Optical Filter for Far-UV Inactivation With Harmful Band Cutoff
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Solution Overview
Problem
Existing inactivating devices using ultraviolet light struggle to increase intensity in a wavelength band with minimal human impact while avoiding increased intensity in bands that pose health risks, necessitating a solution to adhere to evolving safety regulations and ensure safe operation in environments with human presence.
Innovation Solution
An inactivating device employing an ultraviolet light source with a peak wavelength between 200 nm to 230 nm, combined with an optical filter made of a multilayer dielectric film, configured to transmit wavelengths from 190 nm to 235 nm and set λ5 between 236 nm and 245 nm, reducing harmful light ratios through controlled incidence angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultraviolet light intensity is increased to improve inactivation efficiency, then productivity increases, but harmful factors to human body increase
Solution Approach 1:
The optical spectrum is segmented into multiple wavelength bands using a multilayer dielectric film filter. The filter divides the ultraviolet spectrum into a transmitted band (190-235 nm with low human body impact) and a blocked band (236-320 nm with higher human body impact), allowing selective enhancement of safe wavelengths while suppressing harmful ones. This enables increased overall intensity without proportionally increasing harmful components.
Solution Approach 2:
Different wavelength components of the ultraviolet light are treated differently by the optical filter. The filter applies local quality control by transmitting specific wavelength ranges (190-235 nm) while blocking others (236-320 nm), creating a non-uniform spectral distribution that optimizes both safety and inactivation effectiveness.
2Object-affected harmful factors
If ultraviolet light in wavelength range 190 nm to 230 nm is used to reduce human body impact, then harmful factors decrease, but inactivation efficiency may be reduced
Solution Approach 1:
The spectral parameters of the ultraviolet light are changed by using an excimer lamp with peak wavelength at 222 nm and main emission band at 200-230 nm, combined with an optical filter that transmits 190-235 nm. This parameter optimization maintains low human body impact while achieving sufficient inactivation efficiency through enhanced transmission in the safe wavelength range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively enhances ultraviolet light intensity in a low-risk wavelength band while minimizing exposure in higher-risk bands, ensuring safe operation and compliance with safety regulations, suitable for environments with human presence.
Implementation Method 1
an optical filter including a multilayer dielectric film, wherein with respect to the ultraviolet light incident at an incidence angle of 0 degrees, the optical filter has a band in which the ultraviolet light in a range of wavelengths from 190 nm to 235 nm inclusive is transmitted
Implementation Method 2
a wavelength λ5 at which transmittance of the optical filter indicates 5% is longer than or equal to 236 nm and shorter than 245 nm
Data Source
AI summary
An inactivating device includes: an ultraviolet light source to emit ultraviolet light, a main light-emission wavelength band of the ultraviolet light being at least partly included in a range from 200 nm to 230 nm inclusive; and an optical filter including a multilayer dielectric film, wherein with respect to the ultraviolet light incident at an incidence angle of 0 degrees, the optical filter has a band in which the ultraviolet light in a range of wavelengths from 190 nm to 235 nm inclusive is transmitted, and a wavelength λ5 at which transmittance of the optical filter indicates 5% is longer than or equal to 236 nm and shorter than 245 nm.