© REA Elektronik GmbH, Teichwiesenstraße 1 D-64367 Muehltal
REA VeriCube Operating Manual Version 2.16 – 11/2020
Page 19 of 119
For the reflectance adjustment the blue component of the UV-LED light is used,
which is within the sensitivity range of the camera. An absolute reference to national
standards is not established in this case, but only a reference to the reflectance
values measured with red light as a reference. This adjustment is used to obtain
repeatable, stable measurement results that refer to a defined standard.
The typical measurement objects are markings with dyes / inks / printing colors that
are invisible or completely transparent in visible light. In UV light, these markings
generate fluorescence in the visible range of the light spectrum. This light, which is
generated by fluorescence is evaluated as if it were a reflected light from the surface.
Due to the adjustment, described above, the UV light source has an always identical
intensity. Thus, the fluorescence is evaluated with stable lighting values. The
evaluation must be in accordance with ISO/IEC TR 29158 (DPM).
Attention:
The focusing plane of the camera module in UV is shifted in relation to
that in red light. If the REA VeriCube UV is to be used for measurements
with red light, it is essential that a suitable camera module is then used
for red light.
