Vibration monitoring using 2D speckle pattern images

Paul C. Russell; Gary O'Keeffe; Joe Cosgrave; Gordon R. Jones

doi:10.1117/12.273343

28 May 1997 Vibration monitoring using 2D speckle pattern images

Paul C. Russell, Gary O'Keeffe, Joe Cosgrave, Gordon R. Jones

Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273343
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States

Abstract

A high speed data acquisition system has been developed for monitoring the speckle pattern produced by a fiberdyne interferometer. The system captures data from a 256 element, linear, CCD array with sample frequencies of up to 18.5 kHz. Data from the system is in the form of a 2D image showing the variation in pixel intensity as a function of time. The system is used to address the speckle pattern produced by a fiberdyne interferometer which is used as a vibration sensor. Information taken using this system is compared with the predictions of an existing theoretical model which indicates that all speckles should be affected by a vibration signal but, that the amplitude and phase of the resulting variations will be speckle dependent. Data taken using this system agrees with these predictions. All of the pixels in the CCD array show some variation when subjected to a sinusoidal vibration signal. The amplitude and phase of the pixel signals show a considerable variation in both amplitude and phase, indicating that the model is valid. By averaging the spectra obtained by performing a Fourier transform on each pixel it is possible to substantially reduce noise effects making the system more sensitive to changes in the acoustic signal.

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Paul C. Russell, Gary O'Keeffe, Joe Cosgrave, and Gordon R. Jones "Vibration monitoring using 2D speckle pattern images", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); https://doi.org/10.1117/12.273343

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KEYWORDS

Speckle pattern

Interferometers

Charge-coupled devices

Speckle

Acoustics

Optical fibers

Human-machine interfaces

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