CN113406794A - Laser optical path system with laser biological inactivation function - Google Patents

Laser optical path system with laser biological inactivation function Download PDF

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Publication number
CN113406794A
CN113406794A CN202110695725.7A CN202110695725A CN113406794A CN 113406794 A CN113406794 A CN 113406794A CN 202110695725 A CN202110695725 A CN 202110695725A CN 113406794 A CN113406794 A CN 113406794A
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China
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laser
reactor
optical path
path system
biological inactivation
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CN202110695725.7A
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Chinese (zh)
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范晓星
刘亚靖
陶然
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Liaoning University
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Liaoning University
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

The invention relates to a laser optical path system with a laser biological inactivation function, which utilizes the reflection effect of a reflector on laser to construct a reactor of a high-intensity laser field in a fixed space range; one end of the reactor is provided with a gas inlet, and the other end of the reactor is provided with a gas outlet; a laser window is arranged in the wall of the container of the reactor, and laser emitted by an externally arranged laser is incident into the reactor through the laser window; the inner wall of the reactor is provided with a curved surface or an inclined plane mirror surface, and laser is refracted for multiple times to form a laser barrier. The laser optical path system is characterized in that according to the characteristics of a laser beam and an air microorganism action system, various influencing factors are cooperated, the cost is taken as an optimization target, the high-efficiency and low-cost laser optical path system is constructed, and the application of a laser technology on air microorganism inactivation is promoted.

Description

Laser optical path system with laser biological inactivation function
Technical Field
The invention relates to a laser optical path system with a laser biological inactivation function, and belongs to the technical field of air sterilization.
Background
The spread of pathogenic microorganisms in crowded places seriously damages human health and is in a high-prevalence state in China. In recent years, outbreaks of influenza have become common in places such as hospital outpatients and schools, and the incidence of hospital-acquired infections has also increased. With the progress of science and technology, people are aware of the harm of microorganism transmission in the air deeply, and meanwhile, the technical demand of rapidly and effectively reducing the transmission of pathogenic microorganisms under the extreme condition of the existence of highly pathogenic infectious microorganisms is also provided. In fact, everywhere people gather needs healthy air, and therefore research on removing pathogenic microorganisms in the air is of great practical need and significance. There have been some studies on how to remove pathogenic microorganisms in the air, and the related practical techniques are mainly classified into two types: firstly, a filtering method of a high efficiency air filter (HEPA) is adopted, and secondly, a method of ultraviolet irradiation is adopted.
HEPA air filters remove microorganisms from air by using a filter material having nano-or micro-pores, thereby inhibiting their propagation in the air. Research shows that the variety of microorganisms in the air is various, and the size of the microorganisms such as viruses and bacteria is in the range from dozens of nanometers to dozens of micrometers. When the air filter is used for removing nano-scale microorganism particles, the filter with smaller pore size is needed, but the air resistance is increased, and the energy consumption of the equipment is seriously increased; because the filter needs frequent replacement and maintenance, the cost of air purification is greatly improved, and the air purification device is not suitable for large buildings. Furthermore, HEPA filters do not actively kill pathogenic microorganisms, they are trapped and retained in the filter media of the filter, making disposal of the discarded filter cumbersome and causing environmental problems.
Ultraviolet radiation is a mature disinfection mode and has good inactivation effect on bacteria, viruses and chlorine-resistant protozoa. However, the ultraviolet rays are harmful to the human body and thus can be used only in an unmanned space. In fact, human activity can significantly increase the microbial content of indoor air in a short period of time during which the ultraviolet lamp is not operational. In order to solve the problems of the ultraviolet lamp, an ultraviolet sterilizing purifier has been developed and used, which has an ultraviolet lamp built in a machine to shield the ultraviolet rays from contacting a person, and a fan to allow indoor air to pass through an ultraviolet irradiation area, thereby performing uninterrupted work. The ultraviolet ray air sterilizer can achieve the effect of removing pathogenic microorganisms in the air, but has some problems. The ultraviolet sterilization technology is the most importantThe problem is that the microorganisms can be completely inactivated by long-time ultraviolet irradiation, and the accumulated ultraviolet radiation dose is up to 2000-10000 muJ/cm2The microorganisms can be effectively killed. In a study of irradiation of SARS-COV virus with 254nm ultraviolet light, when the ultraviolet intensity is 4016 μ W/cm2When the virus is completely inactivated, the irradiation time is 15 minutes, and the cumulative dose reaches 3.6J/cm2. Therefore, in order to achieve higher dosage, it is necessary to maintain the ultraviolet sterilization apparatus for a longer time or for a plurality of cycles, which results in low purification efficiency, slow speed, and high energy consumption due to a large amount of wind for a plurality of cycles. In addition, if some highly pathogenic microorganisms cannot be killed in the process of entering the purifier, the wind circulation action of the instrument can accelerate the diffusion of the microorganisms, and the negative effect is brought.
Despite the considerable research on the use of laser technology to kill microorganisms, there have been few reports on laser technology to kill microorganisms in the air to date. Some key scientific problems of the laser technology for killing the microorganisms in the air are not clear, for example, when the laser acts on a microorganism monomer or aerosol in a suspension state in the air, the influence rule of parameters such as laser intensity, pulse energy, pulse width and the like is not clear, and the divergence and focusing of a laser light path are realized. In addition, the laser beam is narrow, the energy is concentrated, the microorganism content in the air is low, how to enable the laser beam to hit the microorganisms floating in the space is achieved, and the full utilization of the laser energy is a complex multivariable problem.
Along with the improvement of understanding of harm of microorganisms in the air by people, the enrichment of the types of lasers and the great reduction of the price of the lasers, the lasers have potential application value in removing the microorganisms in the air, can realize the rapid inactivation of the microorganisms in the air, and further reduce the purification cost of the microorganisms in the air. Therefore, the patent proposes to use the laser technology to inactivate microorganisms in the air, to carry out research on the multivariable optimization design theory and other problems of the laser light path, and provides several novel light path systems applied to the inactivation of microorganisms in the air. The optical path system has the characteristics of high efficiency, low cost, stable performance and long maintenance period.
Disclosure of Invention
The invention aims to solve the technical problem of providing a laser optical path system with a laser biological inactivation function, which is used for constructing a high-efficiency and low-cost laser optical path system by cooperating with various influencing factors according to the characteristics of a laser beam and a microorganism action system in air and taking cost as an optimization target, and promoting the application of a laser technology on air microorganism inactivation.
In order to solve the above problems, the specific technical scheme of the invention is as follows: a laser optical path system with a laser biological inactivation function utilizes the reflection effect of a reflector on laser to construct a reactor of a high-intensity laser field in a fixed space range; one end of the reactor is provided with a gas inlet, and the other end of the reactor is provided with a gas outlet; a laser window is arranged in the wall of the container of the reactor, and laser emitted by an externally arranged laser is incident into the reactor through the laser window; the inner wall of the reactor is provided with a curved surface or an inclined plane mirror surface, and laser is refracted for multiple times to form a laser barrier.
The laser barrier is perpendicular to the gas flow direction or parallel to the gas flow direction.
A dynamic laser field is constructed in the reactor by utilizing a laser high-speed vibrating mirror, and the direction of a laser beam is parallel to the direction of the gas flow.
The reactor be square pipeline, two opposite faces of square pipeline are equipped with the plane mirror, the laser window is located the tip of one of them plane mirror, the laser pencil that the laser produced jets into square pipeline through the laser window slant, the laser pencil is turned back between two mirrors, constitutes the laser barrier that has fixed height and degree of depth.
The laser is CO2A laser, a solid state laser, a fiber laser, or a semiconductor laser.
The power of the laser is 5 mw-3000 w, and the frequency characteristics comprise continuous laser and pulse laser.
The laser optical path system with the laser biological inactivation function can inactivate microorganisms in the air, so that the air purification effect is achieved.
The laser light path system with the laser biological inactivation function adopts the laser barrier arranged in the reactor, and effectively inactivates microorganisms.
The further reactor is of a square tube structure, and a laser beam is parallel to or perpendicular to the gas inlet direction to realize a laser barrier.
The laser energy adjusting method of the laser optical path system with the laser biological inactivation function can study the influence of laser parameters on microorganism inactivation by changing laser parameters, can also change microorganism types and study the influence of laser irradiation on different microorganism types. In addition, the reaction device can be used for researching and simulating the influence of dust and water vapor in the air on laser inactivated microorganisms.
Drawings
Fig. 1 laser field with laser beam parallel to the gas flow.
Fig. 2 a dynamic optical path system.
Fig. 3 is a schematic view of a laser field with the laser beam perpendicular to the gas flow.
FIG. 4 is a graph of colony growth in petri dishes without laser inactivation.
FIG. 5 is a graph of colony growth in a fully laser-inactivated petri dish culture.
Detailed Description
Example one
As shown in fig. 1, a laser optical path system with a laser biological inactivation function, wherein a gas inlet 2 is arranged at one end of a reactor, and a gas outlet 3 is arranged at the other end of the reactor; a laser window is arranged in the wall of the container of the reactor, and a laser line beam emitted by an externally arranged laser 6 is incident into the reactor through a laser window 5; the inner wall of the reactor is provided with a curved surface or an inclined plane mirror surface 1, and laser is refracted for multiple times to form a laser barrier; the laser beam generated by the laser 6 is parallel to the gas flow direction to realize that the laser beam fills the pipeline.
Wherein the laser is CO2A laser, a solid state laser, a fiber laser, or a semiconductor laser. The power of the laser is 5 mw-3000 w.
Example two
As shown in fig. 2, when the selectable laser power is strong enough, the laser 6 constructs a dynamic laser field in the reactor through the laser high-speed vibrating mirror 4, and the laser beam direction is parallel to the gas flow direction, and a dynamic light field with certain spatial distribution can be produced inside the ventilation duct by using the laser high-speed vibrating mirror. By reasonably configuring the power of the laser and the scanning speed, the laser energy accumulated on a single microorganism can exceed the limit borne by the microorganism, and the inactivation effect of the microorganism is realized. The utilization rate of laser in the light path scheme is low, and the laser galvanometer and the reflector can be combined for use so as to improve the utilization rate of laser energy.
EXAMPLE III
As shown in fig. 3, the inner wall at the reactor is equipped with curved surface or inclined plane mirror surface, refract laser many times and form the laser barrier, the reactor be square pipeline, two opposite faces of square pipeline are equipped with plane reflector 1, the laser window is located the tip of one of them plane reflector, laser beam that laser 6 produced jets into square pipeline through the laser window slant, laser is turned back between two reflectors, when the reflection point surpassed the reflector top, utilize a separation reflector to reflect the laser beam downwards with certain incident angle, the same reason also sets up same separation reflector in the bottom of reflector, thereby realize that the laser beam is retrained and is filled between two reflectors. The laser field with certain height and depth is constructed by filling the laser in the height direction and the depth direction, and the direction of the laser beam is vertical to the direction of the gas flow. The rest of the structure is the same as the first embodiment.
In the three embodiments, the laser energy adjusting method of the laser optical path system with the laser biological inactivation function includes the following steps: arranging a culture dish filled with a culture medium at an air outlet of the reactor, wherein active microorganisms in the air at the outlet can impact the culture dish under the drive of air flow; observing the bacterial colony condition after the culture dish is placed in a constant temperature incubator for 20-48 hours as shown in figure 4, qualitatively inactivating the performance of microorganisms in the air by laser according to the number of the bacterial colonies, changing the distance between an air inlet and an air outlet or the flow rate of carrier gas according to the number of the bacterial colonies, adjusting the action time of the laser and the microorganisms, and finally achieving the number of the bacterial colonies of the culture dish as shown in figure 5, namely being qualified.
A laser optical path system with a laser biological inactivation function adopts an application of a laser barrier to the inactivation of microorganisms in the air.

Claims (7)

1. A laser optical path system with a laser biological inactivation function is characterized in that: constructing a reactor of a high-intensity laser field in a fixed space range by utilizing the reflection effect of a reflector on laser; one end of the reactor is provided with a gas inlet (2), and the other end is provided with a gas outlet (3); a laser window (5) is arranged in the wall of the container of the reactor, and laser emitted by an externally arranged laser (6) is incident into the reactor through the laser window (5); the inner wall of the reactor is provided with a curved surface or an inclined plane mirror surface (1) which refracts the laser for multiple times to form a laser barrier.
2. The laser optical path system with laser biological inactivation function as claimed in claim 1, wherein: the laser barrier is perpendicular to the gas flow direction or parallel to the gas flow direction.
3. The laser optical path system with laser biological inactivation function as claimed in claim 1, wherein: a dynamic laser field is constructed in the reactor by utilizing a laser high-speed vibrating mirror (4), and the direction of a laser beam is parallel to the direction of the gas flow.
4. The laser optical path system with laser biological inactivation function as claimed in claim 2, wherein: the reactor be square pipeline, two opposite faces of square pipeline are equipped with plane mirror (7), the laser window is located the tip of one of them plane mirror, the laser pencil that laser instrument (6) produced jets into square pipeline through the laser window slant, the laser pencil is turned back between two mirrors, constructs the laser barrier that has fixed height and degree of depth.
5. As claimed in claim 1 or 2The laser optical path system with the laser biological inactivation function is characterized in that: the laser is CO2A laser, a solid state laser, a fiber laser, or a semiconductor laser.
6. The laser optical path system with laser biological inactivation function as claimed in claim 1 or 2, wherein: the power of the laser is 5 mw-3000 w, and the frequency characteristics comprise continuous laser and pulse laser.
7. The laser optical path system with laser biological inactivation function as claimed in claim 1 or 2, wherein microorganisms in the air can be inactivated, thereby achieving the effect of purifying the air.
CN202110695725.7A 2021-06-23 2021-06-23 Laser optical path system with laser biological inactivation function Pending CN113406794A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040228756A1 (en) * 2002-08-12 2004-11-18 Berry Lambert Darryl Laser air purifying, decontamimating, and sterilizing unit
CN111603599A (en) * 2020-05-09 2020-09-01 福建新位激光科技有限公司 Air curtain type laser aerosol disinfection device and use method
CN111920998A (en) * 2020-09-28 2020-11-13 武汉光谷航天三江激光产业技术研究院有限公司 Ultraviolet laser and LED light composite disinfection device and method
CN111939304A (en) * 2020-10-19 2020-11-17 武汉光谷航天三江激光产业技术研究院有限公司 Laser virus killing device based on beam shaping and refraction and reflection control
CN112202037A (en) * 2020-10-13 2021-01-08 李学立 Cavity type ultraviolet laser virus killing device
CN112413796A (en) * 2020-11-25 2021-02-26 北京新风航天装备有限公司 Sterilizing equipment for air purification based on ultraviolet pulse laser
CN112675351A (en) * 2020-12-22 2021-04-20 武汉菩济医疗科技有限公司 Ultrafast laser light curtain and air purification system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040228756A1 (en) * 2002-08-12 2004-11-18 Berry Lambert Darryl Laser air purifying, decontamimating, and sterilizing unit
CN111603599A (en) * 2020-05-09 2020-09-01 福建新位激光科技有限公司 Air curtain type laser aerosol disinfection device and use method
CN111920998A (en) * 2020-09-28 2020-11-13 武汉光谷航天三江激光产业技术研究院有限公司 Ultraviolet laser and LED light composite disinfection device and method
CN112202037A (en) * 2020-10-13 2021-01-08 李学立 Cavity type ultraviolet laser virus killing device
CN111939304A (en) * 2020-10-19 2020-11-17 武汉光谷航天三江激光产业技术研究院有限公司 Laser virus killing device based on beam shaping and refraction and reflection control
CN112413796A (en) * 2020-11-25 2021-02-26 北京新风航天装备有限公司 Sterilizing equipment for air purification based on ultraviolet pulse laser
CN112675351A (en) * 2020-12-22 2021-04-20 武汉菩济医疗科技有限公司 Ultrafast laser light curtain and air purification system

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Application publication date: 20210917