Electromagnetic interference response

Fiber optic chemical and biological sensors, based on SPR in continuous metallic films deposited on optical fibers, have been previously reported. " Sensors based on optical fibers have advantages like high response times, ability to be remotely interrogated, and low electromagnetic interference. In our study, fiber optic devices were developed based on excitation of LSPs in gold nanoparticles, deposited on the surface and tip of different optical fiber stractures. As refractive index of the medium around the sensors was varied, or biological molecules attached to the nanoparticles, a shift in the plasmon resonance related dip in the transmission spectram was observed. 

The sources of electromagnetic interference issue of electromagnetic energy transmitted through the intermediary channel to the interference energy sensitive receiver, the receiver shall exhibit some form of response , and the effect of interference. (shown in Figure 1)... 

P. Salni, V. Choudhary, Structural Details, Electrical Properties, and Electromagnetic Interference Shielding Response of Processable Copolymers of Aniline. /. Mater. Sci. 2013,48,797-804. 

P. Saini, V. Choudhary, N. Vijayan, R. K. Kotnala, Improved Electromagnetic Interference Shielding Response of Poly(Aniline)-Coated Fabrics Containing Dielectric and Magnetic Nanoparticles. J. Phys. Chem. C 2012, 116, 13403-13412. 

P. Saini, M. Arora, G. Gupta, B. K. Gupta, V. N. Singh, V. Choudhary, High Permittivity Polyaniline-Barium Titanate Nanocomposites with Excellent Electromagnetic Interference Shielding Response. Nanoscale 2013, 5, 4330. 

J. Joo, C. Y. Lee, High Frequency Electromagnetic Interference Shielding Response of Mixtures and Multilayer Films Based on Conducting Polymers. 7 Appl Phys 2000,88, 513. 

Ferrites represent the most widespread technological solution to reduce electromagnetic interference (EMI), because they allow the directly induced noise to be filtered. These ferrimagnetic ceramics produce magnetic flow density in response to small magnetization forces applied. Currently, ferrites used for EMI suppression above 30 MHz are composed of mixtures of oxides of iron,... 

Electrical performance failures can be caused when individual components have incorrect resistance, impedance, voltage, current, capacitance, or dielectric properties or by inadequate shielding from electromagnetic interference (EMI) or particle radiation. The failure modes can be manifested as reversible drifts in electrical transient and steady-state responses such as delay time, rise time, attenuation, signal-to-noise... 

Figure 1 shows schematically the general architecture of emergency response network. The information is transmitted between control centre and alarm indicator columns via fibre optic cable. The rationale for using that technology is its resilience to environmental electromagnetic interference (Duer Zajkowski Duer Pas 2012, Pas Duer 2012) and high data transfer speeds. The... 

Joo, J. and Lee, C.Y. (2000) High frequency electromagnetic interference shielding response of mixtures and multilayer films based on conducting polymers./oumoJ of Applied Physics, 88, 513-518. 

In general one would expect similar degrees of invulnerability to most hazards from either solution. The one significant exception is in die area of electromagnetic interference. The PLC system is potentially the most susceptible approach. However, adequately resistant equipment can be purchased, which when employed in suitable enclosures will continue to function even when subjected to this hazard. In either case, the typical response to hazards is to design and qualify (i.e. test) against them. 

Optical fiber detectors (OFD) are devices that measure electromagnetic radiation transmitted through optical fibers to produce a quantitative signal in response to the chemical or biochemical recognition of a specific analyte. Ideally, an OFD should produce a specific and accurate measurement, continuously and reversibly, of the presence of a particular molecular species in a given sample medium. Additionally, OFD should pro vide maximum sensitivity and minimal interferences fromsuperfluous ions or molecules to obtain low detection limits. Other attractive features include the miniaturization of the fiber s tip to accommodate single-cell analysis and portable instrumentation to allow in situ analysis. 

The combination of light-transmitting optical cable and miniature silicon sensors has resulted in the development of a new measurement technology for various industrial processes. Three variables may be measured with tins technique—temperature, pressure, and refractive index. The new systems are immune to electromagnetic and radio-frequency interference, they provide more accuracy in electrically noisy environments, and their miniature size improves response and causes minimal process disturbances. 

---