WO2015024094A1 - Appareil uv et procédé de désinfection d'air - Google Patents

Appareil uv et procédé de désinfection d'air Download PDF

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Publication number
WO2015024094A1
WO2015024094A1 PCT/CA2013/050641 CA2013050641W WO2015024094A1 WO 2015024094 A1 WO2015024094 A1 WO 2015024094A1 CA 2013050641 W CA2013050641 W CA 2013050641W WO 2015024094 A1 WO2015024094 A1 WO 2015024094A1
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WO
WIPO (PCT)
Prior art keywords
light
air
air flow
flow structure
light source
Prior art date
Application number
PCT/CA2013/050641
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English (en)
Inventor
Ashraf Najeeb KHALID
Alexander Novikov
Original Assignee
Khalid Ashraf Najeeb
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Khalid Ashraf Najeeb filed Critical Khalid Ashraf Najeeb
Priority to PCT/CA2013/050641 priority Critical patent/WO2015024094A1/fr
Publication of WO2015024094A1 publication Critical patent/WO2015024094A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/16—Connections to a HVAC unit

Definitions

  • This invention relates generally to UV germicidal irradiation. More specifically, this invention relates to the use of UV light for air disinfection.
  • UVC Ultra Violet C
  • Pathogens can be a serious issue in public buildings and especially in hospitals where over 100,000 persons die every year in the USA because of pathogens infections. Pathogens are spread from infected individuals through touch and through circulating air. Removal of pathogens is very difficult. Air filtration is commonly used but does not inactivate pathogens; filtration makes matters worse by providing sites for the pathogens to multiply as filtration alone does not kill them. Early attempts at removing pathogens from the air by filtering them out was disclosed by M. WILEY et al in US patent 3,347,025. HEPA filters were disclosed by Mark A. Tuckerman et al in US patent 5,616,172. Periodic replacement of the filters can solve the problem some of the problems but at a cost of very frequent maintenance. Furthermore smaller pathogens, like viruses, cannot be removed by filtering.
  • UVC ultraviolet C
  • the ozone layers shields the planet form these wavelengths of electro-magnetic radiation. All life forms are extremely sensitive to these wavelengths and cells are destroyed with small doses of this radiation. In simple organisms, this means immediate death, in complex organisms, it means various cancers and cellular destruction leading to death.
  • the use of UVC to inactivate pathogens is widespread. Traditionally UVCs are generated through mercury arc lamps and through gas discharge tubes. These sources produce a complex spectrum of electromagnetic radiation not all of them efficient for pathogen inactivation. Furthermore UVC generated using mercury and fluorescent lamps are costly, produce ozone, and maintenance and heat generated by these lamps are barriers to large scale adoption.
  • US 2005/0249630 A1 by Olubunmi Ayodele Odumuye et al. discloses a method wherein UV light produced by light tubes is used to purify the air or other carriers of pathogens such as water. This method suffers from the drawbacks of all of the above methods, namely it is costly and produces ozone.
  • US 2010/0320440 A1 teaches producing electromagnetic radiation in UVC, specifically 365 nm, aimed at killing pathogens. This method is effective provided there is sufficient time to overcome the low power of these devices and is confined to purifying water in small containers over hours.
  • the invention relates to air disinfecting UV light source comprising a diode-pumped infrared laser to generate an IR fundamental beam, a second and fourth harmonic frequencies generators for producing a UV light beam using the fundamental beam, and optical elements for optically coupling the UV light beam to an air flow structure to inject substantially dispersed UV light into the air flow structure, the substantially dispersed UV light having sufficient energy to inactivate pathogens.
  • an air disinfecting system comprising an air disinfecting UV light source comprising a diode-pumped infrared laser to generate an IR fundamental beam, a second and fourth harmonic frequencies generators for producing a UV light beam using the fundamental beam, and optical elements for optically coupling the UV light beam to an air flow structure to inject substantially dispersed UV light into the air flow structure, the substantially dispersed UV light having sufficient energy to inactivate pathogens and an air flow structure optically coupled to the UV light source.
  • an air disinfecting UV light source comprising a diode-pumped infrared laser to generate an IR fundamental beam
  • a second and fourth harmonic frequencies generators for producing a UV light beam using the fundamental beam
  • optical elements for optically coupling the UV light beam to an air flow structure to inject substantially dispersed UV light into the air flow structure, the substantially dispersed UV light having sufficient energy to inactivate pathogens and an air flow structure optically coupled to the UV light source.
  • an air disinfecting system comprising a solid state UV light source substantially ozone-free producing for generating a UV light beam, an air flow structure optically coupled to said solid state UV light source, and optical elements for optically coupling the UV light beam to the air flow structure to inject substantially dispersed UV light into the air flow structure, the substantially dispersed UV light having sufficient energy to inactivate pathogens.
  • Figure 1 is a schematic representation of the UV air disinfecting apparatus in association with an air duct.
  • Figure 2 is a schematic diagram of a configuration of optical components of the harmonic frequencies generator.
  • Figure 3 A is a cross-section of an air duct showing a light injection port with a circular geometry.
  • Figure 3 B is a cross-section of an air duct showing a light injection port with a rectangular geometry.
  • Figure 4 is a schematic representation of a system in which the harmonic UV light generator is coupled with an air duct with an optic fiber.
  • Figure 5 is a flow chart diagram of the circuit for feedback control of light intensity using air flow structure environment parameters measurements .
  • Figure 6 is a cross-section view of an air duct showing two UV light generator opposite each other.
  • Figure 7 is a schematic representation of an insertable air flow structure optically coupled to a UV light generator.
  • the air disinfecting apparatus of the present invention provides an efficient way of delivering UV radiation to an air flow structure, such as an air duct or HVAC, to kill pathogens and therefore substantially disinfect the air rendering it more healthy to breathe.
  • the apparatus 1 is schematically represented in FIG.1 when coupled to an air duct 2 through light injection ports 3.
  • the UV light is generated through a two-stage frequency doubling optical assembly using a fundamental infrared (IR) beam.
  • Figure 2 schematically represents an exemplary embodiment of the various components of a UV light generator of the invention that generally comprises a light source (laser) to produce a fundamental beam that is then transmitted through optical components to generate harmonic frequencies resulting in shorter wavelengths beams.
  • An IR light pumping source 10 generates a pumping beam 1 1 directed to a mirror 12 positioned at an angle to the beam and that is highly reflective for the fundamental beam and transparent for the pumping beam.
  • the IR pumping source is preferably a laser diode or a plurality of laser diodes such as to provide a collimated beam.
  • the beam 1 1 from the IR pumping source 10 passes through the mirror 12 into a laser medium 13.
  • the laser medium 13 can comprise Nd:YAG, Nd:YLF, Nd:YV0 4 , Ti:Sapphire or other laser media, and preferably operates at about 1064 nm. It will be appreciated that other laser media, with different wavelengths, may also be used.
  • the laser is a solid-state laser.
  • the light passing through the laser medium 13 strikes mirror 15 that is highly reflective for the fundamental beam.
  • Mirrors 12 and 15 form a resonator for the fundamental beam.
  • the fundamental beam from the laser medium 13 is reflected by the mirror 12 to second harmonic mirror 16 which is highly transparent for the fundamental beam and highly reflective for the second harmonic.
  • the fundamental beam passes second harmonic mirror 16 and enters second harmonic generator 18 where a portion of the beam is converted to a second harmonic beam having a wavelength of approximately 532 nm.
  • the output mirror 19 is at least partially transparent to the second harmonic beam and for the fundamental beam and a portion of the fundamental beam is reflected back into the second harmonic generator 18 where a further portion of the fundamental beam is converted to the second harmonic beam.
  • the mirror 16 transmits the fundamental beam for further amplification in the laser medium 13.
  • Mirror 19 can be partially reflective to second harmonic beam so as to create a resonant cavity between mirror 16 and mirror 19.
  • the second harmonic beam and the unconverted fundamental beam then travel through the beam shaping optics 20 and 22.
  • the shaping optics can be one or more lenses, mirrors, prisms or any other beam shaping optics to optimize the shape of the second harmonic beam and fundamental beam prior to their entry into the fourth harmonic generator 23 where a portion of the fundamental beam and a portion of the second harmonic beam are converted to a fourth harmonic beam having a wavelength of approximately 266 nm.
  • the resulting beams which are the fundamental, second harmonic and fourth harmonic are then separated by output mirror 24 which is reflective for the fundamental and second harmonic beams and at least partially transparent to the fourth harmonic beam.
  • the beam of interest, in this case the fourth harmonic is directed and injected into an air duct through output 25.
  • Mirror 24 can be partially reflective to the fourth harmonic beam to reflect part the fourth harmonic within the resonant cavity created by mirror 24 and mirror 19.
  • Output 25, can be one or several optical components used to couple the UV light generator to an air flow structure and may at the same time be selected such as to provide a beam geometry having dispersion characteristics suitable for dispersing light throughout a desired volume within the air flow structure.
  • the laser can be operated either in continuous wave mode or pulse mode.
  • a Q switch 14 is used to produce pulses. It will be appreciated that pulses with high peak power may be generated as known in the art.
  • an optional optical delay line 21 can be used to enhance the efficiency of the resonant cavity created by mirror 24 and 19 as would be known in the art.
  • the optical configuration described above generates light at approximately 532 nm after the pass in the second harmonic generator and the wavelength is further reduced to 266 nm when passing through the fourth harmonic generator. It will be appreciated that the wavelength of the beam generated by the second and fourth harmonic generators can be determined by the selection and the nature of the laser medium and pumping source.
  • the UV generator can be configured to generate harmonics in different regions of the UV spectrum
  • the UV source of the present invention generates UV radiation in the UVC region which spans wavelengths between 210 nm and 280 nm. More preferably the wavelength(s) generated is between about 250 and 270 nm and more preferably about 266 nm
  • Such narrow bandwidth procures a great advantage over traditional UV light sources used to disinfect air in that light energy is focused at the wavelength, or relative narrow bandwidth, which is most efficient in inactivating pathogens.
  • traditional UV sources exhibit broader bandwidth and therefore have their energy spread out among the wavelengths some of which being wasted on wavelengths that are not efficient at killing pathogens.
  • the intensity (power per unit area) of the harmonic frequency increases with the square of the laser pump intensity according to
  • ⁇ is depends on characteristics of the non-linear material used in the generation of the harmonic such as length of the crystal, effective non-linearity and the like. It can be appreciated that the power of the UV beam resulting from the harmonic frequency generation can be controlled at several levels. Conversion efficiency of the intensity varies according to the mode of laser operation. High intensity conversion efficiency can be achieved with pump light delivered in pulses because of higher peak power of pulses. In continuous-wave mode intensity can be adjusted (increased) using intra-cavity frequency doubling (laser resonator). External resonant cavity may also be used. Other factors, known in the art, such as beam divergence and acceptance angle, also contribute to intensity conversion efficiency and are encompassed as means of intensity modulation for the apparatus and systems of the invention.
  • the generator is preferably configured to deliver UV radiation doses of between approximately 1 to 1000 mW sec/cm 2 . Such doses can inactivate most bacteria, viruses and parasites.
  • the UV radiation doses that can be delivered is dependent on the power of the laser diode and the efficiency of the frequency generator(s). Low power diodes have power output in the mWatts range and high power diodes have output generally higher than 1 Watts. Therefore the power of the laser diode(s) can be selected to provide sufficient power to inactivate pathogens. The power output required to achieve pathogens inactivation will depend on the size of the air flow structure, the flow rate and the like.
  • Frequency doubling (or more generally harmonic frequencies generation) is normally used to produce a source of electromagnetic radiation that is highly collimated (low dispersion), thus requiring high quality optical components especially the non-linear crystals that need to be without structural defects in their crystal lattice.
  • light injected in an air conduit such as an air duct, for the purpose of inactivating pathogens, should reach all or substantially all cross-sectional volume elements in a predetermined section of the conduit to ensure that all pathogens flowing through this cross-section receive a dose sufficient to inactivate them.
  • the optical elements and the choice of materials for these optical elements can be selected so as to optimize beam dispersion and/or relax the requirement for purity of the harmonic generation crystals.
  • Harmonic generators are made of non linear materials. Crystals are generally used and certain organic polymeric materials can also be used. Example of crystals include lithium triborate (LBO), BBO ( ⁇ -barium borate), KDP (potassium di-hydrogen phosphate) KTP (potassium titanyl phosphate) and lithium niobate).
  • LBO lithium triborate
  • BBO ⁇ -barium borate
  • KDP potassium di-hydrogen phosphate
  • KTP potassium titanyl phosphate
  • lithium niobate lithium triborate
  • the type and characteristics of nonlinear material used can affect beam dispersion as, for example, crystal length and the purity of the crystals. In this respect beam dispersion is dependent on optical homogeneity (as measured by homogeneity of refractive index ⁇ ) of the crystals.
  • Non-linear crystals with high levels of homogeneity producing more collimated beams and lower levels of homogeneity producing more dispersion For the present invention and as explained above some dispersion of the beam can be desirable. Accordingly non-linear crystals with ⁇ of up to about 5 x 10 "5 /cm and more preferably between about 2 X 10 "5 /cm and 5 X 10 "5 /cm can be used in the present invention advantageously allowing the use of less expensive crystals. Beam dispersing elements can also be appropriately positioned in the harmonics generator. Because high collimation quality optical components are not required, the cost of the harmonics generator/pathogens inactivation apparatus of the present invention may be reduced when compared to traditional harmonics generators. Thus the present invention combines the advantages of UV harmonic generators such as narrow bandwidth, ozone free UV light generation, inexpensive UV light production with the advantages of using low cost optical components that provides desirable beam dispersion characteristics.
  • the single wavelength or narrow bandwidth UV beam generated with the present system facilitates a shaping of the beam using known optical components to generate a beam of light with the desired geometry and dispersion characteristics when entering the air duct.
  • known optical components for example diffraction gratings, diffusion lens and the like can be used to optically couple the UV beam generator and the air flow structure such as to propagate light throughout a predetermined volume.
  • UV light injection ports can be designed to optimize light propagation within the air flow structure.
  • the size and shape of the aperture will be function of the size and shape of the air duct as well as the spatial light energy distribution needs.
  • a circular aperture 30 or slit design 31 will generate different light propagation patterns as shown in FIG 3 A and 3 B.
  • the former generating a more circular light propagation pattern 32 while the latter produces a more rectangular pattern 33.
  • Other injection port geometries can be designed to adapt light propagation within the air flow structure.
  • Optical elements may also be positioned either inside or outside, or both, the air flow structure to that effect.
  • the design of the UV light generator can be advantageously exploited by optically coupling light transmission elements such as optic fibers 40 as schematically represented in FIG 4.
  • Air ducts in ventilation systems by their design, often have twists and bends that can create volume elements "invisible" to light.
  • a single light injection port within a duct may not allow light to reach every volume element of a cross-section of an air flow therefore allowing some pathogens to pass without being irradiated.
  • an air disinfecting system comprising a UV light source as described above and an air flow structure to which the UV light source is optically coupled.
  • the further embodiments of the system described below solve many of the inherent problems associated with air flow disinfecting.
  • two or more light injection ports are provided at predetermined positions to optimize the illumination of a given volume within an air duct.
  • UV Radiation Generators 1 may be installed in an HVAC (heat ventilation and air conditioning) conduit opposite each other, as is shown in FIG 5.
  • HVAC heat ventilation and air conditioning
  • light injection ports configurations are possible depending on the design of the air conduit and that more than two light injection ports may be used.
  • UV sources may be installed at each light injection port, it is also possible to use light wave guides such as optic fibers to transmit the light to the injection ports as shown in FIG 4.
  • Using wave guides such as optic fibers offers greater flexibility and allows injection ports to be located at difficult to reach positions.
  • the use of multiple injection ports also provides a mean to adjust the desired level of the total dose of radiation in a given volume.
  • the environment within the air flow structure influences the dose required to inactivate pathogens.
  • environment it is meant the light intensity, the air flow, the temperature, the humidity or any other such environment parameter that can affect the survival of pathogens.
  • air flow structure environment parameters detectors are provided to obtain measurements of such parameters that are used in a feedback circuit to control light intensity as a function of the parameters values.
  • UV detectors may be positioned within the air duct and connected to a feedback control electronic circuit that controls the power of the excitation source in the UV generator(s).
  • Dose of radiation is a function of the intensity of the radiation and the time of radiation exposure. Shorter exposure time may be compensated by higher light intensity in order to achieve a similar degree of inactivation. Therefore the speed of the air flow within an air conduit will influence the dose received by airborne pathogens.
  • air flow detectors may be positioned at or near the region of light propagation within the air flow structure.
  • Pathogens are sensitive to the environmental parameters such as temperature and humidity and these parameters can contribute to level of sensitivity of pathogens to UV irradiation. Therefore, temperature and humidity detectors can also be incorporated in the air flow structure to provide measurements that would than be used to adjust light intensity.
  • measurements of air flow 50, light intensity measurements 51, temperature 52 and humidity 53 can be channeled to a processor 54 which will determine the necessary light intensity adjustments as a function of air flow fluctuations and adjust light intensity generated by UV generator 1 to inject light with proper intensity in air flow structure 2.
  • the UV generator of the present invention when coupled to an air flow structure provides a greater flexibility than conventional UV sources.
  • light intensity can advantageously be adjusted by using the UV generator in the pulse mode.
  • the pulse mode enables the control of pulse peak power as well as the frequency modulation of the pulses either individually or together and therefore offers a finer control over the output beam power.
  • optical components within the UV generator can also be adjusted to provide yet another level of light intensity adjustment.
  • the internal surface 60 of the air flow structure is coated with UV reflective material.
  • UV reflective material In addition to ensuring that a given volume of space is filled by UV light by virtue of the multiple reflections of the light, it also provide a means to deliver increase dose by repeated irradiation (through reflection) of pathogens and therefore increasing the cumulative dose to which they are exposed.
  • the air flow structure may consist of an insertable section 70 optically couple to the UV light generator 1 that can be position in a ventilation system such that circulating air 72 is forced through the insertable section.
  • the optical configuration of the insertable section may advantageously be designed to provide selectable light injection configurations. For example multiple injection ports 3 may be installed and when in used, a certain combination of these ports may be selectively activated to optimize the irradiation parameters.
  • light guiding means can be installed to propagate light in the frame prior to being injected inside the insertable section.
  • Such an insertable structure may be rigid or flexible depending on the needs.
  • an air disinfecting system that comprises a solid state UV source substantially free of ozone production that is optically coupled to an air flow structure such as an air duct.
  • the UV source can be a solid state UV laser diode or an UV light emitting diode or it can be generated by the frequency doubling method described above using a diode-pumped IR source to produce a UV beam. It will be appreciated that such a system provides a great advantage over traditional UV irradiation in that the absence of ozone production makes it widely applicable to air circulation systems used in housing and public building.
  • a method for inactivating pathogens comprising providing a UV light source from a harmonic frequency generator with sufficient light power to inactivate pathogens, and injecting the UV light in an air flow structure.
  • the UV light beam generated by the harmonic frequency generator is shaped so as to deliver a substantially dispersed beam within the air flow structure.
  • the shaping of the beam may be accomplished by optimizing the various optical components of the harmonic generator as described above.
  • light intensity within the air flow structure can be controlled by detecting the intensity and providing a feedback control electronic circuit to adjust light intensity.
  • environmental parameters within the air flow structure such as light intensity, air flow, temperature, humidity and the like can be measured and monitored and light intensity adjusted as a function of these parameters.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention concerne un système de désinfection d'air comprenant une source de lumière UV qui comprend un laser pour générer un faisceau fondamental de fréquence prédéterminée et des générateurs de fréquences harmoniques pour produire un faisceau de lumière UV utilisant le faisceau fondamental, une structure de flux d'air et des éléments optiques pour coupler optiquement le faisceau de lumière UV à la structure de flux d'air pour y injecter de la lumière UV sensiblement dispersée, la lumière UV sensiblement dispersée possédant une énergie suffisante pour inactiver des agents pathogènes.
PCT/CA2013/050641 2013-08-20 2013-08-20 Appareil uv et procédé de désinfection d'air WO2015024094A1 (fr)

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PCT/CA2013/050641 WO2015024094A1 (fr) 2013-08-20 2013-08-20 Appareil uv et procédé de désinfection d'air

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PCT/CA2013/050641 WO2015024094A1 (fr) 2013-08-20 2013-08-20 Appareil uv et procédé de désinfection d'air

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017192433A (ja) * 2016-04-18 2017-10-26 三菱電機株式会社 殺菌装置及び空調装置
CN112202037A (zh) * 2020-10-13 2021-01-08 李学立 一种腔式紫外激光杀病毒装置
CN113078836A (zh) * 2021-05-20 2021-07-06 东南大学 基于环流注入的模块化多电平变换器损耗优化控制方法
WO2021205177A1 (fr) * 2020-04-09 2021-10-14 M Squared Lasers Limited Appareil et procédé de stérilisation d'agents pathogènes
JP6990335B1 (ja) 2020-08-18 2022-01-12 広東国志激光技術有限公司 セントラル空調用の殺ウイルス及び滅菌装置
WO2022112789A1 (fr) * 2020-11-27 2022-06-02 Pathogen Reduction systems Limited Système de purification d'air

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6468433B1 (en) * 1997-12-01 2002-10-22 Zamir Tribelski Method for disinfecting liquids and gases and devices for use thereof
US7879288B2 (en) * 1999-03-01 2011-02-01 Johnson & Johnson Vision Care, Inc. Method and apparatus of sterilization using monochromatic UV radiation source
US8192053B2 (en) * 2002-05-08 2012-06-05 Phoseon Technology, Inc. High efficiency solid-state light source and methods of use and manufacture
US20120168641A1 (en) * 2010-09-08 2012-07-05 Lizotte Todd E Uv ptfe diffuser technology
US20130015362A1 (en) * 2011-07-12 2013-01-17 Sharp Kabushiki Kaisha Fluid purification and sensor system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6468433B1 (en) * 1997-12-01 2002-10-22 Zamir Tribelski Method for disinfecting liquids and gases and devices for use thereof
US7879288B2 (en) * 1999-03-01 2011-02-01 Johnson & Johnson Vision Care, Inc. Method and apparatus of sterilization using monochromatic UV radiation source
US8192053B2 (en) * 2002-05-08 2012-06-05 Phoseon Technology, Inc. High efficiency solid-state light source and methods of use and manufacture
US20120168641A1 (en) * 2010-09-08 2012-07-05 Lizotte Todd E Uv ptfe diffuser technology
US20130015362A1 (en) * 2011-07-12 2013-01-17 Sharp Kabushiki Kaisha Fluid purification and sensor system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017192433A (ja) * 2016-04-18 2017-10-26 三菱電機株式会社 殺菌装置及び空調装置
WO2021205177A1 (fr) * 2020-04-09 2021-10-14 M Squared Lasers Limited Appareil et procédé de stérilisation d'agents pathogènes
JP6990335B1 (ja) 2020-08-18 2022-01-12 広東国志激光技術有限公司 セントラル空調用の殺ウイルス及び滅菌装置
JP2022034539A (ja) * 2020-08-18 2022-03-03 広東国志激光技術有限公司 セントラル空調用の殺ウイルス及び滅菌装置
CN112202037A (zh) * 2020-10-13 2021-01-08 李学立 一种腔式紫外激光杀病毒装置
WO2022112789A1 (fr) * 2020-11-27 2022-06-02 Pathogen Reduction systems Limited Système de purification d'air
CN113078836A (zh) * 2021-05-20 2021-07-06 东南大学 基于环流注入的模块化多电平变换器损耗优化控制方法

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