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Resonance Frequency of a Piezo Flexure Stage
The first (or lowest) resonance frequency per axis is typically specified for a nanopositioner. The resonance frequency could be of the mode along the motion axis or along other axes including rotation and other complex modes. In general, the higher the resonance frequency of a system, the higher the stability...
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Two New Piezo Stages from nPoint
The NPXY60-258 and the NPXY60Z20-257 piezo stages are the latest additions to nPoint’s nanopositioning lineup. These stages are designed for advanced research markets in need of UHV and non-magnetic positioning. Middleton, WI – May 14, 2014 – The NPXY60-258 and NPXY60Z20-257 nanopositioners are piezo driven, flexure guided stages, designed for...
Piezo Stage Sensors for Closed-loop Control
A position sensor is necessary to provide closed-loop control for the nanopositioning system. There are different types of sensors that can be used to provide the measuring feedback to eliminate inherent issues with piezos such as non-linearity and hysteresis. Three common types of sensors include capacitive, strain gauge, and LVDT. ...
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...
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...
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...
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