Title:
【発明の名称】歪検知装置
Document Type and Number:
Japanese Patent JP3143476
Kind Code:
B2
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.
Inventors:
Saxophone, Iber, S.
Application Number:
JP51735497A
Publication Date:
March 07, 2001
Filing Date:
October 21, 1996
Export Citation:
Assignee:
Carnegie Institution of Washington
International Classes:
E21B49/00; G01B5/30; G01B7/16; G01C7/02; G01B13/24; G01D5/06; G01D21/00; G01L1/02; (IPC1-7): G01D21/00; G01B13/24; G01D5/06
Domestic Patent References:
| JP483854A | ||||
| JP57165710A | ||||
| JP62111613U |
Other References:
【文献】米国特許3635075(US,A)
Attorney, Agent or Firm:
Akira Asamura (3 outside)