Structure analysis and defect detection system
    1.
    发明授权
    Structure analysis and defect detection system 失效
    结构分析与缺陷检测系统

    公开(公告)号:US07027136B2

    公开(公告)日:2006-04-11

    申请号:US10605994

    申请日:2003-11-12

    IPC分类号: G01N21/00

    CPC分类号: G01B11/161

    摘要: A structure analysis and defect detection system in which a laser light source provides light via optical fiber to fiber Bragg gratings that change resonant frequency as stresses change in the structure. Light at the resonant frequencies of the fiber Bragg gratings is reflected and light of other frequencies is passed. The respective reflected light is directed through a Fabry-Perot interference filter or a fiber interferometer and detected by a photodetector. If the Fabry-Perot interference filter is used, the intensity of the reflected light indicates current stress at a fiber Bragg grating. If the fiber interferometer is used, a beat frequency due to heterodyne interference in the light indicates current stress at the respective fiber Bragg grating. Comparison data for the respective characteristic in the detected light over time permits stress analysis, and comparison of such data with pre-determined limit values permits defect or failure detection.

    摘要翻译: 一种结构分析和缺陷检测系统,其中激光光源通过光纤向光纤布拉格光栅提供光,当结构中的应力变化时,其改变谐振频率。 在光纤布拉格光栅的谐振频率处的光被反射并且其它频率的光通过。 相应的反射光被引导通过法布里 - 珀罗干涉滤光器或光纤干涉仪,并由光电检测器检测。 如果使用法布里 - 珀罗干涉滤波器,则反射光强度表示光纤布拉格光栅处的电流应力。 如果使用光纤干涉仪,则由于光中的外差干扰引起的拍频表示各个光纤布拉格光栅处的电流应力。 随着时间的推移,检测光中的各个特性的比较数据允许应力分析,并且将这些数据与预定极限值进行比较允许缺陷或故障检测。