A high precision surface potential imaging torsion pendulum facility to investigate physical mechanism of patch effect.
The Review of scientific instruments(2023)
摘要
The physical mechanism of the patch effect is still an open question. Thus, a high-precision surface potential mapping facility based on a specially designed electrostatically-controlled torsion pendulum is proposed in this paper. The facility not only features high sensitivity and a two-dimensional mapping function but also adapts to various measurement requirements for centimeter-sized samples. The sensitivity of the torsion pendulum reaches about 2.0 × 10 N m/Hz in a frequency range of 1-8 mHz. The temporal variation of the surface potential can be detected at a level of 30 μV/Hz with a probe whose surface area is 7 mm. The potential spatial distribution resolution comes to 0.1 mm at a level of 40 μV with 1 h integration time.
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关键词
potential imaging torsion,high precision surface,pendulum facility,patch effect
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