Upgrades & Accessories

• Eliminates by software the fact the tilt is not eucentric
• Easy tilting due correction of non-eucentricity
• Easy-to-use
• Can be used for double-tilt holder calibration
• Fully embedded in User interface
• Reliable

Compucentricity Datasheet [PDF]

• Compucentricity consists of software for the compucentricity calculations and holder calibration procedure. Its use is through the regular microscope user interface goniometer control or through additional software packages such as k-Space Control and Smart Tilt.
• When applied to a calibrated double-tilt holder, the image movements resulting from (even large) changes in beta-tilt angle can be reduced to values as small as 1 to 2 micrometers whereas real displacements that can amount up to several hundreds of micrometers on the X and Z axes.
• The beta tilt axis of the any double-tilt holder is non-eucentric because there is not enough space between the objective-lens pole pieces to construct a second eucentric tilt (beta-tilt eucentricity would require changing the height of the beta tilt axis relative to the alpha tilt). The behavior of the non-eucentric beta tilt is, however, predicable when the location of the beta tilt axis is known. By deriving the latter from a calibration procedure, corrections can be applied to the other stage axes (predominantly X and Z) to compensate for the non-eucentric motion. The accuracy of the compensation strongly depends on the accuracy of specimen-position measurement. The effective compensation accuracy is of the order of 1 to 2 micrometers, independent of the actual change in beta tilt applied. Since manual beta tilting is typically done slowly, the compucentric corrections would be worse than any typical image movement during manual tilting. Compucentric corrections are therefore only used when (larger) software-controlled changes in beta tilt are applied.
• Compucentric tilting is, of course, possible only on a goniometer where all five stage axes are under software control (i.e. the CompuStage).

Application Notes

• Tecnai™ S/TEM Software - Enabling Enhanced S/TEM Imaging and Analysis for Semiconductor Laboratories

Additional Recommended Items:

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Smart Tilt control

Smart Tilt gives assistance to the user in tilting with a double-tilt specimen holder of the CompuStage.

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Tecnai Microscope Control Upgrade - Version 4.0

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Double tilt TEM specimen holder ideal for combination with EDX.

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