An ultraviolet pulsed laser device for killing viruses and bacteria

Abstract

The present invention is applicable to the technical field of virus and bacteria killing, and provides an ultraviolet pulsed laser device for virus and bacteria killing, which includes a pulsed laser module, a power supply module and a laser cavity. The power supply module is electrically connected to the pulsed laser module, the laser cavity is connected to the pulsed laser module through a laser conduction device, and the laser cavity is connected with a laser spot control module for controlling the size of the laser spot and / or controlling the irradiation path of the laser spot. The ultraviolet pulsed laser device for virus and bacteria killing provided by the present invention can vaporize viruses, decompose the viruses into carbon, water and carbon dioxide, has good virus killing effect, does not damage or contaminate objects, has a greatly improved killing efficiency, and has the advantages of high killing efficiency, no pollution, convenient to carry, long service life, low damage to target items, no consumables, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of virus and bacteria killing, and particularly relates to an ultraviolet pulsed laser device for virus and bacteria killing. Background Art

[0002] Currently, the most similar solutions for virus disinfection are: ultraviolet lamp disinfection, laser disinfection, or continuous ultraviolet laser disinfection. The current ultraviolet lamp disinfection used in the market takes a relatively long time, more than 30 minutes. There are few products for ultraviolet laser disinfection. Even if there are products, they are continuous output ultraviolet lasers with milliwatt or microwatt power, and the virus killing effect is not good. Summary of the Invention

[0003] The present invention aims to solve at least one of the above technical problems, and provides an ultraviolet pulsed laser device for virus and bacteria killing, which has ultra-high killing efficiency, is environmentally friendly, convenient to carry, and convenient to be combined with various devices for use.

[0004] The technical solution of the present invention is: an ultraviolet pulsed laser device for virus and bacteria killing, including a pulsed laser module, a power supply module, and a laser cavity. The power supply module is electrically connected to the pulsed laser module. The laser cavity is connected to the pulsed laser module through a laser conduction device. The laser cavity is connected with a laser spot control module for controlling the size of the laser spot and / or controlling the irradiation path of the laser spot.

[0005] Optionally, the laser spot control module includes a spot size control component. The spot size control component includes a first lens and a second lens. The first lens and the second lens are arranged at intervals front and back. The spot size control component further includes a distance adjustment component for adjusting the distance between the first lens and the second lens.

[0006] Optionally, the distance adjustment component includes a lens fixing cylinder and a distance adjustment cylinder. The distance adjustment cylinder slides or is threadedly sleeved on the lens fixing cylinder. The first lens is connected to the lens fixing cylinder, and the second lens is connected to the distance adjustment cylinder.

[0007] Optionally, the laser spot control module includes a spot irradiation path control component. The spot irradiation path control component includes at least one group of reflecting lenses, and at least one group of the reflecting lenses is connected with a rotation control component for controlling the flipping of the reflecting lenses.

[0008] Optionally, there are two groups of reflecting lenses. Each group of reflecting lenses is connected with the rotation control component. The control component includes a motor and a control board. The reflecting lens is connected to the motor, and the control board is connected to the motor.

[0009] Optionally, the laser spot control module includes a spot size control component, which includes a first lens and a second lens. The first lens and the second lens are arranged at intervals in the front and rear. The spot size control component further includes a distance adjustment component for adjusting the distance between the first lens and the second lens;

[0010] The laser spot control module includes a spot irradiation path control component, which includes at least one set of reflecting lenses, and at least one set of the reflecting lenses is connected with a rotation control component for controlling the flipping of the reflecting lenses;

[0011] The input end of the spot size control component is connected to the laser cavity, and the spot irradiation path control component is connected to the output end of the spot size control component.

[0012] Optionally, the laser cavity is a handheld cavity, and the laser cavity is provided with control buttons. The laser conduction device is an optical fiber. The ultraviolet pulsed laser device further includes a box body. The pulsed laser module and the power supply module are arranged in the box body. The box body is provided with a pull rod structure or a shoulder strap structure or traveling wheels. The laser spot control module is connected to the front end of the handheld cavity.

[0013] Optionally, the ultraviolet pulsed laser device includes a gun-shaped or straight-tube-shaped housing. The pulsed laser module, the power supply module, and the laser cavity are all built in the housing. The laser spot control module is connected to the front end of the housing.

[0014] Optionally, the ultraviolet pulsed laser device further includes a robot body. The bottom of the robot body is provided with crawlers or wheels. The pulsed laser module and the power supply module are connected to the robot body. The laser cavity is connected to the robot body through a pan-tilt.

[0015] Optionally, the robot body is built with an Internet of Things control card.

[0016] The ultraviolet pulsed laser device provided by the present invention for killing viruses and bacteria can vaporize viruses, decompose viruses into carbon, water, and carbon dioxide, has a good virus killing effect, does not damage or contaminate objects, has a greatly improved killing efficiency, and has the advantages of high killing efficiency, no pollution, convenient carrying, long service life, low damage to target items, and no consumables. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic plan view of a spot size control component in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0020] Figure 3 is a schematic plan view of a spot irradiation path control component in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0021] Figure 4 is a schematic plan view of the combined use of a spot size control component and a spot irradiation path control component in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0022] Figure 5 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention when the laser cavity is a handheld cavity and the main body is a box;

[0023] Figure 6 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention when the laser cavity is a handheld cavity and the main body is a box (equipped with an adjustable shoulder strap);

[0024] Figure 7 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention when the laser cavity is a handheld cavity and the main body is a box (with a pull rod and wheels);

[0025] Figure 8 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention when the housing is gun-shaped;

[0026] Figure 9 is a schematic plan view of an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention when the housing is straight cylindrical;

[0027] Figure 10It is a schematic plan view when in the shape of a robot in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0028] Figure 11 It is a schematic plan view when in the shape of a fixed box in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention;

[0029] Figure 12 It is a schematic plan view of a spot size control component and a rotation control component in an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention. Detailed implementation manners

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a direct arrangement, installation, connection, or can also be indirectly arranged and connected through intermediate components and intermediate structures.

[0032] In addition, in the embodiments of the present invention, if there are orientations or positional relationships indicated by "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., they are based on the orientations or positional relationships shown in the drawings or the conventional placement states or usage states, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structures, features, devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0033] In the various specific technical features and each embodiment described in the detailed implementation manners, they can be combined in any suitable manner without conflict. For example, different embodiments can be formed by combining different specific technical features / embodiments. To avoid unnecessary repetition, various possible combination methods of the various specific technical features / embodiments in the present invention will not be described separately.

[0034] Such as Figure 1 and Figure 2As shown in the figure, an ultraviolet pulsed laser device for virus and bacteria killing provided by an embodiment of the present invention includes a power supply module 1, a pulsed laser module 2, and a laser cavity 5. The power supply module 1 is electrically connected to the pulsed laser module 2. The laser cavity 5 can be connected to the pulsed laser module 2 through a laser conduction device 3. Of course, the laser cavity 5 and the pulsed laser module 2 can also be directly connected or oppositely arranged (the pulsed ultraviolet light generated by the pulsed laser module 2 can directly irradiate the laser cavity 5). The laser cavity 5 is connected with a laser spot control module 7 for controlling the size of the laser spot and / or controlling the irradiation path of the laser spot. The power supply module 1 can be powered by a storage battery or a 110 - 220V AC power supply, and it can be independent or integrated into the pulsed laser module 2. The pulsed laser module 2 can be a laser pump source of various bands. There is a laser crystal inside the laser cavity 5, and changing the crystal type can change the laser output band. The laser cavity 5 can be equipped with a switch. The inner wall of the laser cavity 5 can be aluminum, the outer wall can be plastic, and the handheld part can be plastic. The pulsed laser module (pulsed laser) 2 works only once every certain period of time. The emitted pulse is stored in energy and the stored energy is emitted in a short time, so the power is very high. Compared with a continuous laser, the pulsed laser outputs more photons within the pulse time. The shorter the pulse time, the higher the laser peak. Especially when the pulse width time is compressed to femtoseconds, picoseconds, and nanoseconds, a large number of photons (light beam 8) are instantaneously output by the laser, which can vaporize the virus, decompose the virus into carbon, water, and carbon dioxide, with good virus killing effect and without damaging or polluting the object.

[0035] In specific applications, the pulsed laser module 2 can emit ultraviolet light with a wavelength of 0.1 - 400 nm. Preferably, the wavelength of the ultraviolet light output by the pulsed laser is 155 to 356 nm, such as 355 nm, and its power can be set relatively high. The duration of a single pulse (pulse width) output by the pulsed laser is: t (actually the FWHM width), the energy of a single pulse is: E, and the pulse repetition period of the output laser is: T. Then, the average power Pav of the laser pulse = E / T (i.e., the energy output per unit time within a repetition period), and the peak power (peak power) Ppk of the pulsed laser = E / t, where E = hv, h is Planck's constant, and v is the frequency of light. The value of Planck's constant is approximately: h = 6.6260693(11)×10^(-34) J•s, with the unit being joule (J) • second (s). From this, it can be concluded that the shorter the wavelength of light, the higher its energy. The shorter the wavelength used, the higher the absorption rate of the substance. Coronaviruses are classified in the genus Coronavirus of the family Coronaviridae. Viruses of the genus Coronavirus are positive-sense single-stranded RNA viruses with an envelope, about 80 - 120 nm in diameter. Their genetic material is the largest among all RNA viruses, and they infect vertebrates such as humans, mice, pigs, cats, dogs, wolves, chickens, cows, and birds. A variant of the coronavirus is the pathogen that causes severe acute respiratory syndrome (SARS), belonging to the RNA virus. Coronaviruses were first isolated from chickens in 1937. The diameter of the virus particles is 60 - 200 nm, with an average diameter of 100 nm, and they are spherical or oval-shaped, showing polymorphism. The virus has an envelope with spikes on it, and the whole virus resembles a corona. The spikes of different coronaviruses are significantly different. Sometimes, tubular inclusion bodies can be seen in coronavirus-infected cells. The novel coronavirus 2019 (2019-nCoV) is currently the 7th known coronavirus that can infect humans. The other 6 are HCoV-229E, HCoV-OC43, HCoV-NL63, HCoV-HKU1, SARS-CoV, and MERS-CoV. The research team led by Dong Xiaoping of the Chinese Center for Disease Control and Prevention has confirmed that UVC ultraviolet light with an intensity greater than 90 μW / cm² can kill coronaviruses after irradiating them for 30 minutes. The UVC ultraviolet light used for disinfection and killing uses ultraviolet light with a wavelength of 200 - 300 nm, targeting the viral RNA. If a nanosecond ultraviolet pulsed laser is used, it is 2123142 times that of a UVC ultraviolet lamp. 15 kW / 78.5 cm² / 90 μW / cm² = 2123142. The calculation of the killing time: 30 minutes * 60 seconds * 1000 milliseconds / 2123142 = 0.847 milliseconds.The parameters of the experimental pulsed ultraviolet laser are as follows: wavelength (nm) is 355 ± 1, average power (W): 1 W, pulse width (ns): 3 ns, peak power (kW): 15 kW, repetition frequency (kHz): 25 kHz, spot area (cm²): 78.5 cm², spot diameter (mm): 100 mm. It should be noted that the above parameters are only for illustrative purposes and are not limitations on this embodiment. In specific applications, those of ordinary skill in the art can flexibly select them.

[0036] Specifically, the laser cavity 5 can be connected to the power supply module 1 or the pulsed laser module 2 through the control line 4.

[0037] Specifically, as Figure 2 shown, the laser spot control module 7 includes a spot size control component. The spot size control component includes a first lens 711 and a second lens 712. The first lens 711 and the second lens 712 are arranged at intervals front and back. The spot size control component further includes a distance adjustment component for adjusting the distance between the first lens 711 and the second lens 712. The first lens 711 can be a double concave lens, the second lens 712 can be a plano-convex lens, and the first lens 711 and the second lens 712 can be coaxially arranged. By adjusting the distance between the first lens 711 and the second lens 712, the size of the laser spot can be controlled.

[0038] Specifically, as Figure 2 shown, the distance adjustment component includes a lens fixing cylinder 721 and a distance adjustment cylinder 722. The distance adjustment cylinder 722 slides or is threaded onto the lens fixing cylinder 721. The first lens 711 is connected to the lens fixing cylinder 721, and the second lens 712 is connected to the distance adjustment cylinder 722. The distance between the first lens 711 and the second lens 712 can be well adjusted by sliding or rotating. Of course, the distance adjustment component can also adjust the distance between the first lens 711 and the second lens 712 by means of a linear motor, a rack and pinion, etc.

[0039] Specifically, as Figure 3 、 Figure 4As shown, the laser spot control module 7 includes a spot irradiation path control component, which can be integrated into a cylinder with openings at both ends. The spot irradiation path control component includes at least one set of reflecting lenses 731, and at least one set of the reflecting lenses 731 is connected to a rotation control component for controlling the rotation of the reflecting lenses 731. By rotating the reflecting lenses 731, the laser can irradiate the surface of an object along a preset path, with a large killing range. In specific applications, the scanning path of the cyclic light beam is set. The angle of the reflecting lenses 731 can be controlled by a motor. The swing amplitude of the motor can be programmed in advance. After the signal is turned on, the two sets of lenses can swing continuously, enabling the high-energy light beam to automatically scan a large area. This further improves the killing energy and efficiency. When using this ultraviolet pulsed laser device to continuously irradiate proteins, hair, molds, and viruses, if the spot is not moved, a burnt protein smell will be emitted from the experimental object, and the effect is very significant.

[0040] In this embodiment, there are two sets of the reflecting lenses 731, and each set of the reflecting lenses 731 is connected to the rotation control component. The control component includes a motor 732 and a control board 733. The reflecting lenses 731 are connected to the motor 732, and the control board 733 is connected to the motor 732. The two reflecting lenses 731 can be arranged facing each other. In this embodiment, one of the reflecting lenses 731 is used to reflect the spot emitted from the spot size control component or the laser cavity to the other reflecting lens 731. One of the reflecting lenses 731 is closer to the spot size control component or the laser cavity than the other reflecting lens 731. The spot size control component or the laser cavity has a central axis. One of the reflecting lenses 731 is located on one side of the central axis, and the other reflecting lens 731 is located on the other side of the central axis.

[0041] In specific applications, the spot size control component and the spot irradiation path control component can be set selectively or simultaneously. In this embodiment, the spot size control component and the spot irradiation path control component are arranged in sequence along the laser emission direction: the laser spot control module 7 includes a spot size control component, which includes a first lens 711 and a second lens 712. The first lens 711 and the second lens 712 are arranged at intervals in the front and back. The spot size control component further includes a distance adjustment component for adjusting the distance between the first lens 711 and the second lens 712; the laser spot control module 7 includes a spot irradiation path control component, which includes at least one set of reflecting lenses 731, and at least one set of the reflecting lenses 731 is connected to a rotation control component for controlling the rotation of the reflecting lenses 731; the input end of the spot size control component is connected to the laser cavity 5, and the spot irradiation path control component is connected to the output end of the spot size control component.

[0042] Specifically, as Figure 12 shown, the laser spot control module may further include a rotation control component for circumferentially rotating and projecting the laser spot. The rotation control component is directly connected to the laser cavity 5 or may be connected to the spot size control component. The rotation control component includes a mirror 741 inclined relative to the incident light, and the mirror 741 is connected to a control motor 742 for driving the circumferential rotation of the mirror 741. The spot size control component and the rotation control component may be provided simultaneously or alternatively. As Figure 12 shown, when the spot size control component and the rotation control component are provided simultaneously, the effective disinfection area can reach dozens of square meters, hundreds of square meters or even thousands of square meters. The spot size control component and the rotation control component are arranged in sequence along the laser emission direction. The lenses (the first lens 711 and the second lens 712) of the spot size control component have a central axis, and this central axis passes through the center of the mirror 741. The mirror 741 can be rectangular or circular, that is, the rotation control component is located in front of the spot size control component. The included angle between the mirror 741 and the central axis can be between 30 and 60 degrees. Preferably, the included angle between the mirror 741 and the central axis can be between 40 and 50 degrees, such as 45 degrees. The axis of the rotating shaft of the control motor 742 is collinear with the central axis of the spot size control component. When the rotating shaft of the control motor 742 rotates one week, the spot will scan a circle circumferentially, and the virus killing range is large. The control motor 742 may be connected to a control circuit board for controlling the rotation direction, rotation speed and rotation angle of the rotating shaft. The control circuit board may also be used to control the reciprocating rotation of the rotating shaft within a set angle range. The control motor 742 can be fixedly connected to the laser cavity or other suitable positions through a bracket (not shown in the figure).

[0043] In specific applications, the ultraviolet pulsed laser device may also be provided with an infrared human body sensor. If there are people around, the infrared human body sensor can send out a sensing signal, which can control the laser module to pause working, or make the control motor drive the mirror to avoid the area where people are located, and the safety and reliability are good.

[0044] In specific applications, specifically, as Figure 5 shown, the ultraviolet pulsed laser device further includes a box body 9, and the pulsed laser module 2 and the power supply module 1 are arranged in the box body 9. The laser cavity 5 can be a handheld cavity and is connected to the pulsed laser module 2 in the box body 9 through a laser conduction device 3. The laser cavity 5 is provided with a control button 6, and the laser conduction device 3 is an optical fiber. The laser cavity 5 can be flexibly moved, and the box body with a relatively large volume is conducive to installing a battery with a larger capacity, a laser device with a higher power, etc.

[0045] In specific applications, as a possible implementation manner, the box body 9 is provided with a backpack structure (as Figure 6The adjustable strap (such as 92) or the pull rod structure (such as Figure 7 the pull rod shown as 93) or the walking wheels (such as Figure 7 the walking wheels shown as 94), and the laser spot control module 7 (the spot size control component and the spot irradiation path control component) is connected to the front end of the handheld cavity. Components such as a battery can be arranged in the box body 9. A fiber optic reel can also be arranged in the box body 9. A laser cavity hanging opening 91 can be arranged on the side or top of the box body 9. The box body can be a trolley case.

[0046] In specific applications, such as Figure 11 shown, as one possible implementation manner, the box body 9 can also be fixed and placed in an air conditioning duct or at a ceiling. When the box body 9 is arranged at the ceiling, a human body sensor can be arranged on the surface of the box body 9, and the human body sensor can be electrically connected to the power supply module 1. When a human body approaches, the ultraviolet pulsed laser device can be automatically turned off.

[0047] Alternatively, as a possible alternative, the ultraviolet pulsed laser device includes a gun-shaped (such as Figure 8 shown) or a straight tube-shaped (such as Figure 9 shown) housing, and the pulsed laser module 2, the power supply module 1 and the laser cavity 5 are all built in the housing, and the laser spot control module 7 is connected to the front end of the housing.

[0048] Alternatively, as a possible alternative, such as Figure 10 shown, the ultraviolet pulsed laser device further includes a robot body, and a crawler 96 or wheels are arranged at the bottom of the robot body. The pulsed laser module 2 and the power supply module 1 are connected to the robot body, and the laser cavity 5 is connected to the robot body through a pan-tilt 65. The pan-tilt 65 can rotate circumferentially and adjust the pitch angle. The robot body is built with an Internet of Things control card 97 and a motion control card 98, and can control the walking of the ultraviolet pulsed laser device, the rotation of the laser cavity 5, etc. through remote control and other means, and can be applicable to high-risk environments such as places where it is inconvenient for personnel to enter, effectively protecting the staff.

[0049] For the ultraviolet pulsed laser device for virus and bacteria killing provided by the embodiment of the present invention, during operation, the driving power supply is turned on, the laser is output through the conduction optical fiber, and the laser spot control module 7 is adjusted to aim at the virus disinfection area. It can vaporize the virus, decompose the virus into carbon, water and carbon dioxide, has a good virus killing effect, does not damage or pollute the object, and has a greatly improved killing efficiency. The original killing time was calculated in minutes, and now the killing time is calculated in milliseconds, and it has a high killing efficiency, no pollution, is convenient to carry, has a long service life, causes low damage to the target item, and has no consumables.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An ultraviolet pulsed laser device for killing viruses and bacteria, characterized in that, It includes a power supply module, a laser cavity, and a pulsed laser module for generating pulsed laser. The power supply module is electrically connected to the pulsed laser module. The laser cavity is connected with a laser spot control module for controlling the size of the laser spot and / or the irradiation path of the laser spot. The laser cavity is connected to the pulsed laser module through a laser conduction device, and the laser conduction device is an optical fiber. The pulsed laser module operates once every certain period of time, and the emitted pulse is emitted after energy storage. The pulsed laser module is a nanosecond ultraviolet pulsed laser. The spot size control component and the spot irradiation path control component are arranged in sequence along the laser emission direction. The laser spot control module includes a spot irradiation path control component, and the spot irradiation path control component can be integrated in a cylinder with openings at both ends. The spot irradiation path control component includes at least one set of reflecting lenses, and at least one set of the reflecting lenses is connected with a rotation control component for controlling the rotation of the reflecting lenses. By rotating the reflecting lenses, the laser is irradiated on the surface of the object according to a preset path, and the scanning path of the cyclic light beam is set. The angle of the reflecting lenses is controlled by a motor, and the swing amplitude of the motor is programmed in advance. After the signal is turned on, the two sets of lenses swing continuously. There are two sets of reflecting lenses, and each set of reflecting lenses is connected with the rotation control component. The reflecting lenses are connected to the motor, and the two reflecting lenses are arranged facing each other. One of the reflecting lenses is used to reflect the spot to the other reflecting lens. One of the reflecting lenses is closer to the laser cavity than the other reflecting lens. The laser cavity has a central axis. One of the reflecting lenses is located on one side of the central axis, and the other reflecting lens is located on the other side of the central axis. The wavelength of the ultraviolet light output by the pulsed laser is 155 to 356 nm. The laser spot control module includes a spot size control component. The spot size control component includes a first lens and a second lens. The first lens and the second lens are arranged at intervals front and back. The spot size control component also includes a distance adjustment component for adjusting the distance between the first lens and the second lens. The first lens is a biconcave lens, the second lens is a plano-convex lens, and the first lens and the second lens are coaxial. The distance adjustment component adjusts the distance between the first lens and the second lens through a linear motor. The laser spot control module further includes a rotation control component for projecting the laser spot to rotate circumferentially. The rotation control component is connected to the spot size control component. The rotation control component includes a reflecting mirror inclined relative to the incident light. The reflecting mirror is connected with a control motor for driving the reflecting mirror to rotate circumferentially. The first lens and the second lens have a central axis, and this central axis passes through the center of the reflecting mirror. The reflecting mirror is rectangular or circular. The rotation control component is located in front of the spot size control component. The included angle between the reflecting mirror and the central axis ranges from 40 to 50 degrees. The ultraviolet pulsed laser device is also provided with an infrared human body sensor. If there is someone around, the infrared human body sensor emits a sensing signal to control the laser module to pause working.

2. The ultraviolet pulsed laser device for virus and bacteria killing according to claim 1, characterized in that, The laser cavity is a handheld cavity, and the laser cavity is provided with control buttons. The ultraviolet pulsed laser device further includes a box body, the pulsed laser module and the power supply module are arranged in the box body, the box body is provided with a pull rod structure or a shoulder strap structure or traveling wheels, and the laser spot control module is connected to the front end of the handheld cavity.

3. The ultraviolet pulsed laser device for virus and bacteria killing according to claim 1, characterized in that, The ultraviolet pulsed laser device includes a shell in the shape of a gun or a straight tube, the pulsed laser module, the power supply module and the laser cavity are all built in the shell, and the laser spot control module is connected to the front end of the shell.

4. An ultraviolet pulsed laser device for virus and bacteria killing as described in claim 1, characterized in that, The ultraviolet pulsed laser device further includes a robot body, the bottom of the robot body is provided with crawlers or wheels, the pulsed laser module and the power supply module are connected to the robot body, and the laser cavity is connected to the robot body through a pan-tilt head.

5. The ultraviolet pulsed laser device for virus and bacteria killing according to claim 4, characterized in that The robot body is built with an Internet of Things control card.

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