A dynamic microindentation device with electrical contact detection

Matthew A. Reilly; Gavin Perry; Nathan Ravi

doi:10.1063/1.3043428

A dynamic microindentation device with electrical contact detection

Matthew A. Reilly, Gavin Perry, Nathan Ravi

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We developed a microindentation instrument that allows direct measurement of the point of contact for reasonably conductive samples. This is achieved in the absence of a contact load using a simple electrical circuit. Force is measured using an optical interrupter to measure the deflection of a cantilever beam. Displacement is achieved using a piezoelectric motor and is measured using an independent optical interrupter. Force and displacement measurements are accomplished in real time, allowing the specification of arbitrary waveforms. The instrument was rigorously validated by comparing mechanical property measurements from the indenter with results from traditional dynamic mechanical analysis. Details of the construction and feedback control schemes are given explicitly.

Original language	English
Article number	015105
Journal	Review of Scientific Instruments
Volume	80
Issue number	1
DOIs	https://doi.org/10.1063/1.3043428
State	Published - 2009

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10.1063/1.3043428

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title = "A dynamic microindentation device with electrical contact detection",

abstract = "We developed a microindentation instrument that allows direct measurement of the point of contact for reasonably conductive samples. This is achieved in the absence of a contact load using a simple electrical circuit. Force is measured using an optical interrupter to measure the deflection of a cantilever beam. Displacement is achieved using a piezoelectric motor and is measured using an independent optical interrupter. Force and displacement measurements are accomplished in real time, allowing the specification of arbitrary waveforms. The instrument was rigorously validated by comparing mechanical property measurements from the indenter with results from traditional dynamic mechanical analysis. Details of the construction and feedback control schemes are given explicitly.",

author = "Reilly, {Matthew A.} and Gavin Perry and Nathan Ravi",

note = "Funding Information: We would like to acknowledge the contributions of Paul Hamilton in preparing gels and performing DMA tests. This work was supported by the Department of Veterans Affairs predoctoral rehabilitation fellowship to M.A.R. and Merit Review Grant to N.R., as well as the NIH Core Grant No. P30 EY 02697 and Research to Prevent Blindness, Inc.",

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AU - Ravi, Nathan

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PY - 2009

Y1 - 2009

N2 - We developed a microindentation instrument that allows direct measurement of the point of contact for reasonably conductive samples. This is achieved in the absence of a contact load using a simple electrical circuit. Force is measured using an optical interrupter to measure the deflection of a cantilever beam. Displacement is achieved using a piezoelectric motor and is measured using an independent optical interrupter. Force and displacement measurements are accomplished in real time, allowing the specification of arbitrary waveforms. The instrument was rigorously validated by comparing mechanical property measurements from the indenter with results from traditional dynamic mechanical analysis. Details of the construction and feedback control schemes are given explicitly.

AB - We developed a microindentation instrument that allows direct measurement of the point of contact for reasonably conductive samples. This is achieved in the absence of a contact load using a simple electrical circuit. Force is measured using an optical interrupter to measure the deflection of a cantilever beam. Displacement is achieved using a piezoelectric motor and is measured using an independent optical interrupter. Force and displacement measurements are accomplished in real time, allowing the specification of arbitrary waveforms. The instrument was rigorously validated by comparing mechanical property measurements from the indenter with results from traditional dynamic mechanical analysis. Details of the construction and feedback control schemes are given explicitly.

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A dynamic microindentation device with electrical contact detection

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