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METHOD FOR ESTIMATING SEWAGE PIPE INFILTRATING WATER INFLOW LOCATION, INFLOW TIME, AND THE LIKE, AND INVESTIGATION SYSTEM THEREFOR
PROBLEM TO BE SOLVED: To provide an estimation method and the like, capable of simply and efficiently grasping information such as a sewage pipe infiltrating water inflow location and inflow time on the basis of measurement data acquired from an optical fiber cable laid in a sewage pipe.SOLUTION: An estimation method includes: a measurement step of receiving scattered light generated depending on a temperature situation when laser light is made to be incident in an optical fiber cable and acquiring first measurement data on temperature corresponding to each time from measurement start reference time and each position from a measurement start reference position; a first data processing step of performing coordinate conversion on data part, of the first measurement data, shown using a time and position coordinate system and performing processing of integrating, with time, the data part on temperature after the conversion; and a position estimation step of calculating each difference value obtained by subtracting, from a value of each position in a time integration value on temperature, a value of a position immediately prior to the position and estimating a position corresponding to a large difference value in high rank order in magnitude order in a predetermined range of respective difference values, as an inflow position of sewage pipe infiltrating water.SELECTED DRAWING: Figure 1
【課題】下水道管内に布設した光ファイバーケーブルから得られる測定データに基づいて下水道管浸入水の流入箇所、流入時間等の情報を簡易にかつ効率よく把握できる推定方法等を提供する。【解決手段】推定方法は、上記光ファイバーケーブルにレーザ光を入射させたときに温度の状況に応じて発生する散乱光を受光し、測定開始の基準時刻からの各時刻および測定開始の基準位置からの各位置に対応した温度の第１測定データとして得る測定工程と、第１測定データのうち時刻および位置の座標系で示すデータ部分を座標変換し、その変換後の温度のデータ部分を時間で積分する処理を行う第１データ処理工程と、温度の時間積分値における各位置の値からその各位置の１つ手前位置の値を差し引いた各差分値を算出し、その各差分値のうち大小の順位が所定範囲の上位順になる大きい差分値に該当する位置を下水道管浸入水の流入位置として推定する位置推定工程とを有する。【選択図】図１
METHOD FOR ESTIMATING SEWAGE PIPE INFILTRATING WATER INFLOW LOCATION, INFLOW TIME, AND THE LIKE, AND INVESTIGATION SYSTEM THEREFOR
PROBLEM TO BE SOLVED: To provide an estimation method and the like, capable of simply and efficiently grasping information such as a sewage pipe infiltrating water inflow location and inflow time on the basis of measurement data acquired from an optical fiber cable laid in a sewage pipe.SOLUTION: An estimation method includes: a measurement step of receiving scattered light generated depending on a temperature situation when laser light is made to be incident in an optical fiber cable and acquiring first measurement data on temperature corresponding to each time from measurement start reference time and each position from a measurement start reference position; a first data processing step of performing coordinate conversion on data part, of the first measurement data, shown using a time and position coordinate system and performing processing of integrating, with time, the data part on temperature after the conversion; and a position estimation step of calculating each difference value obtained by subtracting, from a value of each position in a time integration value on temperature, a value of a position immediately prior to the position and estimating a position corresponding to a large difference value in high rank order in magnitude order in a predetermined range of respective difference values, as an inflow position of sewage pipe infiltrating water.SELECTED DRAWING: Figure 1
【課題】下水道管内に布設した光ファイバーケーブルから得られる測定データに基づいて下水道管浸入水の流入箇所、流入時間等の情報を簡易にかつ効率よく把握できる推定方法等を提供する。【解決手段】推定方法は、上記光ファイバーケーブルにレーザ光を入射させたときに温度の状況に応じて発生する散乱光を受光し、測定開始の基準時刻からの各時刻および測定開始の基準位置からの各位置に対応した温度の第１測定データとして得る測定工程と、第１測定データのうち時刻および位置の座標系で示すデータ部分を座標変換し、その変換後の温度のデータ部分を時間で積分する処理を行う第１データ処理工程と、温度の時間積分値における各位置の値からその各位置の１つ手前位置の値を差し引いた各差分値を算出し、その各差分値のうち大小の順位が所定範囲の上位順になる大きい差分値に該当する位置を下水道管浸入水の流入位置として推定する位置推定工程とを有する。【選択図】図１
METHOD FOR ESTIMATING SEWAGE PIPE INFILTRATING WATER INFLOW LOCATION, INFLOW TIME, AND THE LIKE, AND INVESTIGATION SYSTEM THEREFOR
下水道管浸入水の流入箇所、流入時間等の推定方法およびその調査システム
FUJIKI OSAMU (author) / NIIBO TAKAYUKI (author) / FUJIWARA FUMIAKI (author) / KOSHIISHI HIROYUKI (author) / IMAI SATOSHI (author) / KUBOTA SHUNSUKE (author)
2018-05-31
Patent
Electronic Resource
Japanese
IPC:
E03F
SEWERS
,
Abwasserkanäle
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