Projects related to demonstration and introduction of key technologies for the post-corona era
Research and Development Area 2: Infection Prevention Simulation
R&D Theme
Verification of risk reduction of viral infection by light
Representative Proposer
WADA Satoshi, Team Leader
RAP, Photonics control technology team
R&D Outline
Verification of risk reduction of viral infection by light
(1)Verification of photoinduced virus inactivation
(2)Verification in specific usage scenarios
On key technologies for the post-corona era Projects related to demonstration and introduction
Overview
The inactivation of virus by various wavelengths such as ultraviolet ray has been verified, and the equipment using them is marketed.
However, ultraviolet rays with a wavelength of 254 nm are feared to have an effect on the human body. Excimer lamps with ultraviolet rays with a wavelength of 222 nm are more safety comparing with the light source with wavelength longer than 230 nm. However, there are issues for practical use such as expensive and low power.
In this research, we will examine the effect of inactivating viruses using infrared rays and other light in the wavelength range that is considered not to be harmful to the human body, and verify it in the actual usage scene.
sheet beam generation with 266 nm ultraviolet laser
■The effectiveness of SARS-CoV-2 inactivation using ultraviolet light at wavelengths of 222 nm, 254 nm, and 266 nm has been confirmed, and the mechanism of inactivation has also been clarified in previous studies. *
The light sheet (laser curtain) was formed considering the safety so that the beam may not leak by the damper. *https://www.riken.jp/press/2021/20210705_3/
System Configurations
(1) Distributed feedback semiconductor laser (oscillator)
(2) Fiber amplifier
(3) EO modulator (short pulse)
(4) Photonic crystal gain fiber
(5) 25 W at 1064 nm oscillation
(6) Second harmonic generation > 10 W at 532 nm
(7) Fourth harmonic generation > 2 W at 266 nm
(8) Formation of light sheet (laser curtain)
■A laser curtain 800 mm in width, 1700 mm in height and 10 mm in width was formed.
■The curtain is strong and the SARS-CoV-2 is inactivated when it passes through the curtain.
Installation example of curtain beam in living space
■The photo uses ultraviolet light at a wavelength of 254 nm, and the triangular area makes optical curtain.
■SARS-CoV2 is generally inactivated by passing through the optical curtain. By use of several lights, you can expand the area of curtain.
■Such installation is expected to prevent infection in various living spaces.
