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Low-Frequency Hydrophone Calibration Using Elastic Waveguides

dc.contributor.authorDrinnan, Robert
dc.contributor.copyright-releaseNoen_US
dc.contributor.degreeMaster of Scienceen_US
dc.contributor.departmentDepartment of Oceanographyen_US
dc.contributor.ethics-approvalNot Applicableen_US
dc.contributor.external-examinerN/Aen_US
dc.contributor.graduate-coordinatorDr. David Barclayen_US
dc.contributor.manuscriptsNoen_US
dc.contributor.thesis-readerDr. Craig Brownen_US
dc.contributor.thesis-readerDr. Jean-Francois Bousqueten_US
dc.contributor.thesis-supervisorDr. David Barclayen_US
dc.date.accessioned2023-08-14T18:04:29Z
dc.date.available2023-08-14T18:04:29Z
dc.date.defence2023-06-15
dc.date.issued2023-08-08
dc.description.abstractModern hydrophone calibration techniques typically require sensors to be placed in a free field or within a hydrostatically varying chamber. Between 1 kHz and 10 kHz, the wavelength in water is too long for free-field conditions to be used in common tank sizes. A novel technique to calibrate hydrophones is investigated to address the measurement gap between very low-frequency and high-frequency techniques. Calibrations are performed in a 12-meter copper tube coiled into a 1-meter diameter helix. This elastic waveguide decreases the speed of sound within the apparatus, providing a longer reverb-free time for calibrations using a small volume. The propagation within the waveguide is studied with the deviations from the predicted theory discussed. Calibrations performed on Ocean Sonics icListen hydrophones are shown to be within 1 dB of independently calibrated reference measurements. This research demonstrates that using elastic waveguides is an effective and simple low-frequency hydrophone calibration method.en_US
dc.identifier.urihttp://hdl.handle.net/10222/82780
dc.language.isoenen_US
dc.subjectCalibrationen_US
dc.subjectUnderwater acousticsen_US
dc.subjectSound in pipesen_US
dc.titleLow-Frequency Hydrophone Calibration Using Elastic Waveguidesen_US

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