Abstract
A novel technique is represented that allows one to measure vibrations from a distant object with micron and sub-micron amplitudes in real time.
The method is based on the speckle interference phenomena and speckle pattern analysis. The scheme allows us to use a single photodiode as a photo-detector and to obtain information from an analog signal without any additional post-processing, which significantly simplifies the device realization compared with the available today laser vibrometers based both on interferometric and on speckle pattern analysis principles.
The scheme investigated was implemented as a device and several studies of the practical applications were carried out.
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Veber, A.A., Lyashedko, A., Sholokhov, E. et al. Laser vibrometry based on analysis of the speckle pattern from a remote object. Appl. Phys. B 105, 613–617 (2011). https://doi.org/10.1007/s00340-011-4585-1
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DOI: https://doi.org/10.1007/s00340-011-4585-1