Fbg strain sensor system

Fbg歪センサシステム

Abstract

PROBLEM TO BE SOLVED: To provide an FBG strain sensor system for performing strain measurement on a measuring object accurately at a high speed even if an optical path length to an FBG is unknown, for example, while performing measurement on the path length to the FBG, by causing a variable wavelength light source to sweep back and forth to detect a difference of a wavelength shift caused by the difference in the sweeping directions. SOLUTION: The wavelength of a wave reflected by FBGs 13a to 13c is measured as the first assumed wavelength λ TU of a reflected wave based on an electric signal b outputted from a light receiver 14 and the wavelength of an oscillated wave of the variable wavelength light source 10 during a period when the light source 10 sweeps from short waves to long waves. The wavelength of the wave reflected by the FBGs 13a to 13c is measured as the second assumed wavelength λ TD of the reflected wave based on the electric signal b outputted from the light receiver 14 and the wavelength of the oscillated wave of the light source 10 during the period when the light source 10 sweeps from long waves to short waves. The wavelength λ F of the wave reflected by the FBGs 13a to 13c is found based on the first and second assumed wavelengths λ TU and λ TD and on the sweep characteristic of the oscillated wave of the light source 10. COPYRIGHT: (C)2007,JPO&INPIT
【課題】波長可変光源を往復掃引させ、その掃引方向の違いによって生じる波長ずれの差を検出することによって、例えFBGまでの光路長が不明な場合であっても測定対象の歪み測定を高速かつ正確に行えるとともに、FBGまでの光路長の測定をも可能にしたFBG歪センサシステムを提供する。 【解決手段】波長可変光源10が短波から長波へ掃引している期間に受光器14から出力される電気信号bと波長可変光源10の発振波長からFBG13a〜cの反射波長を第1の仮の反射波長λ TU として測定し、かつ、波長可変光源10が長波から短波へ掃引している期間に受光器14から出力される電気信号bと波長可変光源10の発振波長からFBG13a〜cの反射波長を第2の仮の反射波長λ TD として測定して、この第1の仮の反射波長λ TU 及び第2の仮の反射波長λ TD と波長可変光源10の発振波長の掃引特性とに基づいてFBG13a〜cの反射波長λ F を求める。 【選択図】図1

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    JP-2008014934-AJanuary 24, 2008Anritsu Corp, アンリツ株式会社Fbgセンサシステム
    JP-2015031595-AFebruary 16, 2015アンリツ株式会社, Anritsu Corp物理量測定システム及び物理量測定方法