Method for calculating irradiance of ultraviolet germicidal lamp at any position in space

By employing Monte Carlo ray tracing and 3D model reconstruction methods, the challenge of simulating the 3D spatial distribution and spectral information of ultraviolet light sources was solved, enabling the assessment of the sterilization capability and safety of ultraviolet lamps. This method is applicable to light source models with complex shapes.

CN117315150BActive Publication Date: 2026-06-19XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIAMEN UNIV
Filing Date
2023-09-26
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing technologies cannot accurately simulate the three-dimensional spatial distribution and spectral information of ultraviolet light sources, making it impossible to effectively assess their bactericidal performance and safe human exposure time.

Method used

A method combining Monte Carlo ray tracing with 3D model reconstruction of the light source was adopted. The 3D model of the luminaire was reconstructed using SFM and MVSNet, and LR-Net was used to identify rotationally symmetric luminaires. Monte Carlo ray tracing was combined to simulate the spectral irradiance distribution and calculate the sterilization time and safe exposure time at any location.

Benefits of technology

It enables rapid simulation of the spectral irradiance of the ultraviolet light source surface and at arbitrary locations, accurately assesses the disinfection time of different bacteria and the safe exposure time for humans, and is applicable to light source models with complex shapes.

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Abstract

A method for calculating the irradiance of an ultraviolet germicidal lamp at any spatial location is disclosed, relating to the fields of ultraviolet lamp spectral irradiance testing and sterilization capability assessment. 1) 3D lamp reconstruction: Determine if the lamp conforms to rotational symmetry about its central axis. If not, reconstruct the 3D model of the lamp using SFM and MVSNet; if it does, use the fast 3D reconstruction method LR-Net to reconstruct the 3D model. 2) Monte Carlo ray tracing: Divide the acquired near-field light distribution of the light source into micro-facet light sources, establish certain sampling rules for the emitting surface and assign weights, and use random sampling to generate a large number of rays reaching the surface of the emitting body. Using the landing point on the surface of the emitting body as a new starting point, trace the spectral information of each ray to the receiving surface. Divide the receiving surface into grids and statistically analyze the spectral irradiance at corresponding locations. Based on the spectral irradiance information, calculate the sterilization time of different types of bacteria and the safe exposure time for humans at different wavelengths at any location.
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