Electromagnetic interference mechanism

Xingzhi Hu, Jikun Wang. Frequency devices. Electromagnetic interference mechanism of coal mine safety monitoring system [J] Journal of North China Institute of Science and Technology, 2013 (1) 83-85. (in Chinese). 

The spatial resolution of the CI SEM mode depends mainly on the electron-probe size, the size of the excitation volume, which is related to the electron-beam penetration range in the material (see the articles on SEM and EPMA), and the minority carrier diffusion. The spatial resolution also may be afiFected by the signal-to-noise ratio, mechanical vibrations, and electromagnetic interference. In practice, the spatial resolution is determined basically by the size of the excitation volume, and will be between about 0.1 and 1 pm ... 

Electromagnetic interference (EMI) refers to the interaction between electric and magnetic helds and sensitive electronic circuits and devices. EMI is predominantly a high-frequency phenomenon. The mechanism of coupling EMI to sensitive devices is different from that for power frequency disturbances and electrical transients. The mitigation of the effects of EMI requires special techniques, as will be seen later. Radio frequency interference (RFT) is the interaction between conducted or radiated radio frequency helds and sensitive data and communication equipment. It is convenient to include RFI in the category of EMI, but the two phenomena are distinct. 

M. H. Al-Saleh, U. Sundararaj, Electromagnetic Interference Shielding Mechanisms of CNT/Polymer Composites. Carbon 2009,47,1738-1746. 

Carbon Nanotube and Carbon Nanofiber Nanocomposites. The discovery of single-wall carbon nanotubes (SWNT) has renewed focus on composites with SWNT, multiwalled carbon nanotube (MWNT) and carbon nanofiber (CNF) reinforcements, together referred to as ID Nanocarbon composites (39). These constituents offer promise for new lightweight materials with incredible mechanical, electrical, and thermal properties. ID Nanocarbon materials are envisioned as multifunctional materials, eg single materials used for structures as well as electrical and/or thermal conductors. One example is electronics in a space satellite that need to be lightweight and mechanically supported, have the excess heat dissipated, and be protected from electromagnetic interference (EMI). Other examples are structures that are also batteries and structures that store hydrogen for fuel cells. 

Compared to the conventional mechanical and electrical/electronic humidity sensors, fiber-optic based humidity sensors [6, 14], including silica glass fiber and polymer optical fiber (POP) based sensors [28, 46], demonstrate many unique advantages, such as small size and low weight, immunity to electromagnetic interference, corrosion resistance, potentials for remote operation and distributed sensing. In fiber-optic sensor family, the fiber grating... 

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