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Time-Coded GMI Magnetic Field Sensor
Xuan-Huu Cao,Derac Son 한국자기학회 2009 Journal of Magnetics Vol.14 No.3
A time-coded giant magnetoimpedance (GMI) magnetic field sensor was investigated and designed. The successfully constructed and tested laboratory model demonstrated a sensitivity of 5 ㎲/μT in the field range of ±200 μT. The sensing element in the form of an amorphous thin wire, 100 ㎜ in diameter ×50 ㎜ long, was fit into a small field modulation coil of 60 ㎜ length. At a magnetic field modulation in the range of hundreds of ㎐, the change in time interval of two adjacent GMI voltage peaks was linearly related to the external magnetic field to be measured. This mechanism improved the sensor linearity to better than 0.3% in the measuring range of ±200 μT.
Xuan Thang Cao,ALIMD SHOWKAT,Long Giang Bach,정연태,김종수,임권택,제갈영순 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1
Photoluminescent hybrids of poly("-caprolactone) (PCL), polyhedral oligosilsesquioxane (POSS)and terbium ions (Tb3+) were synthesized by using a combination of ring-opening polymerization(ROP), click chemistry and coordination chemistry. Initially, acetylene functionalized PCL (alkyne-PCL-COOH) was prepared by using ROP of "-caprolactone with propargyl alcohol, and azidesubstitutedPOSS (POSS-N3) was prepared by using the reaction of chloropropyl-heptaisobutylsubstitutedPOSS with NaN3. The click reaction between alkyne-PCL-COOH and POSS-N3 affordedPOSS-g-PCL, which was subsequently coordinated with Tb3+ ions in the presence of 1,10-phenanthroline to produce POSS-g-PCL-Tb3+-Phen. The structures and compositions of the hybridswere investigated by using 1H nuclear magnetic resonance (NMR), Fourier-transform infraredspectroscopy (FT-IR), Field emission scanning electron microscope (FE-SEM), Transmission electronmicroscopy (TEM), and Thermogravimetric analysis (TGA). The optical properties of POSSg-PCL-Tb3+-Phen complexes were characterized by using photoluminescence spectroscopy, whichshowed four high emission bands centered at 489, 545, 584, and 620 nm with excitation at 330 nm. The emission spectra of the europium-ion-coordinated hybrids, POSS-g-PCL-Eu3+-Phen, had fourhigh-intensity peaks, 594, 617, 652 and 686 nm, for an excitation wavelength of 352 nm.