Solutions for leakage problems with multi-sine excitation

Matthias Schuessler; Michael Woertge

doi:10.1117/12.386730

22 May 2000 Solutions for leakage problems with multi-sine excitation

Matthias Schuessler, Michael Woertge

Proceedings Volume 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2000) https://doi.org/10.1117/12.386730
Event: 4th International Conference on Vibration Measurement by Laser Techniques, 2000, Ancona, Italy

Abstract

In many vibrometer applications, the measured structure is excited not only by the controlled excitation source, but also by secondary, unwanted excitation sources. The effects of those disturbing excitation sources can often be limited to a small frequency range by windowing. As measurements with multi-sine excitations like periodic-chirp require a rectangular window, which provides very poor leakage reduction, the unwanted excitation sources leak out to a wide frequency range. This leakage can considerably limit the signal-to-noise ratio. The disturbing excitation sources are typically at low frequencies. As velocity is scaled to acceleration by i2(pi) f, low frequencies are better attenuated for acceleration signals than for velocity signals. Therefore it is especially important to reduce the effects of the disturbing excitation sources when measuring with vibrometers. Several methods of reducing the leakage effects of the disturbing excitation have been developed and are compared in this paper.

Citation Download Citation

Matthias Schuessler and Michael Woertge "Solutions for leakage problems with multi-sine excitation", Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); https://doi.org/10.1117/12.386730

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KEYWORDS

Time metrology

Signal to noise ratio

Superposition

Interference (communication)

Sensors

Electronic filtering

Environmental sensing

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