A Linear, Millimetre Displacement-to-Frequency Transducer

Sensors

John T. Agee¹ 

[1] Department of Electrical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa

关键词: millimetre displacement;    displacement-to-frequency;    high-fidelity;   

DOI  :  10.3390/s120810820

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.