(\mathrm{\&omega;}\right)/\underset{i}{\mathrm{\&Sigma;}}{s}_{\mathrm{ri}}\left(\mathrm{\&omega;}\right);$

2) according to every dot frequency probability density, obtain the entropy of instantaneous frequency, the Entropy of Instantaneous Frequency using it as frequency i,

H _i＝-p _i*log ₂p _i

3) by the n Entropy of Instantaneous Frequency summation of every constantly, obtain n frequency entropy constantly,

$H_n=\underset{i}{\mathrm{\&Sigma;}}{H}_i$

4) according to 2), 3) the minimal value position of the entropy that detects is to take the defective locations that this position is launching site.

In this algorithm, the signal singularity composition of the less correspondence of entropy is just more, and signal distributions is just more inhomogeneous.Comprising in the time period of defect, echoed signal comprises the signal contents such as defect and concrete, and unusual composition is relatively many, so frequency entropy should be a smaller value, and zero defect place is corresponding higher value, i.e. the corresponding minimum point of the frequency entropy of fault location.Therefore, for containing flaw echo, can set a threshold value, when the minimal value of frequency entropy carries out 4 during lower than threshold value) algorithm judgement.

Corrugated tube squeezing quality pick-up unit and method based on synthetic aperture and information entropy of the present invention, be used for xoncrete structure, construction of bridge T beam particularly, the detection of prestressed pore passage corrugated tube squeezing quality in the beam of railway carriage or compartment, echo information is processed, thereby obtain concrete inner structure, utilize synthetic aperture imaging method to carry out dynamic focusing processing to received ultrasound echo signal, in conjunction with application message entropy algorithm, to containing flaw echo, process, extract defect information, rebuild defect image, extract better the information such as defect of xoncrete structure inside, more effectively the xoncrete structures such as bridge or building are carried out to quality monitoring and maintenance, reliability is high, be conducive to actual popularization and use.

More than show and described 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; that in above-described embodiment and instructions, describes 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.The claimed scope of the present invention is by appending claims and equivalent circle thereof.

Claims (10)

1. the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy, is characterized in that: comprise

Signal stimulating module, for generation of highpowerpulse signal source;

Signal transmitting and receiver module, for launching ultrasonic testing signals and receiving echoed signal;

Signals collecting and processing module, based on synthetic aperture algorithm, to the receiving transducer array received in signal transmitting and receiver 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 receiver module with signal transmitting, and described signal transmitting is connected with display module with judgement with processing module by signals collecting with receiver module.

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 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 processing module with signals collecting, 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.

3. the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy according to claim 2, it is characterized in that: described transmitting transducer primitive is used for launching ultrasound detection signal, and for signal stimulating module in the ceramic transmitting transducer that matches of signal source.

4. the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy according to claim 2, it is characterized in that: described receiving transducer array is four receiving transducers that match with transmitting transducer, each receiving transducer is equidistant linear array, be placed in square and sweep four summits of scanning element, be used for receiving echoed signal, and send to signals collecting and processing module.

5. 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 signals collecting comprises with processing module operational amplifier, high-speed a/d converter, High-speed Control unit, data storage cell and the synthetic aperture algorithm unit being connected successively, described synthetic aperture algorithm unit comprises matched filtering circuit, delay circuit and the terminal connecting successively.

6. 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 judgement comprises with display module information entropy algorithm identifying unit and the display unit being connected, described information entropy algorithm identifying unit utilizes frequency entropy algorithm to go to judge the defect information that receives signal from each receiving transducer, comprises time-frequency filtration module, information entropy algoritic module and threshold determination; Described display unit demonstrates the defect information data that obtain with image, whether the defect that shows detected concrete structure exists, defective locations and defect shape.

7. the detection method that operates in the corrugated tube squeezing quality pick-up unit based on synthetic aperture and information entropy claimed in claim 1, is characterized in that: comprises the following steps,

Step (1) signal stimulating module produces highpowerpulse signal, and stimulated emission transducer primitive produces the ultrasonic testing signals for detection of detected concrete structure;

Step (2) receiving transducer array receives echoed signal;

Step (3) signals collecting and processing module to the echoed signal that receives transducer array and receive sample, quantification and stores processor;

Step (4) drives square scanning element by screw mandrel slide unit, adopts the mode of stepping to move with the speed of fixing along straight line, and repeating step (2), (3), until square scanning element completes the scanning of the whole surveyed area of detected concrete structure;

Step (5) signals collecting and processing module adopt synthetic aperture focusing to process the echoed signal collecting, and result is outputed to and judged and display module;

Step (6) is judged with display module the data of echoed signal is judged, decision process is based on frequency entropy algorithm, extract the defect information of echoed signal, and image demonstrates the defect information data that obtain, whether the defect that shows detected concrete structure exists, defective locations and defect shape.

8. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 7, it is characterized in that: it is employing multicast pattern that step (5) signals collecting and processing module adopt the method that synthetic aperture focusing is processed the echoed signal collecting, realize dynamic focusing imaging, determine the shape information function of defect point, specific as follows

(1) establishing defect point P is r to the distance of transmitting transducer primitive _1m, defect point P is r to the distance of receiving transducer array _2m,

$r_{1m}=\sqrt{R^2+{d_{1m}}^2},r_{2m}=\sqrt{R^2+{d_{2m}}^2},m=\mathrm{1,2,3}...M$

Wherein, R is that defect point P is to the vertical range of transmitting transducer primitive place plane; d _1m, d _2mhorizontal vertical range for transmitting transducer primitive, receiving transducer array defect point P;

(2) along curve, the reflection echo of defect point P on each aperture stack summation is also average, the shape of defect point P will highlight, thereby realizes the focusing at defect point P, in m echoed signal, the moment that the echoed signal of defect point P arrives receiving transducer array is

$t_m=t_1+t_2=\frac{r_1}{c}+\frac{r_2}{c}=\frac{1}{c}(\sqrt{R^2+d_1^2}+\sqrt{R^2+d_2^2}),m=\mathrm{1,2,3}...M$

Wherein, c is the bulk sound velocity that sound wave is propagated in testee, each echoed signal stack of defect point P is averaged again, and the shape information function s of the defect point P after being focused on _r(t),

$s_r\left(t\right)=\frac{1}{M}\underset{m=1}{\overset{M}{\mathrm{\&Sigma;}}}s(t-t_m)$

Wherein, s (t-t _m) representing to receive in m echoed signal the echo of defect point P, M is echoed signal number.

9. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 7, is characterized in that: step (6) decision process is based on frequency entropy algorithm, and the method for extracting the defect information of echoed signal is,

(1) the flaw echo model of setting up according to the echoed signal receiving, described flaw echo model is the shape information function s of the defect point P after focusing on _r(t), by Fourier transform, try to achieve its frequency-domain function s _r(ω);

(2) according to echoed signal, having or not the difference of the frequency entropy of fault location to carry out defects detection.

10. the corrugated tube squeezing quality detection method based on synthetic aperture and information entropy according to claim 9, it is characterized in that: (2) are having or not the difference of the frequency entropy of fault location to carry out defects detection according to echoed signal, by the frequency entropy of echoed signal, calculate time of arrival and the frequency of flaw echo, thereby carry out defects detection.

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