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随着天然气管道铺设的增多、输气压力的增大,用气管道的安全运行成为人们普遍关心的问题。随着管道腐蚀缺陷的无损检测技术的发展,天然气管道的检测技术也逐步向更有效、准确的检测方向发展。本文分析了目前长输天然气管道裂缝探测技术的特点和发展方向,着重分析了电磁超声、远场涡流、漏磁探测技术的优缺点,探讨了采用电磁超声、远场涡流、漏磁探测技术在天然气长输管道裂缝探索裂纹缺陷定量评价方法的重要性。 相似文献
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We studied the infrared transmission properties of gold films on ordered two-dimensional nonclose- packed polystyrene (PS) colloidal crystal. The gold films consist of gold half-shells on the PS spheres and gold film with 2D arrays of holes on the glass substrate. An extraordinary optical transmission phenomenon could be found in such a structure. Simulations with the finite-difference time-domain method were also employed to get the transmission spectra and electric field distribution. The transmission response of the samples can be adjusted by controlling the thickness of the gold films. Angle-resolved measurements were performed using polarized light to obtain more information about the surface plasmon polariton resonances of the gold films. As the angle changes, the transmission spectra change a lot. The transmission spectra of p-polarized light have quite different properties compared to those of s-polarized light. 相似文献
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