Title:
UNDERGROUND STREAM MEASURING DEVICE
Document Type and Number:
Japanese Patent JP3880729
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an underground stream measuring device capable of accurately measuring an underground stream without being affected by the shape and material of a screen located on the outside of a measurement case.
SOLUTION: This underground stream measuring device is provided with a measurement case having a flow section where underground water can flow, an air pipe 7 feeding air into the measurement case, a measurement section (lower case 5) provided in the measurement case and surrounded by an electric insulator around it, a float 2 made of the electric insulator and arranged floatably between the flow section and measurement section in the measurement case, and two pairs of electrodes X1, X2 and (Y1), (Y2) are arranged on the X-axis and Y-axis on the X, Y plane on the cross sectional plane of the measurement section on the inner periphery of the measurement section. The float 2 is set to the floating state in the measurement case at the time of measurement, measurement is started from the centered state, a current is fed from a constant-current circuit to two electrodes on the X-axis and two electrodes on the Y-axis in the measurement section in turn, and current values obtained from two electrodes on the Y-axis and two electrodes on the X-axis are detected.
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Inventors:
Genji Yonezawa
Murayama Go
Keiji Terachi
Tamoshikoshi
Murayama Go
Keiji Terachi
Tamoshikoshi
Application Number:
JP22481098A
Publication Date:
February 14, 2007
Filing Date:
August 07, 1998
Export Citation:
Assignee:
Toho Chisui Co., Ltd.
International Classes:
G01V9/02; G01P13/00; (IPC1-7): G01V9/02
Domestic Patent References:
| JP7072264A | ||||
| JP7333353A | ||||
| JP8105910A |
Attorney, Agent or Firm:
Akio Iida