The current domestic and abroad research status is discussed firstly, and the guided wave mode and exciting method used in pipeline crack detection is determined by disperse curve and wave structure.
首先，介绍了管道导波检测技术国内外的研究现状，然后利用频散曲线和波结构确定了管道裂纹检测所用的导波模态及激励方式。
Weak modulated dielectric grating can be equivalent to planar waveguide. When it diffracted high-order spatial sub-wave is coupled with waveguide mode, a guided mode resonance is formed.
弱调制介质光栅可等效为平板波导，经其衍射的高级次子波与波导模式耦合时，形成导模共振。
When guided mode resonance occurs, the incident wave parameters and grating parameters are very sensitive. It has a narrow-band effect and can be used to fabricate narrow-band filters.
导模共振对入射波参数和光栅参数极为敏感，具有窄带效应，可用来制作窄带滤波片。
When guided mode resonance occurs, the incident wave parameters and grating parameters are very sensitive. It has a narrow-band effect and can be used to fabricate narrow-band filters.
导模共振对入射波参数和光栅参数极为敏感，具有窄带效应，可用来制作窄带滤波片。
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