Articles

The authors summarize a UV-LED calibration concept that relies upon radiant flux, and emphasize the advantages for developing measurement standards in the increasingly important UV spectral range. The extremely low measurement uncertainties (k=2) of the UV-ACS are comparably low to those in the metrologically unproblematic visible range, thereby offering a reliable resource for radiant flux calibration in the UV-A, UV-B, and UV-C ranges.

To enhance the feeling of well-being of drivers and passengers in a vehicle, interior displays and control elements should be color-coordinated so that all critical information is quickly and easily recognizable. The quality of optical parameters such as color, brightness, mura, and pixel-detection must therefore be tested at manufacturing stage, enabling decentralized component production. This is only realizable with high-precision light measurement technology in the entire supply chain.

In the mass production of laser diodes such as VCSEL, high-resolution array spectroradiometers are an efficient alternative for in-process inspection in a 24/7 production environment. Compared to established measurement techniques, they also guarantee high throughput volumes and reliability in the industrial environment: their configuration means high mechanical stability and enables integration times in the order of just a few milliseconds for CCD and microseconds for CMOS detectors.

The transition from incandescent light bulbs to (O)LEDs as dominant lighting sources poses new challenges to light measurement. (O)LEDs exhibit completely different and far greater variations in their spectral distribution, for the measurement of which calibrations with standard illuminant A are not optimal. Metrological traceability is thus particularly important for the interpretation of (O)LED measurements.

Although microLED displays are a promising technology, they pose new challenges for metrology. Here, two authors from Instrument Systems show how an imaging light measurement device made of a 150-megapixel RGB sensor and a high-end spectroradiometer can provide faster and more accurate microLED measurements.

In order to maximize the feeling of well-being of the driver and passengers of a vehicle, interior displays and control elements should be color-coordinated, so that all important information is quickly and easily recognizable. The quality of optical parameters must be tested at the manufacturing stage, enabling decentralized component production.

Before an LC display is accepted by an OEM, the quality must be carefully tested according to fixed criteria. Besides know-what and know-how, high-precision optical measuring technology is called for here.

The user must familiarize him- or herself with new values and terms, and expects consistency. That in turn is a challenge for lamp and luminaire manufacturers: How are these quantities correctly measured on a comparable basis?

The current international Standard IEC 62471 contains guidelines for evaluating the photobiological safety of lamps and lamp systems. To ensure reliable evaluation, it places extremely high demands on measuring equipment and procedures.

The display market of the automotive industry is developing at rapid rate. Along with fast technological advancement of infotainment systems, head-up displays, or central controllers, a growing demand for safety, aesthetics and user comfort is evolving. In order to economically benefit from the new challenges in the automotive interior sector, it is crucial for suppliers to have a high success rate in meeting OEM display requirements.

High-resolution array spectroradiometers guarantee high throughput volumes and reliability in industrial environment.

Have you ever wanted to buy an LED lamp, but were confused by the data on the packaging? With a few technical explanations you will know what you need to be aware of.

Instrument Systems addresses increasing demands on light measurement technology in the automotive sector: the goniophotometer AMS 5000 combined with the DSP 200 photometer offers a perfect solution for testing modulated LEDs, which today ensure a driving experience under optimum lighting conditions.

There are two measuring procedures for determining the photometric and colorimetric values of light radiation: One is the integration method based on a photometer or imaging colorimeter. The other one is the spectral resolution method based on a spectroradiometer. Their advantages and disadvantages are detailed discussed in this article.

Today, displays are taken for granted in our everyday lives – unless they fail to function correctly or were falsely specified for an application. How can the quality of a display be objectively assessed, and by which methods and technology can it be analyzed and improved?

The brightness and color reproduction of a flat panel display is factory calibrated. For economic reasons this should take place in an automated process at the production stage. Spectroradiometers enable precise photometric and colorimetric measurements, and are fast enough for use in production.

Modern Solid State Lighting (SSL) technology has long since found its way into our normal working and living environments. In the early phases, consumers were most concerned with lifetime, pricing and light quality of the new LED-based light sources. Now they have become almost ubiquitous, a focus has been placed on safety. At the recent Light+Building exhibition topics such as photobiological safety and blue light hazard (BLH) were highly ranked among both visitors and exhibitors.

In the LED manufacturing process electrical, optical and thermal measurements are performed on the production line itself, to sort the LEDs in quality groups and to separate defective from high-grade production.

Optical measurements in LED mass production must be fast and precise. Various methods can be used in the individual production stages, in order to produce reliable results.

For the third consecutive year, Instrument Systems invited engineers from all industries that deal with light measurement of SSL products and different kinds of displays to their seminar. LED professional’s Editor in Chief, Arno Grabher-Meyer, was also pleased to receive (and accept) an invitation. In this article he shows what attendees can expect, who might find this event of interest, who would benefit the most and who should definitely not miss the next opportunity to attend.

Display metrology is crucial in order to obtain objective characteristics that specify the performance of such displays as a basis for purchasing decisions. The usability of displays for a certain application can be estimated on the basis of performance features obtained from standardized display measurements. In the R&D activities of companies that are manufacturing displays and products with displays, display metrology is necessary to obtain performance specifications for systematic product optimization.