Piezo Scanner Settling Time

Settling time is defined as the time it takes for a piezo stage to move to a commanded position and settle to within 2% of its final value when performing a step response. A small signal step response reflects the dynamic characteristics of the system in greater detail. A step response for 1μm is a […]

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Piezo Positioner Resolution

The term position noise or resolution is a key measurement associated with piezo stages. This measurement is a determining factor of how small a step size can be achieved (the other being controller resolution). Please note that in a piezo flexure stage the limiting factors are different than other piezo motors or stick slip piezo […]

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Quadrature Interferometer Sensor Integration for Closed-loop Feedback

This article provides data that demonstrate the capability of nPoint controllers to integrate with quadrature sensor signals for closed-loop feedback. In some applications using an external sensor such as an interferometer can be essential in order to compensate for drift or maintain position in an entire system.  Adding this capability eliminates the need for internal […]

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Things to Consider When Acquiring a Nanopositioning System

There are many factors to consider when looking for nanopositioning piezo stages. The following series of articles will help explain some items that are important when looking at different stages and systems. Those who are new to the world of nanopositioning, please contact us with any additional questions. There are different types of “nanopositioners” on […]

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What does bandwidth mean?

Bandwidth is the frequency at which the actual oscillation amplitude is attenuated by -3dB from the commanded oscillation amplitude. This is approximately equal to the frequency at which the actual oscillation amplitude attenuates by 30% from the commanded oscillation amplitude. The bandwidth has to be tested with small driving signal, which guarantees that the attenuation […]

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