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Proceedings Paper

Speckle photo-electromotive-force for the measurement of transverse mechanical vibrations
Author(s): R. Kumamoto; J. Frejlich
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Paper Abstract

Photo-electromotive-force effect induced by an oscillating speckle pattern of light onto photorefractive CdTe: V and Bi12TiO20 is studied. The light pattern is produced by the reflected laser beam on a vibrating surface. As a result of the photo-emf effect, a photocurrent signal in the material arises that is related to the vibrating surface amplitude and frequency. This electric signal is first pre-amplified by an op-amp in transimpedance regime and then the first temporal harmonic component is measured using a phase selective frequency tuned lock-in amplifier. This harmonic shows a maximum value occurring for certain value of the normalized vibration amplitude. This technique is been developed to be used for the measurement of transverse mechanical vibrations.

Paper Details

Date Published: 14 September 2010
PDF: 6 pages
Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871X (14 September 2010); doi: 10.1117/12.870679
Show Author Affiliations
R. Kumamoto, Univ. Estadual de Campinas (Brazil)
J. Frejlich, Univ. Estadual de Campinas (Brazil)


Published in SPIE Proceedings Vol. 7387:
Speckle 2010: Optical Metrology
Armando Albertazzi Goncalves; Guillermo H. Kaufmann, Editor(s)

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