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Piezometer Probe Measurement Technology
出版ASTM International, 1990
URLhttp://books.google.com.hk/books?id=dUl9zgEACAAJ&hl=&source=gbs_api
註釋Deep-ocean piezometer probes were developed and extensively tested in the laboratory, hyperbaric chamber, and the Pacific Ocean Basin environment at ambient pressures of 1 to 545 atm. The probes are small diameter (8 mm) and utilize single sensor differential transducers to measure very slight changes in excess pore-water pressure caused by induced mechanical and thermal stresses in the surrounding sediment. Pore pressure increases can cause time-dependent changes in the physical and mechanical properties of the sediment and thus affect the integrity of the sediment's "isolation" capacity. A unique system design, which exposes the transducers' external and internal (line pressure) components to ambient hydrostatic pressures, permits the measurement of extremely small pressure changes with high sensitivity and precision. The pressure sensors exhibited excellent sensitivity and stability during deep-ocean simulated laboratory tests and in-situ systems performance tests.