AZtec Tru-I, the EBSD indexing engine, ensures that users collect the best quality patterns and can solve them accurately, reliably and automatically. Pattern collection and solving are performed in real-time.
In this section:
Collect the high quality patterns which are essential to obtaining accurate EBSD data.
AZtec has an optimised system design, for the collection of excellent patterns, even at high speeds or high binning
The signal strength and noise are quantified and can be used as a measure of pattern quality
Dynamic background correction enables pattern by pattern contrast optimisation.
Excellent quality patterns can be achieved from all materials
includes multiphase materials, where the phases can have significantly different atomic numbers
Dynamic background correction automatically masks screen imperfections
Intelligent band detection
AZtec implements an intelligent band detection routine that determines which of the detected bands should be used in the indexing.
Intelligent band detection uses both the average intensity of the band and its position in the area of interest
Improves the percentage of correctly indexed points, especially for materials exhibiting indistinct bands or where pattern quality is low
Magnetic Field Correction solves distorted patterns
In some applications, high magnetic fields from the SEM lenses distort the electron backscattered diffraction patterns. This distortion curves the Kikuchi bands and shifts the pattern centre, but can be corrected automatically using AZtec.
The correction straightens the bands and corrects the pattern centre so patterns can be correctly solved
A dipole correction described in Oxford Instruments’ US patent 7442930B2 is applied
The EBSD indexing routine is critical in achieving accurate results - AZtec uses a new method, Class Indexing.
This method is robust and the correct solution can be achieved even if one or more detected band is not included in the list of reference reflectors
The system is less sensitive to the operator selecting the number of bands and reflectors
Distinguish similar crystal structures
AZtec correctly indentifies phases with similar crystal structures by comparing band width.
A new and innovative ‘Refined Accuracy Algorithm*’extends traditional EBSD analysis to deliver unrivalled accuracy and level of detail...