Fig. 1. Structure of high-power UVC germicidal lamp. (a)‒(c) Schematic diagrams of UVC-LED device circuit structure

Fig. 2. Optical simulation results of LED array. (a)‍‒(d) No reflective cup, large reflective cup, small reflective cup, and fish scale microwave reflective cup simulation intensity distribution maps; (e) structure diagram of the fish scale microwave reflective cup; (f)‒(h) irradiation power density distribution at distances of 5 cm, 10 cm, and 20 cm from the light source

Fig. 3. Parameters of the cuvettes. (a) Schematic diagram of different thickness cuvettes; (b) schematic diagram of quartz incident refraction

Fig. 4. Light transmission spectra of different ice layers. (a) Light transmission spectra of ice layer with different thicknesses; (b) light transmission spectra of soft-frozen and quick-frozen ice layers; (c) light transmission spectra of transparent ice; (d) light transmission spectra of white ice

Fig. 5. Schematic diagrams of preparation of transparent ice and opaque ice

Fig. 6. Transmittance of 15 mm thick transparent ice and opaque ice in the wavelength range of 200‒400 nm

Fig. 7. Schematic diagrams of COMOSOL simulation. (a) Wave optical module simulation; (b) ice layer module of optical simulation without bubble; (c)‒(f) simulation of ice layer with different bubble densities at 275 nm UV light incidence