Thread by @masknerd

[1] Accurate germicidal efficacy and photobiological hazard measurement of far-UVC sources.
Mike Clark, Gigahertz Optik GmbH
#ICFUST2023
#ICFUST

[2] Need better meters especially between fluence and irradiance. UV radiomerters - widely used, convenient
UVspectroradiometers - much more comprehensive

[3] Radiometers often calibrated for near radiation. Most commercial radiometers don't cover the range of Far UV-C. Also need to match spectral response to wavelength of interest or big errors. Knowledge of light source used in calibration is very important!

[4] In-situ hazard measurements are very low, so you need a lot of sensitivity, and complex because of spectral distribution. Out of band response can result in overestimate of risk.

[5] IEC 62471:2006 requires a double monochromator system or a system that can be correlated. Most people are using array spectrometers. However internal stray light performance is a limiting factor for UV array-spectroradiometers. Manf. quote these but need to know how measured

[6] Plot showing simulated spectrum error impacts on a ACGIH level type measurements [Can't we just use the 222nm as the reference itself]

[7] UV spectroradiometer requires calibration with a duterium lamp, if using integrating sphere watch out for fluorescence!

[8] Conclusion - Need good cosine response to get total irradiance
Radiometers - Need spectral response to match light of interest
Spectroradiometers - Need calibration light source, and accuracy of wavelength important.