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Sensors 2012, 12(8), 10820-10833; doi:10.3390/s120810820
Article

A Linear, Millimetre Displacement-to-Frequency Transducer

1,*  and 2
1 Department of Electrical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa 2 P.O. Box 401783, Broadhurst, Gaborone, Botswana
* Author to whom correspondence should be addressed.
Received: 1 July 2012 / Revised: 21 July 2012 / Accepted: 26 July 2012 / Published: 6 August 2012
(This article belongs to the Section Physical Sensors)
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Abstract

The paper presents a novel linear, high-fidelity millimetre displacement-to-frequency transducer, based on the resistive conversion of displacement into a proportional voltage, and then frequency. The derivation of the nonlinearity, fidelity and sensitivity of the transducer is presented. Experimental results confirm that a displacement of 0–100 mm is converted into a frequency range of 0–100 kHz, with a normalised fidelity factor of 99.91%, and a worst-case nonlinearity of less than 0.08%. Tests using laboratory standards show that a displacement of 10 mm is transduced with an accuracy of ±0.6%, and a standard deviation of 530 Hz. Estimates included in the paper show that the transducer could cost less than 1% of existing systems for millimeter displacement measurement.
Keywords: millimetre displacement; displacement-to-frequency; high-fidelity millimetre displacement; displacement-to-frequency; high-fidelity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Agee, J.T.; Petto, F.K. A Linear, Millimetre Displacement-to-Frequency Transducer. Sensors 2012, 12, 10820-10833.

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