Title:
PRESSURE CONVERTER
Document Type and Number:
WIPO Patent Application WO/2003/012385
Kind Code:
A1
Abstract:
A pressure converter insusceptible to the error of hydraulic pressure introducing position or the interference of installation depth of water and producing a signal corresponding to the effective soil pressure accurately while realizing cost reduction. Since filters (34, 35) are provided in an air gap (10) defined by two rigid plates (13, 14) receiving the soil pressure, a hydraulic pressure is applied but sand pressure is not applied. A load gauge (41) insensitive to the hydraulic pressure detects only the effective soil pressure. Since a signal cable (51) can be passed through the air gap (10), a plurality of pressure converters (1, 2) can be coupled efficiently and since the signal cable (51, 52) can be inserted internally, a pressure distributed in the depth direction can also be measured accurately.
Inventors:
MAENO YOSHIHIKO (JP)
YABE KOICHI (JP)
YABE KOICHI (JP)
Application Number:
PCT/JP2002/002375
Publication Date:
February 13, 2003
Filing Date:
March 13, 2002
Export Citation:
Assignee:
EDUCATIONAL FOUNDATION NIHON U (JP)
MAENO YOSHIHIKO (JP)
YABE KOICHI (JP)
MAENO YOSHIHIKO (JP)
YABE KOICHI (JP)
International Classes:
E02D1/00; E02D1/02; G01L5/00; G01L7/00; G01L19/00; (IPC1-7): G01L5/00; E02D1/00
Foreign References:
| JPH05187939A | 1993-07-27 | |||
| JP2000065656A | 2000-03-03 |
Other References:
See also references of EP 1420236A4
Attorney, Agent or Firm:
Sanada, Syuji (4-17 Akasaka 6-chom, Minato-ku Tokyo, JP)
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