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Hyperfine Interactions

, Volume 202, Issue 1–3, pp 63–71 | Cite as

Design and construction of an electromechanical velocity modulator for Mössbauer spectroscopy

  • A. A. VelásquezEmail author
  • A. Carmona
  • D. Velásquez
  • L. Ángel
Article

Abstract

In this paper we report the design, construction and characterization of an electromechanical velocity modulator for application in Mössbauer spectroscopy. The modulator was constructed with copper coils, Neodymium magnets, steel cores and polymeric membranes. The magnetic field in the driving and velocity sensing stages was analyzed by the finite element method, which showed a linear relation between the magnetic field in the region of motion of both coils and the position of the coils within the steel cores. The results obtained by computational simulation allowed us to optimize geometries and dimensions of the elements of the system. The modulator presented its first resonance frequency at 16.7 Hz, this value was in good agreement with that predicted by a second order model, which showed a resonant frequency of 16.8 Hz. The linearity of the velocity signal of the modulator was analyzed through an optical method, based on a Michelson–Morley interferometer, in which the modulator moved one of the mirrors. Results showed a satisfactory linearity of the velocity signal obtained in the sensing coil, whose correlation with a straight line was around 0.99987 for a triangular reference waveform.

Keywords

Mössbauer spectroscopy Velocity modulator Finite element method Optical calibration 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • A. A. Velásquez
    • 1
    Email author
  • A. Carmona
    • 1
  • D. Velásquez
    • 2
  • L. Ángel
    • 2
  1. 1.Grupo de Electromagnetismo AplicadoUniversidad EAFITMedellínColombia
  2. 2.Grupo de Óptica AplicadaUniversidad EAFITMedellínColombia

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