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    • 4. 发明申请
    • METHOD AND APPARATUS FOR CRACK AND FRACTURE DETECTION UTILIZING BRAGG GRATINGS
    • 用于利用布拉格光栅进行裂缝和断裂检测的方法和设备
    • WO02052242A3
    • 2002-09-19
    • PCT/IB0102806
    • 2001-12-19
    • EUROP ECONOMIC COMMUNITYKENNY ROBERT PATRICKWHELAN MAURICE PATRICK
    • KENNY ROBERT PATRICKWHELAN MAURICE PATRICK
    • G01B11/00G01M11/00G01M11/08
    • G01M11/083
    • Methods, and corresponding apparatus, for detecting the occurrence of cracks or fractures are described and claimed. The methods utilize Bragg gratings, and the occurrence of a crack is detected by detecting a change in the reflectance and/or transmittance characteristics of the Bragg grating when the crack is transmitted to it. In addition to merely detecting that a crack has occurred, the methods may also provide information on the position of the fracture along the length of the Bragg grating. This may be achieved by comparing the peak intensities and/or widths of the optical reflectance spectra of the unbroken and broken grating. In certain preferred embodiments the Bragg gratings are interrogated using the combination of a broad band source and an optical spectrum analyser, or a tunable laser source and a broad band detector.
    • 描述并要求保护的用于检测裂缝或裂缝的发生的方法和相应的装置。 这些方法利用布拉格光栅,并且通过检测裂纹传播到布拉格光栅的反射率和/或透射率特性的变化来检测裂纹的发生。 除了仅检测到裂纹已经发生之外,这些方法还可以提供关于沿着布拉格光栅的长度的裂缝的位置的信息。 这可以通过比较不间断和破碎光栅的光学反射光谱的峰值强度和/或宽度来实现。 在某些优选实施例中,使用宽带光源和光谱分析仪,或可调谐激光源和宽带检测器的组合来询问布拉格光栅。