A new capacitive sensor for displacement measurement in a surface force apparatus

Details A new capacitive sensor for displacement measurement in a surface force apparatus A new capacitive sensor for displacement measurement in a surface force apparatus

2001-02-13

arxiv.org/abs/cond-mat/0102225v1

Meas. Sci. Tech., vol 12, p:16-22, (2001)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 8 figures

Scientific paper

10.1088/0957-0233/12/1/302

We present a new capacitive sensor for displacement measurement in a Surface Forces Apparatus (SFA) which allows dynamical measurements in the range of 0-100 Hz. This sensor measures the relative displacement between two macroscopic opaque surfaces over periods of time ranging from milliseconds to in principle an indefinite period, at a very low price and down to atomic resolution. It consists of a plane capacitor, a high frequency oscillator, and a high sensitivity frequency to voltage conversion. We use this sensor to study the nanorheological properties of dodecane confined between glass surfaces.

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