Excitation device and detection system suitable for active infrared nondestructive testing

Abstract

The invention relates to an excitation device and a detection system suitable for active infrared nondestructive testing, the excitation device comprises a lamp tube, a reflecting cover and double-layer optical glass, the lamp tube adopts an annular or latticed halogen filament, the appearance of the lamp tube adopts a straight cylinder shape, and the material of the lamp tube is frosted quartz glass; one surface of the reflecting cover is concave to form a cavity, so that the lamp tube is arranged in the cavity of the reflecting cover; the double-layer optical glass is stacked at a preset interval, serves as a base and is fixed to the reflecting cover, and the double-layer optical glass is made of quartz materials. The influence of uneven irradiation of an excitation source lamp tube is reduced, the influence of infrared energy radiated by the excitation device on a detected object is reduced, the noise of an infrared image is reduced, the definition of the infrared image is improved, and the defect recognition capability of infrared nondestructive testing equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal excitation detection, and in particular to an excitation device and a detection system suitable for active infrared nondestructive detection. Background Art

[0002] The core of pulse thermal excitation infrared imaging technology is to use an excitation source to quickly and evenly heat the object under test, thereby stimulating thermal anomalies at the defects, and using an infrared thermal imager to capture the temperature difference on the surface of the object for defect detection.

[0003] Directly using ordinary flash lamps or halogen lamps as excitation sources will cause uneven heating due to the uneven irradiation of the lamp source itself, resulting in large differences in the energy of infrared waves radiated at different positions on the surface of the object, causing large fluctuations in the temperature field of the thermal radiation image collected by the infrared thermal imaging equipment, affecting the discovery, identification and judgment of internal defects of the object. Therefore, the design of the excitation device is crucial to the imaging quality and detection effect. The factors affecting the uniformity of the irradiation energy of the excitation source are mainly the shape of the filament, the material of the lamp tube, the shape and material of the lampshade, etc. The pulse thermal excitation infrared imaging technology mainly collects infrared images of the cooling stage after the object under test absorbs thermal excitation, and it is necessary to reduce the influence of the infrared energy radiated by the excitation device itself on the object under test. Summary of the invention

[0004] The main purpose of the present invention is to provide an excitation device and a detection system suitable for active infrared non-destructive testing, which are used to reduce the influence of uneven irradiation of the excitation source lamp tube, reduce the influence of the infrared energy radiated by the excitation device itself on the object to be tested, help reduce infrared image noise, improve the clarity of infrared images, and enhance the defect recognition ability of infrared non-destructive testing equipment.

[0005] To achieve the above object, the present invention provides an excitation device suitable for active infrared nondestructive testing, the excitation device comprising:

[0006] A lamp tube, wherein the lamp tube adopts a ring-shaped or grid-shaped halogen filament, the shape of the lamp tube adopts a straight-cylindrical shape and the material is frosted quartz glass;

[0007] A reflector, one side of which is concave to form a cavity, so that the lamp tube can be placed in the cavity of the reflector;

[0008] Double-layer optical glass has a preset interval stacking arrangement and is fixed to the reflector as a base and is made of quartz material.

[0009] Furthermore, a lamp tube stabilizing assembly is disposed on the lamp tube side, and the lamp tube stabilizing assembly includes:

[0010] A first side block, a second side block and a support, wherein two ends of the support are respectively fixedly connected to the top positions of the first side block and the second side block, and the bottom positions of the first side block and the second side block are both provided with grooves, and the two ends of the lamp tube are embedded in the first side block and the second side block through the grooves;

[0011] Openings are respectively provided on both sides of the reflector, and the openings are respectively adapted and fixedly installed with the first side block and the second side block;

[0012] A plurality of fixing holes are arranged on the concave surface of the reflector, and screws are passed through the support and the fixing holes to fix the support and the reflector;

[0013] Through the connection mode of the first side block, the second side block and the reflector, the five directions of the lighting direction of the lamp tube, namely, upward, front, rear, left and right, are locked, and the lamp tube is stabilized in the chamber of the reflector.

[0014] Furthermore, the spring sheets arranged at both ends of the support are fixedly connected corresponding to the first side block and the second side block one by one, and contact the lamp tube to supply power.

[0015] Furthermore, the excitation device comprises a shell, which is an open structure having a cavity so that the lamp tube and the reflector can be arranged in the cavity of the shell, and the shell is made of a heat-insulating material and is black in color.

[0016] Furthermore, a mounting hole is provided on the top surface of the shell.

[0017] Furthermore, the excitation device comprises a plurality of fixed blocks, one end of each of the fixed blocks is fixedly connected to a reflector, and the other end of each of the fixed blocks is provided with a heat-insulating film connected to the double-layer optical glass.

[0018] Further, the double-layer optical glass includes a first optical glass and a second optical glass;

[0019] The first optical glass and the second optical glass are fixedly connected in upper and lower layers by a plurality of screws, and the interval between the first optical glass and the second optical glass can be adjusted by the screws;

[0020] The screws are heat-insulating screws.

[0021] Furthermore, the size of the second optical glass is greater than the cross-sectional size of the first optical glass.

[0022] Furthermore, a plurality of heat-insulating pads are arranged between the first optical glass and the second optical glass.

[0023] The present invention further proposes a detection system, comprising: the above-mentioned excitation device, infrared thermal imager, equipment control module, data communication and signal processing module, and data processing computer, wherein several excitation devices and infrared thermal imagers are respectively connected to the equipment control module, data communication and signal processing module to send data to the data processing computer for data processing.

[0024] The excitation device suitable for active infrared nondestructive testing provided by the present invention has the following beneficial effects:

[0025] (1) Halogen lamps use ring-shaped or grid-shaped filaments to reduce the impact of the filament shape on irradiation uniformity. The lamp material is frosted quartz glass, and the overall shape of the lamp is linear, providing uniform and stable irradiation energy.

[0026] (2) The reflector is made of aluminum alloy with a silver mirror-plated surface and a parabolic cross-section to improve light reflectivity and energy efficiency.

[0027] (3) The optical glass is made of transparent quartz glass with high temperature resistance, good stability and excellent light transmittance. The visible light transmittance is more than 93% and the infrared light transmittance is 85%. It reduces the energy loss of visible light, short-wave and medium-wave infrared and blocks the transmission of long-wave infrared. The size of the second optical glass is larger than the cross-sectional size of the first optical glass and the base, which can effectively reduce the influence of the infrared radiation of the excitation device itself on the data collected by the infrared detector during the cooling stage.

[0028] (4) Effectively reduce the impact of uneven irradiation of the excitation source lamp itself, generate a uniform and stable excitation light field, and improve the utilization efficiency of radiation energy; greatly reduce the impact of the infrared energy radiated by the excitation device itself on the object being measured, reduce the impact on the infrared detector during the cooling stage, and improve the accuracy of collected data; help reduce infrared image noise, improve the clarity of infrared images, and enhance the defect recognition ability of infrared non-destructive testing equipment; strong applicability, can be used alone, two or four symmetrical excitation modules are used, and are flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an excitation device suitable for active infrared non-destructive testing in one embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the structural decomposition of an excitation device suitable for active infrared non-destructive testing in one embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structural decomposition of an excitation device suitable for active infrared non-destructive testing in an embodiment of the present invention;

[0032] Figure 41 is a system structure diagram of a detection system in one embodiment of the present invention.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] Reference Figure 1-3 , which is a schematic diagram of the structure of an excitation device suitable for active infrared non-destructive testing proposed by the present invention:

[0036] In the schematic diagram, the excitation device includes:

[0037] A lamp tube 21, wherein the lamp tube 21 adopts a ring-shaped or grid-shaped halogen filament, the shape of the lamp tube 21 adopts a straight-cylindrical shape and the material is frosted quartz glass;

[0038] The double-layer optical glass 4 has a preset interval and is stacked, and is fixed to the reflector 3 as a base, and is made of quartz material.

[0039] Specifically, the halogen lamp tube 21 uses a ring-shaped or grid-shaped filament to reduce the influence of the filament shape on the irradiation uniformity. The material of the lamp tube 21 is frosted quartz glass. The overall shape of the lamp tube 21 is linear, providing uniform and stable irradiation energy.

[0040] The reflector 3 is made of aluminum alloy, the surface is treated with silver mirror, and the cross-section shape is a parabola, which improves the light reflectivity and energy utilization efficiency.

[0041] The optical glass is made of transparent quartz glass with high temperature resistance, good stability and excellent light transmittance. The visible light transmittance is more than 93% and the infrared light transmittance is 85%, which reduces the energy loss of visible light, short-wave and medium-wave infrared, and blocks the transmission of long-wave infrared. The size of the second optical glass 42 is larger than the first optical glass 41 and the cross-sectional size of the base, which can effectively reduce the influence of the infrared radiation of the excitation device itself on the data collected by the infrared detector during the cooling stage.

[0042] In one embodiment, a lamp tube stabilizing assembly 2 is disposed on the side of the lamp tube 21, and the lamp tube stabilizing assembly 2 includes:

[0043] A first side block 22, a second side block 23 and a support 24, wherein two ends of the support 24 are respectively fixedly connected to the top positions of the first side block 22 and the second side block 23, and the bottom positions of the first side block 22 and the second side block 23 are both provided with grooves, through which the two ends of the lamp tube 21 are embedded in the first side block 22 and the second side block 23;

[0044] The two sides of the reflector 3 are respectively provided with openings 31, and the openings 31 are respectively adapted and fixedly installed with the first side block 22 and the second side block 23;

[0045] A plurality of fixing holes are provided on the concave surface of the reflector 3, and screws 43 are passed through the support 24 and the fixing holes to fix the support 24 to the reflector 3;

[0046] Through the connection between the first side block 22 , the second side block 23 and the reflector 3 , the five directions of the lighting direction of the lamp tube 21 , namely, upward, front, rear, left and right, are locked, and the lamp tube 21 is stabilized in the chamber of the reflector 3 .

[0047] Specifically, the lamp tube 21 is fixed by the first side block 22, the second side block 23 and the support 24, and five of the six light-scattering surfaces of the lamp tube 21 are closed by direct mutual shielding of the structure, leaving only one illuminated surface at the bottom, which needs to pass through the double-layer optical glass 4 to illuminate the product to be tested.

[0048] In addition, the two ends of the halogen lamp tube 21 and the lamp tube 21 support 24 are installed in a plug-in manner, and the lamp tube 21 is fixed and powered by spring sheets 241 at both ends of the support 24, which is also convenient for subsequent maintenance and replacement. The installation height of the light is calculated based on the cross-sectional shape of the reflector 3, and it is necessary to ensure that the halogen lamp tube 21 is located at the parabola focus of the cross-sectional shape of the reflector 3 after installation.

[0049] In one embodiment, the spring pieces 241 disposed at both ends of the support 24 are fixedly connected correspondingly to the first side block 22 and the second side block 23 , and contact the lamp tube 21 for power supply.

[0050] In one embodiment, the excitation device includes a shell 1, which is an open structure with a cavity so that the lamp tube 21 and the reflector 3 can be arranged in the cavity of the shell 1, and the shell 1 is made of heat-insulating material and is black in color.

[0051] Specifically, the housing 1 is an open structure, made of aluminum alloy, with an opening 31 at the bottom, a support 24 power line threading hole, two lamp 21 support 24 mounting holes 11, and four mounting and fixing holes for connecting with other devices are reserved at the top. The lamp 21 support 24 is located between the housing 1 and the reflector 3. By setting limiting holes at the middle positions of both ends of the reflector 3, the positions of the support 24 and the lamp 21 are fixed and limited. The housing 1, the lamp 21 support 24, and the reflector 3 are fixed by bolts;

[0052] The top surface of the housing 1 is provided with a mounting hole 11 for subsequently mounting a robotic arm through the mounting hole 11 so that the excitation device is aligned with the product to be tested.

[0053] In one embodiment, the excitation device includes a plurality of fixed blocks 5 , one end of each of the fixed blocks 5 is fixedly connected to the reflector 3 , and the other end of each of the fixed blocks 5 is provided with a heat insulation film 6 connected to the double-layer optical glass 4 .

[0054] Specifically, the fixing block 5 is made of aluminum alloy, and its surface is oxidized.

[0055] In one embodiment, the double-layer optical glass 4 includes a first optical glass 41 and a second optical glass 42;

[0056] The first optical glass 41 and the second optical glass 42 are fixedly connected in upper and lower layers by a plurality of screws 43, and the interval between the first optical glass 41 and the second optical glass 42 can be adjusted by the screws 43;

[0057] The screws 43 are heat-insulating screws.

[0058] Specifically, the first optical glass 41 and the second optical glass 42 have holes at the four corners, the heat-insulating film 6 is located between the first optical glass 41 and the fixing block 5, the heat-insulating pad is located between the inner layer and the second optical glass 42, the inner layer, the second optical glass 42, the heat-insulating film 6, and the heat-insulating pad are screwed and fixed by heat-insulating screws 43, and when designing and manufacturing the contact surface between the fixing block 5 and the heat-insulating film 6, a space for installing the heat-insulating film 6 is reserved and concave treatment is made, and a certain gap between the mounting holes 11 at the four corners of the glass and the heat-insulating screws 43 is reserved to ensure that after the heat-insulating screws 43 are installed, there is a certain gap between the glass and the screws 43, to ensure that the glass can expand and contract normally when the excitation device is working, and to avoid glass shattering due to over-tightening of the screws 43 and excessive tightening torque;

[0059] The size of the second optical glass 42 is larger than the cross-sectional size of the first optical glass 41, and a plurality of thermal insulation pads are arranged between the first optical glass 41 and the second optical glass 42. The thermal insulation pads and thermal insulation screws 43 are made of wear-resistant, hard, flame-retardant, and low-thermal-conductivity polypropylene material, and the thermal conductivity is not greater than 0.017W / (m·k). The thermal insulation blocks and thermal insulation screws 43 can reduce the heat transfer between the fixing block 5, the first optical glass 41 and the second optical glass 42.

[0060] refer to Figure 4 This is a system schematic diagram of a detection system proposed by the present invention, wherein the system includes: the above-mentioned excitation device, infrared thermal imager, equipment control module, data communication and signal processing module, and data processing computer, wherein several excitation devices and infrared thermal imager are respectively connected to the equipment control module, data communication and signal processing module to send data to the data processing computer for data processing.

[0061] Specifically, the excitation device designed in the present invention can be used as an excitation source for active infrared non-destructive testing equipment, which is generally composed of an excitation source, an infrared thermal imager, a communication and signal processing module, an equipment control module, and a data processing computer. When performing non-destructive testing operations, the data processing computer controls the communication and signal processing module to generate the required thermal excitation signal, and the equipment control module controls the excitation source to heat the object being tested. The object being tested absorbs heat and propagates it internally, eventually causing a difference in the surface temperature field of the object being tested. The surface temperature field data of the object being tested is collected by the infrared thermal imager and transmitted to the data processing computer for subsequent image processing calculations.

[0062] To sum up, the excitation device designed in the present invention is mainly used as the excitation source of a device using pulse thermal excitation infrared imaging technology. It can be used alone, or two or four excitation devices can be symmetrically combined into an excitation module for use; the excitation device designed in the present invention can cooperate with a signal generating and controlling device to achieve adjustment of parameters such as the duration, power, cycle length, start and end time of the pulse thermal excitation; the excitation device designed in the present invention can be combined with corresponding supporting tooling to adapt to a variety of infrared non-destructive testing systems that use pulse thermal excitation technology, and has good applicability and expansibility.

[0063] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0064] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An excitation device suitable for active infrared nondestructive testing, characterized in that: The excitation device comprises: A lamp tube, wherein the lamp tube adopts a ring-shaped or grid-shaped halogen filament, the shape of the lamp tube adopts a straight-cylindrical shape and the material is frosted quartz glass; A reflector, one side of which is concave to form a cavity, so that the lamp tube can be placed in the cavity of the reflector; Double-layer optical glass has a preset interval stacking arrangement and is fixed to the reflector as a base and is made of quartz material.

2. The excitation device suitable for active infrared non-destructive testing according to claim 1 is characterized in that: A lamp tube stabilizing assembly is disposed on the lamp tube side, and the lamp tube stabilizing assembly includes: A first side block, a second side block and a support, wherein two ends of the support are respectively fixedly connected to the top positions of the first side block and the second side block, and the bottom positions of the first side block and the second side block are both provided with grooves, through which the two ends of the lamp tube are embedded in the first side block and the second side block; Openings are respectively provided on both sides of the reflector, and the openings are respectively adapted and fixedly installed with the first side block and the second side block; A plurality of fixing holes are arranged on the concave surface of the reflector, and screws are passed through the support and the fixing holes to fix the support and the reflector; Through the connection mode of the first side block, the second side block and the reflector, the five directions of the lighting direction of the lamp tube, namely, upward, front, rear, left and right, are locked, and the lamp tube is stabilized in the chamber of the reflector.

3. The excitation device suitable for active infrared non-destructive testing according to claim 2, characterized in that: The spring sheets arranged at both ends of the support are fixedly connected corresponding to the first side block and the second side block one by one, and contact the lamp tube for power supply.

4. The excitation device suitable for active infrared non-destructive testing according to claim 1, characterized in that: The excitation device comprises a shell, which is an open structure with a cavity so that the lamp tube and the reflector can be arranged in the cavity of the shell, and the shell is made of heat-insulating material and is black in color.

5. The excitation device suitable for active infrared non-destructive testing according to claim 4, characterized in that: A mounting hole is provided on the top surface of the shell.

6. The excitation device suitable for active infrared non-destructive testing according to claim 1, characterized in that: The excitation device comprises a plurality of fixed blocks, one end of each of the fixed blocks is fixedly connected to the reflector, and the other end of each of the fixed blocks is provided with a heat-insulating film connected to the double-layer optical glass.

7. The excitation device suitable for active infrared non-destructive testing according to claim 1 is characterized in that: The double-layer optical glass comprises a first optical glass and a second optical glass; The first optical glass and the second optical glass are fixedly connected in upper and lower layers by a plurality of screws, and the interval between the first optical glass and the second optical glass can be adjusted by the screws; The screws are heat-insulating screws.

8. The excitation device suitable for active infrared non-destructive testing according to claim 7, characterized in that: The size of the second optical glass is greater than the cross-sectional size of the first optical glass.

9. The excitation device suitable for active infrared non-destructive testing according to claim 7, characterized in that: A plurality of heat-insulating pads are arranged between the first optical glass and the second optical glass.

10. A detection system, characterized in that: include: The excitation device, infrared thermal imager, equipment control module, data communication and signal processing module, and data processing computer as described in any one of claims 1 to 9, wherein several excitation devices and infrared thermal imagers are respectively connected to the equipment control module, the data communication and signal processing module, so as to send data to the data processing computer for data processing.

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