CN103808760B - Thermal excitation device for infrared thermal imaging nondestructive detection on concrete structure - Google Patents
Thermal excitation device for infrared thermal imaging nondestructive detection on concrete structure Download PDFInfo
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Abstract
The invention discloses a thermal excitation device for infrared thermal imaging nondestructive detection on a concrete structure. The device comprises an infrared radiation device, a boiler cradle, a boiler cradle rotation device and a boiler cradle lifting device, wherein the infrared radiation device comprises a radiation device array consisting of a plurality of ceramic radiation devices and a temperature control device electrically connected with the radiation device array; the radiation device array is fixed on the boiler cradle which is made of smooth stainless steel, and is connected with a moving component of the boiler cradle lifting device by the boiler cradle rotation device. According to the invention, a thermal source used by the technique of infrared imaging nondestructive detection on concrete not only is small in spatial gradient, high in time gradient, high in heating efficiency, and high in heating temperature controllable precision, but also can move conveniently and can be regulated in height and angle.
Description
Technical field
The present invention relates to a kind of heat exciter of the THERMAL IMAGING NONDESTRUCTIVE TESTING for defect in concrete.
Background technology
It is that civil engineering field is extremely paid close attention to seek a kind of lossless, quick, inexpensive, large-scale concrete census method
Problem, with very real meaning.IR Thermograph is exactly to be introduced into field of civil engineering in this case.
Research to infrared imagery technique application aspect, occurs in the U.S. of the sixties in 20th century earliest.Late 1970s,
There is scholar that the thermal losses of building, roof infiltration, enclosure wall defect are diagnosed using infrared imagery technique and the secondary table on road surface is searched
Planar defect etc..This technology is started late in China, and in early 1990s, just there is scholar in China by infrared imaging diagnostic techniquess
Combine with civil engineering, enter at aspects such as building thermal losses, construction material defect detection and external wall construction qualities
Preliminary applied research is gone.Infrared imagery technique is a kind of brand-new, sensitive detection method, and a kind of monitoring side well
Method, can be quick, noncontact, in large area scanning detectable substance surface the characteristics of which is important, and not damage check thing, as a result
Visual pattern, it is easy to accomplish automatization and real-time monitored.
Concentrate on what infrared imaging was obtained to the study hotspot of concrete nondestructive testing currently with infrared imagery technique
The improvement of thermal source.For thermal source this problem how is improved in the relevant detection process of concrete, domestic and international research worker is main
It is using powerful infrared pulse heater, infrared light irradiation, the ultrasonic thermal source such as infrared technique and high-energy flashlamp.Germany
Defect and fibre reinforced surface binder layer in concrete of Ch Maierhfer and Hwiggenhuaser et al. it is de-
During glue situation is detected, powerful infrared pulse heater is employed.Takahide Sakagami etc. are studied
Personnel are analyzed and researched to the leafing defect of inside concrete using infrared light irradiation, drawn defect in concrete with
The relation curve of the geometric size change of the depth of burying and defect.S Vallerand and X Maldague are in the red of PULSE HEATING
Under the conditions of outer thermal excitation, the quality of Statistics Method and neural network to the Inner Defect Testing of material is compared, it is indicated that
The applicable elements of various methods.Li Zhuoqiu, Huang Li, Wu Ying and Song Xianhui etc. in the case of energization, using carbon fiber reinforced concrete
Electrocaloric effect, to carrying out Infrared Non-destructive Testing containing the carbon fiber reinforced concrete defect body of precrack, be to optimize and assess electric heating
Infrared imaging detection scheme provides important numerical basis.Scientific research personnel both domestic and external has attempted different in detection process
Thermal source, but during using external heat source, the temperature field produced in detectable substance with centered on thermal source corresponding point, gradient to the periphery
The characteristics of successively decreasing, affects the accuracy of testing result.It is infrared imaging to find the New heat source that spatial gradient is little, time gradient is big
One main direction of studying of detection technique.
Following various test formats are had according to the mode difference infrared radiation detection of heat injection：
1. impulse radiation detection（PT：Pulsed Thermography）
Impulse radiation measurement process is：First testee is heated, then temperature change is measured.After heat injection
As thermal diffusion object temperature quickly changes, simultaneously because radiation and convection current cause the presence of heat loss, sub-surface defect to change
Thermal diffusion speed, forms the different temperature difference from around in fault location, completes to detect by measurement surface temperature.
2. rectangular pulse radiation detection（SPT：Square Pulsed Thermography）
In conventional impulse radiation detection, to high heat conductance object（Such as metal）The thermal excitation burst length only has several milliseconds,
And to lower thermal conductivity object（Such as plastics）The thermal pulse time then continues several seconds.But it is for concrete material, so short
Heat time heating time is often had not significant impact to measured object, so generally requiring using longer heat time heating time, such heat note
Entering the heat injection mode in mode and impulse radiation detection has larger different, and inside testee, heat exchange pattern is not yet
Together.
3. step radiation detection（SH：Step Heating）
In step radiation detection, the surface temperature change during radiant heating is monitored.It is mainly used in coating
Thickness sensitivity（Including laminated coating）, coating combined with substrate detection and composite construction detection etc..
4. chopped radiation detection（Lock-in）
Chopped radiation detection process be：The heat of periodic modulation is injected in surface of test piece（Such as the laser of Sine Modulated）,
The Temperature Distribution that mechanical periodicity is formed in test specimen is heat wave, and the temperature field to producing change is detected.Modulation refers to necessary
To output signal and reference-input signal（Such as the thermal excitation of periodic modulation）Between time relationship carry out accurate measurement.Adopting
It is to be realized by lock-in amplifier in the point measurement of laser pumping, can be obtained by computer disposal in whole audience mode of heating
To the image of two aspects of phase place and amplitude.Detection depth is inversely proportional to radiation modulation frequency, so high frequency modulated is mainly used in
Near surface is analyzed.
5. vibration radiation detection（Vibrothermography）
Vibration radiation detection falls within active detecting.Under outside mechanical vibration effect, in defect（Such as crack and layering）
Place can be converted into heat energy due to there is friction mechanism, so as to thermal excitation is produced in test specimen.
For concrete material, rectangular pulse radiation detection（SPT：Square Pulsed Thermography）It is
One than better suited method.
The content of the invention
It is an object of the invention to provide a kind of xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter, to solve
Not only spatial gradient is little, time gradient is big, the efficiency of heating surface is high for the thermal source that concrete infrared imaging Dynamic Non-Destruction Measurement is used, heating
The technical problems such as temperature-controllable precision finely, and can be moved easily, the equal scalable of elevation angle.
, in order to realize foregoing invention purpose, the technical scheme for being adopted is as follows for the present invention：
Xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter, the device include infrared radiation device, grate,
Grate rotary apparatuss, grate lowering or hoisting gear；The infrared radiation device includes the array of radiators of some ceramic radiator compositions
With the temperature control equipment being connected electrically；The array of radiators is fixed on grate, and the material of grate is that bright finish is stainless
Steel, and be connected with the dynamic component of grate lowering or hoisting gear by grate rotary apparatuss.
Infrared radiation device is divided into several warm areas, each warm area independent control temperature, and each warm area includes a band heat
The ceramic radiator of galvanic couple, other ceramic radiators of the warm area do not contain thermocouple；The power line of connection ceramic radiator makes
Use resistant to elevated temperatures wire.
Grate lowering or hoisting gear is connected the framework for being formed and is constituted by both sides lifting column and upper and lower reinforcing steel bar, vertical in lifting
Dynamic component is installed on post；The lifting column is the rail structure with tooth bar, and the dynamic component is to install cogged cunning
Road structure, wheel and rack coordinate, and lifting handle is provided with gear.
Grate rotary apparatuss include the rotating shaft and locking device for rotating axle that full angle rotates freely, and rotating shaft is symmetrically fixed on grate
Both sides, and dynamic component corresponding with lowering or hoisting gear realize rotate connection；Locking device for rotating axle by being fixed in rotating shaft, periphery
By the rotating disk of one group of locating slot, be fixed on disk peripheral coordinate the alignment pin of locking to constitute with locating slot.
Universal wheel is installed in the bottom of grate lowering or hoisting gear.
The invention has the beneficial effects as follows, homogeneous heating, the rapid, efficiency of heating surface that heats up are high, heating-up temperature controllable precision is fine,
Can full angle heating, spatial gradient is little, time gradient is big and can be moved easily, substantially increase the accuracy of detection, make coagulation
Reddle exterior-heat imaging non-destructive detection technique can be with practical.
Advantage of the present invention using ceramic radiator has：
1. the efficiency of heating surface is very high.Due to not lighting in heating process, electric energy is substantially all to be converted into heat energy, so compared with
Light source class thermal source is more efficient, energy-conservation.
2. heating-up temperature is fully controllable.The control accuracy of ceramic radiator is very fine, and the control accuracy phase of Halogen light
To rougher.
3. heated perimeter is highly uniform.If light source class thermal source constitutes array, need to carry out particular design to meet as far as possible
The uniformity of heating, but still inevitably there is temperature contrast on testee surface；And infrared radiation thermal source can be with non-
Often good solution homogeneity question.
4. life-span length.The life-span of ceramic radiator is generally more than 10000 hours, and the life-span of Halogen light is generally 5000
Hour.
For concrete NDT, 250W ceramic radiators maximum temperature can reach 400 DEG C, it is already possible to meet real
Border demand, now the average thermal power densities in the surface of ceramic radiator are 16kW/m2.Ceramic radiator is warming up to 200 DEG C and only needs
2 minutes are wanted, programming rate meets requirement.
Description of the drawings
Fig. 1 is the circuit theory diagrams of the present invention.
In figure, A is array of radiators, and B is temperature controller, and K is solid-state relay.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the side view of Fig. 1.
In figure, 1. array of radiators grate, 2. lifting column, 3 lifting handles, 4. rotating disk, 5. universal wheel, 6. removable
Unload reinforcing steel bar.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
A kind of xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter of the present invention, may refer to Fig. 2,
3, the device includes infrared radiation device, grate 1, grate rotary apparatuss, grate lowering or hoisting gear；The infrared radiation device bag
Include the array of radiators and the temperature control equipment being connected electrically of some ceramic radiator compositions；The array of radiators is consolidated
It is scheduled on grate, the material of grate 1 is bright finish rustless steel, and the dynamic component by grate rotary apparatuss with grate lowering or hoisting gear connects
Connect.
Infrared radiation device is divided into several warm areas, each warm area independent control temperature, and each warm area includes a band heat
The ceramic radiator of galvanic couple, other ceramic radiators of the warm area do not contain thermocouple；The power line of connection ceramic radiator makes
Use resistant to elevated temperatures wire.
Grate lowering or hoisting gear is connected the framework for being formed and is constituted by both sides lifting column 2 and upper and lower reinforcing steel bar 6, in lifting
Dynamic component is installed on column 2；The lifting column 2 is the rail structure with tooth bar, and the dynamic component is to be provided with gear
Slideway structure, wheel and rack coordinate, lifting handle 3 is installed on gear.
Grate rotary apparatuss include the rotating shaft and locking device for rotating axle that full angle rotates freely, and rotating shaft is symmetrically fixed on grate
Both sides, and dynamic component corresponding with lowering or hoisting gear realize rotate connection；Locking device for rotating axle by being fixed in rotating shaft, periphery
By the rotating disk 4 of one group of locating slot, be fixed on disk peripheral coordinate the alignment pin of locking to constitute with locating slot.
Universal wheel is installed in the bottom of grate lowering or hoisting gear.
Referring to Fig. 1, infrared radiation device is divided into several warm areas, and each warm area independent control temperature, each warm area are included
One ceramic radiator with thermocouple, other ceramic radiators of the warm area do not contain thermocouple；Connection ceramic radiator
Power line uses resistant to elevated temperatures wire.Universal wheel 5 is installed in the bottom of grate.
Embodiment above facilitates a better understanding of the present invention, but limits the present invention.Experiment in following embodiments
Method, if no special instructions, is conventional method.
Detection should be carried out by following procedure：
1. record date, time, climate condition（Situations such as including weather, wind-force, temperature, air humidity, sunshine）；
2. detection object is divided into into different detection zones, selects appropriate location to lay heater, setting in order
Heating-up temperature simultaneously makes heater in normal operating conditions, and following safety requirements is should be noted that during heating：
1）Using bright and clean aluminium sheet or rustless steel reflecting plate by heater surrounding shade：Infrared radiant heating system grate
Main member is made up of stainless steel metal material, and in ceramic infrared radiation device laser heating running, grate is inevitable
Can be heated up by radiant heating.When being heated using high power infrared radiator, grate skin temperature may be up to 300 DEG C or so.Therefore,
Protective measure should be taken to avoid the directly contact of human body and high-temperature metal grate.It is proposed with bright and clean aluminium sheet or rustless steel reflecting plate
By heating system surrounding shade, this can prevent the object on the outside of grate by unnecessary heating, while improving energy utilization rate；
2）Using protection tools such as asbestos gloves；
3）Exclude other heating sources as far as possible to disturb.
3. heater is closed and remove, and is selected appropriate location to lay infrared thermoviewer, and infrared thermoviewer is made in just
Normal working condition；
4. shoot infrared image and preserve.
5. heater is moved to into next sense partitions, repeat step 2~4。
The critical piece of grate is made using bright finish rustless steel.Intensity is high, can support ceramic red inside grate
The weight loading of external radiation device;The coefficient of expansion under high-temperature situation is relatively low, and bright stainless steel surfaces reflect most
Infrared-ray, effectively reduces thermal losses of the infrared radiant heating system in heating process.Therefore infrared radiant heating system
Grate has energy-conservation, stabilized structure, thermal deformation little, and corrosion resistant feature under high temperature.
Heating system is divided into into several warm areas, each warm area can be with independent control temperature, and each warm area includes a band
The ceramic radiator of thermocouple, other ceramic radiators do not contain thermocouple, and circuit-line is as shown in figure 1, connection ceramics are infrared
The power line of beta radiation device uses resistant to elevated temperatures wire.
Practical application of bridge for convenience, the support of device include the functions such as hand-operated lifting, rotation, walking, as shown in Fig. 2
The tooth bar being mutually twisted by crank shake realizes the lifting of grate, realizes that by bearing and rotating disk the full angle of grate freely revolves
Turn, while installing universal wheel to facilitate walking in the bottom of support.
Claims (3)
1. a kind of xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter, is characterized in that, the device includes infrared spoke
Injection device, array of radiators grate, grate rotary apparatuss, grate lowering or hoisting gear；The infrared radiation device includes some ceramics
The array of radiators and the temperature control equipment being connected electrically of irradiator composition；The array of radiators is fixed on irradiator
On array grate, the material of array of radiators grate is bright finish rustless steel, and by grate rotary apparatuss and grate lowering or hoisting gear
Dynamic component connection；
Infrared radiation device is divided into several warm areas, each warm area independent control temperature, and each warm area includes a band thermocouple
Ceramic radiator, other ceramic radiators of the warm area do not contain thermocouple；The power line of connection ceramic radiator is using resistance to
The wire of high temperature, ceramic radiator are warming up to 200 DEG C and only need to 2 minutes；
Grate lowering or hoisting gear is connected the framework for being formed and is constituted by both sides lifting column and upper and lower reinforcing steel bar, on lifting column
Dynamic component is installed；The lifting column is the rail structure with tooth bar, and the dynamic component is to install cogged slideway knot
Structure, wheel and rack coordinate, and lifting handle is provided with gear.
2. a kind of xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter according to claim 1, its feature
It is that grate rotary apparatuss include the rotating shaft and locking device for rotating axle that full angle rotates freely, rotating shaft is symmetrically fixed on irradiator battle array
The both sides of row grate, and dynamic component corresponding with lowering or hoisting gear realizes rotation connection；Locking device for rotating axle is by being fixed in rotating shaft
, periphery by one group of locating slot rotating disk, be fixed on disk peripheral coordinate the alignment pin of locking to constitute with locating slot.
3. a kind of xoncrete structure THERMAL IMAGING NONDESTRUCTIVE TESTING heat exciter according to claim 1, its feature
It is that universal wheel is installed in the bottom of grate lowering or hoisting gear.
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| CN104655432A (en) * | 2014-12-08 | 2015-05-27 | 广州林骏汽车内饰件有限公司 | Multi-directional heat-resisting irradiation local temperature control detection device |
| CN104698035B (en) * | 2015-03-22 | 2018-02-23 | 何赟泽 | A kind of microwave step thermal imaging detection and chromatography imaging method and system |
| CN105628739A (en) * | 2015-12-25 | 2016-06-01 | 黑龙江科技大学 | Robot laser infrared nondestructive testing device for large workpiece and flaw detection method |
| US10191014B2 (en) * | 2016-08-23 | 2019-01-29 | The Boeing Company | System and method for nondestructive evaluation of a test object |
| GB201711412D0 (en) * | 2016-12-30 | 2017-08-30 | Maxu Tech Inc | Early entry |
| CN107085012A (en) * | 2017-06-22 | 2017-08-22 | 鲁东大学 | A kind of monitoring device for extent of steel corrosion in armored concrete |
| CN108444936B (en) * | 2018-03-27 | 2020-05-22 | 重庆交通大学 | Nondestructive testing system and method for concrete filled steel tube void |
| BR102018012268B1 (en) * | 2018-06-15 | 2021-09-14 | Universidade Federal De Santa Catarina -Ufsc | SYSTEM FOR INSPECTING A REPAIR OR JOINT OF COMPOUND MATERIAL APPLIED TO A STRUCTURE |
| CN109211832B (en) * | 2018-09-28 | 2021-03-26 | 交通运输部公路科学研究所 | Nondestructive testing method for concrete inner cavity under low heat input condition |
| CN109813745A (en) * | 2019-01-18 | 2019-05-28 | 中国科学院合肥物质科学研究院 | Non-destructive measuring method based on infrared thermal imaging on-line measurement hyperconductive cable back twist angle |
| CN114018705B (en) * | 2021-11-08 | 2022-05-24 | 水利部交通运输部国家能源局南京水利科学研究院 | Concrete free fracture overall process control visualization tracking test system and method |
| CN114494245B (en) * | 2022-03-31 | 2022-07-26 | 广东省有色工业建筑质量检测站有限公司 | Image identification method for detecting air tightness of wall structure hole |
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| CN1401989A (en) * | 2002-09-20 | 2003-03-12 | 武汉理工大学 | Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor |
| JP2005172664A (en) * | 2003-12-12 | 2005-06-30 | Takenaka Doboku Co Ltd | Method and device for determining soundness of concrete structure by infrared method |
| CN102605505B (en) * | 2012-04-09 | 2014-04-02 | 天津工业大学 | Drawing and heat-setting device |
| CN203720127U (en) * | 2013-12-12 | 2014-07-16 | 交通运输部公路科学研究所 | Thermal excitation device applicable to infrared thermal imaging nondestructive inspection of concrete structures |
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