WATER BARRIER SHEET HAVING LEAK DETECTING FUNCTION, AND METHOD FOR DETECTING LEAK OF WATER BARRIER SHEET

PURPOSE:To prevent the detection of a leak position from being in an impossible state by a disconnection, etc., and to surely detect the leak position, and safety detect a leak without using a high voltage. CONSTITUTION:The water barrier sheet 10 has two layers of a soft and long water barrier sheet...

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Bibliographic Details
Main Authors HARA TOSHIAKI, KURABAYASHI KIYOSHI
Format Patent
LanguageEnglish
Published 07.04.1995
Edition6
Subjects
COLORIMETRY
DISPOSAL OF SOLID WASTE
FIXED CONSTRUCTIONS
FOUNDATIONS
HYDRAULIC ENGINEERING
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL
METERING BY VOLUME
PERFORMING OPERATIONS
PHYSICS
RADIATION PYROMETRY
RECLAMATION OF CONTAMINED SOIL SOIL
SOIL SHIFTING
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
TRANSPORTING
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Summary:PURPOSE:To prevent the detection of a leak position from being in an impossible state by a disconnection, etc., and to surely detect the leak position, and safety detect a leak without using a high voltage. CONSTITUTION:The water barrier sheet 10 has two layers of a soft and long water barrier sheet, a heating layer formed between the two water barrier sheet layers with a material reacting with water to generate a heat being interposed, and an optical fiber temperature sensor 16 arranged on the heating layer in the longitudinal direction. A plurality of water barrier sheets are watertightly connected to each other in the cross direction and laid in a cavity formed on the ground surface, a laser pulse beam 100 is made incident from the incident end of each optical fiber temperature sensor 16 in the water barrier sheets, the rear scattered light 110 returned to the incident end by the rear scattering of the incident laser pulse beam is detected, the generating position of the rear scattered light is detected from the time until the rear scattered light is returned to the incident end, and the temperature of the point in which the rear scattered light 110 is generated is detected by a Raman scattered light 120 contained in the rear scattered light.
Bibliography:Application Number: JP19930264386