Compare ISO 32543-1 and ISO 32543-3 in the overlap area (50µm to 100µm)

X-Ray NDT Forum � Standards for X-Ray NDT � ISO and CEN � Standards for Focal Spot Measurement for NDT � Compare ISO 32543-1 and ISO 32543-3 in the overlap area (50µm to 100µm)

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#1 | Compare ISO 32543-1 and ISO 32543-3 in the overlap area (50µm to 100µm) datum

Thu Feb 05, 2026 5:12 pm (Last edited: Thu Feb 05, 2026 6:48 pm)

The pinhole method of ISO 32543-1 is for focal spots >100µm. As the method can be used very simple and fast in production there was the question if it also would fit for smaller focal spots.
And what would be the difference to the edge method of ISO 32543-3?
A Kowospot camera was taken and the pinhole element was replaced by a cross hair wire segment:
PinHole&CrossHair_1.png - Bild entfernt (keine Rechte)

The evaluation using Image.3500 from YXLON show similar results to the result of the pinhole image - but the influence of the manual drawing of the line profile and read out may have an influence ...
PinHole&CrossHair_2.png - Bild entfernt (keine Rechte)

Best Regards
Klaus

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#2 | RE: Compare ISO 32543-1 and ISO 32543-3 in the overlap area (50µm to 100µm) datum

Thu Feb 05, 2026 6:30 pm (Last edited: Thu Feb 05, 2026 6:46 pm)

An algorithm was added to the KowoSpot software to evaluate the unsharpness at the eight edges of the two wires.
The evaluation was done in X and Y direction and for a 60µm focal spot the results are comparable using a 800µm tungsten wire set
PinHole&CrossHair_3.png - Bild entfernt (keine Rechte)

Another focal spot with the identical setting is not as good as before:

PinHole&CrossHair_4.png - Bild entfernt (keine Rechte)

The X-direction is nearly perfect but the Y-direction shows major deviations - 126µm compared to 70µm with the pinhole evaluation.

Even using the outdated threshold method which lifts the value of the pinhole evaluation to 100µm still does not fit:

PinHole&CrossHair_5.png - Bild entfernt (keine Rechte)

The reason is well visible in the both images: in X-direction we see somehow sharp edges but in Y-direction the edge is unsharp - which is conform to the result of the evaluation.
The first focal spot seem to have a Gaussian distribution and the second one appears to have a Lorentzian distribution which has a long tail at the end. The ILP method measures the Klassens values from 16% to 84% which reduces the influence of the tails, but the edge method also takes the values from the tail in account.

The two methods of ISO 32543-1 and -3 give different results depended on the statistics of the X-ray photons ...

If you have any idea how to fix this issue please write a posting here

Best Regards
Klaus

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