Future prospects on EBSD speeds using a 40 nA FESEM

Søfferud, Mario; Hjelen, J.; Karlsen, Morten; Dingley, David J.; Jaksch, Heiner

doi:10.1007/978-3-540-85156-1_313

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(2 citation statements)

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“…To achieve ultra‐fast collection speed (frame rate) of EBSD, the camera exposure time (Søfferud et al , 2008a) has to be short and hence the probe current has to be increased (Søfferud et al , 2008b) to maintain the same signal to noise ratio. If we just increase the frame rate without compensating the probe current, the fraction of indexed points and IQ linearly decrease with the increase of frame rate, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Since then, the EBSD technique has experienced two important steps. Step 1, reliable automatic indexing (Krieger Lassen et al , 1992), Step 2, ultra‐fast speed based on offline EBSD collection and re‐indexing techniques (EDAX/TSL, 2007; Søfferud et al , 2007, 2008a, b) assisted by improvements in digital camera and modern computer (Wright & Nowell, 2008). The offline EBSD technique adopts the idea of separating the acquisition and indexing processes to take many advantages over online EBSD (Schwarzer & Hjelen, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Optimization of EBSD parameters for ultra‐fast characterization

Chen¹,

Hjelen²,

Gireesh³

et al. 2011

Journal of Microscopy

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SummaryUltra-fast pattern acquisition of electron backscatter diffraction and offline indexing could become a dominant technique over online electron backscatter diffraction to investigate the microstructures of a wide range of materials, especially for in situ experiments or very large scans. However, less attention has been paid to optimize the parameters related to ultra-fast electron backscatter diffraction. The present results show that contamination on a clean and unmounted specimen is not a problem even at step sizes as small as 1 nm at a vacuum degree of 6.1 × 10 −5 Pa. There exists an optimum step size at about 50 data acquisition board units. A new and easy method to calculate the effective spatial resolution is proposed. Effective spatial resolution tends to increase slightly as the probe current increases from 10 to 100 nA. The fraction of indexed points decreases slightly as the frame rate increases from 128 patterns per second (pps) to 835 pps by compensating the probe current at the same ratio. The value 96 × 96 is found to be the optimum pattern resolution to obtain optimum speed and image quality. For a fixed position of electron backscatter diffraction detector, the fraction of indexed points as a function of working distance has a maximum value and drops sharply by shortening the working distance and it decreases slowly with increasing the working distance.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%