CN202216911U - Positioning system of tiny cracks on surface of concrete - Google Patents
Positioning system of tiny cracks on surface of concrete Download PDFInfo
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- CN202216911U CN202216911U CN2011202719976U CN201120271997U CN202216911U CN 202216911 U CN202216911 U CN 202216911U CN 2011202719976 U CN2011202719976 U CN 2011202719976U CN 201120271997 U CN201120271997 U CN 201120271997U CN 202216911 U CN202216911 U CN 202216911U
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Abstract
The utility model discloses a positioning system of tiny cracks on the surface of concrete, which comprises an image acquisition device, a computer digital signal processing (DSP) system and a display. The image acquisition device is used for acquiring real-time strain image on the surface of concrete samples, and outputs digital picture signals before strain and after strain to the computer DSP system. The computer DSP system performs correlation analysis of the digital picture signals before strain and after strain to figure out displacement of each pixel point in the image after strain corresponding to the image before strain, thereby obtaining digital images signals with tiny crack positioning positions. The display comprises a digital to analog converter, the digital images signals with the tiny crack positioning positions are converted into analog image signals through the digital to analog converter, and the display shows the accurate positions of the cracks in real time. The positioning system can distinguish the tiny cracks on the surface of the concrete, does not contact with and damage the samples, and has the advantages of being high in accuracy, simple to operate, high in efficiency and the like.
Description
Technical field
The utility model relates to the detection and location instrument in surface of concrete structure crack, especially relates to a kind of detection and location device of the minute crack that can't discern for the surface of concrete structure naked eyes.
Background technology
The cracking destruction of concrete material is one of basic reason that causes fabric structure destruction, and the germinating of distress in concrete and expansion generally occur in body structure surface, is presented as that local uncontinuity appears in surfacing.If can dope the position of concrete cracking in advance through some measures and technology, and in time take corresponding repairing or safeguard procedures that the crack is handled, will make national economy and people's lives and properties obtain more effective guarantee.Very limited for the means of concrete structure crack detection at present; Modal means are supersonic sounding technology; This technology generally is used for detecting the crack that naked eyes have been told, and utilizes the degree of depth in hyperacoustic measurement of transmission characterist crack and the harmfulness that width is judged the crack.This method measuring accuracy is limited, is difficult to discern crackle, the zone that more can not go crack identification to exist automatically.Certainly, be to remove to detect the minute crack that naked eyes can't discern and to measure its width in theory through reading microscope, if but do not know the position that the crack produces, it is unusual difficulty that this method uses.
Because the uncertainty of crack location, traditional single-point strain measurement method (like foil gauge, strain transducer) is to be difficult to realize the large-scale measurement and positioning of minute crack.Find through early-stage Study; There is surface crack and do not have the xoncrete structure of surface crack; Do the time spent receiving external loads (not reaching the destruction level); Its strain field can demonstrate remarkable difference: do not have the xoncrete structure in crack, its surface strain field is continuous, and the dependent variable level is not high; For the xoncrete structure that has surface crack, the regional area at place, its crack can be because crack load action opening down (or closed) externally, and produce very large dummy strain (promptly comprising the local train that the crack is out of shape).Therefore, can realize detection through measurement to surface crack to strain field.
Summary of the invention
The utility model technical matters to be solved is limited to conventional concrete crack location survey precision; Be difficult to discern crackle; Can not large-range measuring; More can not go the defectives such as zone of crack identification existence automatically, a kind of positioning system of concrete surface minute crack is provided, adopt modern optical ergometry technology also to combine the correlation computations machine technology to realize the on a large scale accurate measurement and positioning of minute crack.
The utility model adopts following technical scheme for solving the problems of the technologies described above:
A kind of positioning system of concrete surface minute crack comprises image collecting device, computing machine dsp system, display; Wherein:
Said image collecting device is used for gathering the real-time strain pattern on concrete sample surface, exports the digital picture signal before the strain, after the strain to the computing machine dsp system successively;
The computing machine dsp system to the strain that receives before, the digital picture signal after the strain carries out correlation analysis; Adopt the cubic surface fitting process calculate all subregion in the image after the strain with respect to strain before the displacement of image; Adopt local least square method to calculate strain field then, obtain to have the data image signal of minute crack position, location;
Display comprises a digital to analog converter, and the data image signal that has minute crack position, location that will receive through digital to analog converter converts analog picture signal to, and demonstrates the accurate position at place, crack in real time.
Further; The positioning system of a kind of concrete surface minute crack of the utility model; Also comprise the peripheral circuit that is connected with the computing machine dsp system, said peripheral circuit comprises: reset circuit, clock circuit, memory circuit, key circuit and power-switching circuit; Wherein:
Said reset circuit is used to provide reset signal;
Said clock circuit is used to control the time interval of image collecting device images acquired;
Said memory circuit is made up of SDRAM and FLASH ROM flash memory, and SDRAM is used for storing image data, and FLASH ROM flash memory is used for the storage system program;
Said key circuit is used for to computing machine dsp system input of control commands and the parameter of clock circuit is set;
Said power-switching circuit is used for converting input voltage into WV.
Further, the positioning system of a kind of concrete surface minute crack of the utility model, said image collecting device comprises bracing frame, CCD camera, confirms CCD image of camera acquisition range through the height and the angle of adjustable support frame.
Further, the positioning system of a kind of concrete surface minute crack of the utility model also comprises additional light source, and said additional light source adopts on-the-spot lighting device.
The utility model adopts above technical scheme compared with prior art, has following technique effect:
At first, but compare the minute crack that the utility model can the detection and location naked eyes can't be discerned with the device that the conventional ultrasonic wave Detection Techniques can only detection and location naked eyes crack identification.
Secondly, detect one by one with conventional art and to compare, the utility model can pass through one-shot measurement, and all width of sample surfaces that just can identify three-dimensional full-size and be 10 meters scopes are greater than 10 microns gap.
At last, compare, the utlity model has with the sample noncontact, to advantages such as sample not damageds with conventional art.
Description of drawings
Fig. 1 is the fundamental diagram of the utility model.
Fig. 2 is the synoptic diagram that the dsp system of the utility model is connected with peripheral circuit.
Fig. 3 is the workflow diagram of the positioning system of the utility model.
Label is explained among the figure: 1-CCD camera, 2-bracing frame, 3-additional light source, 4-computing machine dsp system; 5-display, 6-peripheral circuit, 7-IMAQ scope, 8-reset circuit; 9-clock circuit, 10-memory circuit, 11-key circuit, 12-power-switching circuit.
Embodiment
Below in conjunction with accompanying drawing the technical scheme of the utility model is done further detailed description:
As shown in Figure 1, a kind of detection and location system of concrete surface minute crack, it comprises: CCD camera 1, bracing frame 2, additional light source 3, dsp system 4, display 5 and peripheral circuit 6.
Replenish light source 3 and get on the concrete component, make the image effect of camera collection reach optimum.
Computing machine dsp system 4 obtains the data image signal on the forward and backward concrete sample of the strain surface of video camera output; Digital picture is handled; Through with after the strain with strain before the digital picture relevant matches analyze the image before and after the concrete sample surface deformation, obtain deformation field through the correlation analysis before and after the distortion, calculate strain field through local least square method on this basis again; Through Treatment Analysis to strain field; And then the position at definite minute crack place, the data image signal that will have minute crack position, location is then passed to display 5, and concrete processing procedure specifically illustrates hereinafter.
The data image signal that has minute crack position, location that display 5 will receive obtains analog picture signal through digital to analog converter, and in the accurate position that on display 5, shows the place, crack in real time.
6 pairs of whole devices of peripheral circuit play control action, and cooperate dsp system 4 to accomplish the collection and the processing of data.
As shown in Figure 2, peripheral circuit 6 comprises: reset circuit 8, clock circuit 9, memory circuit 10, key circuit 11 and power-switching circuit 12.
In use; Connect all circuit earlier; Start power-switching circuit 12 through control key circuit 11 and obtain WV; And being written into the system program that FLASH ROM flash memories are deposited in the memory circuitry 10, total system is carried out opening initialization, if the initialization procedure during whole locating device is operated when having started reset circuit 8 and having pressed reset key in the operating process.Clock circuit 9 instructed to dsp system 4 timed sending according to the time interval of the device IMAQ that key circuit 11 is set; Dsp system 4 obtains data image signal through camera 1 after receiving order; And carry out analyzing and processing; Final Output Display Unit 5 has the data image signal of crack location, and the data image signal that 5 pairs of displays have crack location carries out digital-to-analog conversion, finally on display, appears.
The principle of work of computing machine dsp system:
The cardinal principle of the computing machine dsp system of the utility model is that basis is for the xoncrete structure that has surface crack; The regional area at its place, crack; Can be because crack load action opening down (or closure) externally; And produce very large dummy strain, promptly the singularity of strain field is located the position, crack.
As shown in Figure 3, the practical implementation step is exemplified below:
Steps A: concrete sample to be measured is carried out surface treatment, remove non-structure attachment, make that the surface of concrete sample to be measured is simply smooth;
Step B: when the test site insufficient light, arrange on-the-spot lighting device in test site;
Step C: gather concrete sample to be measured surface reference picture through image collecting device;
Step D: adopt charger that concrete sample to be measured is applied and be parallel to load its surface, that be not less than concrete material breakdown strength 10%, and remain to the step e completion;
Step e: through the concrete sample surface target image behind the image collecting device collection imposed load;
Step F: the concrete sample surface reference picture that step C is collected, the concrete sample target image that step e collects send to the computing machine dsp system and carry out correlation analysis, obtain all subregion in the target image with respect to the displacement of reference picture;
Step G: the relative displacement of all subregion in the target image that obtains according to step F; Calculate the local train value of all subregion in the target image respectively with the partial least squares method; The local train value surpasses the zone of 800-1200 microstrain, is the position of minute crack.
Correlation analysis described in the step F is based on the digital picture correlation technique, through two width of cloth digital pictures are carried out relevant matches.Matching principle is: calculate in the target image related coefficient of all subregions in certain sub regions and reference picture respectively through following formula:
Wherein:
CBe related coefficient;
For doing with reference to map reference
The gray scale of point;
Average gray for the reference diagram subregion;
For the target map reference does
The gray scale of point;
Average gray for target figure subregion.
Work as related coefficient
C, represent that two width of cloth subregions are identical at=1 o'clock.But because distortion, generally can not be identical, so will with the related coefficient of this subregion in the target image
CThe subregion of the pairing reference picture of maximal value mate.After all subregions in two width of cloth image calculation zones carry out relevant matches before and after the distortion; Just can obtain the variation of these space geometry positions before and after distortion; The displacement field that promptly obtains the zoning distributes, and the cubic surface fitting process of employing related coefficient reaches the displacement measurement precision of sub-pix.Adopt the partial least squares method to calculate strain field at last.Can adopt the characteristic of this strain field distribution of Computer Automatic Recognition, judge singular regions, thereby judge the position, crack.
Claims (4)
1. the positioning system of a concrete surface minute crack is characterized in that: comprise image collecting device, computing machine dsp system, display; Wherein:
Said image collecting device is used for gathering the real-time strain pattern on concrete sample surface, exports the digital picture signal before the strain, after the strain to the computing machine dsp system successively;
The computing machine dsp system is used to obtain to have the data image signal of minute crack position, location;
Display comprises a digital to analog converter, and the data image signal that has minute crack position, location that will receive through digital to analog converter converts analog picture signal to, and demonstrates the accurate position at place, crack in real time.
2. the positioning system of a kind of concrete surface minute crack according to claim 1; It is characterized in that: also comprise the peripheral circuit that is connected with the computing machine dsp system, said peripheral circuit comprises: reset circuit, clock circuit, memory circuit, key circuit and power-switching circuit; Wherein:
Said reset circuit is used to provide reset signal;
Said clock circuit is used to control the time interval of image collecting device images acquired;
Said memory circuit is made up of SDRAM and FLASH ROM flash memory, and SDRAM is used for storing image data, and FLASH ROM flash memory is used for the storage system program;
Said key circuit is used for to computing machine dsp system input of control commands and the parameter of clock circuit is set;
Said power-switching circuit is used for converting input voltage into WV.
3. the positioning system of a kind of concrete surface minute crack according to claim 1 is characterized in that: said image collecting device comprises bracing frame, CCD camera, confirms CCD image of camera acquisition range through the height and the angle of adjustable support frame.
4. the positioning system of a kind of concrete surface minute crack according to claim 1 is characterized in that: also comprise additional light source, said additional light source adopts on-the-spot lighting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202719976U CN202216911U (en) | 2011-07-29 | 2011-07-29 | Positioning system of tiny cracks on surface of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202719976U CN202216911U (en) | 2011-07-29 | 2011-07-29 | Positioning system of tiny cracks on surface of concrete |
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| CN202216911U true CN202216911U (en) | 2012-05-09 |
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| CN2011202719976U Expired - Fee Related CN202216911U (en) | 2011-07-29 | 2011-07-29 | Positioning system of tiny cracks on surface of concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165892A (en) * | 2014-07-25 | 2014-11-26 | 中国科学院东北地理与农业生态研究所 | Soil crack parameter online measuring system and method for realizing soil crack parameter extraction by system |
| CN106225736A (en) * | 2016-07-05 | 2016-12-14 | 中铁第五勘察设计院集团有限公司 | A kind of interior formwork detection device |
| CN107607397A (en) * | 2017-09-15 | 2018-01-19 | 重庆交通大学 | Defect inspection method and device |
| CN110360979A (en) * | 2019-07-04 | 2019-10-22 | 哈尔滨工业大学（深圳） | A kind of distress in concrete monitoring method and system |
| CN113155042A (en) * | 2021-04-13 | 2021-07-23 | 江苏大学 | Method for measuring thickness of transition zone of concrete internal interface |
-
2011
- 2011-07-29 CN CN2011202719976U patent/CN202216911U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165892A (en) * | 2014-07-25 | 2014-11-26 | 中国科学院东北地理与农业生态研究所 | Soil crack parameter online measuring system and method for realizing soil crack parameter extraction by system |
| CN104165892B (en) * | 2014-07-25 | 2016-10-26 | 中国科学院东北地理与农业生态研究所 | Soil Crack Parameters on-line measurement system and use this system to realize soil Crack Parameters extracting method |
| CN106225736A (en) * | 2016-07-05 | 2016-12-14 | 中铁第五勘察设计院集团有限公司 | A kind of interior formwork detection device |
| CN107607397A (en) * | 2017-09-15 | 2018-01-19 | 重庆交通大学 | Defect inspection method and device |
| CN110360979A (en) * | 2019-07-04 | 2019-10-22 | 哈尔滨工业大学（深圳） | A kind of distress in concrete monitoring method and system |
| CN113155042A (en) * | 2021-04-13 | 2021-07-23 | 江苏大学 | Method for measuring thickness of transition zone of concrete internal interface |
| CN113155042B (en) * | 2021-04-13 | 2022-11-18 | 江苏大学 | Method for measuring thickness of transition area of concrete internal interface |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20140729 |
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| EXPY | Termination of patent right or utility model |