Speckle photo-electromotive-force for the measurement of transverse mechanical vibrations

R. Kumamoto; J. Frejlich

doi:10.1117/12.870679

13 September 2010 Speckle photo-electromotive-force for the measurement of transverse mechanical vibrations

R. Kumamoto, J. Frejlich

Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871X (2010) https://doi.org/10.1117/12.870679
Event: Speckle 2010, 2010, Florianapolis, Brazil

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.

Citation Download Citation

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); https://doi.org/10.1117/12.870679

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