Current Lectures – Our Experts Live

"The race toward Rec2020 and HDRI – OLED vs. LC display technology"
Dr. Michael Becker
Thursday, 28 February 2019, Session 08, 11:20 -11:40

Abstract: Dr. Becker presents measurement results for state-of-the-art OLED and LC-display screens characterizing the stability of chromaticity and luminance with respect to viewing direction and electrical driving. Data concerning the reflective properties of both display technologies as a basis for comparison of display performance under ambient illumination are also shown. The obstacles that have to be overcome for realization of Rec. 2020 and HDRI are introduced and discussed for both OLED and LC-displays.

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"How Safe is Your Lighting Environment? An Evaluation Guide for Blue Light Hazard"
Dr. Ðenan Konjhodžić
Thursday, February 28th 2019, 13:45 - 14:15, Room: Oceanside, SiL 2019, Las Vegas, USA

Abstract: The rapidly growing significance of modern solid state lighting (SSL) technology in our daily working and living environment raises important safety issues, such as the blue light hazard (BLH). The original IEC 62471 standard places high demands on measurement equipment and procedures for the reliable assessment of the BLH risk classes of light sources. Additionally, the IEC Technical Report 62778 explains how to apply the IEC 62741 for simple assessment of the BLH of lamps and luminaires with visible radiation. However, this has not yet become a standard. Currently, worldwide efforts are underway to elevate this report to a new standard and add more detailed measurement procedures for BLH assessment that are accessible to a broader community. We will evaluate and compare these methods using some practical measurements, and emphasize the advantages and disadvantages of each method. Every manufacturer should perform BLH assessment for the permission of new SLL products.

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"High Resolution Array Spectroradiometer for High Volume Laser Diode and VCSEL Testing"
Dr. Tobias Roesener
November 12-13 2018, 5th International WORKshop on Infrared Technologies, Munich, Germany

Abstract: Laser diodes and particularly vertical-cavity surface-emitting lasers (VCSELs) experience an enormous market growth due to new applications and new technological approaches, e.g. infrared VCSELs are integrated in consumer electronics and direct diode lasers based on VCSEL arrays replace conventional laser systems. A high volume production due to the growing demand for laser diodes calls for fast and accurate production testing. Particularly VCSELs – in contrast to edge-emitting lasers (EEL) – allow additional testing on wafer level before singularizing because the laser cavity is already monolithically integrated in the epitaxial structure. Key measurement parameters are the peak wavelength and power of the devices. Established measurement technologies for laser diodes such as dispersive scanning spectrometry and Fourier-transform infrared spectroscopy (FTIR) allow very high spectral resolutions in combination with a high flexibility with respect to the spectral range under investigation. These properties result from a rotating mirror (scanning spectrometer) and a moving mirror (FTIR) and make these measurement systems very effective for product development and product specification in a laboratory environment ...

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"Workshop - Solid-State Lighting Measurements"
Dr. Ðenan Konjhodžić
Thursday, September 27th 2018, 13 - 14:30, Seefoyer, LpS 2018, Bregenz, Austria

Abstract: The workshop covers the basics of test and measurements of solid-state lighting (SSL) products and is suitable for beginners as well as experts in the field. To provide the same level of knowledge for all participants, an introduction to SSL metrology and the relevant standards such as the first international SSL standard CIE S025 are given in the beginning. Basic quantities and principles in photometry and colorimetry will be defined and proper equipment for their determination will be presented. Important aspects for color characterization, such as correlated color temperature (CCT) and color rendering index (CRI) will be included as well. Participants will learn how to evaluate the optical performance of LEDs as basic components of SSL sources.  Afterwards, the most essential measurement procedures and used instrumentation in SSL measurements will be introduced with focus on goniophotometers and integrating spheres. Goniophotometric measurements provide details of the radiation patterns for different light sources and when correctly integrated, the total luminous flux is obtained ...

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„LED-Messtechnik für das Physik-Praktikum“
Maximilian Mayer
Thursday, September 27th 2018, between 10-15, 44. Praktikumsleitertagung 2018, University of Paderborn, Germany

Praktikumsleitertagung 2018



„Comprehensive Display Measurement“
Kevin Lange (Konica Minolta Sensing Americas Inc.) on behalf of Instrument Systems
Wednesday 26. September 2018, 9:10–9:30am, SID Vehicle Displays and Interfaces, Livonia, USA

Vehicle Displays Detroit - 25th Annual Symposium & Expo



„Streulichtkorrektur für Array-Spektralradiometer“
Dr. Ðenan Konjhodžić
Tuesday, September 11th 2018, 11.50, Licht 2018, Davos, Switzerland

Abstract: Die wichtigste Einschränkung der Leistungsfähigkeit eines Array-Spektralradiometers in der Photometrie und Radiometrie ist das Auftreten von Streulicht. Dies bedeutet, dass ein bestimmtes Element des Array-Detektors durch Strahlung von einem anderen Spektralbereich als des angegebenen kontaminiert wird. In diesem Referat werden die Möglichkeiten der Streulichtkorrektur für Array- Spekralradiometer mit Hilfe von durchstimmbaren Laserquellen vorgestellt. Die Vorteile der Anwendung einer so bestimmten Streulichtmatrix bei verschiedenen Messungen werden hervorgehoben. Das Streulicht kann um etwa eine Größenordnung unterdrückt werden, wodurch insbesondere im UV-Bereich eine genauere Kalibrierung erzielt wird. Auch bei den sichtbaren LEDs wird eine genauere Bestimmung der Farbkoordinaten erreicht.

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„LED- und Displaymesstechnik“
Dr. Tobias Roesener
Thursday, September 13th 2018, optence, Task force LED Technology, Darmstadt, Germany

optence - Networking in photonics

In the field of optical technologies Germany has numerous small and medium-sized companies, global players with first-rate innovative potential and high-profile research institutes. To boost innovative capacity and international competitiveness, networking and pooling of resources are becoming increasingly important. For many years Optence e.V. has been active as a regional innovation network for optical technologies. It forms a link between industry and research.