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Much effort has been devoted to the study of glasses that contain the chalcogen elements (sulfur, selenium and tellurium) for photonics' applications out to MIR wavelengths. In this paper we describe some techniques for determining the refractive index dispersion characteristics of these glasses. Knowledge of material dispersion is critical in delivering step-index fibres including with high numerical...
A novel ellipse cavity-backed and slot-tuned bow-tie antenna was designed to facilitate the application of ultra-wide band (UWB) ground penetrating radar (GPR) in low frequency. Lumped resistor loading was applied at the end of antenna arms to broaden the impedance bandwidth. Taper tuned method was also used to optimize the current distribution. Antenna characteristic was analyzed by simulation. Finally,...
In this paper, a vital sign feature (V SF) detection and search strategy using multiple UWB life-detection-radars with different locations is proposed. Firstly, the different VSFs from all single UWB life-detection radars placed on multiple radar observation points are categorized. Then, the proposed detection strategy is used for the different VSF categories. Finally, the target's spatial location...
China's Mars probe including an orbiter and a landing rover will be launched by 2020. A subsurface penetrating radar (SPR) instrument has been selected to be a part of the payload on the rover. The main scientific objective of the SPR is to characterize the thickness and sub-layer distribution of the Martian soil. The SPR consists of two channels. The low frequency channel of the SPR will provide...
Lunar Regolith Penetrating Radar (LRPR) is a high resolution penetrating and imaging radar, which is a main payload onboard the detector of Chang'E-5. It is mounted on the bottom of the detector of Chang'E-5 and its main task is to survey the lunar regolith thickness and subsurface structure of landing domain. Because the detector is static, LRPR has to work only in stationary condition and is designed...
In this paper, according to the two design principles of uniform distribution and less element shadowing for effective aperture, a novel two-dimensional (2-D) sparse ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna array topology is proposed for near-field high-resolution imaging. Compared with another different array having the same number of transceivers, the proposed optimal array...
A high-efficiency scheme based on both time division multiplexing (TDM) and parallel processing of FPGA is proposed in this paper to address the problem of high scanning rate in high-speed measurements with UWB array GPR. The merit of this new scheme is that all trigger signals of all the channels can be delayed in a controllable step through the same delay chip at different times. Each channel of...
This paper describes an array antenna system for lunar regolith penetrating radar (LRPR), which is an important payload onboard the lander of Chang'E-5. The array's proposed operational frequency range is from 1000MHz ∼ 3000MHz. It has 12 elements arrayed along their H plane. The elements are designed into a compact Vivaldi antenna with 1/4 elliptical slot in order to realize the need for ultra-wideband,...
This work presents TCAD simulation for InGaN multiple quantum well (MQW) solar cell at high temperature and high solar concentration that have recently been reported. A MQW device with 40 periods of In0.12Ga0.88N/GaN quantum well stack is simulated. Simulation results are in close agreement with experimental I-V data measured up to 450 °C and under concentration of up to 300 suns. The impact of polarization...
Springer Series on Chemical Sensors and Biosensors
For the first time, distinguished scientists from key institutions worldwide provide a comprehensive approach to optical sensing techniques employing the phenomenon of guided wave propagation for chemical and biosensors. This includes both state-of the-art fundamentals and innovative applications of these techniques. The authors present a deep analysis of their particular subjects in a way to address...
Silicon IQ modulator based 80×337.9-Gb/s Nyquist-WDM transmission was experimentally investigated for 42.24 Gbaud PDM-16QAM. The single channel over 1600 km and Nil-channel transmissions over 960 km standard single-mode fiber (SSMF) with EDFA-only were successfully demonstrated.
We report 480km transmission of C-band 80×453.2Gb/s PDM-eOFDM hybrid 8–64QAM DWDM signals over G.652 fiber and EDFA-only link at 9b/s/Hz spectral efficiency based on silicon IQ modulator and 84.48G sample/s DAG
This work presents TCAD simulation for InGaN solar cell at high temperature. 1J solar cells, n-i-p structure based tunnel junctions and a 2J tandem solar cell are investigated. Tunneling and thermionic emission models are included to assist current to transport through hetero-interface. We also introduce a step layer at hetero-interface to relax band offset and polarization, which is more practical...
This paper proposes a ring model with air-gap to evaluate iron loss of steel sheet under sinusoidal and non-sinusoidal pulsed width modulation excitation with high harmonic content. B-H curves are measured under both DC and AC conditions. Iron loss is analyzed with varied frequency and flux density, then compared with Epstein model. The evaluation of iron losses with constant B peak value under non-sinusoidal...
Sm-Co magnet was attracted attention due to its high Curie temperature and superior comprehensive magnetic properties [1-5]. Different with powder metallurgy method, melt spinning is another efficient way to prepare Sm-Co magnet. The quenching speed in melt spinning is a critical factor to obtain ribbons with high magnetic properties. Recently, D.Y. Feng [6] et al. reported that intrinsic coercivity...
Magnetic gears (MGs) are potential alternatives to conventional mechanical gear boxes. With high performance permanent magnets (PMs) and new topologies, today MGs are capable to transmit a torque that is competitive with mechanical gear boxes in a totally contact-free way. MGs can be categorized by their flux orientations, namely, radial flux magnetic gear (RFMG), axial flux magnetic gear (AFMG) and...
Bit Patterned media recording (BPMR), heat assisted magnetic recording (HAMR), and shingled writing (SMR) with 2-dimensional (2-D) readback have been explored to further scale magnetic recording areal density over the next decade. However, from a signal processing perspective, all these magnetic recording technologies face a common challenge that is how to efficiently recover recorded data from the...
Bit-patterned media recording (BPMR), heat (or microwave) assisted magnetic recording (HAMR) and shingled writing (SW)/two-dimensional magnetic recording (TDMR) have been primed to further increase the areal density of magnetic recording beyond 1Tb/in2[1-3]. However, with the reduction of the track pitch, inter-track interference (ITI) becomes a major impairment for these magnetic recording systems...
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