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Multitip scanning bio-Kelvin probe

Baikie, I.D., Smith, P.J.S., Porterfield, D.M. and Estrup, P.J. (1999) Multitip scanning bio-Kelvin probe Review of Scientific Instruments, 70, (3), p. 1842. (doi:10.1063/1.1149678).

Record type: Article

Abstract

We have developed a novel multitip scanning Kelvin probe which can measure changes in biological surface potential ?Vs to within 2 mV and, quasisimultaneously monitor displacement to <1 ?m. The control and measurement subcomponents are PC based and incorporate a flexible user interface permitting software control of each individual tip, measurement, and scan parameters. We review the mode of operation and design features of the scanning bio-Kelvin probe including tip steering, signal processing, tip calibration, and novel tip tracking/dithering routines. This system uniquely offers both tip-to-sample spacing control (which is essential to avoid spurious changes in ?Vs due to variations in mean spacing) and a dithering routine to maintain tip orientation to the biological specimen, irrespective of the latter’s movement. These features permit long term (>48 h) “active” tracking of the displacement and biopotentials developed along and around a plant shoot in response to an environmental stimulus, e.g., differential illumination (phototropism) or changes in orientation (gravitropism). © 1999 American Institute of Physics.

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Published date: March 1999

Identifiers

Local EPrints ID: 190523
URI: http://eprints.soton.ac.uk/id/eprint/190523
ISSN: 0034-6748
PURE UUID: 430eadc3-2fb7-47ff-bef4-53233b359feb
ORCID for P.J.S. Smith: ORCID iD orcid.org/0000-0003-4400-6853

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Date deposited: 20 Jun 2011 09:21
Last modified: 18 Jul 2017 11:38

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Contributors

Author: I.D. Baikie
Author: P.J.S. Smith ORCID iD
Author: D.M. Porterfield
Author: P.J. Estrup

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