CN209485275U - A kind of crack dynamic change sensor based on digital image processing techniques - Google Patents
A kind of crack dynamic change sensor based on digital image processing techniques Download PDFInfo
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- CN209485275U CN209485275U CN201822269220.0U CN201822269220U CN209485275U CN 209485275 U CN209485275 U CN 209485275U CN 201822269220 U CN201822269220 U CN 201822269220U CN 209485275 U CN209485275 U CN 209485275U
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Abstract
The utility model discloses a kind of crack dynamic change sensor based on digital image processing techniques, including sensor body and two targets that structural body surface to be measured is arranged in, two targets are separately fixed at the two sides in crack to be measured；The sensor body includes casing and the optical lens that casing internal is arranged in, imaging sensor, key control unit and processing storage unit；Optical lens aims at target, and key control unit controls imaging sensor acquisition and obtains the image comprising the crack including all targets, and the data of acquisition are stored to handling in processing storage unit.The utility model obtains the image of the target of crack two sides setting using imaging sensor, the variation of the distance between target central point is calculated by image procossing, the crack of installed position is represented with respect to running parameter, with it is compact-sized, be easily installed, stability is good, measurement accuracy is high, time response is fast, the real-time online measuring suitable for works surface crack.
Description
Technical field
The utility model belongs to structure measurement field, and in particular to a kind of image knowledge for the measurement of large structure crack
Other noncontacting proximity sensor.
Background technique
Long-term work in the Large Infrastructure Projects such as bridge, tunnel, dam, by environmental attack, material aging and load
There is crack under, is one of disease the most serious.Due to acting on for a long time, crack may further be developed, so that drawing
Play catastrophic burst accident.In real time, for a long time, the change procedure in precise measurement crack, for the security evaluation, strong of main facilities
Kang Yunhang and prevention, which are reinforced, to be had a very important significance.
Currently, the method that crack measurement uses specifically includes that artificial periodic measurement, monitoring instrument inspection, installation tradition are split
Seam meter long term monitoring.These monitoring methods have the shortcomings that different, and manual detection efficiency is lower, and there are hidden danger for personnel safety.Instrument
Device inspection acquisition can only obtain data at that time, and low measurement accuracy.Conventional fracture meter is installed to need in crack both ends and structure
Owner's body is connected and fixed, when structural body is by external force, as bridge by vehicle, dam by hydraulic pressure when, shape will occur for structural body
Become, the sensor being fixed on structural body can also deform, and measurement accuracy is caused to decline.In field environment, temperature and humidity variation is
Inevitable factor, traditional sensor will also result in measurement accuracy since deformation occurs for the thermal instability of material itself
Decline.The development and variation in crack are related to real-time conditions, and traditional sensor response speed is slower, it is difficult to obtain dynamic
Monitoring data cannot reflect the situation of change in crack under specific condition.
With the development of CCD imaging technique and image processing techniques, the various sensors based on image recognition are surveyed in displacement
The fields such as amount, structure size detection are widely used.Application No. is a kind of 201010240543.2 Chinese patent " tunnels
The measurement method and device of road Lining Crack width " discloses the measurement method and device of a kind of tunnel lining crack width, packet
Digital camera acquisition crack image, image grayscale conversion, edge extracting, minimum distance calculation etc. are included, these utilize image recognition
Measurement accuracy, influence response speed, realized non-cpntact measurement, reduce external environment can be improved in measurement structure object surface crack,
It is to solve current measurement method effective means of problems.However, the method studied above primarily directed to pass through contact
Formula scanning or shooting at close range crack enlarged drawing collected.And in tunnel, for impalpable high-order crack image, hand
It is cumbersome to hold contact collection process.And the image of wide-long shot seriously affects image image quality to noise, light sensitive, makes
Subsequent image preprocessing becomes difficult complexity, has many image measuring methods to need at fracture using external light source light filling
Image can be obtained, furthermore crack is in the area occupation ratio in wide-long shot image than the ratio in the picture that contact acquires
Example is much smaller, large area background image complicated and changeable is remained, along with the defect of some edge detection methods, so that recent photograph
In roomy crack edge extracting method it is not applicable, a kind of suitable new method need to be found.Therefore, one kind energy in tunnel is studied
Convenient, quantitative, quickly and accurately measurement FRACTURE CHARACTERISTICS value image detecting method and detection system have become Tunnel Engineering knot
Structure field of non destructive testing there is an urgent need to one of.
Utility model content
The utility model proposes a kind of high-precision crack dynamic change sensor based on image recognition obtains works
The variation of the distance between target is calculated by image processing algorithm to replace in the optical imagery of target point at surface crack
The measurement of the change width in crack, with measurement accuracy is high, time response is fast, environmental suitability is strong, compact-sized, installation letter
Just, suitable for real-time, the long-term and long-range measurement of large structure surface crack.
The technical solution of the utility model is as follows:
A kind of crack dynamic change sensor based on digital image processing techniques, including sensor body and setting to
Two targets in measurement structure body surface face, two targets are separately fixed at the two sides in crack to be measured；The sensing
Device ontology includes that casing and the optical lens that casing internal is arranged in, imaging sensor, key control unit and processing storage are single
Member；Optical lens aims at target, and key control unit controls imaging sensor acquisition and obtains comprising the crack including all targets
Image, and by the data of acquisition store to processing storage unit in handle.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, the line between two targets is vertical
Trend in crack.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, the sensor body further includes
Processing result is transmitted in the data of distal end by remote communication unit, remote communication unit under the control of key control unit
The heart.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, the sensor body further includes
Power Management Unit, for imaging sensor, key control unit, processing storage unit and remote communication unit for automatically controlled
System.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, optical lens is zoom lens.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, casing is being fixed on the front in crack just
To the position of target.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, imaging sensor is CMOS sensing
Device.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, it is wireless that remote communication unit configures 4G
Network transmission module and wire transmission module.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, target is LED light or light-emitting diodes
Pipe, the spectral coverage that shines are near infrared band.
In the above-mentioned crack dynamic change sensor based on digital image processing techniques, casing is fixed on by fixed bracket
On the structural body surface of slit side.
The technical effect that the utility model has is as follows:
1, the utility model is respectively provided with two targets in the two sides in crack, obtains crack two sides using imaging sensor
The image of the target of setting is calculated the variation of the distance between target central point by image procossing, that is, represents installation site
The crack dynamic change parameter at place, have it is compact-sized, be easily installed, stability is good, measurement accuracy is high, time response is fast, fit
Real-time online measuring for works surface crack.
2, on the one hand the target of the utility model plays the role of crack mark, while being also used to the photograph of imaging sensor
It is bright, the illumination light filling of CCD camera is realized under dark background environment, overcome conventional image sensor need arbitrary source into
The defect of row illumination, since the power consumption of target is seldom, sensor can be applied for a long time in the environment of field unattended.Simultaneously
Target can also use the spectral coverage that shines for the LED light of near infrared band or light emitting diode, meet the different backgrounds such as daytime, night
Job requirement under light intensity does not interfere the day-to-day operation of measured target.
3, the utility model obtains the image of crack and target using focal optical lens, can be adjusted according to installation site
Camera lens makes imaging sensor obtain clearly target image and imaging region, has good live applicability.
4, the utility model use remote communication unit module, it can be achieved that sensor long-range control, data by 4G without
Gauze network or broadband finite element network reach data center, in the case where field environment is unattended can all weather operations, realize
Remote system management；Simultaneously based on DSP and ARM system exploitation key control unit and storage processing unit, so that entire system
It unites compact-sized, stable and reliable for performance, operational efficiency is high.
Detailed description of the invention
Crack sensors composition schematic diagram of Fig. 1 the utility model based on Digital image technology；
The target schematic layout pattern of Fig. 2 the utility model crack sensors；
Fig. 3 the utility model sensor body theory of constitution schematic diagram；
Fig. 4 is the utility model target image process flow diagram；
Appended drawing reference is as follows: 1-optical lens, 2-imaging sensors, 3-key control units, 4-processing storages are single
Member, 5-Power Management Unit, 6-remote communication units, 7-casings, 8-targets, 9-sensor bodies, 10-cracks；
11-structural body surfaces；12-target pedestals；13-fixed brackets；15-imaging regions.
Specific embodiment
As shown in Figure 1-3, the crack dynamic change sensor of the utility model, including sensor body 9 and two it is equivalent
Instead of deformed slits and the target of displacement 8.Sensor body 9 includes casing 7 and the optical lens 1 being arranged in inside casing 8, figure
As sensor 2, key control unit 3, processing storage unit 4, Power Management Unit 5 and remote communication unit 6.
Optical lens 1 aims at the target 8 of crack both sides setting, according to measurement accuracy and measurement request adjust zoom lens and
Sensor obtains clear target image at a distance from target.With this adjustment method, sensor is improved in the measurement of crack
Applicability.Imaging sensor 2 is obtained using cmos sensor, and pixel resolution has according to measurement Object selection, sensor
Compared with wide-measuring range and compared with high measurement accuracy.Key control unit 3 controls the image that imaging sensor 2 acquires target and crack,
And store data to processing storage unit 4, the processing processing of storage unit 4 obtains the distance between two targets 8 changing value,
And it is equivalent to the dynamic change parameter in crack 10, be locally displayed or transmits processing result by remote communication unit 6
Data center to distal end directly displays fracture parameters；It can also will be acquired according to field conduct situation by key control unit 3
Image data directly pass through after remote communication unit 6 is transmitted to the data center of distal end and carry out image procossing, calibration and crack
The calculating and display of dynamic parameter.
As shown in figure 3, key control unit 3 is the core cell of image recognition crack sensors, by DSP+ARM processor
Building, the acquisition module including sensor-triggered and timing control module, image data, for control image storage handle,
The implementation of teleinstruction and the transmission of data, integrated level is high, compact-sized, operation efficiency is high, reliable and stable, so that sensing
Utensil having time responds fast feature.
Storage unit 4 is handled under the control of key control unit 3, the image that imaging sensor 2 obtains is stored in
In flash storage, by 32 arm processors, every frame light spot image data in memory are read, and to image gray processing
The center of target is identified after processing, finally calculate and provide the changing value of target position, then the equivalent fracture width that provides
Dynamic change parameter.
Remote communication unit 6 is for image, the reception of the transmission of data and remote control commands.Remote communication unit 6 is logical
It crosses 4G mobile network or cable broadband network receives remote control commands, the data that processing is completed are sent in the data of distal end
The heart realizes the long-range measurement under field environment is unattended.
Power Management Unit 5, for imaging sensor 2, key control unit 3, processing storage unit 4 and telecommunication list
The power supply control of member 6.Power Management Unit 6 is instructed by remote communication unit 6 and is controlled, and requires setting and distribution according to time of measuring
The power supply of each power-up unit, reduces biosensor power consumption.
As shown in Fig. 2, two targets 8 are arranged on structural body surface to be measured, target 8 is arranged in structure according to FRACTURE CHARACTERISTICS
Object designated position, line between preferably two targets perpendicular to crack trend, due to the variation in crack on large structure
The expansion and contraction in crack are shown as, therefore the change width in crack can be equivalent to perpendicular to the target distance change of fracture strike
Value.Usual two targets 8 are separately positioned on the two sides in crack 10 to be measured by independent target pedestal 12；Target 8 is luminous
Diode or infrared LED, the spectral coverage that shines are near infrared band, meet job requirement under the different light intensity such as daytime, night, do not interfere
The day-to-day operation of measured target, suitable for the crack measurement of the structural bodies such as bridge, tunnel, heavy construction under various circumstances.
After target 8 is installed, fixed bracket 13 is mounted on to the side in crack 10, the fixing crack on fixed bracket 13
Sensor body 9, fixed bracket 13 have no effect on the variation in crack itself.By adjusting optical lens focal length, it is ensured that by crack
10 and two targets 8 be all contained in imaging region 15, and get a distinct image, access power supply and telecommunication cable, sensing
Device enters working condition, sends data terminal for crack measurement data.Sensor casing 7 is aluminium material, is used for package image
Sensor, Power Management Unit, key control unit, processing storage unit and remote communication unit, while light is fixed on casing 7
Learn camera lens and communication unit interface.
As shown in figure 4, the measuring process of fracture parameters include preset parameter, image data read, image gray processing processing,
Target spot center calculates, crack equivalent width calculates etc., according to above-mentioned step frame by frame to each of imaging sensor acquisition
After the image of frame carries out continuous processing calculating, the dynamic change value of fracture parameters is just obtained, and transfer data to the place of distal end
Terminal is managed, realizes unattended measurement.
Preset parameter is mainly the setting for realizing imaging sensor and target parameters；After the completion of preset parameter, arm processor
The 1st frame light spot image data in memory are read, and identify the center of target hot spot after handling image gray processing,
It finally calculates and provides two target position parameters.Then the light spot image data of 2-n frame are successively read, the frame hot spot is calculated
Corresponding two target position parameters, the image until completing whole hot spots, the last equivalent dynamic change for providing fracture width
Parameter.
The utility model is applied in tunnel, bridge surface crack real-time online measuring, and measurement accuracy reaches
0.01mm, response frequency 10Hz, it is compact-sized (70mm × 40mm × 40mm), there is weight for the safety monitoring of large structure
The meaning wanted.
Claims (10)
1. a kind of crack dynamic change sensor based on digital image processing techniques, it is characterised in that: including sensor body
(9) and setting is in two targets (8) of structural body surface (11) to be measured, and two targets (8) are separately fixed to be measured
The line between the two sides and two targets (8) of crack (10) is measured perpendicular to the trend in crack；The sensor body includes
Casing (7) and setting are deposited in the internal optical lens (1) of casing (7), imaging sensor (2), key control unit (3), processing
Storage unit (4) and remote communication unit (6)；Optical lens (1) aims at target (8), and key control unit (3) controls image sensing
Device (2) acquisition obtains the image comprising the crack including all targets (8), and the data of acquisition are stored to processing storage unit
(4) it is handled in.
2. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
The sensor body further includes remote communication unit (6), control of the remote communication unit (6) in key control unit (3)
Under, processing result is transmitted to the data center of distal end.
3. the crack dynamic change sensor according to claim 1 or 2 based on digital image processing techniques, feature exist
In: the sensor body further includes Power Management Unit (5), for imaging sensor (2), key control unit (3), place
Manage the power supply control of storage unit (4) and remote communication unit (6).
4. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
Optical lens (1) is zoom lens.
5. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
Casing (7) is fixed on the position of the front face target (8) in crack (10).
6. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
Imaging sensor (2) is cmos sensor.
7. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
Remote communication unit configures 4G wireless network transmission module and wire transmission module.
8. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, it is characterised in that:
Target (8) is LED light or light emitting diode.
9. the crack dynamic change sensor according to claim 8 based on digital image processing techniques, it is characterised in that:
The luminous spectral coverage of LED light or light emitting diode is near infrared band.
10. the crack dynamic change sensor according to claim 1 based on digital image processing techniques, feature exist
In: casing (7) passes through on the structural body surface (11) that fixed bracket (13) are fixed on slit side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822269220.0U CN209485275U (en) | 2018-12-29 | 2018-12-29 | A kind of crack dynamic change sensor based on digital image processing techniques |
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| CN201822269220.0U CN209485275U (en) | 2018-12-29 | 2018-12-29 | A kind of crack dynamic change sensor based on digital image processing techniques |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112288692A (en) * | 2020-10-16 | 2021-01-29 | 上海同禾工程科技股份有限公司 | Crack monitoring and management system and monitoring and management method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112288692A (en) * | 2020-10-16 | 2021-01-29 | 上海同禾工程科技股份有限公司 | Crack monitoring and management system and monitoring and management method |
| CN112288692B (en) * | 2020-10-16 | 2023-04-07 | 上海同禾工程科技股份有限公司 | Crack monitoring and management system and monitoring and management method |
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Address after: 710117 No. 30, Zhangba Road, high tech Zone, Xi'an, Shaanxi Patentee after: Shaanxi Traffic Control Engineering Technology Co.,Ltd. Patentee after: XI'AN LIANCHUANG XINGKE MEASUREMENT & CONTROL TECHNOLOGY Co.,Ltd. Address before: 710117 No. 30, Zhangba Road, high tech Zone, Xi'an, Shaanxi Patentee before: Shaanxi Jiaojiao Highway Engineering Test and Inspection Co.,Ltd. Patentee before: XI'AN LIANCHUANG XINGKE MEASUREMENT & CONTROL TECHNOLOGY Co.,Ltd. |