The precision and accuracy of routine EBSD measurements is constrained by many factors, while the angular resolution of standard EBSD systems is often quoted from 0.5° – 0.7° (Humphreys 2001).Fundamental to the EBSD technique is the method of identifying and locating the Kikuchi bands, hence the method chosen is one of the main factors determining the measurement accuracy and precision.
Conventional, fast band detection routines use a 2-D Hough transform (only). The limitations of the 2-D Hough transform for band detection are well documented (e.g. Maurice & Fortunier 2008). Up to a limit, accuracy and precision can be improved by increasing the Hough resolution. However, this results in a very large (and generally unacceptable) increase in computation time. Ultimately, accuracy is limited by a systematic error in applying the 2-D Hough to Kikuchi band detection: Kikuchi bands are hyperbolic, not straight. Band detection routines which rely solely on the 2-D Hough will be in error – a refinement to the detection routine is required. A new method (patent pending) is described.