JOMESA Meßsysteme GmbH
Cleanliness Analysis
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The JOMESA system for cleanliness analysis

Why we use reflecting light illumination ?

For detecting and counting residue particles two optical illumination techniques are applicable:
In transmitted light illumation technique the filter membrane is illuminated from below, in reflexion technique the illumination is from above.

JOMESA uses reflecting light to detect particles:

· to analyze material information (metallic particles vs. nonmetallic particles)  automatically
· to be able to document color information
· to be independent of type and structure of filtermembranes

Typical reflection light image without polarization technique.T

Color differences and metallic reflecting particles can be optical identified.

 

Typical reflecting light image with suppressed metallic reflexions by polarization techniques. Color differences are not touched by this technique. 

JOMESA uses a combination of images with and without metallic reflexions to determine the physical nature of the particles.

 
Typical transmittel light image:
In general no color or metallic nature information is visible. Only the size of the particles can be evaluated.

Effects of filterstructure in different illumination situations:

100µm mesh of polyester filtermembrane

Reflecting light image without polarization filters

Image recorded with the JOMESA-System.

 

Reflection illumination image with suppressed metallic reflections.

Image recorded with the JOMESA-System.

 

Transmitted light illumination image.

Mesh filters or thick cellulose filters may disturb the evaluation in transmitted light technique.

Image recorded with material microscope at 5-fold magnification objective.

 

 

Detection of metallic particles:

Metallic particle recorded without polarisation Result of particle evaluation without polarisation
Image of a metallic particle without polarisation device.

There appear corridores  within the particle having similar lightness  as the background.		 When analysing the particle by automatic algorithme there is the danger that the particle is cut into seveal pieces and therefore counted falsely.
Metallic particle recorded with polarisation

Same particle illuminated with polarisation equipment.

Advantage: The particle will be detected always in full size.

Disadvantage: The metallic appearance is lost.

JOMESA uses a combination of images with and without metallic reflexions to determine the physical nature of the particles.

JOMESA Meßsysteme GmbH

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Cleanliness Analysis

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