By Slawomir Tumanski
Whereas magnetic units are utilized in a number of functions, the supply of updated books on magnetic measurements is kind of restricted. accumulating state of the art wisdom from details scattered through the literature, guide of Magnetic Measurements covers a large spectrum of subject matters touching on magnetic measurements. It describes magnetic fabrics and sensors, the checking out of magnetic fabrics, and functions of magnetic measurements. appropriate for experts in addition to readers with minimum wisdom of magnetic measurements, the e-book starts off with an easy-to-follow advent to the necessities of magnetic measurements. It then deals a complete evaluate of varied smooth magnetic fabrics, similar to smooth and difficult magnetic fabrics and skinny magnetic movies. The textual content additionally describes all ordinary magnetic box sensors, together with inductive, fluxgate, corridor, magnetoresistive, resonance, SQUID, magnetoelastic, and magnetooptical sensors. the ultimate chapters speak about the nondestructive trying out of fabrics and discover purposes regarding magnetic measurements, together with magnetic diagnostics in drugs, magnetoarcheology, and magnetic imaging. an intensive evaluation of magnetic measurements, this guide is helping readers navigate the occasionally impenetrable phrases of the sector. It additionally assists them within the quest to layout electromagnetic units in a more desirable approach.
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Extra info for Handbook of Magnetic Measurements (Series in Sensors)
In 1845, Faraday discovered that in optically transparent materials, the linearly polarized light changes the angle of polarization depending on the magnetic field B (magneto-optical Faraday effect). 60) where ν is the Verdet constant. 44). Similar effect appears when the magnetic field is perpendicular to the direction of the light. This effect is known as Voigt effect (analogous effect in liquids is known as Cotton–Mouton effect). In such cases, this phenomenon is more complex due to double refraction (birefringence)—as a result, transmitted light is polarized elliptically.
52) with resonance for ω = ω0. * Due to large difference of Larmor frequencies for both phenomenons, it is possible easy separation of both resonances—NMR and ESR. Generally, the ESR is used less frequently than the NMR because • It is limited to certain group of chemical compounds having unpaired electrons • It needs high-frequency microwave testing devices in GHz range, which is technically more demanding • The picture of spectral lines can be complicated and difficult to interpret due to the presence of two electron resonances (from electron rotation and orbital movement) and moreover it can be disturbed by nuclear resonance (hyperfine coupling) Methods of the analysis of the resonance are very similar to those used in the NMR with the difference being the use of microwave techniques—in the presence of polarizing, static magnetic field B0 is used the additional AC magnetic field B1, which is perpendicular to B0.
Ferromagnetic Materials—Structure and Properties, Academic Press, San Diego, CA, 1994. 33 Simplified mechanism of magnetostriction caused by domain wall movement. materials with large values of the magnetostriction— the most known is so-called giant magnetostrictive material Terfenol D, with saturation magnetostriction of about 2000 × 10−6. Because magnetostriction is strongly related to crystal symmetry, it is therefore an anisotropic effect and depends on direction of stress. 34 presents the magnetostriction on the magnetization determined for single crystal of iron.