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一台青羊35DZ—2黑白电视机易出现场幅变小或伸缩不定的故障。经检测电源及行扫描电路、场输出电路均正常时,可判断故障在1150V中压整流至MC13007的(20)脚之间。将3R_4(4.7MΩ)去掉,用一固定 相似文献
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Based on the theory of fiber Bragg grating sensing, and using a 2 m plane stress material model of the simulation experiment,
the wavelength shift regulations of fiber Bragg gratings under rock settlement deformation conditions were got, which provided
reliable basis for the design of the wavelength bandwidth of sensing gratings. The wavelength increase when the rock layers
are under tension, and decrease under compression. Compressive strain sensitivity is bigger than tensile strain sensitivity
when the load is lower. However compressive strain sensitivity is smaller than tensile strain sensitivity when the load is
higher. Experimental result coincides well with theory. The wavelength bandwidth of two neighboring fiber Bragg gratings of
the gratings used for monitoring the deformation of rock layer should be no less than 6 nm. An effective new approach for
detecting the deformation of rock settlement with fiber Bragg gratings is provided.
Supported by the National Natural Science Foundation of China(50775060) 相似文献
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