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For the absolute quantitative characterisation of UV/VIS and NIR radiation sources spectroradiometers from Instrument Systems (CAS 140CT UV/VIS, Spectro 320) and external optical probes with different reception characteristics are available. Hereby, the spectral irradiance and illuminance of both point-like and extended emitters can be determined. In addition, the development of project-specific sensors for radio- and photometric quantities is carried out.

Application field: Characterisation of dermatological UVB excimer lamps

In the BMBF project “Research on high-performance, planar excimer UV plasma sources with electrodeless energy coupling for dermatology” Xe/Cl excimer lamps with different gas fillings were characterized spectroradiometrically. The goal was the realisation of a nearly monochromatic surface emitter with maximum irradiance in the wavelength range from 300 to 315 nm. Such radiators are optimally effective in a psoriasis phototherapy. However, the knowledge of the irradiance is very important for the correct dosage of the UVB radiation. The spectrum of the optimized radiator is shown on the right. In the UVB spectral range an irradiance of 25 mW/cm2 was reached.

Application field: Luminance coefficients of asphalt surfacings

Bright asphalt layers in road construction are of particular importance because they enable a cost-effective street lighting, improve road safety and enhance the deformation resistance of the driving surface. For the photometrical characterization of the roadway brightness that is perceived by a car driver the average luminance coefficient is commonly used. Within the frame of a ZIM cooperation project a mobile measurement method that allows the determination of the average luminance coefficient directly on the road has been developed. Thus, the picking up of drill cores from the road, that are often not representative for the entire road, becomes unnecessary.

Project example: Characterization of long-wavelength, planar infrared radiant heaters for indoor use

The infrared radiant heater is a heating device, that enables a space heating predominantly by means of infrared radiation. Walls, persons and objects are warmed-up due to he absorption of infrared radiation. The ambient air heats up only secondarily. Thus an air circulation is largely suppressed and warm air does not accumulate on the ceiling, where it is not needed. We analyzed planar electric glass radiators with a surface temperature of up to 100 °C. The heater’s temperature has been measured simultaneously at different positions using eight accurate Pt-100 sensors. The emitted radiant powers were then determined by applying Stefan-Boltzmann‘s law. Depending on the radiator‘s geometry and its position in space, electro-optical radiation efficiencies of 75-83% habe been demonstrated. Moreover, the cost-effectiveness of the devices can be further increased when an optionally insertable paraffin-based latent-heat storage system is used and electrically loaded in a low tariff period.

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