Whitepaper

Instrument Systems presents its latest goniometers of the DMS series: the fully automated 7-axis DMS 904 goniometer was designed specifically for the optical characterization of large and curved displays. This also includes pillar-to-pillar displays that extend over the entire width of the vehicle.

In light measurement technology, there are hardly any limits to the variety of measurements and measurands. The realization of the measurement setup also plays an important role for the correct interpretation of measurement results, as it has a significant impact on the error budget. When are measurement results precise, accurate or even absolute?

Vertical-cavity surface-emitting lasers (VCSELs) perfectly fulfil the requirements for present and future 3D sensing applications. However, to operate VCSEL-based devices in public, the manufacturer must assure safe operation compliant with the IEC 60825-1 standard or national equivalents. As VCSELs exhibit special emission characteristics that differ from other laser sources, the safety assessment is more complex and a practical guideline does not exist. In this paper we explain the differences of VCSELs as compared to “normal” collimated, Gaussian lasers, and outline the main steps necessary for VCSEL safety assessment.

This report outlines a selection of main OEM display requirements, how test parameters can be experimentally verified and to discuss what to expect in regards of time efficiency for EOL solutions. With the colorimeter LumiTop in combination with a CAS spectroradiometer we achieve a testing time of main assessment parameters, such as color, uniformity, gamma, and dot defects of less than 15 s per display total. The presented work grants way to a fast and successful production testing and therefore helps members of the OEM supply chain to access profitable business opportunities within the German automotive market.

The white paper at hand presents main challenges in the measurement of UV radiation in the context of UV LEDs. The focus is on the comparison of integrating spheres (ISP) with barium sulfate (BaSO4) reflective coating (typically used for VIS and IR applications) and polytetrafluoroethylene (PTFE) reflective material for the measurement of radiant power in the spectral range between 200 and 400 nm.