Alloy surface consistency online detection device

Abstract

The utility model discloses an alloy surface consistency on-line detection device, which relates to the field of alloy surface detection and comprises a control module, a spectrograph, a high repetition frequency laser and an optical system. The high repetition frequency laser and the spectrometer are electrically connected with the control module through signal lines. The optical system is positioned below the high repetition frequency laser; the repetition frequency of the high repetition frequency laser ranges from 1 kHz to 10 kHz. According to the utility model, the high-repetition-frequency laser is used for performing high-repetition-frequency excitation on the line area on the surface of the sample, the spectrograph is used for acquiring spectral data of each area in the line area, and the volatility of the acquired spectral data is analyzed in combination with the original spectral data, so that the consistency of the alloy surface can be detected. In addition, the detection device can improve the detection speed and precision. And meanwhile, by adopting the high repetition frequency laser, the instrument cost can be obviously reduced on the premise of ensuring that the sample is fully ablated.

Description

Technical Field

[0001] The utility model relates to the field of alloy surface detection, in particular to an online detection device for alloy surface consistency. Background Art

[0002] Metal sheets are widely used in industrial production and daily life, involving many application fields, including but not limited to construction, aerospace, machinery, automobiles and ships, and are the basic materials for many products. However, in the actual production process, the differences in production equipment, changes in the production environment and other factors will cause various surface defects on metal sheets, such as dents, cracks, bubbles and scratches.

[0003] The above defects will reduce the quality and reliability of metal sheets, and even cause safety hazards to the use of metal sheets. Therefore, it is very important to detect and identify surface defects of metal sheets in a timely and accurate manner. Traditional surface defect detection methods for metal sheets mainly rely on manual detection or based on some simple image processing algorithms. These methods have defects such as manual errors, limited scope of application, low detection speed and accuracy, etc. Utility Model Content

[0004] The purpose of the utility model is to provide an online detection device for alloy surface consistency, which detects and analyzes the volatility of spectral data by adopting a high repetition rate laser, a spectrometer, an optical system and a control module as core components to achieve efficient detection of alloy surface consistency.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides an online detection device for alloy surface consistency, comprising a control module, a spectrometer, a high repetition rate laser and an optical system;

[0007] The high repetition rate laser and the spectrometer are both electrically connected to the control module via a signal line;

[0008] The optical system is located below the high repetition rate laser;

[0009] The repetition frequency of the high repetition rate laser is 1-10 kHz.

[0010] Optionally, the detection device further comprises a housing;

[0011] The shell is a cubic structure with a hollow interior;

[0012] The control module is fixed to the inside of the shell by screws; the high repetition rate laser is fixed to the right side surface of the outside of the shell by screws; the spectrometer is fixed to the left side surface of the outside of the shell by screws; and the optical system is fixed to the lower surface of the outside of the shell by screws.

[0013] Optionally, the detection device further comprises a displacement stage;

[0014] The translation platform is rigidly connected to the housing via metric screws.

[0015] Optionally, the detection device further comprises a conveyor belt and a support frame;

[0016] The conveyor belt includes a frame, a conveyor belt, rollers, a drum, a tensioning device and a transmission device, which are used to carry and transmit the sample to be tested; the transmission device includes a motor and a speed regulator, which are used to control the running speed of the conveyor belt;

[0017] The support frame is a U-shaped structure, and its two end points are respectively fixed on both sides of the conveyor belt.

[0018] Optionally, the detection device further includes an extended display;

[0019] The extended display is electrically connected to the control module via a signal line, and the extended display is used to display the collected data and analysis results sent by the control module.

[0020] Optionally, the translation stage is fixed at a middle position of the support frame, and the translation stage adjusts the focal plane of the optical system by moving in a Z-axis direction; the Z-axis direction is a direction perpendicular to the conveyor belt.

[0021] Optionally, the optical system is a non-coaxial optical system, comprising a supporting structure, a group of reflectors and three groups of plano-convex lenses; the reflectors and plano-convex lenses are placed in an internal groove of the supporting structure.

[0022] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects: the utility model provides an online detection device for alloy surface consistency, wherein the detection device includes a high repetition rate laser, a spectrometer, an optical system and a control module; the high repetition rate laser and the spectrometer are electrically connected to the control module through a signal line; the optical system is located below the high repetition rate laser; the repetition rate of the high repetition rate laser is 10kHz, and it has a high repetition rate output characteristic. Since the utility model uses a high repetition rate laser to perform high repetition rate excitation on the line area of ​​the sample surface, the spectrometer collects the spectral data of each area in the line area, and analyzes the volatility of the collected spectral data in combination with the original spectral data, the detection of the consistency of the alloy surface can be realized; at the same time, the speed and accuracy of the detection can be greatly improved.

[0023] Moreover, the utility model adopts a high repetition frequency output characteristic and has a high repetition frequency laser, which can significantly reduce the instrument cost under the premise of ensuring sufficient ablation of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A front view of the core components of the on-line detection device for alloy surface consistency provided by an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of an online detection device for alloy surface consistency provided by an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the structure of an online detection device for alloy surface consistency provided by an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the optical path of the optical system provided by the embodiment of the utility model;

[0029] Figure 5 A spectral image collected at a certain moment provided by an embodiment of the utility model;

[0030] Figure 6 This is a spectral image collected multiple times provided in an embodiment of the utility model.

[0031] Explanation of symbols:

[0032] In the figure: 1: control module; 2: spectrometer; 3: high repetition rate laser; 4: optical system; 5: power control system; 6: extended display; 7: housing; 8: translation stage; 9: external power supply; 10: support frame; 11: sample to be tested; 12: conveyor belt; 13: target element extraction module; 14: original spectrum display module; 15: peak fluctuation anomaly detection module; 16: abnormal area calculation module; 17: reflector; 18: first plano-convex lens; 19: second plano-convex lens; 20: third plano-convex lens. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The utility model aims to provide a method for detecting and analyzing the volatility of spectral data by adopting a high repetition rate laser, a spectrometer, an optical system and a control module as core components, so as to realize the detection of the consistency of the alloy surface.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] In one embodiment, Figure 1-3 As shown, the utility model provides an online detection device for alloy surface consistency, including a control module 1, a spectrometer 2, a high repetition rate laser 3 and an optical system 4.

[0037] The high repetition rate laser 3 and the spectrometer 2 are both electrically connected to the control module via signal lines. The optical system is located below the high repetition rate laser.

[0038] The repetition frequency of the high repetition rate laser 3 is 1-10 kHz.

[0039] The optical system 4 is a non-coaxial optical system, including a support structure, a set of reflectors and three sets of plano-convex lenses; the reflectors and plano-convex lenses have a lens diameter of 1 / 2 inch, are placed in the inner groove of the support structure, and are fixed in position by adhesive, and the outer support structure is made of aluminum alloy; and the optical path schematic diagram of the optical system 4 is as shown in Figure 4 The incident laser is reflected by the reflector 17 onto the first plano-convex lens 18, and then the first plano-convex lens 18 focuses the laser onto the sample surface, the laser ablates the sample to generate plasma, the radiation generated by the plasma is collected by the second plano-convex lens 19 and transmitted to the third plano-convex lens 20, and the third plano-convex lens 20 focuses on the optical input port of the spectrometer.

[0040] It should be noted that the control module 1 in this embodiment uses the Raspberry Pi 3rd generation B+ development board; considering the complexity of the interface types required when the embedded platform is integrated with other external devices, Raspberry Pi is selected as the main embedded development platform; this hardware platform has more interfaces, which can meet the communication needs, and also has many advantages such as lower cost, lower loss, better reliability, processing speed, smaller size and weight.

[0041] In this embodiment, the spectrometer 2 is an AvaSpec-Mini series spectrometer, which has a volume of 95x 68x20mm and a weight of 185g, and is a very suitable component for developing handheld devices; the spectrometer provides a spectral resolution of 0.20-0.29nm in the wavelength range of 220-400nm, a spectrometer slit of 25μm, uses the UBS2.0 universal transmission protocol, and the transmission rate of a single acquisition is 3ms / scan.

[0042] In this embodiment, the high repetition rate laser 3 uses a Q-switched Nd:YAG laser with a wavelength of 1064nm as an excitation source. The laser body has a size of 110×29×33mm and a weight of 209g. The repetition frequency of the laser is 10kHz, the pulse energy is about 100μJ, the pulse duration is 10ns, the laser divergence angle is <1.5mard, M2<1.5, and the power supply volume of the laser is 75×80×34mm, and the weight is 270g.

[0043] Furthermore, the detection device also includes a shell 7; the shell 7 is a hollow cube structure and is printed by using a 3D printer.

[0044] The control module 1 is fixed to the inside of the shell 7 by screws; the high repetition rate laser 3 is fixed to the right side surface of the outside of the shell 7 by screws; the spectrometer 2 is fixed to the left side surface of the outside of the shell 7 by screws; the optical system 4 is fixed to the lower surface of the outside of the shell 7 by screws; and a power control system 5 is built into the lower surface inside the shell 7, which first receives the 220V AC power input by the external power supply 9, converts the 220V AC power into the voltage value required by each component, and supplies power to each component.

[0045] Furthermore, the detection device further comprises a displacement platform 8; the displacement platform 8 is rigidly connected to the housing 7 via metric screws.

[0046] It should be noted that in this embodiment, the translation stage 8 uses the PA series electric linear slide produced by Zhuoli Hanguan; this product is a medium to large size, medium to large stroke precision linear slide designed by Zhuoli Hanguan, and its base plate is processed with a U-shaped structure, which is suitable for high load, high rigidity or assembly use; moreover, a dust cover can be optionally equipped to effectively prevent particles and dust from entering the interior of the slide, ensuring the stability and reliability of the translation stage during movement, and improving the durability and precision retention of this series of products.

[0047] Furthermore, the detection device also includes a conveyor belt 12 and a support frame 10; the conveyor belt 12 includes a frame, a conveyor belt, rollers, a roller, a tensioning device and a transmission device, which is used to carry and transmit the sample 11 to be tested; the transmission device includes a motor and a speed regulator, which is used to control the running speed of the conveyor belt; the support frame 10 is a U-shaped structure, and its two end points are respectively fixed on both sides of the conveyor belt 12.

[0048] Furthermore, the detection device also includes an extended display 6 ; the extended display 6 is electrically connected to the control module 1 via a signal line, and the extended display 6 is used to display the collected data and analysis results sent by the control module 1 .

[0049] Furthermore, the translation stage 8 is fixed at a middle position of the support frame 10 , and the translation stage 8 adjusts the focal plane of the optical system 4 by moving in the Z-axis direction; the Z-axis direction is a direction perpendicular to the conveyor belt 12 .

[0050] Working principle: When the conveyor belt 12 carries the sample 11 to be tested and moves at a specified speed, the core detection module starts working and waits for the sample to pass; when the sample passes under the high repetition rate laser 3, the control module 1 will control the high repetition rate laser 3 to ablate the surface of the sample 11 to be tested at a high repetition rate. Due to the high repetition rate characteristics of the high repetition rate laser 3, a large amount of plasma will be rapidly generated on the surface of the sample 11 to be tested, and an ablation groove will be left on its surface; at the same time, the spectrometer 2 is started to collect the plasma generated on the surface of the sample 11 to be tested. Since the excited plasma will continue to exist at the focusing position of the optical system 4, the spectrometer 2 is set to the continuous integration mode, so that the spectral images of each area in the ablation groove can be collected, and the spectrometer 2 sends the collected spectral data to the control module 1.

[0051] The control module 1 first uses the target element extraction module 13 to identify and extract the element spectrum peaks in the spectral data, and sends the identification results to the original spectrum display module 14 for the observer to identify; after the spectrum peaks of the original spectrum are identified, the peak fluctuation anomaly detection module 15 will analyze and distinguish the spectrum peaks of all spectra, and evaluate the size of the fluctuation by calculating the relative standard deviation (RSD) of the element spectrum peaks collected multiple times. When the RSD of the collected spectrum data is greater than 20%, it is judged that the fluctuation amplitude is large and the surface consistency is poor; when the RSD of the collected spectrum data is less than 20%, it is judged that the fluctuation amplitude is small and the surface consistency is good; thereby finding the fluctuation abnormal area; finally, the abnormal area calculation module 16 will calculate the position of the abnormal area on the surface of the sample to be tested 11 according to the integration time of the spectrometer 2, the position of the number of collections with the largest spectrum fluctuation, and the running speed of the conveyor belt 12.

[0052] For example, aluminum alloy 2A12 is used as the sample to be tested. After the target element extraction, the spectral peaks of elements such as Fe, Mn, Mg, and Al can be extracted. The spectral data collected at a certain time is as follows: Figure 5 shown.

[0053] By using a spectrometer to collect spectral image data multiple times, such as Figure 6 As shown in the figure, since the elements contained in the metal samples are relatively similar, the spectral peak wavelength in each spectrum image collected is the same (same horizontal axis), and taking the Mg element spectrum peak at 279.5nm as an example, the peak value of the spectrum data collected by the spectrometer at 279.5nm is extracted each time, and the relative standard deviation (RSD) of the Mg element spectrum peak at 279.5nm collected multiple times is calculated to evaluate the size of the fluctuation. The formula is:

[0054]

[0055] Where x is the average value of the spectral peak intensity, n is the number of times the spectrum is collected, and x i is the peak intensity of the spectrum obtained for the i-th collection; when the RSD of the collected spectral data is greater than 20%, it is judged that the fluctuation range is large and the surface consistency is poor; when the RSD of the collected spectral data is less than or equal to 20%, it is judged that the fluctuation range is small and the surface consistency is good.

[0056] At the same time, we set the integration time of the spectrometer to Ams and the conveyor belt speed to Bmm / s. By querying the collection result diagram, we know that the collection time with the largest spectral fluctuation is the Cth time. Therefore, we can use the formula: abnormal position = C×A×B to get the position where the consistency of the sample surface is poor.

[0057] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. An online detection device for alloy surface consistency, characterized in that: include: Control module, spectrometer, high repetition rate laser and optical system; The high repetition rate laser and the spectrometer are both electrically connected to the control module via a signal line; The optical system is located below the high repetition rate laser; The repetition frequency of the high repetition rate laser is 1-10 kHz.

2. The on-line detection device for alloy surface consistency according to claim 1, characterized in that: The detection device further comprises: a housing; The shell is a cubic structure with a hollow interior; The control module is fixed to the inside of the shell by screws; the high repetition rate laser is fixed to the right side surface of the outside of the shell by screws; the spectrometer is fixed to the left side surface of the outside of the shell by screws; and the optical system is fixed to the lower surface of the outside of the shell by screws.

3. The on-line detection device for alloy surface consistency according to claim 2, characterized in that: The detection device also includes: a displacement stage; The translation platform is rigidly connected to the housing via metric screws.

4. The on-line detection device for alloy surface consistency according to claim 3, characterized in that: The detection device also includes: a conveyor belt and a support frame; The conveyor belt includes a frame, a conveyor belt, rollers, a drum, a tensioning device and a transmission device, which are used to carry and transmit the sample to be tested; the transmission device includes a motor and a speed regulator, which are used to control the running speed of the conveyor belt; The support frame is a U-shaped structure, and its two end points are respectively fixed on both sides of the conveyor belt.

5. The on-line detection device for alloy surface consistency according to claim 1, characterized in that: The detection device further comprises: an extended display; The extended display is electrically connected to the control module via a signal line, and the extended display is used to display the collected data and analysis results sent by the control module.

6. The on-line detection device for alloy surface consistency according to claim 4, characterized in that: The translation stage is fixed at the middle position of the support frame, and the translation stage adjusts the focal plane of the optical system by moving in the Z-axis direction; the Z-axis direction is a direction perpendicular to the conveyor belt.

7. The on-line detection device for alloy surface consistency according to claim 1, characterized in that: The optical system is a non-coaxial optical system, comprising a supporting structure, a group of reflecting mirrors and three groups of plano-convex lenses; the reflecting mirrors and plano-convex lenses are placed in the inner groove of the supporting structure.

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