Instructor: Dr. Adam Zielinski,
Department of Electrical and Computer Engineering, University of Victoria
(http://www.ece.uvic.ca/faculty/azielinski.shtml)
This interdisciplinary course will be offered in Fall 2007.
SUMMARY
The course will provide a condensed but comprehensive overview of applied underwater acoustics that will be of value to graduate students, researchers and engineers interested in exploiting sound transmission in the sea for scientific and technical purposes. The topics to be covered will include characterization of underwater acoustic channels (propagation, ray tracing, reflection and refraction, ambient noise, reverberation), acoustic transducers and arrays (hydrophones and projectors, frequency response, directivity, beam-forming and steering) and sonar equations. Various applications (depth-sounder, side-looking sonar, underwater communications and navigation, and others) will be discussed and system performance evaluated using the system and channel's parameters. The course is suitable for students with a general engineering or physics background and can be taken for credit or as an audit. The course is most likely to be scheduled for Tuesdays and Thursdays, 2:30 pm to 4:00 pm.
Please contact Adam Zielinski (adam@uvic.ca) if you are interested in participating in this course.
ELEC 571 - UNDERWATER ACOUSTIC SYSTEMS
Course Syllabus
Unit 1. SOUND FUNDAMENTALS (30 pages)
- pressure waves
- sound speed
- pressure units
- sound reflection and refraction
- bottom reflection losses
- surface reflection losses
Unit 2. SOUND PROPAGATION (25 pages)
- source intensity
- spherical spreading
- sound absorption
- multiple reflections
- Lloyds mirror effect
- multiple reflections
- ray tracing
Unit 3. SIGNALS AND NOISE (19 pages)
- signal duration
- sonar resolution
- noise
- noise in ocean
Unit 4. SONAR PARAMETERS (18 pages)
- source level
- cavitation
- source directivity
- hydrophone response and directivity
- in-beam, in-band noise
- sonar targets
Unit 5. HYDROPHONES AND CONTINOUS ARRAYS (23 pages)
- electrical model for hydrophone
- hydrophone parameters
- preamplifier
- linear array
- directivity function and beam shading
- circular arrays
- rectangular arrays
- side-looking sonar
Unit 6. DISCRETE ARRAYS (13 pages)
- linear point array
- product theorem
- beam shading
- Dolph-Chebyshev beam-forming
- beam steering
- linear array with finite elements
Unit 7. REVERBERATION (16 pages)
- volume scattering
- surface back-scatter
- ocean surface
- bottom surface
- range calculation for side-looking sonars
Unit 8. ACOUSTIC TRANSDUCERS (21)
- hydrophone made of PVDF
- charge amplifier
- hydrophone made of PZT ceramic
- acoustic projectors
- equivalent circuit
- efficiency
Unit 9. APPLICATIONS (7 pages)
- multi-beam bathymetry
- navigation and positioning
- Doppler measurements
- communication
Total pages: 142