The study of a magnetic fluid-based sensor

Cotae, C.; Baltag, Octavian; Olaru, Radu; Calarasu, D.; Costandache, D.

doi:10.1016/s0304-8853(99)00110-9

Cited by 21 publications

(9 citation statements)

References 1 publication

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“…A magnetic fluid is a kind of stable colloidal dispersion of finely divided single-domain ferromagnetic nanoparticles in a suitable liquid carrier that shows controllable rheological characteristics under an applied electromagnetic field [5]. Important applications include magnetic fluid sensors, such as the magnetic fluid tilt sensor [6], the sensor for very low gas flow rate measurement [7], the capacitive transducer [8], and the magnetic field sensor [9,10]. It has been discovered that the magnetic particles will cluster when the applied electromagnetic field is increased to a certain value, resulting in the variation of the magnetic fluid's refractive index [11,12].…”

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confidence: 99%

Fiber magnetic-field sensor based on nanoparticle magnetic fluid and Fresnel reflection

et al. 2011

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A simple fiber sensor for magnetic field measurement based on nanoparticle Fe(3)O(4) magnetic fluid and relative Fresnel reflection is presented. The sensor includes only a light source, three couplers, two photodetectors, and two fiber sensing ends. Magnetic fields at different concentrations of magnetic fluid are measured. Magnetic fluid with high concentration can be used for the measurement of weak magnetic fields, while low concentration fluid is used for the measurement of strong magnetic fields. The temperature dependence of the sensor is also addressed.

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confidence: 99%

Fiber magnetic-field sensor based on nanoparticle magnetic fluid and Fresnel reflection

et al. 2011

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“…As H e increases, α and α ⊥ should tend to 0 and 1.5, respectively, which is indicative of the formation of more and more particle chains, as evident in experiments. A crude estimate of α can be obtained from the contribution of chains, namely, α = 1 φ n k=1 kV 0 V k (H e )N k , where φ denotes the volume fraction of the structured particles in the suspension, N k the depolarization factor for a chain with k structured particles, V 0 the volume of one particle in suspension (considered to be spherical and all identical), and V k (H e ) the density of the chain, which is a function of H e [36,37]. It is noteworthy that, for given p, V k (H e ) also depends on the dipolar coupling constant which relates the dipole-dipole interaction energy of two contacting particles to the thermal energy.…”

Section: Formalismmentioning

confidence: 99%

Optical properties in one-dimensional graded soft photonic crystals with ferrofluids

Fan

Wang

Zhu

et al. 2013

J. Opt.

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We theoretically investigate the optical properties in one-dimensional graded soft photonic crystals (1D GSPCs). The proposed structure is constituted of the stacked ferrofluids layer and the dielectric layer. Due to the supermagnetic response of the ferromagnetic nanoparticles, they will align in a line under the influence of the initiated magnetic field, thereby modulating the refractive index of the ferrofluids layer. By resorting to the transfer matrix method, the dispersion relation, transmittance and reflectance in 1D GSPCs were calculated. Numerical results show that a broad photonic band gap appears in such systems, which can even be broadened by increasing the volume fraction of ferromagnetic nanoparticles. Moreover, perfect transmittance of our proposed structure can be realized with an increased number of ferrofluid layers. In comparison with conventional PCs materials, 1D GSPCs composed of liquid material offer a very flexible route to implementation, which can be widely used in the application of optical filters, waveguides, reflectors and so on.

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“…As H e increases α and α ⊥ should tend to 0 and 1.5, respectively, which is indicative of the formation of more and more particle chains as evident in experiments. So a crude estimate of α can be obtained from the contribution of chains, namely α = 1 φ n k=1 kV 0 V k (H e )N k , where φ denotes the volume fraction of the structured particles in the suspension, N k the depolarization factor for a chain with k structured particles, V 0 the volume of one particle in suspension (considered to be spherical and all identical), and V k (H e ) the density of the chain which is a function of H e [37,38]. It is noteworthy that for a given p, V k (H e ) also depends on the dipolar coupling constant which relates the dipole-dipole interaction energy of two contacting particles to the thermal energy.…”

Section: Formulismmentioning

confidence: 99%

Optical properties in the soft photonic crystals based on ferrofluids

Fan

Liang

2011

J. Phys. D: Appl. Phys.

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We theoretically investigate the properties of optical propagation in one-dimensional soft photonic crystals based on ferrofluids using the transfer matrix method. The proposed structure is composed of an alternating ferrofluid layer and a dielectric layer. Ferrofluids are composed of suspended ferromagnetic nanoparticles coated with silver, which has a frequency-dependent dielectric function. Core-shell nanocomposites incorporating an optical signature with magnetic response are particularly useful. The calculated results of dispersion relation show that tunable band gaps can be realized by varying the local magnetic field factor α, the shell thickness parameter t, or the filling fraction ν of the ferrofluid layer. An additional band gap appears in the lower frequency region due to the absorption. These band gaps blue shift when the external magnetic field is enhanced, and red shift when either t or ν is increased. We also extend our analysis to the variation of band width. To meet the requirements of optical devices, such a tunable structure can be used to design optical filters, modulators and waveguides.

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The study of a magnetic fluid-based sensor

Cited by 21 publications

References 1 publication

Fiber magnetic-field sensor based on nanoparticle magnetic fluid and Fresnel reflection

Fiber magnetic-field sensor based on nanoparticle magnetic fluid and Fresnel reflection

Optical properties in one-dimensional graded soft photonic crystals with ferrofluids

Optical properties in the soft photonic crystals based on ferrofluids

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