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13 September 2010 Speckle photo-electromotive-force for the measurement of transverse mechanical vibrations
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Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871X (2010)
Event: Speckle 2010, 2010, Florianapolis, Brazil
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.
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R. Kumamoto and J. Frejlich "Speckle photo-electromotive-force for the measurement of transverse mechanical vibrations", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871X (13 September 2010);

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