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Title:
DRAFT (DEPTH) MEASURING INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2005/057143
Kind Code:
A1
Abstract:
Visual measurement of a vertically varying draft average value generally includes a personal error and lacks objectivity. The measurement system of the invention using conductivity of the seawater or freshwater enables fast objective measurement of the average value. A leakage circuit sensor with a simple robust structure comprises a hexadecimal number of electrodes arranged parallel and vertically in a tube. The sensor is suspended along a draft indicator of the ship-side outside plate. A DC current is applied to the sensor, and the current flows through the electrodes under water to detect the sea level. By using such sensors, the drafts varying with waves and wind are measured at a plurality of places in a predetermined time. Thus, various variations such as of the draft average value, wave period/amplitude, and hull pitching/rolling period/amplitude are determined.

Inventors:
Aoki, Shigeru (41-1-306, Nishi-Kameari 2-chome Katsushika-ku, Tokyo, 124-0002, JP)
Application Number:
PCT/JP2003/015723
Publication Date:
June 23, 2005
Filing Date:
December 09, 2003
Export Citation:
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Assignee:
Aoki, Shigeru (41-1-306, Nishi-Kameari 2-chome Katsushika-ku, Tokyo, 124-0002, JP)
International Classes:
B63B9/08; B63B35/00; B63B39/12; G01C13/00; G01F23/24; (IPC1-7): G01F23/24; B63B35/00; G01C13/00
Foreign References:
JP2003090753A
JPH09126766A
JPH1183593A
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