This light emission is almost invisible (black light), but when it illuminates an object the result can be very different depending on the nature of the object: illuminating certain materials with UV radiation causes the emission of visible light, causing these substances to glow with various colors.
More recently with the advent of the UV-A leds, this feature has started to be used also in the artificial vision sector in the following industrial application areas:
Material recognition in the sorting sector (plastic, glass, ceramic, etc…);
Reading of barcodes printed with ultraviolet paint;
Defects detection on products encapsulated by transparent plastic;
Silicone or glue presence indication in the assembly processes;
Detection of defects in food products (meat, fruit and seed);
Detection of impurities and liquid levels.
For this reason Genesi has developed the UV-A version for many products
Depending on the type of material and sensors used, there is a different visual response
The manufacturer of the inks that react to UV-A, often does not declare the optimal wavelength
The UV-A leds have a very narrow bandwidth (from 9 to 15 nm) and the materials or the pigments have a sensibility that changes a lot with the variation of the wavelength.
For this reason, it has been realised a new handy KIT that allows to identify which is the best solution in terms of wavelength and type of UV lighting.
It has also been included a white led light in the KIT, useful as comparison during the evaluation tests.