Application Note
Combining NPAR with spherical indexing – A unique method to solve the most challenging EBSD indexing problems
May 8, 2024
EDAX Neighbor Pattern Averaging & Reindexing (NPAR)
Improves EBSD indexing performance through increased signal-to-noise.
Advantages
EDAX® Neighbor Pattern Averaging and Reindexing (NPAR), is an innovative approach to measuring crystallographic orientation from electron backscatter diffraction (EBSD) patterns. Noise can reduce EBSD indexing performance by hindering the detection of the diffraction bands. Noise is introduced into EBSD patterns by amplifying the signal to obtain faster camera frame rates. EDAX’s advanced indexing and band detection routines perform well even with considerable noise. However, band detection becomes unreliable, and indexing performance suffers when the noise exceeds allowable limits. Noise levels can be lowered by reducing the gain on the detector and averaging multiple frames together. However, both approaches increase the acquisition time necessary for EBSD pattern collection and orientation mapping.
Averages EBSD patterns with neighboring patterns to reduces temporal noise, improving band detection and pattern indexing
Allows you to operate at higher gains for faster frame rates with successful indexing results
Improves spatial resolution allowing you to operate at lower acceleration voltages and beam currents
Enhances EBSD image quality mapping by averaging patterns adjacent to grain boundaries
Datasheet
Applications
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Application Note
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