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The Automatic Filter Analysis System of JOMESA:
Cleanliness Analysis, Measurement Process, The patented Metal-Nonmetal recognition, Evaluation Samples, Oil Cleanliness

JOMESA HFD: Measurement Process

This website shows the steps performed in an automatic filter evaluation.
When reading this explanation page, you may understand why JOMESA has achieved to be and maintains to be market leader in filter analysis.

Microcopic analysis starts with the filtermembrane, which has to be placed somehow onto the analyzing system.
During our long experience with filter analysis (since 2001) JOMESA has improved and refined all filterholders.
All these filterholders are manufactured inhouse and our construction can cope also with nonstandard (e.g. oversized) filtertype requirements.








Filterholder with glass cover:
Analyzing and only electronic archiving

Filter-mounts:
Analyzing, electronic archiving and physical archiving

Drum stretch filterholder:

Analyzing, electronic archiving and postprocessing (REM/EDX)









After placing the filtermembrane onto the analyzing system:
The measurement instruction has to be selected.
Then the filter identification data have to be entered into a database sheet.
Then the the automatic processing has to be started.
As required by ISO 16232 the filter is scanned by a motorized scanning stage.





JOMESA has 2 outstanding features in the scanning process.

1: The individual images are composed into a complete membrane image. This image is stored in a database, which is effectively an electronic archive of the filter. This filter can be evaluated at any later time (e.g. if specification change requires a re-evaluation of the scan). Thus our system is not a “black box“ emitting results, but all results can be traced and checked at any time.

2: JOMESA is the only system which is capable of evaluation an exact circle area (red circle left).
This exact method is superior to an evaluation where only total field of views (white rectangles on the left) contribute to the evaluation.

Scanning the filtermembrane

Composing into a complete membrane image





After the motorized scanning and storing the filtermembrane image, the evaluation starts.
The first step in evaluation is an unmatched JOMESA operation (brightness equalization), which ensures that the filter background has equal brightness on every postition.

This unique JOMESA feature implies:
1: Even such heavy inhomogeneous filter like the one shown left, can be evaluated without problems.
2: Because every filter itself and also of course all filters have the same homogeneous background brightness, the brightness threshold for particle detection can be the same for all filters.

The enormous consequence from this is, that all users can work with the same settings for all filters. Thus the evaluation result is completely user independent.


If we would stop at this point, the result would be a particle distribution (size and numbers of particles on the filter).

However optical microscopy allows to draw out further information:
By employing a combination of polarized light (JOMESA Patent), one can discriminate between metallic and nonmetallic particles.
This is on the next explanation page: The patented Metal-Nonmetal Recognition.