Broadband interferometric characterisation of nano-positioning stages with sub-10 pm resolution
2017
A traceable calibration setup for investigation of the quasi-static and the dynamic performance of nano-positioning
stages is detailed, which utilizes a differential plane-mirror interferometer with double-pass configuration from the
National Physical Laboratory (NPL). An NPL-developed FPGA-based interferometric data acquisition and decoding
system has been used to enable traceable quasi-static calibration of nano-positioning stages with high resolution. A lockin
based modulation technique is further introduced to quantitatively calibrate the dynamic response of moving stages
with a bandwidth up to 100 kHz and picometer resolution. First experimental results have proven that the calibration
setup can achieve under nearly open-air conditions a noise floor lower than 10 pm/sqrt(Hz). A pico-positioning stage,
that is used for nanoindentation with indentation depths down to a few picometers, has been characterized with this
calibration setup.
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