By Tatiana Koutchma, Katja Auer, Peter Gordon, Britt Hafner and Richard Mariita, UV4Good The development of novel germicidal ultraviolet (GUV) light sources opens opportunities for innovative disinfection applications and allows for selecting wavelengths to achieve desired effects while improving safety and quality of GUV sources emitting light in continuous or pulsed modes … [Read more...] about Trends in Evaluation and Measurement of Efficiency of Germicidal Ultraviolet Light Sources
Measurement
Optimizing UV Performance of Low-Pressure Lamps Through Frequency Control
By Tonnie Telgenhof Oude Koehorst, Nedap Optimizing UV Performance of Low-Pressure UV lamps Low-Pressure (LP) amalgam lamps currently are the primary source of UV-C light used in water and air disinfection systems. Globally, the number of UV-C lamps installed in disinfection units is in the millions. This widespread deployment underscores the importance of optimizing … [Read more...] about Optimizing UV Performance of Low-Pressure Lamps Through Frequency Control
Relating Exposure from GUV Systems to Exposure to Ambient UV-B (and UV-A) Solar Radiation
By Annabelle M. Johnson, Division of Environmental & Ecological Engineering, Purdue University, and corresponding author Ernest R. Blatchley III, Division of Environmental & Ecological Engineering and Lyles School of Civil & Construction Engineering, Purdue University The global pandemic that started in late 2019 resulted in more than 700 million diagnosed cases … [Read more...] about Relating Exposure from GUV Systems to Exposure to Ambient UV-B (and UV-A) Solar Radiation
Measuring the Difference in UV-C Emitter Placement Strategies Using Electronic Dosimeters
By Cody Haag, Clean Sweep Group; George Holliday, MPH, and Kenneth Archulet, RN, CIC, Providence Holy Cross Medical Center; Weiming Tang, Ph.D., Institute for Global Health and Infectious Diseases, Gillings Global School of Public Health, University of North Carolina at Chapel Hill; and Pradyumna Swain, Ph.D., EIT2.0 Some of the newest iterations of UV-C room disinfection … [Read more...] about Measuring the Difference in UV-C Emitter Placement Strategies Using Electronic Dosimeters
Development of Reliable Measurement Procedures and UV-C Microbial Inactivation Data on Surfaces
By William Anderson, University of Waterloo; Tatiana Koutchma, Agriculture and Agri-Food Canada; and Richard Dixon, Coalition for Community and Healthcare Acquired Infection Reduction (CHAIR) In response to concerns raised during the SARS-CoV2 pandemic, Health Canada’s Pest Management Regulatory Agency (PMRA) issued a new regulation for the approval of ultraviolet germicidal … [Read more...] about Development of Reliable Measurement Procedures and UV-C Microbial Inactivation Data on Surfaces
Standards and Guidelines for Measuring the Output of UV Lamps and Devices
By Lianfeng Zhang, Laboratory of Ecology and Environmental Protection, Research Institute of Tsinghua University Measurement of the output of UV lamps is critical to the design of standards and guidelines for evaluating and regulating the function of UV devices. Herein, measurement terms are defined, methodology is discussed and standards are reviewed. UV Output/Emittance and … [Read more...] about Standards and Guidelines for Measuring the Output of UV Lamps and Devices
Uncertainty in UV-C Sensor Calibration
By Dan Scharpf, Ph.D., Chief Technologist, Labsphere, Inc. Ultraviolet Germicidal Irradiation (UVGI) is a proven method of disinfection for both bacterial and viral pathogens. To ensure germicidal efficacy is achieved, UV-C light sources need accurate characterization of irradiance (optical power over a given area) and dose (irradiance x time). Knowing the limitations of the … [Read more...] about Uncertainty in UV-C Sensor Calibration
Measuring Hydroxyl Radical Scavenging in UV AOP
By Olya Keen, University of North Carolina at Charlotte, and Laith Furatian, Abbotsford-Mission Water and Sewer Services UV-based advanced oxidation processes (AOPs) are relatively energy intensive compared to conventional water treatment, consuming on the order of 0.1 to 1.0 kWh/m3. 1 Thus, a rational design basis is important to avoid overdesign of AOP systems. Role of … [Read more...] about Measuring Hydroxyl Radical Scavenging in UV AOP
Digital UV Sensors Simplify Measurement and Control
By Tilman Weiss, sglux, and Fred Perry, Boston Electronics Irradiance is the term for the optical energy falling on a surface in units of watts per unit area. In the measurement and control of light for purposes of disinfecting or curing a surface or a volume, usually not only the total optical energy but more specifically the energy within a defined spectral interval is … [Read more...] about Digital UV Sensors Simplify Measurement and Control
Air and Surface Treatment Using Germicidal Ultraviolet-C (GUV)
By Holger Claus, Ushio America, and Michael Clark, Far UV Technologies This article attempts to define and describe key aspects of Germicidal UV (GUV) technology specifically for air and surface disinfection to get a clearer understanding of key values, limitations, opportunities and especially gaps in the understanding of GUV between the researchers, practitioners and … [Read more...] about Air and Surface Treatment Using Germicidal Ultraviolet-C (GUV)