An Excimer Lamp To Provide Far-ultraviolet C Irradiation For Dining-table Disinfection
Nov 06, 2023
Measured irradiance on a dining table and numerical model validation
Figure 1 presents the constructed far-UVC lamp for dining-table disinfection, modified from a market-available desk lamp, by replacing the existing lamp for illumination with the excimer lamp (Eden Park, USA). Variation of the table surface irradiance with the incident angle and incident distance is shown in Fig. 2. When the incident distance was maintained at a constant value of 5 cm, the irradiance exhibited a decay pattern with the incident angle, as shown in Fig. 2b. The irradiance reached a peak at the vertical irradiation and decreased to 0.17 mW/cm2, 0.19 mW/cm2, 0.05 mW/cm2, and 0.03 mW/cm2 when the incident angles were increased to 22°, 39°, 50°, and 58°, respectively, in accordance with Lambert’s law. When the incident angle was maintained at 0°, the irradiance decreased with the incident distance, as shown in Fig. 2c. The irradiance was 0.21 mW/cm2 at an incident distance of 5 cm and decreased to 0.06 mW/cm2, 0.03 mW/cm2, and 0.02 mW/cm2 when the incident distance was increased to 10 cm, 15 cm, and 20 cm, respectively, in accordance with the variation of the view factor. The surface-to-surface model (S2S)22 not only successfully predicted the variation of irradiance with incident distance and incident angle but also obtained a relative deviation of less than 15% as compared with the measurement, indicating that the numerical modeling was highly accurate.
