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dc.contributor.advisorBaker, Steven R.
dc.contributor.advisorCrocker, Steven E.
dc.contributor.authorSlater, William H.
dc.dateSep-16
dc.date.accessioned2016-11-02T17:18:03Z
dc.date.available2016-11-02T17:18:03Z
dc.date.issued2016-09
dc.identifier.urihttp://hdl.handle.net/10945/50486
dc.description.abstractIn this report, a phase measurement is added to the Underwater Sound Reference Division (USRD) reciprocity coupler primary calibration procedure for an H48 reference hydrophone. Data acquisition equipment is added to record time-series data from the hydrophone under test and from the reciprocal transducers. The complex-valued hydrophone sensitivity is calculated. The sensitivity magnitude is compared to measurements from the standard coupler calibration procedure, and the complex sensitivity data are also fitted to a simple high-pass circuit model. The model is used to estimate the low-frequency cutoff of H48 hydrophone SN4. The low-frequency cutoff measured in this report is about 0.2 Hz higher than that originally measured and specified when the H48 hydrophones were first built. The new results show significant roll-off in phase below 10-20 Hz, a range where the phase is typically assumed flat during the standard calibration. By 1 Hz the phase roll-off is about 20°. The error analysis of the original coupler is summarized and error and uncertainty due to new data acquisition equipment and phase measurement added. Some errors due to simplifications in the acoustics of the coupler are left to future work.en_US
dc.description.urihttp://archive.org/details/extendingcalibra1094550486
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleExtending the calibration in the Underwater Sound Reference Division (USRD) reciprocity coupler to incorporate phaseen_US
dc.typeThesisen_US
dc.contributor.departmentEngineering Acoustics Academic Committee
dc.subject.authoracousticen_US
dc.subject.authorcalibrationen_US
dc.subject.authorcoupleren_US
dc.subject.authorreciprocityen_US
dc.subject.authorphaseen_US
dc.subject.authoruncertaintyen_US
dc.subject.authorcomplex uncertaintyen_US
dc.subject.authorH48en_US
dc.subject.authorhydrophoneen_US
dc.subject.authorUnder-water Sound Reference Divisionen_US
dc.subject.authorUSRDen_US
dc.description.serviceCivilian, Department of the Navyen_US
etd.thesisdegree.nameMaster of Science in Engineering Acousticsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineEngineering Acousticsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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