Abstract: A system for mask design repair may develop a simulation-based model of a layer thickness after one or more process steps for fabricating features on a sample, develop a transformed model of the fabrication process that emulates the simulation-based model and has a faster evaluation speed than the simulation-based model, and where the inputs to the transformed model include the input mask design, and where the outputs of the transformed model include one or more output parameters associated with fabrication of the input mask design as well as one or more sensitivity metrics describing sensitivities of the one or more output parameters to variations of the input mask design. The system may further receive a candidate mask design and generate a repaired mask design based on the transformed model and the candidate mask design.

Abstract: A method for judging freshness of cultured fish product based on eye image recognition is provided, which relates to the field of image processing and includes the following steps: obtaining eye area and eye center point of each cultured fish product; obtaining a first data category and a second data category of each gray scale change sequence according to each gray scale change sequence of each eye area; calculating a first mean value and a second mean value of each gray scale change sequence; obtaining the fish eye turbidity of each eye area according to the first mean value and the second mean value; obtaining the fish eye plumpness of each eye area according to the first data category and the second data category; and obtaining the freshness of each cultured fish product according to the fish eye turbidity and fish eye plumpness in each eye area.

Abstract: Apparatus and methods for complex imaging reflectometry and refractometry using at least partially coherent light. Quantitative images yield spatially-dependent, local material information about a sample of interest. These images may provide material properties such as chemical composition, the thickness of chemical layers, dopant concentrations, mixing between layers of a sample, reactions at interfaces, etc. An incident beam of VUV wavelength or shorter is scattered off of a sample and imaged at various angles, wavelengths, and/or polarizations. The power of beam is also measured. This data is used to obtain images of a sample's absolute, spatially varying, complex reflectance or transmittance, which is then used to determine spatially-resolved, depth-dependent sample material properties.

Abstract: A measurement apparatus of a moving paper web, includes an optical radiation source that outputs optical radiation toward a scattering element of the measurement apparatus. The scattering element scatters the optical radiation, and a transmitting surface of the scattering element directs the optical radiation in a scattered manner toward the moving paper web. A distance between said transmitting surface of the scattering element and a surface of the paper web is known, and the transmitting surface and a detector of the apparatus are on opposite sides of the paper web. The detector receives at least a part of the optical radiation, which is side-scattered from the moving paper web. The detector determines a moisture value and a dry weight of the paper web on the basis of spectral information on the received optical radiation and the known distance.

Abstract: A method for testing a value document having a luminescence feature involves guiding the value document past a test sensor in a transport direction. A scanning sequence occurs that repeats itself multiple times upon guiding the value document past the test sensor. The method involves irradiating a test region of the test sensor such that the test radiation is arranged to be remitted by the value document at least partially in a detection spectral range of the test sensor. Excitation radiation is arranged to cause an emission radiation of the luminescence feature in the detection spectral range. The method further involves scanning at least one location-dependent remission spectral value in the test region in the first irradiation phase, irradiating the test region only with the excitation radiation in a second irradiation phase, and scanning at least one location-dependent emission spectral value in the test region after the first irradiation phase.

Abstract: A metrology system serves for examining objects with EUV measurement light. An illumination optical unit serves for guiding the EUV measurement light towards the object to be examined. The illumination optical unit has an illumination optical unit stop for prescribing a measurement light intensity distribution in an illumination pupil in a pupil plane of the illumination optical unit. An output coupling mirror serves for coupling a part of the measurement light out of an illumination beam path of the illumination optical unit. The output coupling mirror has a mirror surface which is used to couple out measurement light and has an aspect ratio of a greatest mirror surface extent A longitudinally with respect to a mirror surface longitudinal dimension (x) to a smallest mirror surface extent B longitudinally with respect to a mirror surface transverse dimension (y) perpendicular to the mirror surface longitudinal dimension (x). The aspect ratio A/B is greater than 1.1.

Abstract: A method of determining a user's exposure to pollution, the method comprising sensing environmental conditions by a detector device, transmitting sensed environmental conditions data from the detector device to a smart device, and alerting the user about personal pollutant exposure by the smart device.

Abstract: A method of stimulating a subterranean carbonate formation includes delivering a composition comprising a hydrophobically modified polymer, a phosphorylated alkyl amino polycarboxylic acid, and a base treatment acid into the subterranean formation; and contacting the subterranean carbonate formation with the composition to form conductive flowpaths in the subterranean carbonate formation. The method may further include producing hydrocarbons from the subterranean carbonate formation. A composition for stimulating a subterranean formation includes a hydrophobically modified polymer; a phosphorylated alkyl amino polycarboxylic acid; and a base treatment acid.

Abstract: A radiation sensing device is provided in the present disclosure. The radiation sensing device includes a substrate and a plurality of semiconductor units. The semiconductor units are disposed on the substrate, and at least one of the semiconductor units includes a first gate electrode, an active layer, and a second gate electrode. The active layer is disposed on the first gate electrode, and the second gate electrode is disposed on the active layer. The second gate electrode has a positive bias voltage during a standby mode. The second electrode may be configured to have a positive bias voltage during the standby mode for improving influence on electrical properties of the semiconductor unit after the semiconductor unit is irradiated by radiation.

Abstract: Disclosed herein are methods, systems, and devices for monitoring cumulative radiation. In one embodiment, a device includes a photodiode; an integrating capacitor electrically coupled with the photodiode; a voltage discharge switch electrically coupled with the integrating capacitor; and amplifier circuitry electrically coupled with the photodiode and the integrating capacitor. The amplifier circuitry is configured to maintain a substantially zero bias voltage between an anode and a cathode of the photodiode monitoring the cumulative radiation. The integrating capacitor is configured to provide a delta voltage representative of radiation received since the beginning of a charge cycle of the integrating capacitor.

Abstract: An elongated lighting module having an asymmetric illumination source formed from at least two rows of light emitting diodes (LEDs) that extend along the long axis of the module and are independently controllable. The illumination source is rectangular and oriented so that the rows of LEDs extend along the long axis of the module. The module has couplings at each end that allow additional modules to be interconnected therewith using a linking member and a clamp. The lighting modules are powered via a wiring harness that extends down a support pole to a power converter stack having LED drivers to control the modules.

Abstract: An image sensing device includes a first pixel array and a second pixel array. The first pixel array includes a plurality of first unit pixels consecutively arranged to generate a first pixel signal through a photoelectric conversion of incident light. The second pixel array is disposed below the first pixel array, and includes a plurality of second unit pixels consecutively arranged to generate a second pixel signal through a photoelectric conversion of the incident light. The first unit pixels are arranged to have a uniform spacing between adjacent first unit pixels in the first pixel array. The second unit pixels are arranged so that spacing between adjacent second unit pixels are not the same in the second pixel array.

Abstract: Embodiments of the present disclosure relate to a flame detector. The flame detector comprises a light guide system including a first end and a second end opposite to the first end, a light path being formed between the first end and the second end and extending along an optical axis; a first hole disposed at the first end, extending along the optical axis and forming a part of the light path, the first hole being configured to receive light emitted by a flame to be detected; and a second hole disposed at the second end, extending along the optical axis and forming a part of the light path, sizes of the first and second holes and a length of the light path being configured such that a detection angle of the light guide system is between 0.5 degrees and 3 degrees.

Abstract: A system for monitoring ultraviolet (UV) exposure of a wearer. The system comprises a wearable device operable to sense UV radiation levels to which the wearer is exposed, and to transmit UV radiation information. The system further comprises an external computing device in remote communication with the wearable device, operable to receive the UV radiation information from the wearable device and configured to determine the wearer's real-time UV index value and the wearer's daily cumulative percentage of minimal erythema dose based upon the UV radiation information.

Abstract: In an electron beam device provided with two columns including an irradiation optical system and an imaging optical system, a photoelectron image for use in adjusting the irradiation optical system is made sharper. The electron beam device includes: an irradiation optical system which irradiates a sample placed on a stage with an electron beam; a light irradiation unit 50 which irradiates the sample with light containing ultraviolet rays; a sample voltage control unit 44 which applies a negative voltage to the sample so that, before the electron beam reaches the sample, the electron orbit inverts; and an imaging optical system which acquires a mirror electron image by forming an image of mirror electrons reflected by application of the negative voltage.

Abstract: An aim is to reduce the size of an optical sensor which detects radiated light such as phosphorescence radiated from a detection target excited by exciting light, and to increase a radiated light receiving surface of the optical sensor. An optical sensor is configured to be provided with: a light source which irradiates excitation light; a light detector which detects radiation light emitted from a detection target excited by the excitation light; and a single light guide unit which guides the excitation light to the detection target and guides the radiation light to the light detector.

Abstract: A radiometer probe for matching a spectral sensitivity of a dry-film resist is provided. The radiometer probe includes a light probe and a filter-diffuser assembly connected to the light probe. The filter-diffuser assembly includes a filter housing configured to receive an optical diffuser positioned on a filter. The optical diffuser and the filter are separated by a spacer.

Abstract: A maintenance method of a gas detecting device includes the following steps: providing the gas detecting device that includes a shell component, a sensing component, a dust blocking element, and a detecting area, the sensing component including a sensor, a reference light source, and a processor, and the dust blocking element including a cover; the reference light source generating a reference beam projecting toward the cover and the detecting area, and the reference beam generating a feedback beam projecting toward the cover and the sensor through being reflected by a part of the shell component positioned at the detecting area; the sensor receiving the feedback beam to generate a measured information; and the processor comparing the measured information to an initial information in the processor, so as to obtain a pollution degree information of the cover.

Abstract: A high-speed, wavelength-converting receiver that includes a housing; a high-speed, wavelength-converting layer attached to the housing and configured to absorb a first light having a first wavelength range and emit a second light having a second wavelength range, which is different from the first wavelength range; and a high-speed photodetector attached to the housing and having an active face configured to absorb the second light having the second wavelength range and generate an electrical signal. The active face of the photodetector is fully placed within the housing.

Abstract: Method for controlling an ozone generating machine (OGM) comprising the steps of: wherein each base setting file (BSF) is dedicated to a type of ozone generating machine (OGM), retrieving and reading a dedicated base setting file (BSF) corresponding to the type of the ozone generating machine (OGM) indicated by a identification code (ID), encoding and writing a system configuration file (Sysconf) based on the dedicated base setting file (BSF), comprising at least a set of sensor coefficients (SK) and a set of actuator coefficients (AK), producing ozone with the ozone generating machine (OGM), said step comprising at least a step of correcting the at least one sensor signal (SSI) with at least one sensor coefficient (SK) or actuating the at least one actuator (ACT) with the at least one actuator control signal (ACS) corrected by at least one actuator coefficient (AK).

Abstract: Methods of accurately estimating erythemaly-weighted UV exposure, such as the UV Index, and sensors adapted for the same.

Abstract: A sample observation device includes a sample container that holds the sample stained with a first fluorescent substance and a solution including a second fluorescent substance, an irradiation unit that performs irradiation with first excitation light and second excitation light, a scanning unit that scans the sample container in one direction, an image formation unit that forms first fluorescent light from the sample and second fluorescent light from the solution, an imaging unit that outputs first image data based on the first fluorescent light and first image data based on the second fluorescent light, an image processing unit that generates a first fluorescent light image based on a plurality of pieces of first image data and a second fluorescent light image based on a plurality of pieces of second image data, and an analysis unit that specifies an area in which there is the sample on the basis of the second fluorescent light image and sets an analysis area in the first fluorescent light image.

Abstract: The light from an optical metrology device is focused into a measurement spot on a sample using a focusing system. The focusing system uses an image of the light reflected from the measurement spot to determine a best focal position at a desired position of the sample. The focusing system selects a characteristic of reflected light, such as polarization state or wavelengths, to use for focusing. The characteristic of the reflected light that is selected for use in determining focal position is affected different by different portions of the sample. For example, light reflected from a top surface of a sample may have a different characteristic than light reflected by an underlying layer. The selected characteristic of the reflected light is used by the focusing system to focus the measurement spot at the top surface or an underlying layer of the sample.

Abstract: A method and apparatus for monitoring collection of subject condition data is provided. The method includes receiving a value of a parameter of subject condition data and a value of a sample time, for each of a plurality of sample times. The method also includes storing the subject condition data in a data structure including a first field for holding data indicating a current sample time and a second field for holding data indicating the value of the parameter. The method also includes determining a time gap defined by a duration between the current sample time and a most recent sample time and determining whether the time gap exceeds a time gap threshold and causing an apparatus to perform remedial action. A method for presenting the subject condition data on a display is also provided.

Abstract: An all-purpose device capable of in vitro spectral analysis of sunscreen compositions as well as diffuse reflectance spectroscopy (DRS) capabilities on human skin includes a fiber optic guide, a light source positioned at one end of the fiber optic guide, and a sunscreen substrate assembly positioned at another end of the fiber optic guide.

Abstract: A flame detection system includes: an optical sensor that detects light emitted from a light source; an applied voltage generating circuit that applies a drive pulse voltage to the optical sensor; a discharge determining portion that detects a discharge from the optical sensor; a discharge probability calculating portion calculates discharge probabilities in a first state and a second state in which the optical sensor is shielded from light and a pulse width of the drive pulse voltage is different; a storing portion storing a reference pulse width as a sensitivity parameter; and a discharge probability calculating portion that calculates a discharge probability of an irregular discharge occurring without depending on the received light quantity by the optical sensor based on the sensitivity parameter, the discharge probabilities calculated in the first and second states and the pulse widths of the drive pulse voltage in the first and second states.

Abstract: A multi-functional precious stone testing apparatus includes a portable housing, a testing unit, and an indication unit. The portable housing includes a hand-held casing and a probe casing extended from a front end of the hand-held casing. The testing unit includes a conductive probe, a sensor, and a UV light source for emitting UV light beam, so as to allow the sensor to sense the UV reflected and refracted by a testing object for determining various qualities of the testing object.

Abstract: A method of analysing an at least partially transparent object, such as a gemstone, includes fixing the object in a holder; immersing the object in the holder in an immersion material; and analysing internal and/or external features of the object. Analysing comprises visualizing an internal and/or external portion of the object using light rays while the object is immersed in the immersion material, and determining characteristics of the object based on the visualized internal and/or external portion of the object. During the analysing step, the difference between the refractive index (RI) of the immersion material and the RI of at least an immersed portion of the holder, which is in contact with the object, is less than 0.3.

Abstract: Certain aspects pertain to a cloud detector comprising a first detector module directed to a first region of the sky and a second detector module directed to a second region of the sky. Each detector module has a tube enclosing one or more sensing elements. The one or more sensing elements of the first detector module are configured to take weather condition readings from the first region of the sky. The one or more sensing elements of the second detector module are configured to take weather condition readings from the second region of the sky. In one aspect, the cloud detector is configured to detect cloud cover based on these weather condition readings. In some cases, the one or more sensing elements comprise an infrared radiation detector (e.g., thermopile) for measuring infrared radiation intensity and a photosensor element for measuring sunlight intensity.

Abstract: A flame detection system includes: a UV sensor that serves as a flame sensor detecting a UV ray generated by a flame; an application voltage generation unit that applies a driving voltage to the UV sensor; a discharge detection unit that detects a discharge in the UV sensor; a discharge count unit that counts the number of detected discharges; a discharge probability calculation unit that calculates a discharge probability on the basis of the number of discharges counted by the discharge count unit and the number of times the driving voltage is applied; a UV intensity determination unit that determines an intensity of the UV ray on the basis of the discharge probability; and a determination result output unit that outputs the intensity of the UV ray determined by the UV intensity determination unit via display or communication.

Abstract: The present invention provides a head-up display apparatus capable of properly presenting information to a wide area. A head-up display apparatus includes: an image light output unit configured to output a first image display light formed by a visible light laser and a second image display light formed by an ultraviolet light laser; a screen that diffuses and transmits the first image display light, and transmits the second image display light without diffusing the second image display light; and a mirror that reflects the first and the second image display lights transmitted through the screen towards a windshield that presents a virtual image to a user by reflecting the visible light laser and presents a real image to the user by receiving the ultraviolet light laser and emitting light by itself.

Abstract: An expansion device includes: an irradiation unit configured to irradiate a thermally-expandable sheet with light; a movement unit configured to relatively move the thermally-expandable sheet and the irradiation unit; an air-blowing unit configured to cool the irradiation unit by blowing air to the irradiation unit; and a control unit configured to execute a distension process of distending the thermally-expandable sheet by causing the irradiation unit to emit light while relatively moving the thermally-expandable sheet and the irradiation unit by the movement unit, wherein the control unit controls the air-blowing unit to stop or weaken blowing air toward the irradiation unit while the irradiation unit is caused to emit light in the distension process.

Abstract: The invention relates to a photosensitive printing composition comprising a photocatalyst which exhibits a photocatalytic effect when exposed to UV and/or visible radiation, a colouring agent that exhibits a colour change in response to the photocatalytic effect, and a film forming agent. The composition has a viscosity suitable for printing. The invention further relates to a sun-exposure sensor comprising a photosensitive layer printed on a surface of a support, the photosensitive layer comprising a photocatalyst which exhibits a photocatalytic effect when exposed to UV and/or visible radiation, a colouring agent that exhibits a colour change in response to the photocatalytic effect, and a film forming agent.

Abstract: A UV detection device is removably attached to a surface of a structure and includes a photodetector to detect UV light incident on the structure. The UV detection device includes signal processing and a transmitter that wirelessly transmits UV detection data to a remote monitoring station where the detection signals are accumulated and analyzed to determine the total exposure of the structure to UV light.

Abstract: A method for plasma treating a surface of a first substrate is disclosed. The method may comprise generating a plasma flume using a plasma treatment device having a nozzle. The plasma flume may emanate through a flume aperture of the nozzle at an emanation angle of about 5 degrees or less. The emanation angle may be defined as an angle between a central axis of the nozzle and a central axis of the flume aperture. The method may further comprise plasma treating the surface of the first substrate with the plasma flume by scanning the plasma flume over the surface of the first substrate. The first substrate may be one of a consolidated thermoplastic material and a cured thermoset material.

Abstract: A system and a method for irradiating an object and potentially for controlling the irradiation or other conditions relating to an effect of the irradiation. A sensor is translated along a longitudinal direction of the radiation emitter and in a space between the radiation emitter and the objects irradiated to arrive at information relating to a parameter relating to the effect of the irradiation, such as the radiation, and derived in the space between the radiation emitter and the objects irradiated. Calibrating the sensor readings and adjusting the radiating emitter output, thereby controlling the irradiation.

Abstract: A laser processing apparatus for processing a wafer along projected dicing lines with a laser beam has a laser oscillator, a polygon mirror having a plurality of reflecting surfaces and rotatable about a central axis thereof, and an f? lens for focusing the beam reflected by the reflecting surfaces of the polygon mirror and applying the focused beam to the wafer. The reflecting surfaces of the polygon mirror include a zero-gradient reflecting surface lying at a zero gradient parallel to the central axis, a positive-gradient reflecting surface that is inclined at a positive gradient from the zero gradient, and a negative-gradient reflecting surface that is inclined at a negative gradient from the zero gradient. The polygon mirror swings the laser beam in a direction perpendicular to a processing feed direction within the width of each of the projected dicing lines and in the processing feed direction.

Abstract: A spectrometer with an unobstructed, Schmidt reflector is described. The spectrometer may include a Schmidt corrector and a dispersive element as separate components. Alternatively, the Schmidt corrector and dispersive element may be combined into a single optical component. The spectrometer may further include a field-flattener lens.

Abstract: Methods and apparatuses for aligning and diagnosing the laser beam traversing an optical train in a highly space-efficient, lower cost and/or retrofit-friendly manner are disclosed. The optical components of the optical train are mounted such that one or more optical components can direct their exit laser beam to partially or wholly scan across one or more downstream sensors. Correlation data between physical disposition of optical components and the points of impact data and/or beam quality data are employed to, among others, align and/or diagnose the laser beam and/or localize failure sites and/or optimize maintenance schedule.

Abstract: The present invention relates to an electronic device and a method for measuring ultraviolet light by using an electronic device including a camera. The electronic device according to various embodiments of the present invention comprises: a display; an image sensor for acquiring an image by using light including a first wavelength band or a second wavelength band; and a processor, wherein the processor can be set so as to compare a first image acquired using the light of the first wavelength band with a second image acquired using the light of the second wavelength band, acquire, on the basis of the comparison result, information on ultraviolet reflectance for at least a part of at least one subject included in the first image or the second image, and display at least a part of the acquired information on the ultraviolet reflectance by using the display.

Abstract: The present invention adopts an aluminum nitride substrate with great heat dissipation, great thermal conductivity, high electrical insulation, long service life, corrosion resistance, high temperature resistance, and stable physical characteristics. A high-quality zinc oxide film with a wide energy gap is fabricated on the aluminum nitride substrate by magnetron radio frequency (RF) sputtering. Compared with general vapor deposition, chemical vapor deposition and hydrothermal, the magnetron RF sputtering grows the high-quality zinc oxide film with few defects. The zinc oxide film with few defects concentration is an important key technology for short-wavelength optoelectronic devices, which decrease leakage currents of the optoelectronic devices, reduces flicker noise, and further improves its UV-visible rejection ratio.

Abstract: According to one embodiment of the present disclosure, there is provided an ultraviolet detector, including: an ultraviolet ray transmitting part configured to transmit ultraviolet ray contained in incident light; a wavelength conversion part configured to convert the ultraviolet ray transmitted through the ultraviolet ray transmitting part into visible light; and a visible light receiving part configured to detect the visible light obtained by the wavelength conversion part.

Abstract: Disclosed herein is a method of measuring an effectiveness of an ultraviolet coating. The method comprises irradiating the UV coating with UV energy comprising a predetermined spectrum of wavelengths. The method also comprises measuring an intensity of the UV energy reflected from the UV coating. The method further comprises comparing a measured intensity of the UV energy reflected from the UV coating with a previously measured intensity of the UV energy reflected from the UV coating to obtain comparison data. The method additionally comprises determining, in response to the comparison data, the effectiveness of the UV coating.

Abstract: A display device which is solid against an external impact is provided. The display device includes: a substrate; a thin film transistor arranged over the substrate; a first organic insulating layer arranged over the thin film transistor; and a first crack induction layer located inside the first organic insulating layer. The first crack induction layer may include an inorganic insulating material and may not overlap the thin film transistor as viewed from a direction perpendicular to the substrate.

Abstract: A computer implemented method for self-administrated testing of eyeglasses, the method comprising computer performed steps, the steps comprising: analyzing at least one image of a predefined pattern reflected from at least one lens of a pair of eyeglasses of a user, and identifying a property of the lens based on the analyzing.

Abstract: An EUV light generating apparatus includes: a chamber device including an inner wall surrounding a space, and a plasma generating region in the space in which plasma is generated from a droplet irradiated with a laser beam; a heat shield including a through-hole and a channel portion, and disposed between the inner wall and the plasma generating region; a gas supply device that supplies gas; a gas introducing cylinder that is provided in the space on a side opposite to the plasma generating region, extends toward the through-hole, and introduces the gas supplied from the gas supply device through the through-hole toward the plasma generating region over the heat shield; and an optical unit optically coupled to the space through an internal space of the gas introducing cylinder and the through-hole. An entire front end surface of the gas introducing cylinder faces the heat shield.

Abstract: A method of controlling application of a dose of light energy for treatment to disinfect an area includes causing the dose of light energy to be emitted from at least one light emitting device, receiving a wavelength and intensity of light emitted from a fluorescent component within the area being disinfected by the dose of light energy, and adjusting at least one of a current, a voltage, a pulse width, and a pulse frequency applied to the at least one light emitting device based on the received wavelength and intensity of the light emitted from the fluorescent component.

Abstract: An imaging system includes: an image sensor sensitive to ultraviolet light and visible light; a lens configured to focus light from a subject onto the image sensor; and an image processor configured to process image signals output from the image sensor. The image processor obtains the difference between image signals A1 and A2 output from the image sensor at times t1 and t2, respectively. If the differential signal A3 is greater than or equal to a predetermined value, the image processor determines that light from the subject contains the ultraviolet light, and generates an image signal CI based on the differential signal A3.

Abstract: In quartz-enhanced photoacoustic spectroscopy (QEPAS), an analyte (typically in gas phase) generates a pressure wave in response to incident laser light. A quartz tuning fork (QTF) resonant at the frequency of the pressure wave transduces the pressure wave into an electrical signal. Pulsing the laser briefly reduces the amount of thermal chirp and increases the fraction of time that the laser emits at the wavelength(s) of interest. This increases the measurement efficiency. Pulsing the incident laser light with bursts of short pulses at the QTF resonant frequency increases signal strength. Exciting the sample with a two pulses at different laser wavelengths, separated by a half QTF period yields signal and background acoustic waves that partially cancel when integrated by the QTF, producing a differential measurement. Pulsing the incident laser light at a frequency faster than the gas response cut off frequency can improve the noise performance of a QEPAS measurement.

Abstract: A refrigeration appliance comprises a cavity in which an ozone generating device is placed. The ozone generating device is configured to maintain in the cavity a concentration of ozone between 0.04 and 0.12 ppm, more preferably between 0.06 and 0.1 ppm.