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Related Experiment Video

Updated: May 24, 2026

An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue

An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue

Published on: June 2, 2023

A radiometry protocol for UVGI fixtures using a moving-mirror type gonioradiometer.

John Zhang¹, Robert Levin, Robert Angelo

¹Lunera Lighting, Redwood City, California, USA.

Journal of Occupational and Environmental Hygiene

|February 16, 2012

Summary

Ultraviolet germicidal irradiation (UVGI) using UV-C light is vital for infection control. A new measurement system enables standardized data for UVGI fixture placement, improving air purification in shared spaces.

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Area of Science:

Infection Control Engineering
Photometry and Radiometry
Environmental Health

Background:

Ultraviolet germicidal irradiation (UVGI) with 254 nm UV-C is a key strategy against airborne pathogens like TB and influenza.
The rise of drug-resistant TB and novel viruses (SARS, H1N1) necessitates effective engineering controls in high-risk environments.
Uniform UV-C distribution in upper rooms is proven effective for air decontamination, but practical fixture placement is hindered by a lack of standardized measurement methods.

Purpose of the Study:

To establish a standard method for measuring and reporting the spatial emission distribution of commercial UVGI fixtures.
To develop a radiometry measurement system for obtaining 3D radiant intensity distributions of UVGI fixtures.
To facilitate the development of user-friendly software for optimal UVGI fixture placement, similar to interior lighting applications.

Main Methods:

Adapted standard photometric methods for general lighting to UVGI fixture data reporting.
Developed a novel radiometry measurement system featuring a Type C goniometer, mirror, radiometer, and computer control.
Acquired 3D spatial emission distribution data for three exemplary UVGI fixtures.

Main Results:

A standardized electronic file format for UVGI fixture photometric data was created.
The developed radiometry system achieved measurement variations within ±2.0% across repeated trials.
The system successfully captured 3D radiant intensity distributions for the tested UVGI fixtures.

Conclusions:

The developed measurement system provides essential data for standardizing UVGI fixture performance evaluation.
This work lays the foundation for software that simplifies the design of effective UVGI air purification systems.
Standardized data and placement tools will enhance the efficacy of UVGI as an infection control strategy in public spaces.