Regulation and control method and device of laser light source for cleaning cultural relics and electronic product

Abstract

The invention relates to the technical field of laser cleaning, and provides a regulation and control method and device of a laser light source for cultural relic cleaning and an electronic product. Acquiring feature information of the surface of the to-be-cleaned cultural relic, and determining working parameters of laser according to the feature information; performing frequency conversion and energy adjustment on the initial laser according to the working parameters to obtain a plurality of intermediate lasers; performing space-time regulation and control on the plurality of intermediate lasers according to the working parameters to obtain a plurality of target lasers; the time and / or space for at least two target lasers in the multiple target lasers to reach the surface of the to-be-cleaned cultural relic meet the preset requirement. By means of the mode, compound control over output laser parameters can be achieved, the time domain, space domain and frequency domain characteristics of the laser light field interacting with materials can be adjusted in a targeted mode according to the characteristics of different types of to-be-cleaned cultural relics, and efficient cleaning of the different types of cultural relics is achieved.

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. The above traditional methods of cleaning cultural relics will more or less cause irreversible damage to the cultural relics during the cleaning process. There are also inevitable disadvantages such as the instability of manual skills and pollution to the environment. In addition, it is impossible to achieve automation and fine cleaning, and the cleaning efficiency is low. With the development of laser technology and its wide 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, controllability, high stability, and fine cleaning, which provides the possibility of achieving non-destructive and harmless cleaning of pollutants on the surface of cultural relics.

[0003] Laser cleaning technology is a new type of cleaning technology based on the interaction between laser and matter, which has the advantages of selectivity, controllability, high stability, strong adaptability, and fine cleaning. The principle of laser cleaning of cultural relics is that the laser focuses the laser beam into a very small area through a focusing lens combination to form a high-energy laser beam, which destroys the interaction between the pollutant and the cultural relic substrate, and removes the pollutant from the surface of the object through processes such as light stripping, gasification, and ultrasound without damaging the substrate, thereby achieving the purpose of cleaning.

[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 physicochemical properties. Summary of the invention

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

[0006] The present invention provides a control method for a laser light source for cleaning cultural relics, comprising: obtaining a primary laser with a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining the working parameters of the laser according to the characteristic information; performing frequency conversion and energy regulation on the primary laser according to the working parameters to obtain a plurality of intermediate lasers; performing temporal and spatial control on the plurality of intermediate lasers according to the working 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 a control method of a laser light source for cleaning cultural relics provided by the present invention, after a plurality of target lasers are obtained by temporally and spatially controlling a plurality of intermediate lasers according to working parameters, the method further comprises: using the plurality of target lasers to perform laser cleaning on the surface of the cultural relics to be cleaned, and monitoring the laser energy conditions of the surface of the cultural relics to be cleaned at the current working moment; adjusting the working parameters of the laser according to the laser energy conditions; and obtaining the target laser at the next working moment according to the adjusted working parameters.

[0008] According to a control method of a laser light source for cleaning cultural relics provided by the present invention, a preliminary laser is subjected to frequency conversion and energy adjustment according to working parameters to obtain multiple intermediate lasers, including: after the preliminary laser is subjected to frequency conversion according to the working 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 a control method of a laser light source for cleaning cultural relics provided by the present invention, multiple intermediate lasers are temporally and spatially controlled according to working parameters to obtain multiple target lasers, including: temporally controlling the multiple intermediate lasers according to the working parameters so that the time when the multiple intermediate lasers are transmitted to the surface of the cultural relic to be cleaned meets the preset time requirement; spatially controlling the multiple intermediate lasers according to the working 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 the preset space requirement.

[0010] According to a control method of a laser light source for cleaning cultural relics provided by the present invention, multiple intermediate lasers include a first intermediate light beam, a second intermediate light beam and a third intermediate light 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; 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.

[0011] According to a control method of a laser light source for cleaning cultural relics provided by the present invention, the laser energy condition on the surface of the cultural relic to be cleaned at the current working moment is monitored, and the working parameters of the laser are adjusted according to the laser energy condition, including: determining 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 the expected temporal and spatial intensity distribution determined according to the working parameters to obtain an optimization factor; and adjusting the working 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, used to obtain a preliminary laser with a fixed wavelength; a working parameter determining unit, 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; a frequency conversion and energy control unit, used to perform frequency conversion and energy regulation on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers; a beam time and space control unit, used to perform time and space regulation on the plurality of intermediate lasers according to the working 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.

[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, wherein when the processor executes the program, a control method of a laser light source for cleaning cultural relics as described in any one of the 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, including a computer program, which, when executed by a processor, implements any of the above-mentioned methods for controlling a laser light source for cleaning cultural relics.

[0016] The present invention provides a control method, device and electronic product for a laser light source for cleaning cultural relics, wherein the method includes: obtaining a preliminary laser with a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining the working 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 multiple intermediate lasers; 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 of at least two target lasers among the multiple target lasers reaching the surface of the cultural relic to be cleaned meet the preset requirements. Through the above manner, 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 interacting with the material according to the characteristics of different types of cultural relics to be cleaned, so as to realize 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, the following briefly introduces 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 creative work.

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

[0019] Figure 2 It 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 It is a schematic diagram of light beam frequency conversion provided by an embodiment of the present invention.

[0021] Figure 4 It is a schematic diagram of an energy control subunit provided in an embodiment of the present invention.

[0022] Figure 5 It 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 the composite laser provided by an embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of a monitoring and feedback control unit provided in an embodiment of the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of a control device for a laser light source for cleaning cultural relics provided in an embodiment of the present invention.

[0026] Fig. 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] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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" and the like indicate positions or positional relationships based on the positions or positional relationships 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot 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 clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

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

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the 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. In related technologies, laser cleaning technology may also have the following problems: 1. The light source of cultural relics laser cleaning devices is mostly a single-wavelength nanosecond laser source, which has weak scalability for cleaning cultural relics of different materials and physical and chemical properties.

[0033] 2. For cultural relics of different colors, different laser wavelengths need to be changed according to the different laser absorption rates to achieve efficient laser cleaning. For example, stone cultural relics generally use 1064nm Nd:YAG nanosecond lasers, while painted and oil-painted cultural relics often use 355nm Nd:YAG nanosecond lasers. There are also plans to use erbium-doped 2.9μm lasers to clean cultural relics.

[0034] 3. For cultural relics of different materials, in addition to using a single wavelength for laser cleaning, a composite form of multiple wavelengths is also required to achieve non-destructive cleaning of the target. For example, after using 1064nm nanosecond laser to clean stone cultural relics, a yellowing effect occurs, while the use of a composite laser of 1064nm and 355nm can reduce the occurrence of the discoloration effect. Therefore, the cleaning process requires the composite of multiple wavelengths and the control of the output of multiple wavelength lasers, which is usually not available in current cleaning machines.

[0035] 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 view of the problem that the light source used in the above laser cleaning devices for cultural relics is not suitable for cleaning various types of cultural relics, the present invention provides a control method for a laser light source for cleaning cultural relics, which can obtain a composite parameter-controlled ultrashort laser light source for cleaning cultural relics, and can finely control the output laser parameters from multiple dimensions such as output wavelength, time domain intensity distribution, and space domain intensity distribution, so as to achieve a single laser cleaning device for cleaning various types of cultural relics, while minimizing the adverse effects of the cleaning process, and providing a basis for the application of laser cleaning technology and devices in the field of cultural relics protection.

[0036] See also Figure 1 , Figure 1 1 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: S110: Obtaining preliminary laser light with a fixed wavelength.

[0037] 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.

[0038] S130: frequency conversion and energy adjustment of the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers.

[0039] S140: performing time-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.

[0040] Among them, the preliminary laser can be a nanosecond pulse laser light source, or an ultrashort laser light source such as picosecond and femtosecond. In this embodiment, the output laser parameters that interact with the cultural relic material can be adjusted in a targeted manner according to the characteristics of different cultural relics to be cleaned, including the output laser wavelength, energy / power, spot size, and the time and space intensity distribution of the laser light field, so as to achieve efficient cleaning of different types of cultural relics. The core of this light source is the time and space intensity distribution form of the composite wavelength laser beam used for cultural relic cleaning and its control means, so as to realize the controllable laser beam output of a single laser cleaning light source under different cleaning requirements.

[0041] The composite parameter-controlled temporal and spatial intensity distribution of the output beam of the ultrashort laser light source not only includes the adjustable laser energy and beam size of conventional lasers, but also can realize the composite control and output of multiple parameters to achieve optimized cleaning of materials of different materials. For example, in terms of laser wavelength, it can not only output the fundamental frequency 1064nm laser and the frequency-doubled lasers such as 532nm and 355nm separately, but also can 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 time sequence and interval of lasers of different wavelengths when acting on 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 lasers of different wavelengths on the surface to be cleaned can be adjusted separately as needed.

[0042] 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 when the first intermediate beam, the second intermediate beam and the third intermediate beam are 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.

[0043] 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 according to the actual application requirements. The coaxial transmission and simultaneous arrival of three beams of light configuration is a special case of spatiotemporal control, while in other embodiments, the spatial configuration and arrival time of the three beams of light are adjustable. Those skilled in the art can adjust and set the spatial position and time sequence of the three beams of light accordingly according to the specific application scenarios and requirements.

[0044] 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: Laser cleaning is performed on the surface of the cultural relic to be cleaned using multiple target lasers, and the laser energy status of the surface of the cultural relic to be cleaned at the current working moment is monitored; the working parameters of the laser are adjusted according to the laser energy status; and the target laser at the next working moment is obtained according to the adjusted working parameters.

[0045] See also Figure 2 , Figure 2 The composite parameter controlled ultrashort laser source provided by the embodiment of the present invention is a block diagram of the composition of the composite parameter controlled ultrashort laser source. The composite parameter controlled ultrashort laser source is composed of a fundamental frequency ultrashort laser source, a frequency conversion unit and an energy control unit, a beam time and space control unit, a monitoring and feedback control unit, etc.

[0046] Based on this, the 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.

[0047] (1) Fundamental frequency ultrashort laser source The function of the fundamental frequency ultrashort laser is to output an ultrashort laser with a fixed wavelength for laser cleaning. The fundamental frequency ultrashort laser can be a Nd:YAG solid-state laser used for laser cleaning, which outputs a fundamental frequency laser with a wavelength of 1064nm. The fundamental frequency ultrashort laser can also be a Yb-doped fiber laser with an output fundamental frequency wavelength of 1030nm. The fundamental frequency ultrashort laser can also be a thulium-doped / erbium-doped medium-wave infrared laser.

[0048] 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.

[0049] (2) Frequency conversion unit and energy control unit The frequency conversion and energy control unit, on the one hand, converts the fundamental frequency laser output by the fundamental frequency laser into lasers of other wavelengths through frequency conversion technology, so as to expand the available wavelength of the light source; on the other hand, it realizes independent control of the energy of output lasers of different wavelengths through the frequency change process and the addition of energy regulation components.

[0050] 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 a plurality of intermediate lasers may specifically include: 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.

[0051] The frequency conversion unit and the energy control unit can be divided into a frequency conversion subunit and an energy control subunit. The frequency conversion subunit can use nonlinear crystals (such as KDP, LBO, etc.) to achieve frequency doubling output of the fundamental frequency light, such as outputting 532nm laser after frequency doubling of 1064nm, and then outputting 355nm laser after frequency summing of 1064nm and 532nm light. At this time, after frequency conversion, the laser light source can output 1064nm, 532nm and 355nm laser beams separately, or output the above three wavelength lasers in a composite form as needed.

[0052] See also Figure 3 , Figure 3 It is a schematic diagram of light beam frequency conversion provided by an embodiment of the present invention.

[0053] The fundamental frequency ultrashort laser generates preliminary laser, and through the cooperation of 1064 beam splitters, 532 beam splitters, 355 total reflection mirrors, frequency doubling units and sum frequency units, a three-wavelength laser composite form can be obtained.

[0054] 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.

[0055] The 532 beam splitter can split a 532-nanometer 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.

[0056] The 355 total reflection mirror can emit a beam of 355-nanometer laser obtained after being processed 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.

[0057] In other embodiments, the frequency conversion subunit may also be other nonlinear change forms, such as optical parametric oscillator (OPO), which can convert the fundamental frequency light into coherent laser outputs of other two frequencies according to the frequency change condition.

[0058] The energy control subunit includes two levels. The first is to control the strength of the nonlinear frequency change process to achieve the energy control of different extended wavelength lasers. 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, and the energy of the 355nm laser can be controlled by controlling the sum frequency conversion efficiency.

[0059] In addition, the energy control subunit can also be realized by using electronic devices. Figure 4 , Figure 4 It is a schematic diagram of an energy control subunit provided in an embodiment of the present invention.

[0060] After the three-wavelength output laser generates three-wavelength lasers, attenuation combiners such as neutral density attenuation plates, and / or half-wave plates and polarizers can be added to the output ends of the three-wavelength lasers to achieve independent regulation and control of the output energy of each wavelength.

[0061] (3) Beam time and space control unit The function of the beam time and space control unit is to control the intensity and distribution of the laser beam acting on the cultural relic sample in the dimensions of time and space. Taking the composite laser beam that can output three wavelengths of 1064nm, 532nm and 355nm as an example, the time level control includes the time sequence and time interval of the three wavelengths of the composite laser beam in the timing of acting on the material surface; the space level control includes the control of the three wavelengths of the composite laser beam irradiated on the center position of the material surface and the size of the beam, which together with the aforementioned energy regulation determines the intensity of the beam acting on the material.

[0062] Based on any of the above embodiments, the step of performing spatiotemporal control on the multiple intermediate lasers according to the working parameters to obtain the multiple target lasers may specifically include: The multiple intermediate lasers are time-controlled according to the working parameters so that the time for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets the preset time requirement; the multiple intermediate lasers are spatially controlled according to the working 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 the preset space requirement.

[0063] 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 order 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.

[0064] Here, the increase or decrease of time delay can be achieved by increasing or decreasing the three-wavelength transmission optical paths (adding auxiliary optical paths, increasing or decreasing the corresponding wavelength time delay lines), or by adding high-dispersion media of different thicknesses and utilizing the difference in transmission time of different wavelengths. A combination of the two methods can also be used to achieve large-scale coarse adjustment and fine-scale fine adjustment.

[0065] See also Figure 5 , Figure 5 It is a schematic diagram of composite laser time control provided by an embodiment of the present invention.

[0066] 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 increased by adding an auxiliary optical path; Figure 5 (b) shows that after the three-wavelength output laser generates three-wavelength laser, the time sequence and interval of the three-wavelength laser acting on the material surface are controlled by adding a high-dispersion medium.

[0067] 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 the composite laser provided by an embodiment of the present invention.

[0068] The adjustment of the spatial center position of the three wavelength beams can be achieved by the combination of dichroic mirrors. For example, the spatial combination of the three wavelength lasers of 1064nm, 532nm and 355nm can be achieved by using a 1064nm total reflection mirror, a 1064nm anti-reflection and a 532nm total reflection mirror, or a 1064nm532nm anti-reflection 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. The spatial positions of the three beam centers on the sample surface can also be adjusted as needed to form other forms of spatially distributed composite lasers.

[0069] exist Figure 6 As shown in (b), the beam size of the three wavelength light beams irradiated on the material surface can be adjusted by adding beam expansion and contraction lenses of respective bands at the output ends of the three wavelength light beams to control the spatial size of each wavelength light beam acting on the material surface.

[0070] (4) Monitoring and feedback control unit The monitoring and feedback control unit measures the time and space intensity distribution of the laser beam on the surface of the sample to be cleaned, and provides it to the aforementioned energy control and time and space regulation unit for correction and adjustment. This unit mainly consists of laser energy monitoring, beam time and space distribution measurement and feedback control system irradiated on the sample surface.

[0071] Based on any of the above embodiments, the step of monitoring the laser energy condition of the surface of the cultural relic to be cleaned at the current working moment and adjusting the laser working parameters according to the laser energy condition may specifically include: The temporal and spatial intensity distribution of the laser beam is determined according to 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 according to the working parameters to obtain the optimization factor; and the working parameters of the laser are adjusted according to the optimization factor.

[0072] See also Figure 7 , Figure 7 It is a schematic diagram of a monitoring and feedback control unit provided in an embodiment of the present invention.

[0073] Among them, the laser energy monitoring, the time and spatial distribution measurement of the beam irradiated on the sample surface are respectively completed by the sampling mirror in conjunction with the laser energy meter, the photoelectric probe, the beam analyzer, etc. Specifically, the sampling mirror 1 can be respectively provided to collect data corresponding to the laser energy meter, the sampling mirror 2 can be respectively provided to collect data in conjunction with the photoelectric probe, and the sampling mirror 3 can be respectively provided to collect data in conjunction with the beam analyzer.

[0074] It should be noted that the optical path of the beam analyzer 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 analyzer are consistent with the spot irradiated on the sample surface.

[0075] The beam energy, time, and spatial distribution information obtained by the above monitoring units are processed by an 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 regulation 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.

[0076] 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 that interacts with the material according to the characteristics of different types of cultural relics to be cleaned, so as to achieve efficient cleaning of different types of cultural relics.

[0077] 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.

[0078] 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.

[0079] See also Figure 8 , Figure 8 8 is a schematic diagram of the structure of the control device of the laser light source for cleaning cultural relics provided by an embodiment of the present invention. The control device of the laser light source for cleaning cultural relics may include a laser generating unit 810, a working parameter determining unit 820, a frequency conversion and energy control unit 830 and a beam time and space control unit 840.

[0080] The laser generating unit 810 is used to obtain preliminary laser with a fixed wavelength.

[0081] 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.

[0082] 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.

[0083] 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 among the multiple target lasers reach the surface of the cultural relic to be cleaned meets preset requirements.

[0084] 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 on 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.

[0085] Based on any of the above embodiments, the frequency conversion and energy control unit 830 may be specifically used for: 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.

[0086] Based on any of the above embodiments, the light beam time and space control unit 840 can be specifically used for: The multiple intermediate lasers are time-controlled according to the working parameters so that the time for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets the preset time requirement; the multiple intermediate lasers are spatially controlled according to the working 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 the preset space requirement.

[0087] 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 when the first intermediate beam, the second intermediate beam and the third intermediate beam are 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.

[0088] Based on any of the above embodiments, the monitoring and feedback control unit may also be used for: The temporal and spatial intensity distribution of the laser beam is determined according to 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 according to the working parameters to obtain the optimization factor; and the working parameters of the laser are adjusted according to the optimization factor.

[0089] On the other hand, an embodiment of the present invention further provides an electronic device, see Fig. 9 , Fig. 9 is a schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention, such as Fig. 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.

[0090] 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 through 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, and the method may include: Obtain a preliminary laser with a fixed wavelength; 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; perform frequency conversion and energy regulation on the preliminary laser according to the working parameters to obtain a plurality of intermediate lasers; perform time and space control on the plurality of intermediate lasers according to the working 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.

[0091] In addition, the logic instructions in the above-mentioned memory 920 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0092] 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.

[0093] 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-mentioned methods. The steps and principles thereof have been introduced in detail in the above-mentioned methods and will not be repeated here.

[0094] Non-transitory computer-readable storage media can be any available media or data storage devices 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)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NANDFLASH), solid-state drives (SSDs)), etc.

[0095] As mentioned above, the present invention provides a control method, device and electronic product for a laser light source for cleaning cultural relics, wherein the method includes: obtaining a preliminary laser of a fixed wavelength; obtaining characteristic information of the surface of the cultural relic to be cleaned, and determining the working 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 multiple intermediate lasers; 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 of at least two target lasers among the multiple target lasers reaching the surface of the cultural relic to be cleaned meet the preset requirements. Through the above manner, 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 interacting with the material in a targeted manner according to the characteristics of different types of cultural relics to be cleaned, so as to realize efficient cleaning of different types of cultural relics.

[0096] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0097] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0098] 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 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; 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; 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, characterized in that: After performing time-space control on the multiple intermediate lasers according to the working 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 working 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, characterized in that: 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 comprises: 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, characterized in that: The step of performing temporal and spatial control on the plurality of intermediate lasers according to the working parameters to obtain a plurality of target lasers includes: According to the working parameters, the multiple intermediate lasers are time-controlled so that the time for the multiple intermediate lasers to be transmitted to the surface of the cultural relic to be cleaned meets the preset time requirement; The plurality of intermediate lasers are spatially regulated according to the working 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 the preset space requirement.

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 from each other; the time when the first intermediate light beam, the second intermediate light beam and the third intermediate light beam are transmitted to the surface of the cultural relic to be cleaned is the same; 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 include: 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 the expected temporal and spatial intensity distribution determined according to the working 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, 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; A frequency conversion and energy control unit, used for performing frequency conversion and energy adjustment on the preliminary laser according to the working 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 the 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 claimed 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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