Light measurement, as required for the development and production of modulated LEDs, must satisfy specific requirements. Automotive lighting, for example, has normal modulation frequencies of only a few hundred Hertz. An LED that is dimmed to half brightness is thus switched off for half the time for several milliseconds. If the light source remains stationary, the luminous intensity can be simply determined by the formation of a mean value. However, in order to save measuring time the light distribution is mostly “on-the-fly” scanned in motion. With the goniophotometer AMS 5000 by Instrument Systems the speed of movement can reach up to 50° /s. Thus, there are measuring segments in the range of one tenth of a degree where the LED is not illuminated. Nevertheless the luminous intensity should be determined also at these positions.
The modulation frequency of the LED to be measured is often not known, not influenceable and not necessarily synchronous with the selected spatial screening grid. For this reason, Instrument Systems has developed an extremely fast photometer, the DSP 200. It combines a high-speed analogue amplifier and digital signal processing. Adaptive filters ensure the highly accurate measurement of modulated LEDs even without knowledge of their signal form. The signal processing within the DSP 200 is software-based, providing a remote update at any time and enabling adaptation to future, hitherto unknown signal forms and light technologies.
Instrument Systems focuses its know-how to develop innovative light measurement devices and systems specially geared to the demands of automotive light technology. Our instruments guarantee a high quality and accurate evaluation and qualification of LEDs in the automotive sector.
For more information, please visit www.instrumentsystems.de/produkte/landingams/ or contatc by phone at +49-89-454943-0 or by email at sales@instrumentsystems.com
About Instrument Systems GmbH
Instrument Systems GmbH develops, manufactures and markets turnkey solutions for light measurement. Its main products are array spectrometers, imaging photometers and colorimeters. Key applications are LED/SSL and display measurement, as well as spectroradiometry and photometry. Products of the Optronik line for the automotive industry and traffic technology are developed at the Berlin facility. Since 2012 Instrument Systems has been a wholly owned subsidiary of the Konica Minolta Group. – www.instrumentsystems.com
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