Rogers, Peter H. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia.
Trivett, David H. George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia.
- Additional Readings
The underwater equivalent of a microphone, which generates an electrical signal as a response to the pressure component of an acoustic signal. Modern hydrophones are usually composed of piezoelectric ceramics such as barium titanate and lead zirconate titanate. The piezoelectric effect is the ability of materials to generate a voltage in response to applied mechanical stress. This effect is reciprocal in that an applied voltage will induce a small deformation in a piezoelectric material. Thus, some hydrophones can also be used as acoustic sources or projectors. In general, the capacitance of a hydrophone is relatively small, so a preamplifier is required to be placed near the piezoelectric material. The preamplifier boosts the electrical signal to allow the use of long cables without reducing the sensitivity of the hydrophone due to the added capacitance. When a preamplifier is installed in a hydrophone, the hydrophone is no longer reciprocal and may not be used as a projector. Hydrophone design requirements differ from microphones in that they must be electrically insulated from water and may need to operate at high hydrostatic pressure (deep depths). See also: Electret transducer; Microphone; Piezoelectricity; Preamplifier
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information