CN106248734A - The device and method of auxiliary excitation in a kind of infrared thermal imaging detection technique - Google Patents
The device and method of auxiliary excitation in a kind of infrared thermal imaging detection technique Download PDFInfo
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- CN106248734A CN106248734A CN201610783704.XA CN201610783704A CN106248734A CN 106248734 A CN106248734 A CN 106248734A CN 201610783704 A CN201610783704 A CN 201610783704A CN 106248734 A CN106248734 A CN 106248734A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
Abstract
The invention discloses the device and method of auxiliary excitation in a kind of infrared thermal imaging detection technique, principle according to active detection infrared thermal imaging detection technique, it it not heating when detecting, but utilize external source that testee is lowered the temperature, break the original thermal equilibrium state of testee, cause heat to flow at interior of articles.In the presence of inside is defective, heat transfer process is disturbed, and then changes the Temperature Distribution of material surface, is recorded or observes this temperature anomaly by scanning and realize defects detection.
Description
Art
The present invention relates to the device and method of a kind of Non-Destructive Testing auxiliary excitation, particularly relate to a kind of infrared thermal imaging inspection
The device and method of auxiliary excitation in survey technology.
Background technology
Infrared thermography is a kind of lossless detection method grown up under the promotion of infrared thermal imaging technique.According to
The second law of thermodynamics, when the non-uniform temperature of an object itself, heat will flow to low-temperature region from high-temperature area.
Hot-fluid is during conduction and diffusion, owing to the running status of tested object and defect are to the obstruction of conduction of heat or quickening,
So-called " hot-zone " and " cold-zone " can be formed, and then show with the form that material surface temperature is uneven, change body surface
Temperature Distribution form.With the theory of infra-red radiation as foundation, use infrared radiometer device and the method for analysis, observe material
Material, component and the surface temperature distribution of other target objects, thus a kind of Dynamic Non-Destruction Measurement realizing defects detection is exactly red
Outer detection.Without contacting measurand, the thermal balance caused because of thermo-contact is there is not, has and do not disturb original temperature in cause when measuring
Degree field, applied range, the advantages such as thermometric velocity efficiency height, wide ranges, inertia error are little, infrared detection obtains in detecting at the scene
The attention widely obtained.
Infrared thermal imaging can be divided into two big classes by detection mode: passive type and active.Passive type detection is then to utilize work
Part self and the temperature contrast of surrounding, detect inside workpiece in the heat exchanging process of workpiece for measurement and surrounding
Defect, is used for the operating quality control of equipment.Active detection is to utilize external heat source to measured object when detecting
Body injects heat, breaks the original thermal equilibrium state of testee, causes heat to flow at interior of articles.Deposit when inside is defective
Time, heat transfer process is disturbed, so change material surface Temperature Distribution, recorded by scanning or observe this temperature
Extremely defects detection is realized.
The external heat source of active detection mainly has thermal current, flash lamp, hot water, laser, ultrasound wave, microwave and electric current
Deng.Flash of light and laser pumping, all by irradiating test specimen surface, inject heat in test specimen, can realize remote noncontact inspection
Survey, but the efficiency of heating surface is low；Ultrasonic and electric current heating then can realize from surface to internal three-dimensional heating, and the efficiency of heating surface is higher, inspection
Degree of testing the speed faster, and due to the mechanical friction of fault location and the disturbance of electric current, can directly heat defect so that defect and peripheral region
The contrast in territory is higher.But ultrasonic action need to use couplant, for contact measurement, limits its range of application.Electric current swashs
Encourage and can use contact (electromagnetic conductive thermal imaging) and non-contact thermal (current vortex thermal imaging), but non-contact thermal is by line
The impact of circle size and shape there will be blind area.
Summary of the invention
It is an object of the invention to overcome the deficiency of prior art, it is provided that in a kind of infrared thermal imaging detection technique, auxiliary swashs
The device and method encouraged, according to the principle of active detection infrared thermal imaging detection technique, is not heating when detecting, and
It is to utilize external source that testee is lowered the temperature, breaks the original thermal equilibrium state of testee, cause heat at interior of articles
Flowing.In the presence of inside is defective, heat transfer process is disturbed, and then changes the Temperature Distribution of material surface, by sweeping
Trace to record or observe this temperature anomaly and realize defects detection.
The technical solution adopted for the present invention to solve the technical problems is: in a kind of infrared thermal imaging detection technique, auxiliary swashs
The device encouraged, including low-temperature receiver, cryogen nozzle, thermal infrared imager, synchronizer, it is characterised in that:
Described low-temperature receiver is made up of solid carbon dioxide or liquid nitrogen；Described low-temperature receiver is connected with described cryogen nozzle by pipeline；Institute
State low-temperature receiver to be made up of the pressure vessel that heat insulation effect is good；
Described cryogen nozzle is connected with described low-temperature receiver by pipeline, and described cryogen nozzle electrically connects with described synchronizer, by same
Step equipment controls moment and the duration that nozzle is opened；
Described synchronizer electrically connects with described thermal infrared imager, and described synchronizer electrically connects with described cryogen nozzle, described
Synchronizer sends control signal, controls moment and duration that described cryogen nozzle is opened, utilizes low-temperature receiver to lower the temperature testee,
Break the original thermal equilibrium state of testee, cause heat to flow at interior of articles.Described synchronizer sends control signal,
Controlling described thermal infrared imager to carry out being continuously shot or being interrupted shooting, in the presence of inside is defective, heat transfer process is disturbed
Dynamic, and then the Temperature Distribution of change material surface, realize defects detection by recording or observing this temperature anomaly；
Described thermal infrared imager electrically connects with described synchronizer, by synchronizer control, is continuously shot testee
Or it is interrupted shooting.
A kind of auxiliary excitation method in infrared thermal imaging detection technique, uses said apparatus, it is characterised in that: include as follows
Step,
The most described synchronizer sends control signal, controls moment and duration that described cryogen nozzle is opened, utilizes low-temperature receiver to quilt
Survey object is lowered the temperature, and breaks the original thermal equilibrium state of testee, causes heat to flow at interior of articles；
B., after step a completes, described synchronizer sends control signal, control described thermal infrared imager carry out being continuously shot or
It is interrupted shooting；
C. in the presence of there is discontinuity inside, heat transfer process is hindered, and then changes the Temperature Distribution of material surface,
Defects detection is realized by record or observation temperature anomaly.
During actually detected, by mobile described cryogen nozzle in the relative position on testee surface, repeat step
A, step b, step c, can realize the detection process to whole testee.
The invention has the beneficial effects as follows, auxiliary excitation device and method in a kind of infrared thermal imaging detection technique, according to master
The principle of dynamic formula detection infrared thermal imaging detection technique, is not heating when detecting, but utilizes external source to tested
Object is lowered the temperature, and breaks the original thermal equilibrium state of testee, causes heat to flow at interior of articles.When internal defective existence
Time, heat transfer process is disturbed, and then changes the Temperature Distribution of material surface, is recorded by scanning or to observe this temperature different
Often realize defects detection.The present invention uses the motivational techniques of low-temperature receiver, it is not necessary to couplant, it is possible to achieve non-cpntact measurement, cryogen pair
Human body is harmless, pollution-free to air, and launching efficiency is high, and cooling is uniformly.
Below in conjunction with embodiment, the present invention is described in further detail, but a kind of infrared thermal imaging of present invention detection skill
In art, auxiliary excitation device and method is not limited to embodiment.
Accompanying drawing explanation
The present invention is further described for middle embodiment.
Fig. 1 be the embodiment of the present invention a kind of infrared thermal imaging detection technique in the apparatus structure block diagram of auxiliary excitation.
In figure, 1. synchronizer, 2. low-temperature receiver, 3. cryogen nozzle, 4. thermal infrared imager, 5. testee.
Detailed description of the invention
Embodiment, as it is shown in figure 1, the device of auxiliary excitation in a kind of infrared thermal imaging detection technique, including synchronizer
1, low-temperature receiver 2, cryogen nozzle 3, thermal infrared imager 4, it is characterised in that:
Described low-temperature receiver 2 can be made up of solid carbon dioxide or liquid nitrogen；Described low-temperature receiver 2 is by pipeline and described cryogen nozzle 3
Connect；Described low-temperature receiver 2 is made up of the pressure vessel that heat insulation effect is good；
Described cryogen nozzle 3 is connected with described low-temperature receiver 2 by pipeline, and described cryogen nozzle 3 electrically connects with described synchronizer 1,
Moment and the duration that nozzle is opened is controlled by synchronizer 1；
Described synchronizer 1 electrically connects with described thermal infrared imager 4, and described synchronizer 1 electrically connects with described cryogen nozzle 3,
Described synchronizer 1 sends control signal, controls moment and duration that described cryogen nozzle 3 is opened, utilizes low-temperature receiver 2 to measured object
Body 5 is lowered the temperature, and breaks the original thermal equilibrium state of testee 5, causes heat to flow at interior of articles.Described synchronizer 1
Going out control signal, control described thermal infrared imager 4 and carry out being continuously shot or being interrupted shooting, in the presence of inside is defective, heat passes
The process of leading is disturbed, and then changes the Temperature Distribution of material surface, realizes defect by recording or observing this temperature anomaly
Detection；
Described thermal infrared imager 4 electrically connects with described synchronizer 1, is controlled by synchronizer 1, carries out testee 5 continuously
Shooting or interruption shooting.
Embodiment one, a kind of method of auxiliary excitation in infrared thermal imaging detection technique, with metal material infrared thermal imaging
As a example by detection, comprise the steps,
The most described synchronizer 1 sends control signal, controls moment and duration that described cryogen nozzle 3 is opened, utilizes low-temperature receiver 2
Testee 5 is lowered the temperature, breaks the original thermal equilibrium state of testee 5, cause heat to flow at interior of articles；
B. after step a completes, described synchronizer 1 sends control signal, controls described thermal infrared imager 4 and is continuously shot
Or it is interrupted shooting；
C. in the presence of there is discontinuity inside, heat transfer process is hindered, and then changes the Temperature Distribution of material surface,
Defects detection is realized by record or observation temperature anomaly；
During actually detected, by mobile described cryogen nozzle 3 in the relative position on testee 5 surface, repetition step a,
Step b, step c, can realize the detection process to whole testee 5.
Embodiment two, a kind of method of auxiliary excitation in infrared thermal imaging detection technique, become with nonmetallic materials infra-red heat
As a example by detection, comprise the steps,
The most described synchronizer 1 sends control signal, controls moment and duration that described cryogen nozzle 3 is opened, utilizes low-temperature receiver 2
Testee 5 is lowered the temperature, breaks the original thermal equilibrium state of testee 5, cause heat to flow at interior of articles；
B. after step a completes, described synchronizer 1 sends control signal, controls described thermal infrared imager 4 and is continuously shot
Or it is interrupted shooting；
C. in the presence of there is discontinuity inside, heat transfer process is hindered, and then changes the Temperature Distribution of material surface,
Defects detection is realized by record or observation temperature anomaly.
During actually detected, by mobile described cryogen nozzle 3 in the relative position on testee 5 surface, repeat step
Rapid a, step b, step c, can realize the detection process to whole testee 5.
Above-described embodiment is only used for further illustrating auxiliary excitation in a kind of infrared thermal imaging detection technique of the present invention
Device and method, but the invention is not limited in embodiment, above example is made by every technical spirit according to the present invention
Any simple modification, equivalent variations and modification, each fall within the protection domain of technical solution of the present invention.
Claims (2)
1. a device for auxiliary excitation in infrared thermal imaging detection technique, including low-temperature receiver, cryogen nozzle, thermal infrared imager, with
Step equipment, it is characterised in that:
Described low-temperature receiver is made up of solid carbon dioxide or liquid nitrogen；Described low-temperature receiver is connected with described cryogen nozzle by pipeline；Institute
State low-temperature receiver to be made up of the pressure vessel that heat insulation effect is good；
Described cryogen nozzle is connected with described low-temperature receiver by pipeline, and described cryogen nozzle electrically connects with described synchronizer, by same
Step equipment controls moment and the duration that nozzle is opened；
Described synchronizer electrically connects with described thermal infrared imager, and described synchronizer electrically connects with described cryogen nozzle, described
Synchronizer sends control signal, controls moment and duration that described cryogen nozzle is opened, utilizes low-temperature receiver to lower the temperature testee,
Break the original thermal equilibrium state of testee, cause heat to flow at interior of articles；Described synchronizer sends control signal,
Controlling described thermal infrared imager to carry out being continuously shot or being interrupted shooting, in the presence of inside is defective, heat transfer process is disturbed
Dynamic, and then the Temperature Distribution of change material surface, realize defects detection by recording and observing this temperature anomaly；
Described thermal infrared imager electrically connects with described synchronizer, by synchronizer control, is continuously shot testee
Or it is interrupted shooting.
2. an auxiliary excitation method in infrared thermal imaging detection technique, uses the device described in claim 1, and its feature exists
In: comprise the steps,
The most described synchronizer sends control signal, controls moment and duration that described cryogen nozzle is opened, utilizes low-temperature receiver to quilt
Survey object is lowered the temperature, and breaks the original thermal equilibrium state of testee, causes heat to flow at interior of articles；
B., after step a completes, described synchronizer sends control signal, control described thermal infrared imager carry out being continuously shot or
It is interrupted shooting；
C. in the presence of there is discontinuity inside, heat transfer process is hindered, and then changes the Temperature Distribution of material surface,
Defects detection is realized by record or observation temperature anomaly.
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Cited By (6)
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| CN108226223A (en) * | 2017-12-25 | 2018-06-29 | 山西戴德测控技术有限公司 | One kind is based on infrared thermal imaging steel wire rope on-line measuring device |
| CN110174440A (en) * | 2019-04-25 | 2019-08-27 | 杭州市特种设备检测研究院 | A kind of high-temperature metal pipeline welded joint incomplete penetration defect online test method |
| CN110672663A (en) * | 2019-10-18 | 2020-01-10 | 南京林业大学 | Method for detecting sleeve grouting defects based on temperature field change |
| CN112198192A (en) * | 2020-09-07 | 2021-01-08 | 江苏理工学院 | Infrared image detection device and detection method for fan welding assembly |
| CN112285108A (en) * | 2020-10-20 | 2021-01-29 | 深圳技术大学 | Portable noble metal interlaminar adulteration nondestructive testing device based on infrared thermal imaging technology |
| CN113933349A (en) * | 2021-09-24 | 2022-01-14 | 长沙学院 | Thermal imaging detection method, system and equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226223A (en) * | 2017-12-25 | 2018-06-29 | 山西戴德测控技术有限公司 | One kind is based on infrared thermal imaging steel wire rope on-line measuring device |
| CN110174440A (en) * | 2019-04-25 | 2019-08-27 | 杭州市特种设备检测研究院 | A kind of high-temperature metal pipeline welded joint incomplete penetration defect online test method |
| CN110672663A (en) * | 2019-10-18 | 2020-01-10 | 南京林业大学 | Method for detecting sleeve grouting defects based on temperature field change |
| CN112198192A (en) * | 2020-09-07 | 2021-01-08 | 江苏理工学院 | Infrared image detection device and detection method for fan welding assembly |
| CN112285108A (en) * | 2020-10-20 | 2021-01-29 | 深圳技术大学 | Portable noble metal interlaminar adulteration nondestructive testing device based on infrared thermal imaging technology |
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| CN113933349A (en) * | 2021-09-24 | 2022-01-14 | 长沙学院 | Thermal imaging detection method, system and equipment |
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Application publication date: 20161221 |