Abstract
| Original language | English |
|---|---|
| Article number | 055003 |
| Number of pages | 1 |
| Journal | Measurement Science and Technology |
| Volume | 28 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 3 Mar 2017 |
Cite this
Realising traceable electrostatic forces despite non-linear balance motion. / Stirling, Julian; Shaw, Gordon A.
In: Measurement Science and Technology, Vol. 28, No. 5, 055003, 03.03.2017.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Realising traceable electrostatic forces despite non-linear balance motion
AU - Stirling, Julian
AU - Shaw, Gordon A
PY - 2017/3/3
Y1 - 2017/3/3
N2 - Direct realisation of force, traceable to fundamental constants via electromagnetic balances, is a key goal of the proposed redefinition of the international system of units (SI). This will allow small force metrology to be performed using an electrostatic force balance (EFB) rather than subdivision of larger forces. Such a balance uses the electrostatic force across a capacitor to balance an external force. In this paper we model the capacitance of a concentric cylinder EFB design as a function of the displacement of its free electrode, accounting for the arcuate motion produced by parallelogram linkages commonly used in EFB mechanisms. From this model we suggest new fitting procedures to reduce uncertainties arising from non-linear motion as well as methods to identify misalignment of the mechanism. Experimental studies on both a test capacitor and the NIST EFB validate the model.
AB - Direct realisation of force, traceable to fundamental constants via electromagnetic balances, is a key goal of the proposed redefinition of the international system of units (SI). This will allow small force metrology to be performed using an electrostatic force balance (EFB) rather than subdivision of larger forces. Such a balance uses the electrostatic force across a capacitor to balance an external force. In this paper we model the capacitance of a concentric cylinder EFB design as a function of the displacement of its free electrode, accounting for the arcuate motion produced by parallelogram linkages commonly used in EFB mechanisms. From this model we suggest new fitting procedures to reduce uncertainties arising from non-linear motion as well as methods to identify misalignment of the mechanism. Experimental studies on both a test capacitor and the NIST EFB validate the model.
U2 - 10.1088/1361-6501/aa5e15
DO - 10.1088/1361-6501/aa5e15
M3 - Article
VL - 28
JO - Measurement Science and Technology
JF - Measurement Science and Technology
SN - 0957-0233
IS - 5
M1 - 055003
ER -