ECE Seminar Speaker: Dr. Andrey K. Morozov, Chief Scientist, Teledyne TWR
Science & Engineering Building (SENG), Room 212
Ana Doblas
508.999.8471
adoblas@umassd.edu
Topic: Underwater Bubble Resonator for Low-Frequency and Very-Low-Frequency Seismo-acoustic Sources
Abstract: The reducing impact of noise from traditional air-guns on marine mammals is an actual problem for oil and gas producers. The application of coherent, broadband signals instead of explosive, high intensity, air-gun pulses is the potential way of noise mitigation. The presentation focuses on a project by Teledyne being carried out as part of the Marine Vibrator Joint Industry Project (MVJIP), organized by industry representatives and the Interior Department, National Resources Development Council (NRDC). Marine Vibrators are a coherent type of seismic source, which less harmful for marine inhabitants and gives a clearer, higher resolution imaging of the sub-bottom formations. Teledyne as one of the participants in the MVJIP using a large underwater bubble resonator as a new type of seismic source. The cylindrical bubble keeps its shape in the water and can be towed with the speed 8 knots. The polyurethane membrane covering the gas-filled bubble supports a high-volume displacement. The experimental prototype with powerful blower as a driver has good performance with a maximum more than SPL 200 dB at the frequency of 5-12 Hz. For a limited sound pressure level 185 dB in a frequency band 10-100 Hz the audio subwoofer driver shows very good performance. An underwater acoustic subwoofer array operating in the 10–100 Hz range offers a potential efficiency of up to 20%, with a radiated signal spectral level comparable to the power of an air gun. This makes the system suitable for marine geophysical surveys.
Biography: Dr. Andrey K. Morozov has held the position of Chief Scientist at Teledyne TWR since 1999. Building on concepts proposed by Walter Munk, he developed a high-efficiency, low-frequency, deep-water sound source that utilizes a tunable "organ pipe" resonator to generate signals. Since 2001, these sources have been employed in numerous ocean tomography experiments across the Arctic, Atlantic, and Pacific Oceans. From 2012 to 2019, Andrey K. Morozov led a joint industry project to develop a marine vibrator. He invented and fabricated several prototypes of ultra-high-power marine vibrators operating in the 2–10 Hz and 10–100 Hz frequency ranges. While working at the Woods Hole Oceanographic Institution (WHOI) alongside Jim Preisig and Lee Freitag, he contributed to the development of underwater communication methods by publishing research on multi-carrier modulation, OFDM technology, modal filtering using acoustic arrays, and per-survivor processing algorithms. In collaboration with John Colosi, he conducted research and published papers on acoustic uncertainty theory, ray and wave chaos, scintillation and entropy in long-range sound propagation. During his 27-year tenure at Teledyne TWR, he worked closely with Doug Webb and co-authored numerous patents across various fields. He served as the principal investigator for Teledyne on DARPA projects. Andrey K. Morozov has over 50 years of experience in research and development in fields such as communications, signal processing, and underwater acoustics. He is currently (2026-) an Adjunct Professor in the ECE Dept at UMass Dartmouth.
The Seminars is open to the public free of charge.
*For further information, please contact Dr. Ana Doblas via email at adoblas@umassd.edu.