CN113866219A - Ultrasonic infrared thermal imaging detection method and system for microcracks of gas cylinder liner - Google Patents
Ultrasonic infrared thermal imaging detection method and system for microcracks of gas cylinder liner Download PDFInfo
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- CN113866219A CN113866219A CN202111008245.5A CN202111008245A CN113866219A CN 113866219 A CN113866219 A CN 113866219A CN 202111008245 A CN202111008245 A CN 202111008245A CN 113866219 A CN113866219 A CN 113866219A
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000001931 thermography Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 238000003331 infrared imaging Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 50
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 229920000049 Carbon (fiber) Polymers 0.000 description 7
- 239000004917 carbon fiber Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 230000003014 reinforcing effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 238000003384 imaging method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
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- G—PHYSICS
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- 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
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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
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention relates to an ultrasonic infrared thermal imaging detection method and system for microcracks of an inner container of a gas cylinder, wherein the system structure comprises a laser excitation component and an infrared imaging thermal component; the laser excitation assembly comprises a laser, a lifting mechanism, a prism and a cylindrical lens; the laser beam emitted by the laser changes direction through the triangular prism, forms a linear light source through the cylindrical lens, and then irradiates the surface of the inner container of the gas cylinder to be detected; the lifting mechanism is used for continuously adjusting the height of the laser to continuously change the position of the linear light source; the infrared imaging thermal assembly comprises a miniature thermal infrared imager which is arranged inside the gas cylinder to be detected and used for collecting thermal image data of the surface of the inner container. The detection method controls the position of the laser line light source to change continuously, enhances the intensity of ultrasonic surface waves on the surface of the inner container of the detected gas bottle, promotes the local temperature rise of cracks formed by the surface closure of the inner container, is beneficial to extracting thermal image data of the surface of the inner container with better contrast, is beneficial to identifying smaller crack damage, and has accurate detection result.
Description
Technical Field
The invention relates to the technical field of nondestructive testing of special equipment, in particular to an ultrasonic infrared thermal imaging detection method and system for microcracks of an inner container of a gas cylinder.
Background
The carbon fiber wound gas cylinder is important special storage and transportation equipment for compressed gases such as hydrogen and natural gas, and has the advantages of high strength, light weight, good fatigue resistance, more stored gases and the like. The carbon fiber wound gas cylinder is complex in production process, is used as a movable pressure container, is susceptible to adverse factors such as vibration, environmental corrosion, collision impact and the like in the use and service process, so that various damages inevitably occur in the production, transportation and use processes of the gas cylinder, potential safety risks are caused, and periodic nondestructive detection is required to be performed on the gas cylinder.
The inner container microcrack is one of damage types appearing in the carbon fiber winding gas cylinder use, and the formation of inner container microcrack can destroy the gas tightness of gas cylinder inner container, and then causes the influence to the safety in utilization of gas cylinder. The reason for its formation is because the gas cylinder need constantly inflate and lose heart at its in-service process, and the gas cylinder inner bag can receive the effect of long-term alternating load, therefore can produce fatigue damage and further can form the microcrack, and its structure is more slight, can be in the state of opening and shutting when the gas cylinder is aerifyd, and the gas cylinder is closed again after losing heart.
According to the actual condition of the detection of the inner container of the gas cylinder, the detection of the inner container of the gas cylinder needs to be carried out after the inner container of the gas cylinder loses air, namely, the microcrack in a closed state needs to be detected. The detection resolution of the existing nondestructive detection technology such as ray, ultrasonic and acoustic emission and the like is difficult to meet the detection requirement of the micro closed crack of the liner, and special equipment and a method for quickly and effectively detecting the microcrack of the liner of the carbon fiber wound gas cylinder are absent at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the ultrasonic infrared thermal imaging detection method and the ultrasonic infrared thermal imaging detection system for the microcracks of the inner container of the gas cylinder, and the method and the system have better sensitivity for detecting the microcracks of the carbon fiber inner container.
The technical scheme adopted by the invention is as follows:
an ultrasonic infrared thermal imaging detection system for microcracks of a gas cylinder liner comprises a laser excitation assembly and an infrared imaging thermal assembly;
the laser excitation assembly comprises a laser, a lifting mechanism, a prism and a cylindrical lens, the laser is arranged outside the gas cylinder to be detected, and the prism and the cylindrical lens are both arranged inside the gas cylinder to be detected;
the laser beam emitted by the laser changes direction through the triangular prism, forms a linear light source through the cylindrical lens, then irradiates the surface of the liner of the gas cylinder to be detected, and excites the surface of the liner to generate ultrasonic surface waves;
the lifting mechanism is used for continuously adjusting the height of the laser, so that the position of the linear light source is continuously changed, and the surface of the liner is excited to generate ultrasonic surface waves with enhanced intensity;
the infrared imaging thermal assembly comprises a miniature thermal infrared imager which is arranged inside the gas cylinder to be detected and used for collecting thermal image data of the surface of the inner container.
The further technical scheme is as follows:
the lifting mechanism has the structure that:
the lifting platform is connected with a lead screw nut component driven by a motor and moves along the vertical direction.
A detection method of an ultrasonic infrared thermal imaging detection system utilizing microcracks of a gas cylinder liner comprises the following steps:
step one, arranging a laser outside a gas cylinder to be detected, and arranging a triangular prism, a cylindrical lens and a miniature thermal infrared imager inside the gas cylinder to be detected;
starting a laser, generating a laser beam, changing a light path through a prism, forming a linear light source through a cylindrical lens, irradiating the linear light source on the surface of the liner, and exciting an ultrasonic surface wave which can be transmitted along the surface on the surface of the liner;
controlling the laser to continuously move along the height direction, and controlling the laser beam to be in the refraction range of the triangular prism, so that the position of the linear light source is continuously changed, and the ultrasonic surface wave with enhanced intensity is excited on the surface of the liner;
and thirdly, acquiring continuously changed thermal image data of the surface of the inner container by using the miniature thermal infrared imager, and processing the acquired data by using a computer to obtain crack information of the surface of the inner container.
The further technical scheme is as follows:
the laser moves at a uniform speed along the height direction.
The invention has the following beneficial effects:
according to the invention, the position of the laser line light source is continuously changed through the laser excitation assembly, the intensity of ultrasonic surface waves on the surface of the inner container of the gas cylinder to be detected is enhanced, the local temperature rise of the inner container surface closed into cracks is promoted, the extraction of thermal image data of the inner container surface with better contrast is facilitated, the identification of smaller crack damage is facilitated, and the accuracy of the detection result is improved.
The laser is controlled to lift by the lifting structure, the moving range and the speed are controllable, the ultrasonic surface wave with strong interference superposition effect is formed by forming the movable linear light source, the operation is convenient, the excitation effect is good, and the crack detection on the whole surface of the liner is favorably realized.
Drawings
Fig. 1 is a schematic view of the overall structure of the detection system.
FIG. 2 is a schematic diagram of a light source for generating a laser array line.
Fig. 3 is a schematic view of a laser lift table.
Fig. 4 is a schematic structural diagram of a gas cylinder support.
FIG. 5 is a flow chart of a detection method.
In the figure: 1. a computer; 2. a cable wire; 3. a gas bottle to be detected; 4. a prism; 5. a miniature thermal infrared imager; 6. a carbon fiber layer; 7. an inner container; 8. a lifting mechanism; 9. a laser; 10. a cylindrical lens; 11. a gas cylinder support; 12. a support plate; 13. a stepping motor; 14. a coupling; 15. a ball nut; 16. a lifting platform; 17. reinforcing the triangular plate; 18. a base plate; 19. a ball screw; 20. a gas cylinder holder; 21. square tube base.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The ultrasonic infrared thermal imaging detection system for the microcracks of the gas cylinder liner comprises a laser excitation assembly and an infrared imaging thermal assembly;
referring to fig. 1, the laser excitation assembly includes a laser 9, a lifting mechanism 8, a prism 4 and a cylindrical lens 10, the laser 9 is disposed outside the gas cylinder 3 to be measured, and both the prism 4 and the cylindrical lens 10 are disposed inside the gas cylinder 3 to be measured;
a laser beam emitted by a laser 9 is sequentially emitted to the surface of the inner container 7 of the gas bottle 3 to be detected through the triangular prism 4 and the cylindrical lens 10 to form a linear light source;
the lifting mechanism 8 is used for continuously adjusting the height of the laser 9, so that the linear light source continuously changes, and the surface of the liner 7 is excited to generate ultrasonic surface waves;
referring to fig. 2, the path of the linear light source is shown as the path of the linear light source when the laser 9 moves from top to bottom, the dotted line in the figure represents the path of the linear light source generated during the previous moving processes, the solid line represents the path of the linear light source at the current position, and the linear light source finally irradiates the inner surface of the inner container 7.
As can be seen from fig. 2, the optical path changes in a translational manner with the change in the incident height of the laser 9, and the change in the optical path expands the incident range, which is advantageous for enhancing the intensity of the ultrasonic surface wave on the surface of the inner container 7.
As an embodiment, referring to fig. 1, the lifting mechanism 8 has a structure:
comprises an elevating platform 16, and the elevating platform 16 is connected with a screw nut component driven by a motor and moves along the vertical direction.
Specifically, referring to fig. 3, the screw nut assembly includes a ball screw 19, a ball nut 15 screwed on the ball screw 19.
The lifting platform 16 is fixedly connected with the ball nut 15, and one end of the ball screw 19 is connected with the stepping motor 13 through the coupler 14.
The screw nut component and the stepping motor 13 are arranged on the supporting plate 12, and the bottom of the supporting plate 12 is fixed on the bottom plate 18. To improve the stability of the support structure, a reinforcing triangle 17 is connected between the base plate 18 and the support plate 12.
Specifically, referring to fig. 4, the cylinder holder 11 includes a square tube base 21 and a cylinder holder 20 mounted on the square tube base 21.
During detection, the detected gas cylinder 3 is stably placed through the gas cylinder support 11.
The structure of the gas cylinder 3 to be tested also comprises a carbon fiber layer 6 arranged on the outer layer of the inner container 7.
The infrared imaging thermal assembly comprises a miniature thermal infrared imager 5 which is arranged inside the gas cylinder 3 to be detected and used for collecting thermal image data of the surface of the inner container 7.
The micro thermal infrared imager 5 is connected with the computer 1, and transmits the acquired data to the computing software for analysis and processing, and finally obtains a detection result.
Referring to fig. 5, the detection method of the ultrasonic infrared thermal imaging detection system for detecting microcracks in the gas cylinder liner in this embodiment includes the following steps:
step one, arranging a laser 9 outside a gas cylinder 3 to be detected through a lifting mechanism 8, and arranging a prism 4, a cylindrical lens 10 and a miniature thermal infrared imager 5 inside the gas cylinder 3 to be detected;
specifically, as shown in fig. 1, the gas cylinder 3 to be measured can be laid flat by the gas cylinder support 11, and the triangular prism 4 and the cylindrical lens 10 can be installed above the bottom wall surface of the inner container 7 by using the support member;
specifically, the miniature thermal infrared imager 4 is connected to the computer 1 by a cable 2;
starting a laser 9, adjusting a light path until a generated laser beam changes the light path through a prism 4, forms a linear light source through a cylindrical lens 10, irradiates on the surface of the inner container 7, and excites the surface acoustic wave on the surface of the inner container 7;
step two, adjusting the laser 9 to move continuously along the height direction through the lifting mechanism 8, and controlling the laser beam to be in the refraction range of the triangular prism 4, so that the linear light source is changed continuously, namely the continuously changed linear light source is formed on the surface of the inner container 7, and the ultrasonic surface wave with enhanced intensity and propagating along the surface is excited on the surface of the inner container 7;
when the ultrasonic surface wave is transmitted in the gas cylinder liner 7, the ultrasonic surface wave and the micro closed crack generate heat through friction under the action of a thermoelastic effect, and the local temperature rise of a crack area is further improved;
and thirdly, acquiring continuously changed thermal image data on the surface of the inner container 7 by using the miniature thermal infrared imager 5, starting detection software of the computer 1 to analyze and process the thermal image data characteristics acquired by the thermal infrared imager 4, and obtaining miniature closed crack information, namely a specific detection result.
As an embodiment, the laser 9 is continuously moved in the height direction at a constant speed. When the ultrasonic wave is in uniform motion, the generated ultrasonic surface wave has better interference superposition effect.
In the testing process, the specific positions of the triangular prism 4 and the cylindrical lens 10 are set on the basis of the principle that more linear light sources can be incident on the surface of the inner container 7, and the specific position of the miniature thermal infrared imager 5 is set on the basis of the principle that the miniature thermal infrared imager can collect thermal image data of the surface of the inner container 7 to the maximum extent.
In the testing process, parameters such as signals and power of the laser 9 and the signals and parameter adjustment of the miniature thermal infrared imager 5 are set according to actual testing requirements. The computer 1 is provided with a computer software which is matched with the commercial software of the miniature thermal infrared imager 5, and can rapidly and accurately process the data collected by the miniature thermal infrared imager 5.
Specifically, the laser 9 may employ a pulse laser.
During testing, the position state of the tested gas bottle 3 is flexibly arranged according to the structural size characteristics of the gas bottle, the flat state shown in fig. 1 is one optional state, and other arrangement modes which are convenient to stably place and flexibly set the triangular prism 4, the cylindrical lens 10 and the micro thermal infrared imager 5 can be selected.
The optional form of the lifting mechanism 8 is various, and other linear driving mechanisms can be selected besides the form of the screw nut assembly listed in the embodiment, so that the requirement that the laser beam position of the laser 9 is continuously adjusted to generate continuously-changed linear light sources is met.
According to the testing method, the continuously-changed linear light source is utilized, the receiving area of the linear light source on the surface of the inner container 7 is enlarged, so that strong surface ultrasonic waves are excited, the thermoelastic effect is enhanced, the temperature rise of surface closed cracks is facilitated, the contrast of thermal imagery imaging is improved, and the accuracy of finally obtained detection results is greatly improved.
Claims (4)
1. An ultrasonic infrared thermal imaging detection system for microcracks of a gas cylinder liner is characterized by comprising a laser excitation assembly and an infrared imaging thermal assembly;
the laser excitation assembly comprises a laser (9), a lifting mechanism (8), a triangular prism (4) and a cylindrical lens (10), the laser (9) is arranged outside the gas cylinder (3) to be detected, and the triangular prism (4) and the cylindrical lens (10) are both arranged inside the gas cylinder (3) to be detected;
the laser beam emitted by the laser (9) changes direction through the triangular prism (4), forms a line light source through the cylindrical lens (10), then irradiates the surface of the inner container (7) of the measured gas cylinder (3), and excites the surface of the inner container (7) to generate ultrasonic surface waves;
the lifting mechanism (8) is used for continuously adjusting the height of the laser (9) to enable the position of the linear light source to be continuously changed, so that the surface of the inner container (7) is excited to generate ultrasonic surface waves with enhanced intensity;
the infrared imaging thermal assembly comprises a miniature thermal infrared imager (5) which is arranged inside the gas cylinder (3) to be detected and used for collecting thermal image data of the surface of the inner container (7).
2. The ultrasonic infrared thermal imaging detection system for microcracks in a gas cylinder liner according to claim 1, wherein the lifting mechanism (8) has a structure that: the lifting platform (16) is connected with a screw nut assembly driven by a motor and moves along the vertical direction.
3. The detection method of the ultrasonic infrared thermal imaging detection system for the microcracks in the gas cylinder liner is characterized by comprising the following steps of:
step one, arranging a laser (9) outside a gas cylinder (3) to be detected, and arranging a prism (4), a cylindrical lens (10) and a miniature thermal infrared imager (5) inside the gas cylinder (3) to be detected;
starting a laser (9), changing the light path of the generated laser beam through a triangular prism (4), forming a linear light source through a cylindrical lens (10), irradiating the linear light source on the surface of the inner container (7), and exciting an ultrasonic surface wave which can propagate along the surface on the surface of the inner container (7);
secondly, the laser (9) continuously moves along the height direction, and the laser beam is controlled within the refraction range of the triangular prism (4), so that the position of the linear light source is continuously changed, and the ultrasonic surface wave with enhanced intensity is excited on the surface of the inner container (7);
and thirdly, acquiring continuously changed thermal image data of the surface of the inner container (7) by using the miniature thermal infrared imager (5), and processing the acquired data by using the computer (1) to obtain crack information of the surface of the inner container (7).
4. A method as claimed in claim 3, characterized in that the laser (9) is moved with a uniform speed in the height direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111008245.5A CN113866219A (en) | 2021-08-30 | 2021-08-30 | Ultrasonic infrared thermal imaging detection method and system for microcracks of gas cylinder liner |
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| CN202111008245.5A CN113866219A (en) | 2021-08-30 | 2021-08-30 | Ultrasonic infrared thermal imaging detection method and system for microcracks of gas cylinder liner |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009073014A1 (en) * | 2007-12-06 | 2009-06-11 | Lockheed Martin Corporation | Non-destructive inspection using laser- ultrasound and infrared thermography |
| US20110249115A1 (en) * | 2010-04-07 | 2011-10-13 | Marc Genest | Apparatus for crack detection during heat and load testing |
| CN108169282A (en) * | 2017-12-30 | 2018-06-15 | 西安交通大学 | Differential type induced with laser THERMAL IMAGING NONDESTRUCTIVE TESTING system and method |
| US20190064119A1 (en) * | 2017-08-28 | 2019-02-28 | Siemens Energy, Inc. | Laser ultrasonic thermography inspection |
| AU2020101234A4 (en) * | 2020-07-02 | 2020-08-06 | Hunan University Of Science And Technology | An Optimization Method for Excitation Parameters of Ultrasonic Infrared Thermography Crack Nondestructive Testing |
-
2021
- 2021-08-30 CN CN202111008245.5A patent/CN113866219A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009073014A1 (en) * | 2007-12-06 | 2009-06-11 | Lockheed Martin Corporation | Non-destructive inspection using laser- ultrasound and infrared thermography |
| US20110249115A1 (en) * | 2010-04-07 | 2011-10-13 | Marc Genest | Apparatus for crack detection during heat and load testing |
| US20190064119A1 (en) * | 2017-08-28 | 2019-02-28 | Siemens Energy, Inc. | Laser ultrasonic thermography inspection |
| CN108169282A (en) * | 2017-12-30 | 2018-06-15 | 西安交通大学 | Differential type induced with laser THERMAL IMAGING NONDESTRUCTIVE TESTING system and method |
| AU2020101234A4 (en) * | 2020-07-02 | 2020-08-06 | Hunan University Of Science And Technology | An Optimization Method for Excitation Parameters of Ultrasonic Infrared Thermography Crack Nondestructive Testing |
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