TITLE

Cantilever spring constant calibration using laser Doppler vibrometry

AUTHOR(S)
Ohler, Benjamin
PUB. DATE
June 2007
SOURCE
Review of Scientific Instruments;Jun2007, Vol. 78 Issue 6, p063701
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Uncertainty in cantilever spring constants is a critical issue in atomic force microscopy (AFM) force measurements. Though numerous methods exist for calibrating cantilever spring constants, the accuracy of these methods can be limited by both the physical models themselves as well as uncertainties in their experimental implementation. Here we report the results from two of the most common calibration methods, the thermal tune method and the Sader method. These were implemented on a standard AFM system as well as using laser Doppler vibrometry (LDV). Using LDV eliminates some uncertainties associated with optical lever detection on an AFM. It also offers considerably higher signal to noise deflection measurements. We find that AFM and LDV result in similar uncertainty in the calibrated spring constants, about 5%, using either the thermal tune or Sader methods provided that certain limitations of the methods and instrumentation are observed.
ACCESSION #
25684855

 

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