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Liu W.D.,South China University of Technology | Sun Y.,Beijing Aerospace Times Optical electronic Technology Co.
Applied Mechanics and Materials

Ideal geometry is mainly represented by several parameters in traditional CAD system. Based on these parameters, ideal geometry can be dynamically constructed to build the entire CAD entity; however, the modeling of variated geometry by parameters is not included, and parametric representation for variated geometry is introduced in this paper; sets of parameters for different types of geometry variation are discussed. Based on parametric representation for variated geometry, the translation and orientation error of part that affected by the variation of geometry is calculated, the process for converting geometry error to parametric part location error is introduced. © (2014) Trans Tech Publications, Switzerland. Source

Ding M.,University of Southampton | Wang P.,Dublin Institute of Technology | Wang J.,Beijing Aerospace Times Optical electronic Technology Co. | Brambilla G.,University of Southampton
IEEE Photonics Technology Letters

A compact singlemode-multimode-singlemode fiber tip (SMST) refractive index sensor is demonstrated. Focused ion beam milling is exploited to have a clean fiber tip cut which is then coated by a layer of gold to increase reflection. An average sensitivity of 265 nm/RIU and a resolvable index change of 3.77 × 10-5 are obtained experimentally with a ∼ 2.94 μm diameter SMST. Because of its compactness, ease of fabrication, linear response, good sensitivity, easy connectivity to other in-fiber optical components, and low cost, this refractometer could find various applications in chemical and biological sensing. © 2013 IEEE. Source

Zhou L.,Huazhong University of Science and Technology | Fu Q.,Huazhong University of Science and Technology | Zhou D.,Huazhong University of Science and Technology | Xue F.,Huazhong University of Science and Technology | And 2 more authors.
Ceramics International

A multiferroic La0.7Ba0.3MnO3-BaTiO3 composite sample was prepared by the solid state method. The composite exhibits a ferroelectric feature (2Pr=10.52 μC/cm2, 2Ec=32.2 kV/cm) and weak ferromagnetic feature (2Mr=13.6 memu/g, 2Hc=60.5 Oe). More importantly magneto-electric coupling, as well as magneto-capacitance and magneto-impedance effects, was also observed. The average changes of the 2Pr and 2Ec were -21.1% and -9.2%, respectively, when a relatively low external magnetic field (H=200 Oe) was applied. The MC value was ~-1.9% at 1 MHz after the sample was magnetized. These ME effects were mainly originated from the coexistence of magnetostriction and magneto-resistance in LBMO. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Source

Hao L.B.,Huazhong University of Science and Technology | Hao L.B.,Beijing Aerospace Times Optical electronic Technology Co. | Fu Q.Y.,Huazhong University of Science and Technology | Zhou D.X.,Huazhong University of Science and Technology | And 3 more authors.
Journal of Materials Science: Materials in Electronics

Thick film BaTiO3 (BTO)-Ni composites were prepared on alumina substrates via a combined method of electrophoretic deposition (EPD) and screen printing technique. During the EPD process, a Ni/alumina substrate was used as a deposited electrode (cathode), which was prepared via the screen printing method. Microstructures, electrical property and magnetic property of the layered composites were studied. Results reveal that the porous composites present non-ferroelectric property and negative resistance effect, in which the former could be attributed to the fact that the sintering was conducted in a reducing atmosphere. Furthermore, the out-of-plane and in-plane leakage current characteristics could testify the homogeneity of the thick films in different directions via the electric fields which correspond to the leakage current peaks. The non-uniformity of the composite in the vertical direction may be related to the instability of BTO particles in suspension. Also, the dielectric constant in the out-of-plane mode decreases with increasing frequency owing to the existence of space charges. In addition, the bilayered films exhibit magnetic anisotropy, which could be ascribed to the interfacial stress between alumina substrates and Ni layers. © 2013 Springer Science+Business Media New York. Source


An electro-optic effect based optical voltage transformer comprises an optical voltage sensor head and an electrical unit, wherein the electrical unit comprises an optical closed-loop feedback control unit and a signal processing unit, the optical closed-loop feedback control unit is connected to the optical voltage sensor head and the optical voltage sensor head is connected to the signal processing unit. In this invention, the light source output power is more stable, the light source center wavelength drift is effectively controlled and the output power coastdown caused by light source aging is prevented; the optical power fluctuation of the optical polarization caused by factors such as temperature, optical fiber vibration, etc., is eliminated, which is conductive to stability and reliability of the optical system; the accuracy of data is improved.

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