Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Earth stresses
Patent
1996-10-16
1998-04-14
Dougherty, Elizabeth L.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Earth stresses
73783, G01B 500, G01B 716, G01L 100, G01N 3324
Patent
active
057394350
ABSTRACT:
A device for detecting deformations in solids includes a casing constructed and arranged to be insertable in a solid. The casing has walls defining a substantially closed container. The container has an inner dividing wall separating the container into an upper enclosed section and a lower enclosed section. A fluid substantially fills the lower enclosed section and is in fluid communication with the interior walls of the lower enclosed section. A first strain-sensing system is in fluid communication with the lower enclosed section of the container such that deformation of the walls causing pressure changes in the fluid are detected by the first strain-sensing system. A second strain-sensing system is disposed in the upper enclosed section. The upper enclosed section is at least partially filled with fluid. A valve fluidly couples the second strain-sensing system to the lower enclosed section. The valve is operatively associated with the first strain-sensing system and is normally closed, preventing fluid in the lower section from communicating with the second strain-sensing system. The valve is constructed and arranged to open in response to a signal sent from the first strain-sensing system when the first strain-sensing system reaches an operating limit of strain measurement, thereby protecting the first strain-sensing system from being damaged from strains exceeding the operating limit thereof. The second strain-sensing system is constructed and arranged to measure the excessive strains.
REFERENCES:
patent: 3030037 (1962-04-01), Raetz
patent: 3155526 (1964-11-01), Klein
patent: 3251701 (1966-05-01), Klein
patent: 3635076 (1972-01-01), Sacks
patent: 4594899 (1986-06-01), Henke et al.
patent: 5517854 (1996-05-01), Plumb et al.
Carnegie Institution of Washington
Dougherty Elizabeth L.
Noori Max H.
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