Application of an FFT-based algorithm to signal processing of LVDT position sensors

Author

Crescini, Damiano ; Flammini, Allessandra ; Marioli, Daniele ; Taroni, Andrea

Author_Institution

Dept. of Electron. for Autom., Brescia Univ., Italy

Volume

47

Issue

5

fYear

1998

fDate

10/1/1998 12:00:00 AM

Firstpage

1119

Lastpage

1123

Abstract

This paper presents a new method for signal processing of linear variable differential transformer (LVDT) position sensors. Based on a spectral estimation of the differential secondary signal, the method has been implemented using a floating-point digital signal processor (DSP) and a 14-bit analog interface circuit (AIC) to generate the primary signal and to process the primary and the secondary signals. Compared with the classic solution based on synchronous demodulation the resulting accuracy is improved. Heavy filtering is not required, except for the anti-aliasing function. The algorithm decreases the measuring time and offers diagnostic capability

Keywords

differential transformers; digital signal processing chips; discrete Fourier transforms; electric sensing devices; position measurement; signal processing equipment; spectral analysis; FFT; LVDT position sensors; analog interface circuit; anti-aliasing function; differential secondary signal; filtering; floating-point digital signal processor; linear variable differential transformer; primary signal; secondary signals; signal processing; spectral analysis; spectral estimation; synchronous demodulation; Circuits; Demodulation; Digital signal processors; Displacement measurement; Frequency; Magnetic separation; Signal processing; Signal processing algorithms; Temperature; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.746567

Filename

746567