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Noise floor of ScanAsyst

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Top 10 Contributor
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BrukerApplications posted on Tue, Jan 12 2010 1:03 PM

What is the noise floor of ScanAsyst?

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Top 10 Contributor
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Bruker Employee

The offset tip used in HarmoniX should enhance the signal-to-noise ratio of the cantilever during tapping mode; since you went back to a more traditional probe do you create more noise in your measurements?

Top 25 Contributor
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 With HarmoniX signal to noise is an issue on the vertical deflection axis only at integer multiples of the tapping drive frequency but not at the feedback frequency.  The offset tip used in HarmoniX enhances the signal-to-noise at integer multiples of the tapping drive frequency on the lateral axis.   A complete spectrum of these harmonics are required to construct force vs. time plots.  Being able to detect them on the lateral axis is a key part of HarmoniX.

The height channel in a HarmoniX image is the result of Tapping mode feedback taken from the vertical deflection channel and the noise is approximately equivalent to a Tapping Mode image taken with a traditional probe of similar spring constant and resonance frequency.

The noise floor of a ScanAsyst height image is approximately the same as from a Tapping Mode or HarmoniX height image. 

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Top 25 Contributor
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Points 340

The noise floor of a ScanAsyst height image is approximately the same as from a Tapping Mode or HarmoniX height image. 

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