LED analysers measure colour and intensity of LEDs on charging stations for aircraft cabins

LED analysers from Micro-Epsilon are being used as part of end-of-line test equipment to measure the colour and intensity of red and green status LEDs for charging stations designed for aircraft cabin applications.

Loll Feinmechanik GmbH, a company that develops sockets and USB chargers for aircraft cabins, is using the colorCONTROL MFA-14 multi-point colour measurement system from Micro-Epsilon to measure the colour and intensity directly on the LED display and reliably detects deviations within defined tolerances. This means that even the smallest colour differences can be reliably detected, which can be noticeable in an aircraft cabin environment across entire rows of seats.

The individual colour quality of an LED and its colour temperature are often determined by its ‘bin’. When combining multiple LEDs together, the difference in colour temperature can be quite apparent if LEDs are used from different ‘bins’ and so there is a need to inspect and check that the illumination and colour temperatures are equal.

In the application, the LED status display is objectively checked so that displays appear identical in each unit. MFS fibre optic receiver sensors from Micro-Epsilon are used to check up to 14 LEDs simultaneously and precisely, directly on the status display. Information is directly transmitted from the measured object to the MFA controller via the individual MFS sensors, which are interchangeable and can be universally coupled. Every LED can be reliably evaluated and documented, even in changing designs and confined installation spaces. Units outside the defined tolerances are sorted out, while tested products with consistent colour quality are released.

The LED Analyser records relevant measurands such as colour values in common colour spaces (e.g. XYZ, xyY, Luv, uvl and RGB), the dominant wavelength (λDuomo) for the clear assessment of the main emission content, as well as the colour temperature (CCT). The colorCONTROL MFA-14 is suitable for automated test sequences in series production and evaluates LED displays objectively with reproducible results. This replaces or safeguards the visual inspection and the LED quality can be documented in a standardised manner.

The colorCONTROL MFA series of multi-point colour detection systems is available in either 7, 14, 21 or 28 channel configurations (each with a uniform installation size) to monitor up to 28 LED test objects simultaneously. The MFA-14 offers high data processing/sampling speeds (up to 80 Hz), high repeatability (xy < ± 0.000025) and a wide dynamic range (1 to 50,000 lux).