Gigahertz-Optik will be presenting some of its innovative light measurement solutions at this year’s Light + Building including the MSC15 and BTS256-EF spectral light and flicker meters as well as the versatile CSS-45 spectral sensor configured for Human Centric Lighting performance verification..
The European ecodesign Regulation (EU) 2019/2020 imposes strict requirements for flicker and stroboscopic effect. The metrics specified are PstLM short-term flicker severity and SVM stroboscopic visibility measure. Both these metrics are conveniently measured by the BTS256-EF meter and its software. With the addition of the LPS-CH-500 signal generator and software, the BTS256-EF performs the EMC electromagnetic immunity tests required by IEC TR 61547-1:2017.
The melanopic stimulus metric together with the spectral composition of lighting are fundamental to understanding in the field of Human Centric Lighting. These measures are provided by all of the spectral light meters from Gigahertz-Optik including the popular MSC15. Additionally, the BTS256-EF reports all the metrics to characterize the non-visual stimulus of light as defined by CIE publication S026:2018. A system incorporating two CSS-45 spectral sensors provides direct assessment against emerging standards such as the “WELL Building Standard” with regard to non-visual requirements of lighting.
Visit us in Hall 8.0, Booth H50 on the Berghof Fluoroplastic Technology GmbH stand. Gigahertz-Optik is part of the Berghof Group.
An informative presentation explaining stray light as a significant error source in UV array spectroradiometers and minimization correction methods was presented by Mike Clark of Gigahertz-Optik GmbH at the recent UV LED Technologies & Applications Conference (ICULTA) in Berlin, Germany.
Topics included definitions/illustrations of an array type and double monochromator spectroradiometer, stray light, its causes and significance for UV measurement, suppression techniques through optical design, mathematical correction based on signal distribution function (SDF) characterization matrix using a tunable laser, and long pass plus bandpass filtering with associated limitations. The implementation of stray light suppression techniques into the spectroradiometer, subsequent characterization, actual on-site testing and consequences for UV LED measurement were also main topics.
The limiting factor for the use of array-based spectroradiometers in the UV spectral region has been their inadequate stray light suppression. Therefore, many UV applications could previously only be implemented with double monochromators. Such systems are inconveniently large and slow due to their mechanical scanning. Typically, they require complex installation and operation.
The innovative BTS2048-UV-S instrument series is able to demonstrate the necessary quality for UV spectroradiometry thanks to its filter-based scattered light suppression of several orders of magnitude and its DAkkS traceable calibration.
Additionally, it offers much shorter measurement times (a few seconds compared to many minutes), lower energy consumption, a considerably smaller design and a weather-proof enclosure for field applications.
The system is well suited for solar UV and ozone measurements, for instance. Other typical applications include radiation risk assessment in occupational safety and the measurement of UV LEDs.