Capacitance micrometry detects atomic scale displacements

Capacitance micrometry detects atomic scale displacements

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By eeNews Europe

This state-of-the-art non-contact position measuring system relies on 2 sensor plates – a target and a probe, which between them form a parallel plate capacitor. Through the use of an appropriate electronic controller, the spacing of these two plates can be accurately ascertained. Among the key applications for the NX NanoSensor are stage feedback, vibration measurement, metrology, deformation measurements, precision manufacturing, drift measurement, precision beam steering and microscopy.

Via NX NanoSensor position can be determined to a margin of better than 7pm, with a linearity to 0.02% and a bandwidth from 50Hz up to 10KHz. There is provision for the system to be tuned so that either the positional accuracy is improved or conversely the responsiveness to dynamic motion is heightened. A choice of plate shapes is available, including round, square or rectangular, with active areas of 22.5, 113 and 282mm2. Working in tandem with the NX NanoSensor, the NS2000 controller module measures any changes in the parallel plate capacitance and subsequently produces an analogue voltage that is directly proportional to the difference in position of the target and a probe sensor plates.

The non-contact measurement and non-self-heating mechanism means that NX NanoSensor products do not impact the values they are measuring, thereby giving true nanoscale measurements. Furthermore, they use a non-hysteretic technique, which means the position is repeatable.

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