appareil UV

Radiometric measurements in the UV

Ultraviolet (UV) radiation is included in the part of the light spectrum ranging from 200nm to 380nm. They are more energetic than the radiation emitted in the visible. Also, depending on the wavelength used, their applications can be very varied: disinfection, polymerization, tanning … However, these rays are dangerous for the human body and can deteriorate materials. It is therefore necessary to have a good … Continue reading Radiometric measurements in the UV

Décomposition couleur mesure photométrie colorimétrie

Photometric and colorimetric measurements

The objective of photometry and colorimetry measurements is to characterize the performance of light sources and lighting systems: LEDs, lamps, luminaires, motor vehicle lights, screens, indicators, panels …PISEO has skills and equipment to provide you with objective, impartial and quality measurement results. Thereby, these results allow you to check the performance of your products in accordance with regulatory requirements, as well as to stress their … Continue reading Photometric and colorimetric measurements

Mesures thermiques sur le système optique LED

Thermal measurements

The performance of LED based illumination systems (lamps, modules, luminaires) depends strongly on LEDs thermal management. A junction temperature (area of the semiconductor from which the light is emitted) too high can generate:  a significant reduction in product lifetime (up to 50% at 10 ° C) a significant loss of luminous flux a reduced energy efficiency a drift of spectral distribution therefore colorimetric coordinates aging (yellowing) of the … Continue reading Thermal measurements

mesure analyse flicker

Optical flicker and SVM measurement

Optical flicker is a phenomenon of variation of the light emitted by the light source of a lighting device. It can cause visual discomfort for users, or even more severe disorders (epileptic seizures) for the most sensitive subjects. It is dependent on the variation of the power supply, voluntary or involuntary. When unintentional, this variation is indicative of poor product design. Likewise, the strobe effect … Continue reading Optical flicker and SVM measurement

Characterization of phosphorescent devices

Phosphorescent materials have the particularity of emitting light during a period of time which depends on their nature and duration of exposure to light radiation. PISEO has test facilities to characterize the luminance, its decreasing over time, the persistence time, the spectral composition and the color of products incorporating phosphorescent materials (textiles, paints, concretes …). These characterizations allow PISEO’s customers to know precisely the performance … Continue reading Characterization of phosphorescent devices

Benchmarks of LED, image sensors and finished products

We independently carry out benchmarks of performance and product quality. Objectives The product comparison programs make it possible to know the performance of the products analyzed in a precise and objective way and to compare them. These programs are based on IEC performance standards and PISEO competencies. They are particularly suited to the distribution market. Analyzed parameters Photometry and colorimetry Energetic efficiency Efficiency class Power … Continue reading Benchmarks of LED, image sensors and finished products

Evaluation du risque photobiologique

Photobiological risk evaluation EN62471

The photobiological risk assessment (EN62471 and IEC TR 62778) is one of the mandatory provisions imposed by the European Commission to ensure the safety of products and people. Manufacturers and marketers of products incorporating LED type light sources must comply with the applicable standards: EN62471 and IEC TR 62778. Its obligations are part of the CE marking, in particular in the context of compliance with … Continue reading Photobiological risk evaluation EN62471

OLED Displays

Characterization of displays and luminous surfaces

Displays and luminous surfaces (illuminated signs, backlit keyboards, pictograms, luminous buttons, phosphorescent markings, signage…) possess measurable photometric and colorimetric characteristics. The ability to characterize these luminous devices by means of the appropriate equipment allows objective quantification of their visual performance and verification of their regulatory compliance. PISEO has first-rate skills and equipment to provide objective, impartial and quality measurement results for your screens and luminous … Continue reading Characterization of displays and luminous surfaces

faillure systems

Failure analysis of systems

Optical systems can integrate many electronic and optical components which can be sources of breakdowns when they are poorly adapted to the conditions of use or poorly integrated. With their skills and technical means, PISEO experts are able to identify the root causes of system failures and propose solutions to improve their reliability. Root cause analysis methodology Visual observation of faults, reproduction of faults. Disassembly … Continue reading Failure analysis of systems