5/6/2023 0 Comments Uv processing for macSolar blind photodetectors sensitive in the UV region of spectrum can be fabricated using compound semiconductor materials, such as gallium nitride and silicon carbide. One of the emerging applications is diagnostics of “ozone holes”, where increased amounts of ground-level ultraviolet radiation are registered due to ozone depletion effects in the atmosphere. UVC/UVB sensors are needed in many other applications as well. As in most RFID systems, power consumption and sensor cost are also critical constraints. Suitable sensors must have sensitivity to UVC/UVB and high UV to visible rejection ratios (low sensitivity to the visible light in the sanitized environment). An RFID reader gathers the information transmitted from RFID-enabled sensors and verifies that the sanitizing procedure is completed. Individual sensors installed in the positions, where high concentrations of the viruses are expected, measure the dose of UVC irradiation. UV sensors integrated with RFID tags are used to control efficiency of COVID sterilization in an airplane cabin. It is often desirable to use them as elements of wireless sensor networks.Īn exemplary setting is shown in Fig.1. Smart UV monitoring suggests using large number of such sensors. The challenge is how can we control and ensure that the disinfection was indeed successful? To guarantee the efficiency of sanitizing, it is necessary to measure the dose of ultraviolet in specific locations. Portable UVC sanitizers became popular for disinfecting airplane cabins and cars and are already used by several airline and car rental companies. Safety is difficult to achieve when handheld UVC sources are used. Versatile types of sensors are needed for UVC/UVB sanitizing systems. Therefore, UV sensors must also monitor the UV dose for the safety of people in rooms, cars, airplane cabins, etc., where irradiation is performed. This is not the case when disinfection is performed in open spaces where people are present. The same is when ultraviolet sources are being installed in air-conditioning and water irradiating systems. can be placed into enclosed sanitizers which typically are of no danger to people. Personal items, like coats, protection masks, smartphones, banknotes etc. It is necessary to guarantee that the processed surfaces receive sufficient doses for sterilization. Much of the recent innovation in the sterilization field has been focused on devices for measuring parameters of UVC/UVB radiation and other types of sensors integrated in irradiation equipment. Sterilization of Covid viruses strongly stimulated demand for germicidal mercury lamps, UVC LEDs and various UV irradiating systems. The reported doses of UV radiation necessary for 99.9%-99.99% disinfection are in the range from a few to hundreds of mJ/cm2, depending on the wavelength of UVB/UVC, properties of surfaces and the specific environment. UVB (320-280 nm wavelength) and UVC (200-280nm) are destructive for Covid-19 RNA, while UVC with wavelength shorter than 260nm also damages the protein coats of Covid-19 viruses. It was reconfirmed by several groups that ultraviolet efficiently killed viruses and, in particular, SARS-CoV-2. Covid-19 pandemic sparked additional interest in using UV light for disinfection. UV radiation is very efficient in eliminating dangerous microbes in air, water and different surfaces. Sterilization by UV radiation has been used extensively in past decades. In 1903, Niels Ryberg Feinsen was awarded a Nobel Prize for using ultraviolet “chemical light” against causing diseases infectious agents. TPSCo Corporate Social Responsibility Principlesĭisinfection using UV light is known for more than a century.
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