Markets & applications for UV radiation and optical measurement

In research and production, optical radiation is three things at once: a tool, a process variable and a test variable. It drives chemical reactions, inactivates micro-organisms, cross-links polymers, ages materials under controlled conditions and stimulates biological systems. In nearly every case the engineering question is the same: which spectral radiation actually reaches the sample, how evenly is it distributed, and for how long?

The fields are ordered by the job the radiation does in them, not by product group. Where a piece of work belongs in more than one field, it is linked from both.

Environment & energy
Here radiation drives a chemical conversion.

• Photocatalysis – spectral irradiance and photon flux at the catalyst
• Water and environmental technology – transmittance, matrix and residence time in the medium
• Photocatalytic hydrogen production – photon flux as part of the efficiency definition
• Photovoltaics and solar simulation – spectral match, uniformity and stability of the source

Life sciences
Here radiation meets living systems, whether intended or damaging.

• UV disinfection – fluence and organism-specific dose-response curves
• Photobiology and biotechnology – action spectra and weighted measurement
• Plants, agriculture and food technology – the window between stimulus and damage
• Pharma and photostability – separate UVA and visible-light exposure under ICH Q1B
• Medicine and phototherapy – dose at the treatment plane with a steep action function

Industry & manufacturing
Here radiation is a production step with a cycle time and a release criterion.

• UV curing and photopolymerization – spectrum, dose rate and oxygen at the surface
• Additive manufacturing and 3D printing – exposure, post-curing and shading on the part
• UV bonding, potting and encapsulation – the joined part in the beam path acts as an optical filter
• Electronics and semiconductor manufacturing – cleaning, activation and encapsulation in the back end
• Packaging and filling technology – the dose at the worst-case point of the product within the cycle time
• Optics and precision components – cleaning without contact, measuring with a defined geometry
• UV measurement for industrial printing – dose profile on fast production lines
• Surface cleaning and surface activation – photochemical removal of organic residues

Testing & qualification
Here radiation is the test variable, not the tool.

• UV ageing, colour fastness and photostability – acceleration is not equivalence
• Fluorescent penetrant testing and industrial inspection – excitation, field uniformity and ambient light
• Laser processes and transmission testing – transmittance at the processing wavelength
• Occupational safety and photobiological safety – weighted assessment at a realistic measuring geometry

Cross-cutting
These two fields cut across the others.

• Automation and process integration – the path from the reading to process release
• Lighting technology, LED and display technology – photometric or radiometric – two ways of evaluating the same radiation

UV technology is rarely a market of its own. More often it is an enabling technology inside larger production, research and testing systems. For scale: in its Global Industry Report, SPIE put revenue from core photonics components in 2024 at roughly 379 billion US dollars. The individual UV segments – curing, disinfection, measurement – are two to three orders of magnitude smaller.

Technologically the emphasis is shifting away from picking a lamp towards integrated optical processes. UV LEDs offer narrow spectra, fast switching and locally confined energy input. Discharge lamps remain relevant wherever high power, broad spectra or established process windows are required. Alongside them, spectral measurement, inline sensors, digital interfaces and automated dose control keep gaining ground. The primary engineering figure is no longer the electrical rating of the source but the spectral radiation arriving at the point of process.

How optical measurement and UV irradiation are used in real research questions is best shown by the work of users. Each market page carries a small annotated selection; the complete lists, ordered by product and by topic, are collected under publications by customers and publications by topic.

A single study often belongs to more than one field, and that is intentional. Photocatalytic removal of a pharmaceutical from water sits with photocatalysis on the mechanism side and with water and environmental technology on the application side. Photocatalysis names a mechanism, water technology names an application – the two do not exclude each other.