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Your search keyword '"Theobald, Pete"' showing total 27 results
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27 results on '"Theobald, Pete"'

1. Measurement of Underwater Noise Arising From Marine Aggregate Operations

Author

Robinson, Stephen P., Theobald, Pete D., Lepper, Paul A., Hayman, Gary, Humphrey, Victor F., Wang, Lian-Sheng, Mumford, Samantha, Back, Nathan, Series Editor, Cohen, Irun R., Series Editor, Lajtha, Abel, Series Editor, Lambris, John D., Series Editor, Paoletti, Rodolfo, Series Editor, Popper, Arthur N., editor, and Hawkins, Anthony, editor

Published
2012
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2. Assessment of Cumulative Sound Exposure Levels for Marine Piling Events

Author

Lepper, Paul A., Robinson, Stephen P., Ainslie, Michael A., Theobald, Pete D., de Jong, Christ A. F., Back, Nathan, Series Editor, Cohen, Irun R., Series Editor, Lajtha, Abel, Series Editor, Lambris, John D., Series Editor, Paoletti, Rodolfo, Series Editor, Popper, Arthur N., editor, and Hawkins, Anthony, editor

Published
2012
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7. COMPILE—A Generic Benchmark Case for Predictions of Marine Pile-Driving Noise

Author

Lippert, Stephan, primary, Nijhof, Marten, additional, Lippert, Tristan, additional, Wilkes, Daniel, additional, Gavrilov, Alexander, additional, Heitmann, Kristof, additional, Ruhnau, Marcel, additional, von Estorff, Otto, additional, Schafke, Alexandra, additional, Schafer, Ingo, additional, Ehrlich, Jan, additional, MacGillivray, Alexander, additional, Park, Jungyong, additional, Seong, Woojae, additional, Ainslie, Michael A., additional, de Jong, Christ, additional, Wood, Michael, additional, Wang, Lian, additional, and Theobald, Pete, additional

Published
2016
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12. Absolute calibration of hydrophones immersed in sandy sediment

Author

Robb, Gary B.N., Robinson, Stephen P., Theobald, Pete D., Hayman, Gary, Humphrey, Victor F., Leighton, Timothy G., Wang, Lian Sheng, Dix, Justin K., Best, Angus I., Robb, Gary B.N., Robinson, Stephen P., Theobald, Pete D., Hayman, Gary, Humphrey, Victor F., Leighton, Timothy G., Wang, Lian Sheng, Dix, Justin K., and Best, Angus I.

Abstract

An absolute calibration method has been developed based on the method of three-transducer spherical-wave reciprocity for the calibration of hydrophones when immersed in sandy sediment. The method enables the determination of the magnitude of the free-field voltage receive sensitivity of the hydrophone. Adoption of a co-linear configuration allows the acoustic attenuation within the sediment to be eliminated from the sensitivity calculation. Example calibrations have been performed on two hydrophones inserted into sandy sediment over the frequency range from 10 to 200 kHz. In general, a reduction in sensitivity was observed, with average reductions over the frequency range tested of 3.2 and 3.6 dB with respect to the equivalent water-based calibrations for the two hydrophones tested. Repeated measurements were undertaken to assess the robustness of the method to both the influence of the sediment disturbance associated with the hydrophone insertion and the presence of the central hydrophone. A simple finite element model, developed for one of the hydrophone designs, shows good qualitative agreement with the observed differences from water-based calibrations. The method described in this paper will be of interest to all those undertaking acoustic measurements with hydrophones immersed in sediment where the absolute sensitivity is important.

Published
2009

17. Measurement of radiated ship noise

Author

Wang, Lian S., primary, Robinson, Stephen P., additional, Theobald, Pete, additional, Lepper, Paul A., additional, Hayman, Gary, additional, and Humphrey, Victor F., additional

Published
2013
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27. Novel non-contact optical characterisation methods of polymeric nanocomposite structures based on their particle loading and dispersion profile

Author

Koukoulas, Triantafillos, Broughton, William R., Tedaldi, Matthew, and Theobald, Pete D.

Abstract

Current methods to characterise specific properties of polymeric nanocomposites (PNCs), such as particle loading and dispersion profile, rely on a number of techniques that require special sample preparation and treatment, are very expensive, require long measurement times and quite often produce ambiguous results that are difficult to evaluate and interpret. In addition, given their complexity, they are not entirely suited for in-situ industrial environments. This paper presents alternative techniques based on optical diffraction and diffusion mechanisms combined with signal processing that can successfully discriminate between different particle loadings and levels of dispersion. The techniques discussed in this paper are Fourier-domain optical coherence tomography in the infra-red, Fraunhofer wavefront correlation in the visible red and oscillatory photon correlation spectroscopy in the visible green parts of the spectrum. Most importantly, they are non-invasive, are compact, fast and efficient, can potentially analyse large areas of the material and therefore suited for a wide variety of research and industrial situations.

Published
2011
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