Low-Frequency Acoustic Sources for Ocean Acoustic Propagation Experiments
Abstract
the workhorse in a series of ONR-funded experiments to study low-frequency, deep-water oceanacoustic propagation. The source employ""s a narrow-band, medium-output, high-efficiencyresonator that transmits a frequency sweep by mechanically tuning the resonator to m"atch thefrequency and phase of a swept-frequency reference signal. SIO purchased three TWR sweptfrequencysources (225~325 Hz) for use in the 2004~2005 NPAL (North Pacific AcousticLaboratory) experiment. Two 200~300 Hz sources and an ultralow frequency (140~205 Hz)source were subsequently purchased for use in the 2010~2011 NPAL Philippine Sea experiment.The oldest sources owned by SIO are" well over a decade old, and even the youngest is over sixyears old. The source electronics, including the power amplifier and tran""sducer matchingcircuitry, are now obsolete. It is no longer possible to maintain the existing electronics, as manyof the critical"" components are not available. Teledyne Webb Research has under developmentmodern, more capable source electronics for use in their"" new sources. We propose here toupgrade all six sources that belong to SIO, including replacing the electronics and, wherenecessar""y, the actuators that move the sleeves used to tune the resonator frequency, with modernversions. The upgrades will expand the capa"bilities of the sources and extend their lives for usein future ONR-funded experiments. The upgrades will provide the ability to pr"ogram morecomplex frequency-modulated signals (e.g., up-down and/or non-linear FM sweeps) and tocontrol the signal amplitude. The" new electronics will also have the ability to transmitnarrowband signals with arbitrary waveforms with the tunable resonator in a fixed position. Weanticipate that data obtained in future ONR-funded ocean acoustic experiments using theupgraded TWR sources will contribute to the education and research of graduate students andpost-graduate researchers.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 03, 2017
- Source ID
- N000141713006
Entities
People
- Peter F. Worcester
Organizations
- Office of Naval Research
- United States Navy
- University of California, San Diego