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By John G. Webster (Editor)

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The designer must decide which characteristics are most important and must be retained and what characteristics are less important and can be sacrificed before finalizing the design. Oceanographic Instruments Common oceanographic instruments described in this text include conductivity meters, turbidity meters, salinometers, current meters, thermometers, pressure/depth meters, and acoustic sensors. Most of the sensors can be categorized as either acoustic or nonacoustic devices. Examples of acoustic sensors include hydrophones (underwater microphones), sidescan sonar, passive sonar, and so on, whereas magnetometers, gyroscopes, accelerometers, conductivity meters, and the like, represent the nonacoustic type.

Zhang L. E. Cross Theoretical study on the static performance of piezoelectric ceramic-polymer composites with 1–3 connectivity, J. Appl. , 72 (12): 5814–5821, 1992. Q. M. Zhang et al. Characterization of the performance of 1–3 type piezocomposites for low frequency applications, J. Appl. , 73 (3): 1403–1410, 1993. R. E. Newnham et al. Composite piezoelectric transducers, Mater. , 2: 93–106, 1980. T. R. Gururaja et al. in L. M. ), Electronic Ceramics, New York: Marcel Dekker, 1987, pp. 92–128. L.

3. Repeatability. The ability of an instrument to produce consistent output for same set of parameters 4. Ruggedness. The ability to withstand shocks and manhandling and be able continue to operate within specifications 5. Durability. The ability of an instrument to last a long time with minimum maintenance and still properly perform its intended functions 6. Convenience. The ability of an instrument to be fully functional with minimum attention from the operator. 7. Simplicity. The ability of an instrument to be easily used and maintained.

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