title: Fast contactless vibrating structure characterization using real time field programmable gate array-based digital signal processing: demonstrations with a passive wireless acoustic delay line probe and vision.
abstract: Vibrating mechanical structure characterization is demonstrated using contactless techniques best suited for mobile and rotating equipments. Fast measurement rates are achieved using Field Programmable Gate Array (FPGA) devices as real-time digital signal processors. Two kinds of algorithms are implemented on FPGA and experimentally validated in the case of the vibrating tuning fork. A first application concerns in-plane displacement detection by vision with sampling rates above 10 kHz, thus reaching frequency ranges above the audio range. A second demonstration concerns pulsed-RADAR cooperative target phase detection and is applied to radiofrequency acoustic transducers used as passive wireless strain gauges. In this case, the 250 ksamples/s refresh rate achieved is only limited by the acoustic sensor design but not by the detection bandwidth. These realizations illustrate the efficiency, interest, and potentialities of FPGA-based real-time digital signal processing for the contactless interrogation of passive embedded probes with high refresh rates.
authors: FEMTO-ST, Time and Frequency Department, UMR CNRS 6174, Univ. Franche Comté, Besançon, France.
authors: G
authors: G
authors: Goavec-Mérou
authors: SENSeOR SAS, Besançon, France.
authors: N
authors: N
authors: Chrétien
authors: SENSeOR SAS, Besançon, France.
authors: J-M
authors: JM
authors: Friedt
authors: FEMTO-ST, Applied Mechanics Department, UMR CNRS 6174, Univ. Franche-Comté, Besançon, France.
authors: P
authors: P
authors: Sandoz
authors: FEMTO-ST, Time and Frequency Department, UMR CNRS 6174, Univ. Franche Comté, Besançon, France.
authors: G
authors: G
authors: Martin
authors: FEMTO-ST, Time and Frequency Department, UMR CNRS 6174, Univ. Franche Comté, Besançon, France.
authors: M
authors: M
authors: Lenczner
authors: Frec'n'sys SASU, Besançon, France.
authors: S
authors: S
authors: Ballandras