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Phone: +49 (0)8193-93700-0
info@gigahertz-optik.de

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Phone: +1-978-462-1818
info-us@gigahertz-optik.com

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UV radiation

UV radiation is widely used in many industrial processes, primarily for curing, purification and sterilization. The measurement of high-energy ultraviolet radiation places particular demands on the design and calibration of suitable instrumentation. Gigahertz-Optik GmbH offers a comprehensive product range of instruments and measurement accessories for measuring high energy ultraviolet radiation, a selection of which are presented in the application examples on this page.

Additionally, particular UV measurement solutions are also presented in the following application categories:

LED manufacturing and assembling
Light hazard
Solar radiation
Laser radiation measurements
Photomedicine

+49 (8193) 93 700-0

Irradiance measurement of high-intensity gas discharge lamps for UV curing

Controlling the exposure of work pieces to UV energy is essential in the curing processes widely used for coatings, inks, adhesives, encapsulants and potting compounds. To monitor and adjust the UV energy, the irradiance needs to be measured as close as possible to the surface of the irradiated parts. Successful curing requires the correct dose of UV at the wavelengths appropriate for the particular material. Dose, measured in J/cm², is the product of UV intensity and time of exposure (W/cm² x seconds). UV intensity (irradiance) is measured by a UV radiometer in W/cm², but may also be displayed directly as a dose in J/cm². A suitable radiometer must also be able to withstand a high temperature environment.

Reduced measurement uncertainty for UV radiometers

UV radiometers do not come in ‘one size fits all’ format. They may be required to have a flat spectral response over specific spectral bands (e.g. UV-A, UV-B and UV-C) or to match particular actinic spectral functions (e.g. ICNIRP or erythema). UV radiometers are typically constructed from a photo-detector and filter combination, often with an entrance optic such as a cosine diffuser.
What is common to all filter-corrected radiometer designs is that their spectral responsivity function will never perfectly match the target specification and further production-related tolerances will also arise. These inevitable spectral mismatches introduce measurement uncertainties. Their magnitude depends not only on the deviations of the spectral responsivities, but also on the relative spectral power distribution of the radiation source being measured. The technical report CIE 220: 2016 [1] presents a methodology for determining the expected measurement uncertainty due to spectral mismatch.

Irradiance measurement of UV LED curing equipment

UV LED lamps are being enthusiastically developed and adopted as alternatives to the medium pressure mercury lamps traditionally used for UV curing processes. UV LED curing offers several potential advantages including reduced power consumption, less heat generation, instant switching, longer lifetimes, as well as the environmental benefit of being mercury-free. UV radiometers are widely used to monitor and control the UV exposure (or ‘dose’) from high-intensity gas discharge lamps on work surfaces. However, UV LED devices emit a narrow spectrum of radiation (typically ±10 nm), whereas mercury lamps have a much broader spectral distribution. This has significant implications for the design and calibration of radiometers if they are to be suitable for measuring the irradiance of UV LED curing equipment.
The UV radiometers produced by Gigahertz-Optik GmbH generally have a broadband spectral responsivity function resulting from the combined characteristics of the photo-detector and filter.

App. 021