Pressure sensor and soil stress isolation filter arrangement in

Details Pressure sensor and soil stress isolation filter arrangement in Pressure sensor and soil stress isolation filter arrangement in

1982-03-12

1984-06-12

Frankfort, Charles

Measuring and testing

Moisture content or absorption characteristic of material

73754, G01L 1100, G01N 3324

Patent

active

044534019

ABSTRACT:
A system for measuring transient pore water pressure in the ground utilizes a probe member having a unique arrangement of a pressure sensor and a soil stress isolation filter. The probe member has a body portion with a hollow cavity defined therein. The pressure sensor in the form of a ceramic transducer is mounted in the cavity, and the filter in the form of a circumferential gap formed on the body communicates with the cavity. The filter is also configured for isolating the sensor from effective soil fabric stresses while allowing access to the transducer by pore water pressure. A coupling medium in the form of silicon grease fills the cavity so as to transmit the pore water pressure to the transducer.

REFERENCES:
patent: 2259867 (1941-10-01), Webster
patent: 2459268 (1949-01-01), Elkins
patent: 3031591 (1962-04-01), Cary
patent: 3318140 (1967-05-01), Shields et al.
patent: 3374664 (1968-03-01), Lefelhocz et al.
patent: 3456509 (1969-07-01), Thordarson
patent: 4332172 (1982-06-01), Torstensson
patent: 4408481 (1983-10-01), Sidey

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