Pressure sensor and soil stress isolation filter arrangement in a pore pressure probe
US4453401A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | Mar 12, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.