TS EN 14255-4

TS EN 14255-4 is a terminology standard for the quantities used in personal exposure measurements of incoherent optical radiation. It provides a common vocabulary for assessing exposure in the UV, visible and IR ranges and aligns the measurement concepts used in EN 14255 parts 1, 2 and 3.

Why unified measurement terms matter

In optical radiation work, the same physical quantity can appear under different names or with slightly different definitions across publications from different origins. The main purpose of this standard is to reduce those inconsistencies and harmonize the terms used for measurement and assessment. That makes reporting, interpretation and technical communication more consistent for ultraviolet, visible and infrared exposure.

Where it fits in practice

• It is tied to the UV, visible and IR exposure measurements covered by EN 14255 parts 1, 2 and 3.
• It addresses the terminology and quantities used in personal exposure assessment.
• It can also be applied to related terminology in international recommendations.
• It is relevant for aligning concepts used in sources such as ICNIRP and CIE.

From a general technical perspective, UV, visible and IR radiation occupy different wavelength regions and may require different measurement approaches when exposure is assessed. Clear definitions of quantities such as irradiance, exposure and related optical radiation metrics are essential to ensure that a measured value is understood correctly. TS EN 14255-4 supports that conceptual framework by standardizing the terminology behind the measurements.

This document is focused on the language and quantities used in measurement rather than on a measurement method or a limit value. As a result, it serves as a reference point for consistent terminology in laboratories, technical reports and publications that deal with optical radiation exposure.