Method and device for regulating laser light source for cleaning cultural relics and electronic product

Abstract

The application relates to the technical field of laser cleaning, and provides a regulation method and device of a laser light source for cultural relic cleaning and electronic products, the method comprising the following steps: acquiring a preliminary laser with a fixed wavelength; acquiring feature information of a cultural relic surface to be cleaned, and determining working parameters of the laser according to the feature information; performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers; performing space-time regulation on the plurality of intermediate lasers according to the working parameters to obtain a plurality of target lasers; and the time and / or space of at least two target lasers in the plurality of target lasers reaching the cultural relic surface to be cleaned meet preset requirements. Through the above method, the application can realize composite control of output laser parameters, can adjust the time domain, space domain and frequency domain characteristics of the laser light field interacting with the material according to the characteristics of different types of cultural relics to be cleaned, and realizes efficient cleaning of different types of cultural relics.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cleaning, and in particular to a control method, device and electronic product of a laser light source for cleaning cultural relics. Background Art

[0002] Traditional methods for cleaning the surface of cultural relics include mechanical cleaning, chemical cleaning, ultrasonic cleaning, and steam cleaning. These traditional methods will more or less cause irreversible damage to the cultural relics during the cleaning process. They also have inevitable disadvantages such as the instability of manual techniques and environmental pollution. They cannot achieve automation and fine cleaning, and the cleaning efficiency is low. With the development of laser technology and its widespread application in the industrial field, laser cleaning technology has become a cleaning technology used in the restoration of historical relics due to its unique advantages such as object selectivity, environmental friendliness, non-contact, controllable, high stability, and fine cleaning. It provides the possibility of achieving non-destructive and harmless cleaning of contaminants on the surface of cultural relics.

[0003] Laser cleaning technology is a novel cleaning technique based on the interaction between lasers and materials. It offers advantages such as selectivity, controllability, high stability, strong adaptability, and precise cleaning. The principle of laser cleaning of cultural relics is that a laser beam is focused onto a very small area through a combination of focusing lenses, forming a high-energy laser beam that disrupts the interaction between the contaminant and the cultural relic substrate. Through processes such as photo-stripping, vaporization, and ultrasonic waves, the contaminant is removed from the surface without damaging the substrate, achieving the cleaning purpose.

[0004] The light sources of current laser cleaning devices for cultural relics are mostly single-wavelength nanosecond laser sources, which have weak scalability for cleaning cultural relics of different materials and physical and chemical properties. Summary of the Invention

[0005] The present invention provides a control method, device and electronic product for a laser light source for cleaning cultural relics, so as to solve the technical problem of weak scalability of single-wavelength laser light sources in the prior art.

[0006] The present invention provides a control method for a laser light source for cleaning cultural relics, comprising: obtaining a preliminary laser with a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining operating parameters of the laser according to the characteristic information; performing frequency conversion and energy regulation on the preliminary laser according to the operating parameters to obtain a plurality of intermediate lasers; performing temporal and spatial control on the plurality of intermediate lasers according to the operating parameters to obtain a plurality of target lasers; wherein the time and / or space at which at least two of the plurality of target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0007] According to the present invention, a method for controlling a laser light source for cleaning cultural relics is provided. After a plurality of target lasers are obtained by temporally and spatially controlling a plurality of intermediate lasers according to operating parameters, the method further includes: using the plurality of target lasers to perform laser cleaning on the surface of the cultural relic to be cleaned, and monitoring the laser energy status of the surface of the cultural relic to be cleaned at the current operating moment; adjusting the laser operating parameters according to the laser energy status; and obtaining the target laser at the next operating moment according to the adjusted operating parameters.

[0008] According to a method for controlling a laser light source for cleaning cultural relics provided by the present invention, a primary laser is subjected to frequency conversion and energy adjustment according to operating parameters to obtain multiple intermediate lasers, including: after frequency conversion of the primary laser according to the operating parameters, multiple intermediate lasers are obtained, and the laser energy of each intermediate laser is adjusted; wherein the laser energy of at least two intermediate lasers is different.

[0009] According to the present invention, a method for controlling a laser light source for cleaning cultural relics is provided. Multiple intermediate lasers are temporally and spatially controlled according to operating parameters to obtain multiple target lasers. The method includes: temporally controlling the multiple intermediate lasers according to the operating parameters so that the time it takes for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets preset time requirements; and spatially controlling the multiple intermediate lasers according to the operating parameters so that the light beam space of at least two intermediate lasers transmitted to the surface of the cultural relic to be cleaned meets preset spatial requirements.

[0010] According to a method for controlling a laser light source for cleaning cultural relics provided by the present invention, multiple intermediate lasers include a first intermediate beam, a second intermediate beam, and a third intermediate beam; the wavelengths of the first intermediate beam, the second intermediate beam, and the third intermediate beam are different; the time for the first intermediate beam, the second intermediate beam, and the third intermediate beam to be transmitted to the surface of the cultural relic to be cleaned is the same; and the first intermediate beam, the second intermediate beam, and the third intermediate beam are coaxially transmitted during the process of being transmitted to the surface of the cultural relic to be cleaned.

[0011] According to the present invention, a control method for a laser light source for cleaning cultural relics is provided. The method monitors the laser energy status on the surface of the cultural relic to be cleaned at the current working moment and adjusts the operating parameters of the laser according to the laser energy status. The method includes: determining the temporal and spatial intensity distribution of the laser beam based on the spot size and intensity distribution on the surface of the cultural relic to be cleaned; comparing the temporal and spatial intensity distribution with the expected temporal and spatial intensity distribution determined based on the operating parameters to obtain an optimization factor; and adjusting the operating parameters of the laser according to the optimization factor.

[0012] The present invention also provides a control device for a laser light source for cleaning cultural relics, comprising: a laser generating unit for obtaining a preliminary laser of a fixed wavelength; a working parameter determining unit for obtaining characteristic information of the surface of the cultural relic to be cleaned and determining the working parameters of the laser based on the characteristic information; a frequency conversion and energy control unit for performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain multiple intermediate lasers; and a beam time and space control unit for performing time and space control on the multiple intermediate lasers according to the working parameters to obtain multiple target lasers; wherein the time and / or space at which at least two of the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0013] The present invention also provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, a method for controlling a laser light source for cleaning cultural relics as described above is implemented.

[0014] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for controlling a laser light source for cleaning cultural relics as described in any one of the above is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, which, when executed by a processor, implements any of the above-described methods for controlling a laser light source for cleaning cultural relics.

[0016] The present invention provides a method, device, and electronic product for controlling a laser light source for cleaning cultural relics. The method comprises: obtaining a preliminary laser of a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining the operating parameters of the laser based on the characteristic information; frequency conversion and energy adjustment of the preliminary laser based on the operating parameters to obtain multiple intermediate lasers; temporal and spatial control of the multiple intermediate lasers based on the operating parameters to obtain multiple target lasers; wherein the time and / or space at which at least two of the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements. Through the above-mentioned method, the present invention can achieve composite control of the output laser parameters, and can specifically adjust the time, space, and frequency domain characteristics of the laser light field interacting with the material according to the characteristics of different types of cultural relics to be cleaned, thereby achieving efficient cleaning of different types of cultural relics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The figure is a flow chart of a method for controlling a laser light source for cleaning cultural relics provided by an embodiment of the present invention.

[0019] Figure 2 This is a block diagram of the composition of the composite parameter controlled ultrashort laser light source provided by an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of light beam frequency conversion provided by an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of an energy control subunit provided in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of composite laser time control provided by an embodiment of the present invention.

[0023] Figure 6 It is a schematic diagram of the spatial control of composite laser provided by an embodiment of the present invention.

[0024] Figure 7 Schematic diagram of a monitoring and feedback control unit provided by an embodiment of the present invention.

[0025] Figure 8 The figure is a schematic structural diagram of a control device for a laser light source for cleaning cultural relics provided by an embodiment of the present invention.

[0026] Figure 9 It is a schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0032] At present, laser cleaning technology has been successfully applied to the laser cleaning of stone, metal, oil paint, paper and other cultural relics. Among the related technologies, laser cleaning technology may also have the following problems:

[0033] 1. The light source of the cultural relic laser cleaning device is mostly a single-wavelength nanosecond laser source, which has weak scalability for cleaning cultural relics of different materials and physical and chemical properties.

[0034] 2. For artifacts of different colors, depending on their laser absorption rates, different laser wavelengths are required to achieve efficient laser cleaning. For example, stone artifacts are generally cleaned with a 1064nm Nd:YAG nanosecond laser, while painted and oil-painted artifacts are often cleaned with a 355nm Nd:YAG nanosecond laser. There are also proposals for cleaning artifacts using erbium-doped 2.9μm lasers.

[0035] 3. For artifacts made of different materials, in addition to using a single wavelength for laser cleaning, a combination of multiple wavelengths is required to achieve non-destructive cleaning. For example, using a 1064nm nanosecond laser to clean stone artifacts can cause yellowing, but using a combination of 1064nm and 355nm lasers can mitigate this discoloration. Therefore, the cleaning process requires the combination of multiple wavelengths and the control of multiple wavelength laser output, a feature that current cleaning machines generally lack.

[0036] Therefore, in the related art, laser cleaning devices for cultural relics generally use a single-wavelength nanosecond light source, and it is necessary to select laser light sources with different output wavelengths according to the characteristics of cultural relics of different types and materials. In response to the problem that the light sources used in the above cultural relic laser cleaning devices are not suitable for cleaning multiple types of cultural relics, the present invention provides a control method for a laser light source for cultural relic cleaning, which can obtain a composite parameter-controlled ultrashort laser light source for cultural relic cleaning. It can finely control the output laser parameters from multiple dimensions such as output wavelength, time domain intensity distribution, and spatial domain intensity distribution, so as to achieve the cleaning of multiple types of cultural relics with a single laser cleaning device, while minimizing the adverse effects of the cleaning process, and providing a foundation for the application of laser cleaning technology and devices in the field of cultural relic protection.

[0037] See also Figure 1 , Figure 1 : This is a flow chart of a method for controlling a laser light source for cleaning cultural relics provided by an embodiment of the present invention. In this embodiment, the method for controlling a laser light source for cleaning cultural relics may include steps S110 to S140, each of which is specifically as follows:

[0038] S110: Obtain preliminary laser light of a fixed wavelength.

[0039] S120: Acquire characteristic information of the surface of the cultural relic to be cleaned, and determine the working parameters of the laser according to the characteristic information.

[0040] S130: performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers.

[0041] S140: Temporally and spatially control the multiple intermediate lasers according to the working parameters to obtain multiple target lasers; wherein the time and / or space when at least two target lasers among the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0042] The primary laser can be a nanosecond pulsed laser source, or an ultrashort laser source such as a picosecond or femtosecond pulse. In this embodiment, the output laser parameters interacting with the artifact material can be specifically adjusted based on the characteristics of the artifact being cleaned, including the output laser wavelength, energy / power, spot size, and the temporal and spatial intensity distribution of the laser light field, achieving efficient cleaning of different types of artifacts. The core of this light source is the temporal and spatial intensity distribution of the composite wavelength laser beam used for artifact cleaning, as well as its controllable means, enabling controllable laser beam output from a single laser cleaning source to meet varying cleaning requirements.

[0043] The composite parameter-controlled spatiotemporal intensity distribution of the output beam of the ultrashort laser light source not only includes the laser energy and beam size that can be adjusted by conventional lasers, but also enables multi-parameter composite control and output to achieve optimized cleaning of different materials. For example, in terms of laser wavelength, it can not only output the fundamental frequency 1064nm laser and 532nm, 355nm and other frequency-doubled lasers separately, but also output any combination of the above wavelength lasers; in terms of the temporal distribution of the composite laser, lasers of different wavelengths can be output simultaneously in time, and the order and interval of the different wavelength lasers when interacting with the material can also be adjusted as needed; in terms of the spatial distribution of the composite laser, the spot size and spatial intensity distribution of the different wavelength lasers on the surface to be cleaned can be individually adjusted as needed.

[0044] Optionally, the multiple intermediate lasers include a first intermediate beam, a second intermediate beam, and a third intermediate beam; the wavelengths of the first intermediate beam, the second intermediate beam, and the third intermediate beam are different; the time for the first intermediate beam, the second intermediate beam, and the third intermediate beam to be transmitted to the surface of the cultural relic to be cleaned is the same; the first intermediate beam, the second intermediate beam, and the third intermediate beam are coaxially transmitted during the process of being transmitted to the surface of the cultural relic to be cleaned.

[0045] It should be noted that in some embodiments, the number of intermediate laser beams used may exceed three, and the specific number should be set based on the actual application requirements. The coaxial transmission and simultaneous arrival of three beams is a special case of spatiotemporal control. In other embodiments, the spatial arrangement and arrival times of the three beams are adjustable. Those skilled in the art can adjust and configure the spatial positions and temporal sequence of the three beams based on the specific application scenario and requirements.

[0046] Based on any of the above embodiments, the steps after performing spatiotemporal control on the multiple intermediate lasers according to the working parameters to obtain the multiple target lasers may further include:

[0047] Laser cleaning is performed on the surface of the cultural relic to be cleaned using multiple target lasers, and the laser energy situation of the surface of the cultural relic to be cleaned at the current working moment is monitored; the laser working parameters are adjusted according to the laser energy situation; and the target laser at the next working moment is obtained according to the adjusted working parameters.

[0048] See also Figure 2 , Figure 2 This is a block diagram of the components of the composite parametric controlled ultrashort laser source provided by an embodiment of the present invention. The composite parametric controlled ultrashort laser source comprises a fundamental frequency ultrashort laser source, a frequency conversion unit and an energy control unit, a beam temporal and spatial control unit, and a monitoring and feedback control unit.

[0049] Based on this, an embodiment of the present invention proposes a new composite parameter-controlled laser cleaning light source, which can realize controllable composite laser time-space distribution output, and is expected to realize laser cleaning of multiple types of cultural relics with a single laser light source.

[0050] (1) Fundamental frequency ultrashort laser source

[0051] The fundamental frequency ultrashort laser outputs a fixed-wavelength ultrashort laser beam for laser cleaning. This laser can be an Nd:YAG solid-state laser used for laser cleaning, outputting a fundamental frequency laser beam at a wavelength of 1064nm. Alternatively, it can be an Yb-doped fiber laser with a fundamental wavelength of 1030nm. Alternatively, it can be a thulium- or erbium-doped medium-wave infrared laser.

[0052] Preferably, in order to achieve better composite parameter control (especially the temporal and spatial intensity distribution control of the laser light field), the fundamental frequency ultrashort laser source laser can output ultrashort laser with a picosecond or femtosecond pulse width.

[0053] (2) Frequency conversion unit and energy control unit

[0054] On the one hand, the frequency conversion and energy control unit converts the fundamental frequency laser output by the fundamental frequency laser into lasers of other wavelengths through frequency conversion technology, which is used to expand the available wavelength of the light source; on the other hand, it realizes independent control of the energy of lasers with different wavelengths through the frequency change process and the addition of energy regulation components.

[0055] Based on any of the above embodiments, the step of performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain multiple intermediate lasers may specifically include:

[0056] After the frequency of the primary laser is converted according to the working parameters, a plurality of intermediate lasers are obtained, and the laser energy of each intermediate laser is adjusted; wherein the laser energy of at least two intermediate lasers is different.

[0057] The frequency conversion unit and the energy control unit can be divided into a frequency conversion subunit and an energy control subunit.

[0058] The frequency conversion subunit can utilize a nonlinear crystal (such as KDP or LBO) to achieve frequency doubling of the fundamental frequency. For example, a 1064nm wavelength can be frequency-doubled to produce a 532nm laser. The 1064nm and 532nm wavelengths can then be summed to produce a 355nm laser. In this case, after frequency conversion, the laser light source can independently output 1064nm, 532nm, and 355nm laser beams, or, as needed, a composite of these three wavelengths.

[0059] See also Figure 3 , Figure 3 This is a schematic diagram of light beam frequency conversion provided by an embodiment of the present invention.

[0060] The fundamental frequency ultrashort laser generates preliminary laser, and through the cooperation of 1064 beam splitter, 532 beam splitter, 355 total reflection mirror, frequency doubling unit and sum frequency unit, a three-wavelength laser composite form can be obtained.

[0061] The 1064 beam splitter can split a 1064 nm laser beam into two beams, one of which is emitted directly and the other is processed by a frequency doubling unit.

[0062] The 532 beam splitter can split a 532 nm laser beam obtained after being processed by the frequency doubling unit into two beams, one of which is emitted directly and the other is processed by the sum frequency unit.

[0063] The 355 total reflection mirror can emit a beam of 355-nanometer laser obtained after processing by the sum frequency unit through total reflection. The 355 total reflection mirror is a full lens that fully reflects other wavelengths, that is, it fully reflects light with a wavelength of 355 nanometers and completely transmits light of other wavelengths.

[0064] In other embodiments, the frequency conversion subunit may also be other nonlinear variation forms, such as optical parametric oscillator (OPO), which can convert fundamental frequency light into coherent laser outputs of two other frequencies according to frequency variation conditions.

[0065] The energy control subunit consists of two layers. The first is to control the intensity of the nonlinear frequency change process to achieve the energy level control of the generated lasers with different extended wavelengths. Taking the above-mentioned 1064nm laser to generate 532nm and 355nm lasers as an example, the energy of the 532nm laser can be controlled by controlling the frequency doubling conversion efficiency, while the energy of the 355nm laser can be controlled by controlling the sum frequency conversion efficiency.

[0066] In addition, the energy control subunit can also be realized by chemical devices. Figure 4 , Figure 4 Schematic diagram of an energy control subunit provided in an embodiment of the present invention.

[0067] After the three-wavelength output laser generates three-wavelength lasers, attenuation combiners such as neutral density attenuators, or / and half-wave plates and polarizers can be added to the output ends of the three-wavelength lasers to achieve independent adjustment and control of the output energy of each wavelength.

[0068] (3) Beam time and space control unit

[0069] The beam temporal and spatial control unit regulates the intensity and distribution of the laser beam interacting with the sample in both time and space. For example, using a composite laser beam capable of outputting three wavelengths (1064nm, 532nm, and 355nm) as an example, temporal control involves the timing and time intervals of the three composite laser beams interacting with the material surface. Spatial control involves controlling the center position of the composite laser beam at the material surface and the beam size. This, along with the aforementioned energy regulation, determines the intensity of the beam interacting with the material.

[0070] Based on any of the above embodiments, the step of performing spatiotemporal control on the multiple intermediate lasers according to the operating parameters to obtain the multiple target lasers may specifically include:

[0071] The multiple intermediate lasers are temporally controlled according to the operating parameters so that the time it takes for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets the preset time requirements; the multiple intermediate lasers are spatially controlled according to the operating parameters so that the beam space of at least two intermediate lasers transmitted to the surface of the cultural relic to be cleaned meets the preset spatial requirements.

[0072] Specifically, composite laser time control is achieved by adjusting the time when the three wavelength light beams are transmitted to the surface of the material to be cleaned, so as to control the time sequence and interval of the three wavelength lasers acting on the material surface. The most common time control result is that the three wavelength lasers reach the surface of the material at the same time.

[0073] Here, time delay can be increased or decreased by individually adding or reducing the three wavelength transmission optical paths (adding auxiliary optical paths and adding or reducing time delay lines corresponding to the wavelengths). Alternatively, it can be achieved by adding highly dispersive media of varying thicknesses and exploiting the differences in transmission time at different wavelengths. A combination of these two methods can also be used to achieve both large-scale coarse adjustment and fine-scale fine-tuning.

[0074] See also Figure 5 , Figure 5 This is a schematic diagram of composite laser time control provided by an embodiment of the present invention.

[0075] exist Figure 5 (a) shows that after the three-wavelength output laser generates three-wavelength laser, the time extension line of the first laser and the third laser is added by adding an auxiliary light path; Figure 5 (b) shows that after the three-wavelength output laser generates three-wavelength lasers, the time sequence and interval of the three-wavelength lasers acting on the material surface are controlled by adding a high-dispersion medium.

[0076] Specifically, compound laser spatial control refers to the adjustment of the spatial center position of the laser beam. Figure 6 , Figure 6 It is a schematic diagram of the spatial control of composite laser provided by an embodiment of the present invention.

[0077] The adjustment of the spatial center position of the three wavelength beams can be achieved by combining dichroic mirrors. For example, the spatial combination of 1064nm, 532nm and 355nm wavelength lasers can be achieved by combining a 1064nm total reflection mirror, a 1064nm anti-reflection mirror and a 532nm total reflection mirror, or a 1064nm and 532nm total reflection mirror and a 355nm total reflection mirror. Figure 6 By placing the three beams in the position shown in (a) and adjusting the reflection direction of the lens, the three beams can be precisely adjusted to transmit coaxially. Alternatively, the spatial positions of the three beam centers on the sample surface can be adjusted as needed to form other forms of spatially distributed composite lasers.

[0078] exist Figure 6 As shown in (b), the beam sizes of the three wavelength beams irradiated on the material surface can be adjusted by adding beam expansion and contraction lenses of respective wavelength bands at the output ends of the three wavelength beams to control the spatial size of each wavelength beam acting on the material surface.

[0079] (4) Monitoring and feedback control unit

[0080] The monitoring and feedback control unit measures the temporal and spatial intensity distribution of the laser beam on the sample surface to be cleaned and provides this information to the aforementioned energy control and temporal and spatial regulation unit for correction and adjustment. This unit primarily consists of laser energy monitoring, measurement of the temporal and spatial distribution of the beam irradiated on the sample surface, and a feedback control system.

[0081] Based on any of the above embodiments, the steps of monitoring the laser energy on the surface of the cultural relic to be cleaned at the current working moment and adjusting the laser operating parameters according to the laser energy may specifically include:

[0082] The temporal and spatial intensity distribution of the laser beam is determined based on the spot size and intensity distribution on the surface of the cultural relic to be cleaned; the temporal and spatial intensity distribution is compared with the expected temporal and spatial intensity distribution determined based on the working parameters to obtain an optimization factor; and the working parameters of the laser are adjusted based on the optimization factor.

[0083] See also Figure 7 , Figure 7 Schematic diagram of a monitoring and feedback control unit provided by an embodiment of the present invention.

[0084] Laser energy monitoring and the measurement of the temporal and spatial distribution of the beam irradiated on the sample surface are performed by a sampling mirror in conjunction with a laser energy meter, a photoelectric probe, and a beam profiler. Specifically, sampling mirror 1 can be configured to collect data using the laser energy meter, sampling mirror 2 to collect data using the photoelectric probe, and sampling mirror 3 to collect data using the beam profiler.

[0085] It should be noted that the optical path of the beam profiler and the sample to be cleaned behind the sampling mirror 3 should be consistent to ensure that the spot size and intensity distribution measured by the beam profiler are consistent with the spot irradiated on the sample surface.

[0086] The beam energy, time, and spatial distribution information obtained by the above monitoring units are processed by the information processing computer to obtain the temporal and spatial intensity distribution of the laser beam on the surface of the sample to be cleaned, which is then compared with the preset situation, and then the frequency conversion and energy control unit and the beam time and space control unit are feedback-controlled to make targeted adjustments until the temporal and spatial intensity distribution of the laser beam on the surface of the sample to be cleaned is the same as the preset situation.

[0087] As described above, the embodiments of the present invention provide a method for controlling a laser light source for cleaning cultural relics, which can obtain a composite parameter-controlled ultrashort laser light source for cleaning cultural relics. The core point lies in the composite control of the output laser parameters, including wavelength, energy, spot size, time characteristics, spatial characteristics, etc., and can specifically adjust the time domain, spatial domain and frequency domain characteristics of the laser light field interacting with the material according to the characteristics of different types of cultural relics to be cleaned, thereby achieving efficient cleaning of different types of cultural relics.

[0088] In addition, the core of the composite parameter-controlled ultrashort laser light source used for cultural relics cleaning lies in the fundamental frequency ultrashort laser, beam frequency conversion, energy adjustment of each wavelength beam, spot size adjustment, intensity distribution and adjustment of each wavelength beam in time and space, laser beam time on the sample surface, spatial intensity distribution measurement, parameter calculation and feedback control unit, etc. Through the parameter control and feedback of the composite laser acting on the material surface, the controllable output laser form of the composite laser light field is realized, thereby achieving efficient cleaning of different types of cultural relics samples.

[0089] The present invention also provides a control device for a laser light source for cleaning cultural relics. The control device for the laser light source for cleaning cultural relics provided by the present invention is described below. The control device for the laser light source for cleaning cultural relics described below and the control method for the laser light source for cleaning cultural relics described above can be referenced to each other.

[0090] See also Figure 8 , Figure 8 This is a schematic diagram of the structure of a laser light source control device for cleaning cultural relics, provided by an embodiment of the present invention. The laser light source control device for cleaning cultural relics may include a laser generating unit 810, an operating parameter determining unit 820, a frequency conversion and energy control unit 830, and a beam temporal and spatial control unit 840.

[0091] The laser generating unit 810 is used to obtain preliminary laser light of a fixed wavelength.

[0092] The working parameter determination unit 820 is used to obtain characteristic information of the surface of the cultural relic to be cleaned and determine the working parameters of the laser according to the characteristic information.

[0093] The frequency conversion and energy control unit 830 is used to perform frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain multiple intermediate lasers.

[0094] The beam time and space control unit 840 is used to perform time and space control on multiple intermediate lasers according to working parameters to obtain multiple target lasers; wherein the time and / or space when at least two target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0095] Based on any of the above embodiments, the control device of the laser light source for cleaning cultural relics may also include a monitoring and feedback control unit, which may be used to: use multiple target lasers to perform laser cleaning on the surface of the cultural relics to be cleaned, and monitor the laser energy conditions of the surface of the cultural relics to be cleaned at the current working moment; adjust the laser working parameters according to the laser energy conditions; and obtain the target laser at the next working moment according to the adjusted working parameters.

[0096] Based on any of the above embodiments, the frequency conversion and energy control unit 830 may be specifically configured to:

[0097] After the frequency of the primary laser is converted according to the working parameters, a plurality of intermediate lasers are obtained, and the laser energy of each intermediate laser is adjusted; wherein the laser energy of at least two intermediate lasers is different.

[0098] Based on any of the above embodiments, the beam temporal and spatial control unit 840 can be specifically used to:

[0099] The multiple intermediate lasers are temporally controlled according to the operating parameters so that the time it takes for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets the preset time requirements; the multiple intermediate lasers are spatially controlled according to the operating parameters so that the beam space of at least two intermediate lasers transmitted to the surface of the cultural relic to be cleaned meets the preset spatial requirements.

[0100] Based on any of the above embodiments, the multiple intermediate lasers include a first intermediate beam, a second intermediate beam, and a third intermediate beam; the wavelengths of the first intermediate beam, the second intermediate beam, and the third intermediate beam are different; the time for the first intermediate beam, the second intermediate beam, and the third intermediate beam to be transmitted to the surface of the cultural relic to be cleaned is the same; the first intermediate beam, the second intermediate beam, and the third intermediate beam are coaxially transmitted during the process of being transmitted to the surface of the cultural relic to be cleaned.

[0101] Based on any of the above embodiments, the monitoring and feedback control unit may also be used to:

[0102] The temporal and spatial intensity distribution of the laser beam is determined based on the spot size and intensity distribution on the surface of the cultural relic to be cleaned; the temporal and spatial intensity distribution is compared with the expected temporal and spatial intensity distribution determined based on the working parameters to obtain an optimization factor; and the working parameters of the laser are adjusted based on the optimization factor.

[0103] On the other hand, an embodiment of the present invention further provides an electronic device, see Figure 9 , Figure 9 is a schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Figure 9 As shown, the electronic device may include a memory 920, a processor 910, and a computer program stored in the memory 920 and executable on the processor 910. When the processor 910 executes the program, the control method of the laser light source for cleaning cultural relics provided by the above methods is implemented.

[0104] Optionally, the electronic device may further include a communication bus 930 and a communication interface (CommunicationsInterface) 940, wherein the processor 910, the communication interface 940, and the memory 920 communicate with each other via the communication bus 930. The processor 910 may call a computer program in the memory 920 to execute a method for controlling a laser light source for cleaning cultural relics, which may include:

[0105] A preliminary laser of a fixed wavelength is obtained; characteristic information of the surface of the cultural relic to be cleaned is obtained, and operating parameters of the laser are determined based on the characteristic information; the preliminary laser is subjected to frequency conversion and energy regulation based on the operating parameters to obtain multiple intermediate lasers; the multiple intermediate lasers are subjected to temporal and spatial control based on the operating parameters to obtain multiple target lasers; wherein the time and / or space at which at least two of the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0106] Furthermore, the logic instructions in the aforementioned memory 920 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0107] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the laser light source for cleaning cultural relics provided by the above methods. The steps and principles have been introduced in detail in the above methods and will not be repeated here.

[0108] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the control method of the laser light source for cleaning cultural relics provided by the above methods. The steps and principles have been introduced in detail in the above methods and will not be repeated here.

[0109] The non-transitory computer-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NANDFLASH), solid-state drives (SSDs)), etc.

[0110] The above-mentioned method, device and electronic product for controlling a laser light source for cleaning cultural relics provided by the present invention include: obtaining a preliminary laser of a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining the operating parameters of the laser based on the characteristic information; frequency conversion and energy adjustment of the preliminary laser based on the operating parameters to obtain multiple intermediate lasers; time-space control of the multiple intermediate lasers based on the operating parameters to obtain multiple target lasers; wherein the time and / or space at which at least two of the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements. Through the above-mentioned method, the present invention can realize the composite control of the output laser parameters, and can adjust the time domain, space domain and frequency domain characteristics of the laser light field that interacts with the material according to the characteristics of different types of cultural relics to be cleaned, thereby realizing efficient cleaning of different types of cultural relics.

[0111] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0112] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for controlling a laser light source for cleaning cultural relics, characterized in that: include: Obtaining preliminary laser light of fixed wavelength; Acquiring characteristic information of the surface of the cultural relic to be cleaned, and determining the operating parameters of the laser according to the characteristic information; Performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers; The multiple intermediate lasers are temporally and spatially controlled according to the working parameters to obtain multiple target lasers; wherein the time and / or space when at least two target lasers among the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

2. The method for controlling a laser light source for cleaning cultural relics according to claim 1, wherein: After performing spatiotemporal control on the multiple intermediate lasers according to the operating parameters to obtain multiple target lasers, the method further includes: Using the multiple target lasers to perform laser cleaning on the surface of the cultural relic to be cleaned, and monitoring the laser energy status of the surface of the cultural relic to be cleaned at the current working moment; Adjusting the operating parameters of the laser according to the laser energy conditions; The target laser at the next working moment is obtained according to the adjusted working parameters.

3. The method for controlling a laser light source for cleaning cultural relics according to claim 1, wherein: The step of performing frequency conversion and energy adjustment on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers includes: After the frequency of the preliminary laser is converted according to the working parameters, a plurality of intermediate lasers are obtained, and the laser energy of each intermediate laser is adjusted; wherein the laser energy of at least two intermediate lasers is different.

4. The method for controlling a laser light source for cleaning cultural relics according to claim 1, wherein: The performing spatiotemporal control on the multiple intermediate lasers according to the operating parameters to obtain multiple target lasers includes: Time-regulating the plurality of intermediate lasers according to the operating parameters so that the time for the plurality of intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets a preset time requirement; The multiple intermediate lasers are spatially regulated according to the working parameters so that the beam spaces of at least two intermediate lasers transmitted to the surface of the cultural relic to be cleaned meet preset spatial requirements.

5. The method for controlling a laser light source for cleaning cultural relics according to any one of claims 1 to 4, characterized in that: The plurality of intermediate lasers include a first intermediate beam, a second intermediate beam, and a third intermediate beam; The wavelengths of the first intermediate light beam, the second intermediate light beam, and the third intermediate light beam are different; the time for the first intermediate light beam, the second intermediate light beam, and the third intermediate light beam to be transmitted to the surface of the cultural relic to be cleaned is the same; and the first intermediate light beam, the second intermediate light beam, and the third intermediate light beam are coaxially transmitted during the process of being transmitted to the surface of the cultural relic to be cleaned.

6. The method for controlling a laser light source for cleaning cultural relics according to claim 2, characterized in that: The monitoring of the laser energy condition of the surface of the cultural relic to be cleaned at the current working moment and adjusting the working parameters of the laser according to the laser energy condition includes: Determine the temporal and spatial intensity distribution of the laser beam according to the spot size and intensity distribution on the surface of the cultural relic to be cleaned; Comparing the temporal and spatial intensity distribution with an expected temporal and spatial intensity distribution determined according to the operating parameters to obtain an optimization factor; The operating parameters of the laser are adjusted according to the optimization factor.

7. A control device for a laser light source for cleaning cultural relics, characterized in that: include: A laser generating unit, used for obtaining a preliminary laser with a fixed wavelength; A working parameter determination unit, configured to obtain characteristic information of the surface of the cultural relic to be cleaned and determine the working parameters of the laser according to the characteristic information; A frequency conversion and energy control unit, configured to perform frequency conversion and energy adjustment on the preliminary laser according to the operating parameters to obtain a plurality of intermediate lasers; The beam time and space control unit is used to perform time and space control on the multiple intermediate lasers according to the working parameters to obtain multiple target lasers; wherein the time and / or space when at least two target lasers among the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the method for controlling the laser light source for cleaning cultural relics as described in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for controlling a laser light source for cleaning cultural relics as claimed in any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for controlling a laser light source for cleaning cultural relics as claimed in any one of claims 1 to 6 is implemented.

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