High energy-efficient UV lamps using nano-thin spectrally selective metallo-dielectric layers

使用纳米薄光谱选择性金属介电层的高能效紫外线灯

• 批准号: 531335-2018
• 负责人: Kherani, Nazir
• 金额: $ 1.82万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=655460
• 关键词: energy; efficient; UV; lamps; using

Ultraviolet wastewater treatment systems, produced by Trojan Technologies, are very effective and versatile**optical means for the deactivation of bacteria, viruses, and parasites such as giardia and cryptosporidium.**Current commercial systems prefer the utilization of medium-pressure mecury-vapour lamps since broadband**UV emission has been shown to be desirable given that it reduces photoreactivation* of bacteria. However,**medium-pressure lamps operate at relatively high temperature of 800-900 deg C thereby emitting significant**infrared radiation, and thus are energetically inefficient.**In order to mitigate this energy loss and improve lamp efficiency, an optical coating that transmits in the**UV treatment range (200-320 nm) while reflecting the infrared emission back into the lamp is required. Lamp**efficiency can be improved by using specialized metallo-dielectric coatings wherein ultra-nano-thin Ag layers**and high bandgap ceramic dielectric layers together serve to maximize reflection in the infrared and**transmission in the UV part of the spectrum.**Preliminary modelling results of such structures are quite promising, suggesting high transmission in the**UV and broadband reflection that increases with wavelength in the infrared. Accordingly, significant**enhancement in UV lamp energy-efficiency is deemed potentially viable.**The objective of this project is to experimentally demonstrate the viability of these specialized**metallo-dielectric coatings to render energy-efficient UV lamps, and hence its integration in Trojan**Technologies' product line of UV wastewater treatment systems.**_________*** Photoreactivation is the recovery from biological damage caused by UV radiation as a result of simultaneous**or subsequent treatment with light of longer wavelength.

Trojan Technologies生产的紫外线废水处理系统是非常有效和通用的 ** 光学方法，用于灭活细菌，病毒和寄生虫，如贾第虫和隐孢子虫。目前的商业系统更喜欢使用中压汞蒸气灯，因为宽带 ** 紫外线发射已被证明是可取的，因为它减少了细菌的光复活 *。然而，** 中压灯在800-900摄氏度的相对较高的温度下工作，从而发射显著的 ** 红外辐射，因此能量效率低。为了减轻这种能量损失并提高灯的效率，需要一种光学涂层，该光学涂层在UV处理范围（200-320 nm）内透射，同时将红外发射反射回灯中。通过使用特殊的金属介电涂层可以提高灯 ** 的效率，其中超纳米薄Ag层 ** 和高带隙陶瓷介电层一起用于最大化光谱的红外线部分的反射和紫外线部分的透射。这种结构的初步模拟结果是相当有希望的，表明在紫外线和宽带反射，随着红外线波长的增加，高透射率。因此，显著 ** 提高紫外线灯的能效被认为是潜在可行的。该项目的目标是通过实验证明这些专用 ** 金属介电涂层在提供节能紫外线灯方面的可行性，并因此将其集成到Trojan**Technologies的紫外线废水处理系统产品线中。**_*光复活是从由紫外线辐射引起的生物损伤中恢复，这是由于同时 ** 或随后用较长波长的光处理的结果。