International Journal of Applied Electromagnetics and Mechanics - Volume 25, issue 1-4

Authors: Chiriac, Horia | Herea, Dumitru-Daniel

Article Type: Research Article

Abstract: A giant-magnetoimpedance-based biosensor prototype was designed and tested by using simple glass-coated amorphous microwires and copolymer-functionalized glass-coated amorphous microwires as sensing elements, as well as two different types of magnetic microparticles as perturbating agents for the external d.c. magnetic field. The influence of the two types of microparticles and the geometry of the d.c. excitation external magnetic field on the magneto-impedance (MI) of the amorphous microwire have been studied. This type of …magnetic biosensor prototype will be useful in biomolecule detection techniques. Show more

Keywords: Magnetic sensor, magnetic markers, biomedical applications, GMI effect

DOI: 10.3233/JAE-2007-746

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 453-459, 2007

Authors: Varoneckas, Giedrius

Article Type: Research Article

Abstract: The role of heart rate (HR) variability as advanced sensoring method allowing to assess human functional state is presented. HR being derived from a single bio-signal (measured from RR intervals of one electrocardiogram lead) during different functional tests such as active orthostatic test, physical and mental loads, day-time activity or sleep stages offers a numerous physiologically relevant parameters. HR analysis methods are ascribed in time and frequency domains. Advanced sensoring using HR variability patterns …represents a patient-friendly monitoring method which in some cases may substitute multichannel obtrusive recordings of numerous physiological signals. Show more

Keywords: Heart rate, heart rate variability, power spectrum, Poincare plots, sleep stages, autonomic control, sensors

DOI: 10.3233/JAE-2007-747

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 461-467, 2007

Authors: Wang, Feng | Zou, Yanhui | Tanaka, Mami | Matsuda, Tadashi | Chonan, Seiji

Article Type: Research Article

Abstract: The development of an unconstrained sensing technique using PVDF films as sensory material for monitoring the heart beats and respiration of premature infants is reported. A sensor consists of a 1 × 4 array of PVDF films is developed. The sensor is placed on the bed to pick up the fluctuation of the pressure on the bed caused by the respiratory movement and heart beats of a premature infant. Wavelet multi-resolution decomposition is used for …simultaneous detection of heart beats and respiration. Simultaneous real-time detection of both the respiration and heartbeats has been verified through clinical experiments. Show more

Keywords: Premature infant, heart beat, respiration, monitor, PVDF, sensor, NICU

DOI: 10.3233/JAE-2007-751

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 469-475, 2007

Authors: Kosel, J. | Pfützner, H. | Traxler, S. | Kaniusas, E. | Mehnen, L. | Meydan, T. | Vazquez, M. | Rohn, M. | Merlo, A.M. | Marquardt, B.

Article Type: Research Article

Abstract: The study concerns a novel contactless sensor system based on a multifunctional magnetostrictive bilayer material. The permeability of the bilayer ribbons is sensitive either to bending or temperature. The higher order harmonics which are generated by the bilayer in response to a magnetic interrogation field are detected. Their amplitudes depend on the bilayer's permeability, hence on the quantity to be measured. The detection of the third harmonics proved to be most efficient. The sensor system enabled …contactless measurements with a distance up to 1 m using a bilayer of only 80 mm in length and 0.1 mm in thickness. Show more

Keywords: Sensors, magnetostriction, contact-less, multifunctional

DOI: 10.3233/JAE-2007-827

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 477-483, 2007

Authors: Mehnen, L. | Kaniusas, E. | Kosel, J. | Pfützner, H. | Meydan, T. | Vazquez, M. | Rohn, M. | Merlo, A.M. | Marquardt, B. | Sauermann, S.

Article Type: Research Article

Abstract: A novel sensor system is presented utilizing bending sensitive bilayers. The sensor system detects the contraction-dynamics of the upper femoral musculature during electric stimulation for diagnostics of muscle fibre recruitment and muscle twitch-dynamics in functional electrical stimulation.

Keywords: Amorphous, magnetostriction, bimetal, bending sensor, functional electrical stimulation

DOI: 10.3233/JAE-2007-842

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 485-488, 2007

Authors: Praslička, Dušan | Mikita, Ivan

Article Type: Research Article

Abstract: Relax-type magnetometer is a simple variety of fluxgate family magnetometers, comprising high permeability non-linear core of sensing coil gathering and gating ambient magnetic field. This is to be a report on basic theory of operation and some novel research on metrological qualities.

Keywords: Engineering instruments, magnetic instruments, fluxgate magnetometer, relax-type fluxgate, industrial instruments, iron detectors, conveyor belt protection

DOI: 10.3233/JAE-2007-752

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 489-493, 2007

Authors: Okuyama, Takeshi | Yakuwa, Kumiko | Luo, Yun | Higa, Masaru | Takagi, Toshiyuki

Article Type: Research Article

Abstract: In this work a manipulator made of a shape memory alloy (SMA) and driven by thermoelectric modules is described. The mechanical output of the manipulator is obtained during the phase transformation of the SMA. To control the mechanical output, the relation between the transformation and the deformation of the SMA has to be determined. In this paper, a phenomenological model is proposed to predict the mechanical behavior of the SMA manipulator. Its validity is confirmed by …a comparison of the deformation results between the numerical simulation and experiments. Show more

Keywords: Shape memory alloy, phase transformations, manipulator, thermoelectric module, two-way shape memory effect

DOI: 10.3233/JAE-2007-856

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 495-501, 2007

Authors: Nagata, Shoichiro | Enokizono, Masato | Chady, Tomasz | Sikora, Ryszard

Article Type: Research Article

Abstract: The validity of a new eddy-current-based damage detection technique was investigated. The Multi-Frequency Excitation and Spectrogram method (MFES) using Hall element sensor array was employed. Hall sensors positioned between the excitation yoke legs picked up leakage flux density in proportion to the excitation frequency. This new sensor configuration may be effective in the evaluation of magnetic properties such as permeability or conductivity. In order to unveil the phenomenon, finite element analyses are performed.

Keywords: Multi-Frequency Excitation and Spectrogram Method (MFES), skin depth, Finite Element Method (FEM)

DOI: 10.3233/JAE-2007-753

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 503-509, 2007

Authors: Honda, Takashi | Yoshida, Aiko | Yamasaki, Jiro

Article Type: Research Article

Abstract: A novel micropump using oscillation of an elastic film has been proposed for medical applications. The shape of the pump is a cylinder with outside diameter of 4 mm and length of 29 mm. The moving part of the pump is an angular oscillator composed of a magnet and an elastic film. When external alternating magnetic fields are applied, the magnet oscillates due to magnetic torque and then the elastic film can generate flow. The prototype micropump …exhibited the maximum flow rate of approximately 100 ml/min. Show more

Keywords: External magnetic field, implantable device, magnet, micropump

DOI: 10.3233/JAE-2007-871

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 511-516, 2007

Authors: Lin, Zhi Wei | Zhu, Jian Guo | Guo, You Guang | Zhong, Jin Jiang | Lu, Hai Wei

Article Type: Research Article

Abstract: One and two-dimensional hysteresis properties are normally used to characterize soft magnetic materials. However, the results are not informative enough to disclose three-dimensional (3-D) hysteresis behavior under vector excitations. This paper presents a 3-D sensing house for measuring the 3-D property of soft magnetic materials. The fabrication, construction, and calibration are discussed in detail. Test results of 3-D magnetic flux density B and field strength H loci of soft magnetic composite material are …presented. Show more

Keywords: 3-D magnetic property, vector hysteresis loci, B and H search coils

DOI: 10.3233/JAE-2007-754

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 25, no. 1-4, pp. 517-520, 2007