title: A linear, millimetre displacement-to-frequency transducer.
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.
authors.affiliation: Department of Electrical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa. ageejt@tut.ac.za
authors.forename: John T
authors.initials: JT
authors.lastname: Agee
authors.forename: Four K
authors.initials: FK
authors.lastname: Petto
keywords: displacement-to-frequency; high-fidelity; millimetre displacement