Reflectance measurements of building materials in the far UVC (222 nm) wavelength range

Holger Claus; Catherine C. Cooksey

doi:10.1117/12.2633541

3 October 2022 Reflectance measurements of building materials in the far UVC (222 nm) wavelength range

Holger Claus, Catherine C. Cooksey

Proceedings Volume 12201, UV and Higher Energy Photonics: From Materials to Applications 2022; 1220106 (2022) https://doi.org/10.1117/12.2633541
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States

Abstract

Recently the application of far ultraviolet (UVC 200-230nm) optical radiation for disinfection of occupied spaces has seen a growing interest. Filtered excimer krypton-chloride (KrCl) lamps, which emit predominantly at 222 nm, have been shown to provide similar or better pathogen reduction rates, while being safe for human eye and skin exposure at much higher dose levels than the typical 254 nm radiation. This opens new opportunities to provide disinfection of air and surfaces while people are present. The installations of 222 nm light fixtures are professionally planned using adopted light planning software. In order to achieve reasonable accurate radiation distribution models and predict the applied UV dose levels, the reflectance of the materials found in the space needs to be considered. Unfortunately, there is very little literature on the reflectance of interior building materials in the UV. The paper presents a simplified setup for collecting reflectance data, using an existing polytetrafluoroethylene (PTFE) sphere, a 222 nm radiometer, and a filtered excimer KrCl lamp. Common building materials have been investigated with this method and most of them showed a diffuse reflectance of about 10%. Reflectance measurements were also made by the National Institute for Standards and Technology (NIST) for the purpose of validating the method. Advantages and disadvantages of the applied method are discussed.

Conference Presentation

Citation Download Citation

Holger Claus and Catherine C. Cooksey "Reflectance measurements of building materials in the far UVC (222 nm) wavelength range", Proc. SPIE 12201, UV and Higher Energy Photonics: From Materials to Applications 2022, 1220106 (3 October 2022); https://doi.org/10.1117/12.2633541

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available