Title :
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
fDate :
10/1/1998 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
