Smooth driving of Mössbauer electromechanical transducers

A. VEIGA; M. MAYOSKY; MARTÍNEZ N H; MENDOZA ZÉLIS P.; G. A. PASQUEVICH; F. H. SÁNCHEZ

HYPERFINE INTERACTIONS

Springer Netherlands

Año: 2011 vol. 202 p. 107 - 115

0304-3843

Quality of Mössbauer spectra is strongly related to the performance of source velocity modulator. Traditional electromechanical driving techniques demand hard-edged square or triangular velocity waveforms that introduce long settling times and demand careful driver tuning. For this work, the behavior of commercial velocity transducers and drive units was studied under different working conditions. Different velocity reference waveforms in constant-acceleration, constant-velocity and programmable-velocity techniques were tested. Significant improvement in spectrometer efficiency and accuracy was achieved by replacing triangular and square hard edges with continuous smooth-shaped transitions. A criterion for best waveform selection and synchronization is presented and attainable enhancements are evaluated. In order to fully exploit this driving technique, a compact microprocessor-based architecture is proposed and a suitable data acquisition system implementation is presented. System linearity and efficiency characterization are also shown.