DEVICE AND METHOD FOR MEASURING OPTICAL FIBER STRAIN AND TEMPERATURE

To reduce the influence of ASE noise in BOTDR using a self-delay heterodyne interferometer.SOLUTION: The device for measuring optical fiber strain and temperature comprises: the averaging part for averaging a measurement signal obtained by self-delay heterodyne interference to generate averaged data...

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Bibliographische Detailangaben
Hauptverfasser:	KOIZUMI KENGO, YAMAGUCHI TOKURO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE PHYSICS TARIFF METERING APPARATUS TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Beschreibung
Zusammenfassung:	To reduce the influence of ASE noise in BOTDR using a self-delay heterodyne interferometer.SOLUTION: The device for measuring optical fiber strain and temperature comprises: the averaging part for averaging a measurement signal obtained by self-delay heterodyne interference to generate averaged data; a noise signal generation part for generating a noise signal on the basis of the averaged data; a subtracting part for subtracting the noise signal from the averaged data to generate a noise removal beat signal; and a Brillouin frequency shift calculation part for calculating a frequency shift amount from the noise removal beat signal and a local oscillation signal.SELECTED DRAWING: Figure 1 【課題】自己遅延ヘテロダイン干渉計を用いたＢＯＴＤＲにおいて、ＡＳＥノイズの影響を低減する。【解決手段】光ファイバ歪み及び温度測定装置は、自己遅延ヘテロダイン干渉により得られた測定信号を平均化して平均化データを生成する平均化処理部と、平均化データに基づいてノイズ信号を生成するノイズ信号生成部と、平均化データからノイズ信号を減算して、ノイズ除去ビート信号を生成する減算処理部と、ノイズ除去ビート信号と局発信号から周波数シフト量を算出するブリルアン周波数シフト算出部とを備える。【選択図】図１