CN115839944A - High-frequency laser paint removal effect detection system and method - Google Patents
High-frequency laser paint removal effect detection system and method Download PDFInfo
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Abstract
The invention discloses a system and a method for detecting a high-frequency laser paint removing effect, and belongs to the field of laser cleaning detection. The device is characterized in that laser beams emitted by a high-frequency L1 laser are reflected by a reflector and then sequentially pass through a galvanometer and a focusing field lens to act on the surface of a paint layer. The spectrum collection system inhibits continuous spectrum intensity generated by continuous paint removal through the Glan prism, plasma emission light is focused through the collection lens, the plasma emission light is weakened through the optical filter and is conducted to the spectrometer through the optical fiber, and the spectrometer performs light splitting treatment on the plasma emission light to generate a stable and effective plasma spectrum. Be equipped with time sequence control, data analysis and closed-loop control module in the industrial computer, the industrial computer sets up high frequency laser paint removal process parameter and arouses the environment according to the real-time spectrum characteristic signal of spectrum collection system feedback, guarantees to stabilize the efficient and carries out plasma excitation and collection to the paint removal sample for single beam high frequency laser paint removal effect is better, thereby improves the precision that laser paint removal detected.
Description
Technical Field
The invention relates to the field of laser cleaning detection, in particular to a system and a method for detecting a high-frequency laser paint removing effect.
Background
When the surface coating of the airplane skin drops, ages or is overhauled, the original paint layer on the surface of the airplane needs to be removed. The traditional cleaning method comprises chemical cleaning, mechanical polishing, sand blasting cleaning and the like, but the chemical cleaning seriously pollutes the environment, the mechanical polishing seriously damages the secondary, and the sand blasting cleaning has noise pollution. The prior art is difficult to meet the requirements of green paint removal, environmental protection, high efficiency and the like of aircraft skins. In this background, laser paint removal has been a research hotspot in the aviation manufacturing and maintenance industry. However, the skin multifunctional paint layer is cleaned by laser, so that the action mechanism is complex, the cleaning effect is unknown, and the cleaning effect needs to be detected. The current detection methods mainly comprise acoustic monitoring, image recognition, LIBS detection method and the like. The LIBS detection technology has the characteristics of small damage, rapidness, in-situ performance and no need of sample pretreatment, and has more advantages in the field of laser paint removal detection.
The existing LIBS paint removal detection system is mostly based on a double-laser-beam working mode, a high-frequency (L1) laser beam is used as cleaning laser, and another low-frequency (L2) laser beam is used for exciting plasma of a sample. The double laser beams increase the risk of matrix damage, and the detection precision is reduced by factors such as matrix effect, self-absorption effect, trace element characteristic spectrum overlapping and the like while the system cost is increased. If only the L1 laser working mode is adopted, the paint removing effect and the effective excitation of the plasma are considered at the same time. Because the L1 laser has the characteristics of high repetition frequency and long pulse width (nanosecond level), the peak power of the laser is relatively low, and the laser is not enough to generate plasma; and high repetition frequency and long pulse width laser are needed to ensure the laser paint removing effect, namely the paint removing effect and the effective excitation of plasma are not easy to be considered simultaneously. Meanwhile, compared with the working mode that the traditional LIBS system adopts the L2 laser for plasma excitation, the low peak power density of the L1 laser leads the paint removing process to be prone to heat radiation. The thermal radiation causes the plasma spectral signal to be occupied by continuous bremsstrahlung and composite emission spectra, and obvious linear spectral lines are difficult to form. In addition, the characteristic spectrum of atoms and ions is submerged by strong continuous background radiation caused by the laser paint removal process, so that the collection of the plasma spectrum excited by the L1 laser is difficult, and the application and development of high-frequency laser in the LIBS paint removal detection field are hindered. Therefore, how to stably carry out plasma excitation to the paint removal sample and how to efficiently realize plasma spectrum collection, the single-beam high-frequency laser paint removal effect is better, the laser paint removal detection precision is ensured, and the method is a key problem to be solved urgently in the field of high-frequency laser paint removal detection.
Disclosure of Invention
Aiming at the problems in the field, the invention provides a system and a method for detecting a paint removing effect by high-frequency laser, which solve the technical problems of how to stably carry out plasma excitation on a paint removing sample and how to efficiently realize plasma spectrum collection so as to ensure that the paint removing effect of single-beam high-frequency laser is better.
In order to solve the technical problem, the invention discloses a high-frequency laser paint removal effect detection system which comprises a system control board card, a high-frequency laser controller, a laser cleaning system, a spectrum acquisition system, a sample stage and an industrial personal computer;
the laser cleaning system comprises an L1 laser, a reflector, a galvanometer and a focusing field lens which are arranged in sequence; the high-frequency laser controller is electrically connected with the L1 laser and is used for driving the L1 laser to emit high-frequency laser; after being reflected by a reflector, the high-frequency laser emitted by the L1 laser sequentially passes through a galvanometer and a focusing field lens, and is focused on the surface of a sample paint layer on the sample table; the galvanometer is electrically connected with the system control board card;
the spectrum collection system comprises a Glan prism, a collection lens, an optical filter, an optical fiber and a spectrometer which are sequentially arranged, and plasma emission light generated on the surface of the sample paint layer sequentially passes through the Glan prism, the collection lens, the optical filter, the optical fiber and the spectrometer; the spectrometer is used for carrying out light splitting treatment on the plasma emission light to generate a plasma spectrum;
the industrial personal computer is electrically connected with the system control board card, the high-frequency laser controller and the spectrometer; the industrial personal computer is used for setting the action time sequence of the spectrometer and the L1 laser, and the real-time element spectral characteristic signals of the paint layer transmitted by the spectrometer are collected, so that the paint layer is identified, technological parameters are synchronously regulated and controlled, and the paint removal effect is detected.
Preferably, the device further comprises a three-shaft screw sliding table; the focusing field lens is erected on the table top of the three-shaft screw rod sliding table and used for adjusting the distance between the focusing field lens and the surface of the paint layer; and a three-dimensional rotary table is erected at one end of the three-axis lead screw sliding table, and the Glan prism is erected on the three-dimensional rotary table.
Preferably, the end face of the optical fiber is a cross section of the optical fiber at one side of the optical fiber close to the optical filter, the plasma emitted light passing through the glan prism vertically enters the collecting lens, and the collecting lens, the optical filter and the end face of the optical fiber are parallel and coaxial.
Preferably, the industrial personal computer comprises a time sequence control module, a data analysis module and a closed-loop control module; the time sequence control module sets the action time sequence of the high-frequency laser controller and the spectrometer, the collection action of the spectrometer is delayed relative to the light emitting action of the laser, and the spectrum is collected intermittently at multiple points in the paint removing process; the data analysis module identifies the primer and the finish of the paint layer through spectral information acquired by the spectrometer, and detects the paint removal effect according to real-time element spectral characteristic information of the paint layer; and the closed-loop control module distinguishes the spectrum quality degree of the plasma associated with the paint removing process according to the spectrum data fed back by the data analysis module, synchronously and orthogonally optimizes process parameters, and generates plasma emission light.
Preferably, still include the adsorption unit, the output of adsorption unit is connected with rubber hose, L1 laser light-emitting action triggers the adsorption unit work, will remove the impurity and the waste gas suction rubber hose that the lacquer process produced.
Preferably, the detection method of the high-frequency laser paint removal effect detection system is further included, and the detection method is characterized by comprising the following specific steps:
s1: the industrial personal computer outputs an action instruction to the system control clamping plate to drive the L1 laser to emit light, and adjusts the distance between the focusing field lens and the surface of the paint layer through the portable support according to the paint removal requirements of different paint layer systems, so that the paint removal effects of different focusing positions are obtained, and the optimal focusing field lens position is determined;
s2: after the position of the focusing field lens is determined, the industrial personal computer sets the time delay of the acquisition action of the spectrograph relative to the light emitting action of the laser, and the spectrum is intermittently acquired at multiple points in the paint removing process, the quality degree of the plasma spectrum associated with the paint removing process is judged according to the spectrum data fed back by the industrial personal computer, the process parameters are synchronously and orthogonally optimized, and plasma emission light is generated;
s3: the spectrometer performs light splitting treatment on plasma emission light generated by laser paint removal to generate a plasma spectrum and generate a spectral characteristic signal;
s4: the action time sequence of the spectrograph and the L1 laser is set through the industrial personal computer, real-time element spectral characteristic signals of a paint layer transmitted by the spectrograph are collected, and the types and the content of elements are analyzed according to the wavelength position and the intensity area of a paint layer element spectral line so as to detect the paint removal effect.
Preferably, the optimal range of the process parameters is as follows: the laser power variation range is 30-38W, the frequency variation range is 68-92kHz, the pulse width variation range is 265-350 ns, the scanning speed variation range is 1800-2000 mm/s, namely the peak power density regulation range is 4.74 multiplied by 10 7 -1.07×10 8 W/cm 2 。
Preferably, the data analysis module establishes the relationship among the spectral data, the paint removal effect and the process parameters by using a machine learning algorithm, and transmits the information to the closed-loop control module to form closed-loop control so as to complete the excitation and collection of the plasma spectrum in the high-frequency laser paint removal process.
Preferably, the kind of paint removal comprises: and removing the airplane skin polyurethane finish paint and the epoxy primer paint layer system, and removing the airplane skin polyurethane finish paint or removing the airplane skin epoxy primer paint.
Preferably, the paint system parameters are: the thickness of a white polyurethane finish/yellow epoxy primer paint system is 90-110 mu m; the thickness of the white polyurethane finish paint is 55 to 65 mu m; the thickness of the yellow epoxy primer is 35 to 45 mu m; the aluminum alloy aircraft skin base body is 2024 aluminum alloy.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the high-frequency laser paint removal process parameters and the excitation environment are arranged in the industrial personal computer, so that the laser paint removal effect and the plasma excited peak power density are balanced, the problem that the heat radiation mechanism and the plasma breakdown mechanism are mutually involved in the paint removal process is solved, the industrial personal computer regulates and controls the action time sequence and the paint removal process parameters of the high-frequency laser controller and the spectrometer according to the real-time spectral characteristic signal fed back by the spectrum acquisition system, and the stable and efficient plasma excitation and acquisition of a paint removal sample are ensured, so that the single-beam high-frequency laser paint removal effect is better, and the precision of laser paint removal detection is improved.
(2) According to the invention, through the arrangement of the laser cleaning system and the spectrum acquisition system, the L1 laser can stably emit high-frequency laser, the spectrometer can efficiently acquire plasma emission light meeting the paint removal requirement, the action time sequence of the spectrometer and the L1 laser is optimized through the industrial personal computer, plasma interval acquisition is matched with continuous excitation of laser paint removal plasma, plasma spectrum acquisition in the high-frequency laser paint removal process is realized, the matching problem between the existing spectrum acquisition platform and the high-frequency laser excitation plasma spectrum is solved through optimizing the acquisition path of the spectrum acquisition system, the matching degree of spectrum excitation and acquisition of the LIBS detection system is improved, the stability of plasma spectrum acquisition in the high-frequency laser paint removal process is improved, and the application and development of the high-frequency laser technology in the LIBS paint removal detection field are promoted.
(3) The invention adopts high-frequency nanosecond pulse laser to carry out plane scanning, considers the paint removal effect and the paint removal efficiency, can stably and effectively excite the plasma of the paint layer, and reduces the system cost and avoids secondary damage compared with a double-laser-beam working mode.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of the cleaning system of the present invention;
fig. 3 is a schematic view of the plasma of the present invention.
Wherein: 1. a control cabinet; 2. a laser cleaning system; 3. a spectrum acquisition system; 4. an industrial personal computer; 5. a dust removal system.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 3 in the embodiment of the present invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Examples
As shown in fig. 1, a high-frequency laser paint removal effect detection system comprises a system control board card, a high-frequency laser controller, a laser cleaning system 2, a spectrum acquisition system 3, a sample stage and an industrial personal computer 4; the system control board card is used for regulating and controlling the high-frequency laser controller; the high-frequency laser controller is connected with a high-frequency L1 laser through an optical fiber and drives the L1 laser to emit laser.
As shown in fig. 2, the laser cleaning system 2 includes: an L1 laser, a reflector, a galvanometer and a focusing field lens; a sample stage is arranged below the L1 laser and is arranged on a portable support; the high-frequency laser beam emitted by the L1 laser device is reflected by the reflector, and then sequentially passes through the vibrating mirror and the focusing field lens, the incident direction is perpendicular to the paint surface, the focusing field lens focuses the light beam output by the vibrating mirror and acts on the surface of the paint layer, the distance range from the focusing field lens to the surface of the paint layer is 150-300mm, the distance from the focusing field lens to the surface of the paint layer is adjusted through the portable support according to the paint removal requirements of different paint layer systems, the paint removal effects of different focusing positions are obtained, and the best position of the field lens is further determined.
The reflecting mirror adjusts a light beam path, the reflecting mirror refracts a vertical incident light beam into a horizontal light beam so that the light beam enters the vibrating mirror, the vibrating mirror comprises an X scanning vibrating mirror group, a Y scanning vibrating mirror group and an electronic driving amplifier, the vibrating mirror is electrically connected with the system control board card, the driving amplifier receives an action instruction of the control board card and drives the optical reflecting mirror to operate so as to realize deflection of the laser beam on an X-Y plane, a light beam entrance port of the vibrating mirror is positioned on the side of the vibrating mirror device, the incident light beam needs to be horizontally injected, and the laser cleaning system is light in design.
The spectrum collection system 3 includes: the device comprises a Glan prism, a collecting lens, an optical filter, an optical fiber and a spectrometer; plasma light generated in the high-frequency laser paint removal process sequentially passes through a Glan prism, a collecting lens, an optical filter, an optical fiber and a spectrometer, the Glan prism is located on the side of the sample table and is installed on a three-dimensional rotary table, the Glan prism is erected at one end of a three-axis screw rod sliding table, the three-axis screw rod sliding table is a common screw rod module, and two groups of right-angle moving sliding table modules are spliced and used for inhibiting continuous spectrum intensity caused by high-frequency laser paint removal; the three-dimensional rotary table is used for multi-angle and multi-direction fixed collection path equipment, and facilitates spectrum collection. The three-dimensional rotary table is a common rotary table for semi-physical simulation and test in the fields of aviation and aerospace, plays a key role in the development of aircrafts, and can simulate various attitude angle motions of the aircrafts. The collecting lens is positioned on one side of the Glan prism, reduces plasma emission light and prevents a spectrometer from collecting signal saturation, the collecting lens has different focusing characteristics on various wavelengths of plasma light, the relative positions of the plasma, the Glan prism, the collecting lens, the optical filter and the end face of the optical fiber must be strictly set to achieve high coupling efficiency, the spectrum collecting system inhibits continuous spectrum intensity generated by continuous paint removal through the Glan prism, the plasma emission light is focused through the collecting lens, the optical filter is used for filtering the plasma emission light focused by the collecting lens, the plasma emission light passing through the optical filter meets the paint removal requirement and is beneficial to the spectrometer to generate a plasma spectrum, one end of the optical fiber is arranged on one side of the optical filter, the other end of the optical fiber is connected with the spectrometer, the optical filter reduces the plasma emission light and transmits the plasma emission light to the spectrometer through the optical fiber, and the spectrometer performs light splitting processing on the plasma emission light generated by laser paint removal to generate the plasma spectrum. The plasma formed over the paint removal region includes a plasma region, a shock wave region and an energy absorbing region, as shown in fig. 3.
The industrial personal computer 4 is connected with the system control board card, the high-frequency laser controller and the spectrometer; the industrial personal computer 4 comprises a time sequence control module, a data analysis module and a closed-loop control module; the industrial personal computer is internally provided with a memory, can establish a laser cleaning process database and calls the database in real time according to the cleaning requirement; the time sequence control module sets the action time sequence of the high-frequency laser controller and the spectrometer, the collection action of the spectrometer is delayed relative to the light emitting action of the laser, and the spectrum is collected intermittently at multiple points in the paint removing process; the data analysis module identifies the primer and the finish of the paint layer through the spectral information and detects the paint removal effect according to the real-time element spectral characteristic information of the paint layer; and the closed-loop control module distinguishes the spectrum quality degree of the plasma associated with the paint removing process according to the spectrum data fed back by the data analysis module, synchronously and orthogonally optimizes process parameters, and generates plasma emission light.
The dust removal system 5 includes: the adsorption unit, the output intercommunication of adsorption unit has flexible rubber hose, L1 laser light-emitting action triggers the work of adsorption unit, inhale flexible rubber hose by impurity and waste gas that the adsorption unit will remove the lacquer process and produce, flexible rubber hose's collection mouth sets up to the annular hose, the annular pipe center is the laser beam action point promptly, a plurality of suction holes are opened towards center point one side to the annular pipe, the high velocity air current forms the air curtain on the surface of lacquer layer, reduce external environment to laser energy's loss, improve plasma excitation efficiency, weaken the influence of external unstable factor to spectral feature signal collection, avoid the gasification thing to pollute the focusing field mirror simultaneously.
The device can be carried on mechanisms such as a mobile platform and a truss, meets the requirement of in-situ cleaning of the whole aircraft and the paint layer of a part, is not limited by a field, and is portable and movable.
The invention also provides a detection method of the high-frequency laser paint removal effect detection system, which improves the path and the excitation environment of the spectrum acquisition system by setting the process parameters and optimizing the action time sequence of the spectrometer and the L1 laser, and comprises the following specific steps:
s1: the closed-loop control module of the industrial personal computer outputs an action instruction to the system control clamping plate, the system control clamping plate finishes parameter writing by editing a page by the industrial personal computer, drives the L1 laser to emit light, adjusts the distance between the focusing field lens and the surface of the paint layer through the three-axis lead screw sliding table according to the paint removal requirements of different paint layer systems, obtains the paint removal effects of different focusing positions, and determines the position of the optimal focusing field lens; the output wavelength of the high-frequency laser is 1064 nm, the average power is 0 to 120W, the pulse width is 60 to 350 ns, the repetition frequency is 1 to 1000 kHz, the single-pulse energy is 1.33 mJ, and the diameter of a light spot is 50 mu m.
S2: after the position of the focusing field lens is determined, a time sequence control module of the industrial personal computer sets the time delay of the acquisition action of the spectrometer relative to the light emitting action of the laser, and the spectrum is acquired intermittently at multiple points in the paint removing process, so that the intermittent time is adjustable, and the problem of difficulty in acquiring the plasma spectrum in the high-frequency laser paint removing process is solved.
The closed-loop control module of the industrial personal computer feeds back spectral data according to the data analysis module, distinguishes the plasma spectrum quality degree associated with the paint removal process, synchronously and orthogonally optimizes process parameters, generates relatively stable plasma emission light, so as to explore the plasma spectrum evolution rule, further narrow the peak power density range meeting the emission plasma linear spectrum, and determine the range of the plasma emission linear spectrum process parameters (A1), so as to solve the problem that the heat radiation mechanism and the plasma breakdown mechanism are mutually constrained in the paint removal process. A1: the laser power variation range is 20-40W, the frequency variation range is 60-95kHz, the pulse width variation range is 260-350 ns, the scanning speed variation range is 1500-2000 mm/s, namely the peak power density regulation range is 3.06 multiplied by 10 7 -1.31×10 8 W/cm 2 。
And the industrial personal computer data analysis module processes the plasma spectrum data to feed back the paint removal effect. And the closed-loop control module orthogonally optimizes the process parameters according to the matching degree of the paint removal effect and the spectral information fed back by the data analysis module, reduces the range of the linear spectral process parameter (A2) of the emitted plasma, further determines the range of the laser paint removal process parameter A2, and obtains available plasma spectral data with A1 being more than A2, thereby taking the paint removal effect and the paint removal efficiency into consideration. A2: the laser power variation range is 30-38W, the frequency variation range is 68-92kHz, the pulse width variation range is 265-350 ns, the scanning speed variation range is 1800-2000 mm/s, namely the peak power density regulation range is 4.74 multiplied by 10 7 -1.07×10 8 W/cm 2 。
And in the paint removing process parameter regulating and controlling process, if the element spectrum information of the paint layer to be removed has no response, the matrix element spectrum information has a weak spectrum peak, and the paint layer to be removed is considered to be removed. Wherein the non-removed layer is taken as a substrate. At the moment, the spectrum acquisition system feeds back a signal to the industrial personal computer, a closed-loop control module of the industrial personal computer stops the regulation of the process parameters, and the process parameters are called to remove paint; if the technological parameters of the paint layer system are determined, the parameter combination of the cleaning database is directly called, and the technological parameters are not required to be regulated and controlled by an industrial personal computer.
High pulse repetition frequency, 10 khz, due to laser depainting 6 W / cm 2 An order of magnitude lower peak power density will result in a tendency of the paint removal process to radiate heat. Thermal radiation may result in a significant continuum of spectra that are not available, rather than a line-shaped emission line as reflected by plasma breakdown.
When the peak power density of the high-frequency laser reaches the threshold value of exciting the plasma of the paint layer, the plasma spectrum in the laser paint removal process can be collected and used for detecting the paint removal process, and the threshold value of the linear spectrum of the plasma excited by the paint layer system is 3.06 multiplied by 10 7 W/cm 2 。
S3: the plasma spectrum characteristic signal inhibits the continuous spectrum intensity generated by continuous paint removal through the Glan prism, the plasma emission light is focused through the collecting lens, the plasma emission light is weakened through the optical filter and is transmitted to the spectrometer through the optical fiber, a plasma spectrum is generated, and the spectrum data is transmitted to the data analysis module.
The collecting lens has chromatic aberration having different focusing characteristics for various wavelengths of the plasma emission light, and therefore, it is necessary to strictly set imaging conditions to prevent the plasma emission light from being partially cut off. The spectral acquisition system must strictly set the relative positions of the glan prism, the acquisition lens, the optical filter and the optical fiber end face, and ensure accurate alignment to achieve high coupling efficiency. The plasma emission light passing through the Glan prism is sequentially vertically incident to the collecting lens, and the collecting lens, the optical filter and the optical fiber end face are mutually parallel and coaxial, so that the spectrometer effectively collects the stable plasma spectrum which can meet the paint removal requirement.
S4: on the basis of finishing process parameter regulation and optimizing action time sequences of the spectrograph and the laser, the data analysis module of the industrial personal computer establishes the relation among the spectral data, the paint removal effect and the process parameters by using a machine learning algorithm, and transmits the information to the closed-loop control module to form closed-loop control, finish plasma spectrum excitation and collection of a high-frequency laser paint removal process, and analyze the types and the contents of elements according to the wavelength position and the intensity area of a paint layer element spectral line to detect the paint removal effect.
The paint removal modes are divided into three types: removing the airplane skin polyurethane finish/epoxy primer paint layer system; removing the polyurethane finish paint of the airplane skin; and removing the aircraft skin epoxy primer.
Parameters of a paint layer system: the thickness of a white polyurethane finish/yellow epoxy primer paint layer system is 90-110 mu m; the thickness of the white polyurethane finish paint is 55 to 65 mu m; the thickness of the yellow epoxy primer is 35 to 45 mu m; the aluminum alloy aircraft skin substrate is 2024 aluminum alloy.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
In addition, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods associated with the documents. In case of conflict with any incorporated document, the present specification will control.
Claims (10)
1. A high-frequency laser paint removal effect detection system is characterized by comprising a system control board card, a high-frequency laser controller, a laser cleaning system (2), a spectrum acquisition system (3), a sample stage and an industrial personal computer (4);
the laser cleaning system (2) comprises an L1 laser, a reflector, a galvanometer and a focusing field lens which are arranged in sequence; the high-frequency laser controller is electrically connected with the L1 laser and is used for driving the L1 laser to emit high-frequency laser; high-frequency laser emitted by the L1 laser is reflected by a reflector and then sequentially passes through a vibrating mirror and a focusing field lens to be focused on the surface of a sample paint layer on the sample table; the galvanometer is electrically connected with the system control board card;
the spectrum collection system (3) comprises a Glan prism, a collection lens, an optical filter, an optical fiber and a spectrometer which are sequentially arranged, and plasma emission light generated on the surface of the sample paint layer sequentially passes through the Glan prism, the collection lens, the optical filter, the optical fiber and the spectrometer; the spectrometer is used for carrying out light splitting treatment on the plasma emission light to generate a plasma spectrum;
the industrial personal computer (4) is electrically connected with the system control board card, the high-frequency laser controller and the spectrometer; the industrial personal computer (4) is used for setting the action time sequence of the spectrometer and the L1 laser, and the paint layer is identified and technological parameters are synchronously regulated and controlled by collecting real-time element spectral characteristic signals of the paint layer transmitted by the spectrometer so as to detect the paint removal effect.
2. The system for detecting the paint removing effect of the high-frequency laser according to claim 1, further comprising a three-axis lead screw sliding table; the focusing field lens is erected on the table top of the three-shaft screw rod sliding table and used for adjusting the distance between the focusing field lens and the surface of the paint layer; and a three-dimensional rotary table is erected at one end of the three-axis lead screw sliding table, and the Glan prism is erected on the three-dimensional rotary table.
3. The system for detecting paint removal effect of high frequency laser as claimed in claim 1, wherein said optical fiber end face is a cross section of optical fiber at a side of said optical fiber close to said optical filter, plasma emitted light passing through said Glan prism is incident perpendicularly to a collecting lens, and said collecting lens, optical filter and optical fiber end face are parallel and coaxial with each other.
4. The high-frequency laser paint removal effect detection system according to claim 1, wherein the industrial personal computer comprises a time sequence control module, a data analysis module and a closed-loop control module; the time sequence control module sets the action time sequence of the high-frequency laser controller and the spectrometer, the collection action of the spectrometer is delayed relative to the light emitting action of the laser, and the spectrum is collected intermittently at multiple points in the paint removing process; the data analysis module identifies the primer and the finish of the paint layer through spectral information acquired by the spectrometer, and detects the paint removal effect according to real-time element spectral characteristic information of the paint layer; and the closed-loop control module distinguishes the spectrum quality degree of the plasma associated with the paint removing process according to the spectrum data fed back by the data analysis module, synchronously and orthogonally optimizes process parameters, and generates plasma emission light.
5. The high-frequency laser paint removal effect detection system according to claim 1, characterized by further comprising an adsorption unit, wherein an output end of the adsorption unit is communicated with a rubber hose, and light emitting action of the L1 laser triggers the adsorption unit to work so as to suck impurities and waste gas generated in a paint removal process into the rubber hose.
6. The detection method of the high-frequency laser paint removal effect detection system based on any one of claims 1 to 5 is characterized by comprising the following specific steps:
s1: the industrial personal computer (4) outputs an action instruction to the system control clamping plate, drives the L1 laser to emit light, adjusts the distance between the focusing field lens and the surface of the paint layer through the portable support according to the paint removal requirements of different paint layer systems, obtains the paint removal effect of different focusing positions, and determines the optimal focusing field lens position;
s2: after the position of the focusing field lens is determined, the industrial personal computer (4) sets the time delay of the acquisition action of the spectrograph relative to the light emitting action of the laser, and the spectrum is intermittently acquired at multiple points in the paint removing process, the quality degree of the plasma spectrum associated with the paint removing process is judged according to the spectrum data fed back by the industrial personal computer (4), the process parameters are synchronously and orthogonally optimized, and plasma emission light is generated;
s3: the spectrometer performs light splitting treatment on plasma emission light generated by laser paint removal to generate a plasma spectrum and generate a spectral characteristic signal;
s4: the action time sequence of the spectrometer and the L1 laser is set through the industrial personal computer (4), real-time element spectral characteristic signals of a paint layer transmitted by the spectrometer are collected, and the types and the content of elements are analyzed according to the wavelength position and the intensity area of the paint layer element spectral line so as to detect the paint removal effect.
7. The detection method of the high-frequency laser paint removal effect detection system according to claim 6, wherein the optimal range of the process parameters is as follows: the laser power variation range is 30-38W, the frequency variation range is 68-92kHz, the pulse width variation range is 265-350 ns, the scanning speed variation range is 1800-2000 mm/s, namely the peak power density regulation range is 4.74 multiplied by 10 7 -1.07×10 8 W/cm 2 。
8. The detection method of the high-frequency laser paint removal effect detection system according to claim 6, wherein the data analysis module establishes a relation among the spectral data, the paint removal effect and the process parameters by using a machine learning algorithm, and transmits the information to the closed-loop control module to form closed-loop control, so as to complete plasma spectrum excitation and collection in the high-frequency laser paint removal process.
9. The detection method of the high-frequency laser paint removal effect detection system according to claim 6, wherein the types of paint removal comprise: and removing the airplane skin polyurethane finish paint and the epoxy primer paint layer system, and removing the airplane skin polyurethane finish paint or removing the airplane skin epoxy primer paint.
10. The detection method of the high-frequency laser paint removal effect detection system as claimed in claim 6, wherein the parameters of the paint layer system are as follows: the thickness of a white polyurethane finish/yellow epoxy primer paint system is 90-110 mu m; the thickness of the white polyurethane finish paint is 55 to 65 mu m; the thickness of the yellow epoxy primer is 35 to 45 mu m; the aluminum alloy aircraft skin base body is 2024 aluminum alloy.
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