Impact of reflection on the fluence rate distribution in a UV reactor with various inner walls as measured using a micro-fluorescent silica detector

Improved Drinking Water Disinfection with UVC-LEDs for Escherichia Coli and Bacillus Subtilis Utilizing Quartz Tubes as Light Guide

“…According to Li et al, a high reflection coefficient at the inner wall of an UVC reactor can lead to an increased weighted average in fluence rate [13]. The calculations from Figure 8 correspond to these findings.…”

“…Aiming at very high efficiency, a new concept was created by coupling an UVC-LED in parallel to a quartz tube and keeping UVC radiation inside the tube due to total reflection at the walls. With this approach, most of the optical power is available for disinfection along the whole reactor if certain boundary conditions are met [13]. If normal soda-lime or silicate-based glass types, instead of quartz glass, are used in such a reactor design, the incoming UVC-rays will be absorbed almost completely at the walls.…”

Characterization of Spirooxazine and Spiropyran Hosted in Poly(Methyl Methacrylate) for Germicidal UV Source Indicator Application

“…This is particularly true for underdeveloped countries where sources of drinkable water are low and their accesses are limited. A simple method is to use UV-C germicidal wavelength (λ = 253.7 nm) [5,20] to treat water. This method leads to high annihilation rate of bacteria [21,22], high reliability [6], ease of use and can be done cheaply.…”

“…The discs simply change color when the required UV dose has been reached. Also, other studies have been carried out on germicidal UV sensor using optical fiber [9,20]. The objective of our research is to use both spirooxazine and spiropyran as germicidal UV wavelength indicator.…”

Development of monitored tunable biodosimetry for fluence validation in an ultraviolet disinfection reactor

“…In our previous work, a micro-fluorescent silica detector (MFSD) was developed for determination of FR distributions in UV reactors with different lamp configurations, such as a single-lamp reactor [20], a multiple-lamp reactor [21], and a reactor with various reactor walls [22]. Because the MFSD has distinguished features such as high stability, fast response, water resistance, and very small size, it can be easily inserted into the gap between the lamp and the associated quartz sleeve to monitor the real-time drift of lamp output during the practical operation of a UV reactor.…”