Methodology - TechTest RECOGNOIL User Manual

NOTE
Please do not use paper towels or cloth containing industrial bleachers for manual
degreasing, as they can influence the result values.
Bleacher can be transferred to the object's surface when using solvents. Since the
bleachers present a very high fluorescence activity, the result values of the Recognoil
detection may be much bigger than the actual amount of oily residues on the surface.
5.2.

Methodology

Detection of grease residues with the Recognoil device on objects of different
shapes and sizes
This section has been written for the reason of two basic existing limitations of the
Recognoil device. First – the need of exact distance of the object and the Recognoil detector
head, second – the need of 100% light out-screening. The Recognoil device is primarily
designed for planar objects of bigger dimensions, but, with the help of this manual, the
number of possible applications can be made considerably greater.
1. Objects with planar surface with dimensions greater than 100x50 mm
E.g. sheet metal, ALU profiles, etc.
Detection may be performed directly by putting the detector head to the surface.
Note 1: Even though the detection itself is called non-destructive, it is to be remembered,
that the Recognoil device touches the surface with a rubber profile, ensuring that no light
can get inside the detector head. If this rubber profile has been contaminated by touching
a highly polluted surface, it will hand over the residues to a surface, which is cleaner,
causing unwanted contamination. Please remember, that this may damage the sample in a
way that it cannot be used in the production any further and must be degreased again. For
this purposes it is recommended to use multiple "detector head protectors" – one for the
"polluted" surface, one for the "supposed-clean" surfaces.
Note 2: Due to undesirable reflections of the UV radiation directly to the main detector
aperture, there may, in case of low oil film and in case of high contrast amplification,
emerge unwanted elongated shapes, which do not denote elevated oil film thickness, but
the undesirable UV reflection. For this reason, we recommend to perform these detections
in a "cross-align" or "diagonal-align" way to minimize the influence of these effects. Please
see the Appendix of this document.
2. Objects with planar surface with dimensions smaller than 100x50 mm
E.g. sheet metal samples, cutoffs, etc.
Again, the detection may be performed directly, but the sample must be placed on an
appropriate clean metal surface that it does not influence the detection outcomes. The
unwanted background surface can be neglected by selecting the appropriate surface in the
software. As the underlying object it is recommended to use a black anodic oxidized
aluminum sheet metal due to its low reflectivity and high absorption. In case of higher
Recognoil – User's Manual
Software version 2.2.1_2015-02-21
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