Articles

With the publication of Technical Report CIE 250:2022 Spectroradiometric Measurements of Optical Radiation Sources, the CIE has issued a contemporary document on the fundamentals of spectroradiometry, thereby discharging its predecessor CIE 063:1984 into well-earned retirement after 38 years of effective service.

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.

Variable testing of the overall ADB lighting system with the highest precision in a standard-compliant, realistic situation in the field.

Novel one-shot method enables the full performance efficiency of the VCSELs to be exploited while assuring safe operation.

Novel display technologies, such as near-eye and microLED displays, enable exciting new user experiences. However, they also impose big challenges for quality control, especially with substantial production tolerances and spectral variances of light sources.

The promising germicidal effect of UV-C radiation, also on the coronavirus, raises the question of the reliable measurement of UV radiation. However, this complex task needs expertise and the appropriate equipment.

AMS screen imaging system allows ultra-fast determination of light distributions for HD / ADB / matrix / pixel vehicle headlamps.

Vertical cavity surface-emitting lasers (VCSEL) are getting more and more popular for 3D sensing and time-of-flight technology in consumer and automotive applications. VCSEL arrays with hundreds of single emitters are often used. Measurement of the radiant intensity distribution is the key to performing a proper eye safety assessment and designing suitable secondary optics for

these emitters.

Das UV-Spektrum ist während der Corona-Pandemie in den Fokus gerückt. Bisher existierte kein Referenzstandard für die Strahlungsleistung. Jetzt gibt es einen Kalibrierstandard für UV-LEDs.

The rapidly emerging dominance of OLED technology for illumination and display applications is driving demand for a metrology tailored to these light sources.

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.