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This tutorial talk will describe various modalities recently developed for high-speed chemical imaging of cancer, neuron and infectious diseases, with a focus on stimulated Raman scattering microscopy, pump-probe microscopy, and mid-infrared photothermal microscopy.
We propose Raman amplified quasi-single-mode transmission with hybrid few-mode-fiber (FMF) and single-mode-fiber (SMF) span using CO-OFDM signals. The OFDM signal is robust to multi-path interference (MPI) and DD-LMS algorithm can be eliminated.
In this paper, several Terahertz (THz) high-gain planar integrated antenna arrays developed in University of Electronic Science and Technology of China (UESTC) are introduced based on the diffusion welding technology. Thanks to their wideband, high-gain and compact configuration, these types of antenna arrays present excellent candidates for THz multi-gigahertz capacity wireless systems.
Frequency selective surface (FSS) based on substrate integrated waveguide (SIW) technology is a passband spatial filter with periodic arrays of slots, which has wide applications, such as the sub-reflecting surface of the reflector antenna, and the antenna radome. Compared with the conventional FSS, the SIW FSS is a better candidate with high rectangular coefficient, good incident angle stability,...
Vertical comb drives are critical for electrostatic optical switches and variable optical attenuators (VOAs), but fabricating vertical comb-drives suffers from the difficulty of dealing with the comb-finger misalignment. This paper presents a vertical comb drive design and its micro-fabrication method that can realize self-aligned two-level comb fingers. The self-aligned vertical comb fingers are...
In this paper, a modified substrate integrated waveguide (SIW) Rotman lens is proposed to feed several SIW slot array antennas in order to generate multiple focal points. This modified SIW Rotman lens, as a focused beamforming network (BFN), consists of eleven input beam ports and fifteen output array ports. Its phase shifting network is modified to satisfy the requirements of beam focusing and scanning...
The knowledge of induced currents in the human body from exposure to various sources of power line frequency magnetic field is important in the assessment of potential health hazards. This paper briefly outlines methods of computations of magnetic fields from sources such as high-voltage transmission lines or other line current-carrying conductors, and from small appliances. To compute the induced...
In this paper, several two-dimensional multibeam antennas are presented based on the compact substrate integrated waveguide (SIW) twist technology. Firstly, four 90° couplers and four 90° SIW twists are combined to feed a 2×2 multibeam integrated antenna array. Simulated and measured results show that the gain of the antenna is larger than 8.5 dBi. The antenna beam scans at different angles in the...
The orbital angular momentum (OAM) beam can be used to significantly increase the communication capacity. In this paper, a reflectarray antenna is proposed and demonstrated for generating arbitrary OAM beams. A new dual-resonance dipole element is employed to implement the conversion between the incident spherical wave and the reflected OAM wave. Besides, this element can provide very good polarization...
Skin-based biometrics rely on the distinctiveness of skin patterns across individuals for identification. In this paper, we investigate whether small image patches of the skin can be localized on a user's body, determining not “who?” instead “where?” Applying techniques from biometrics and computer vision, we introduce a hierarchical classifier that estimates a location from the image texture and...
In reliability engineering, especially in the context of reliability test design, it is important to determine how many product samples should be put into field test to evaluate product reliability level or verify whether the product reliability satisfy the predefined requirement in the development contract. In this paper, the determination method on sample size under the condition of Bayesian sequential...
Renewable energy is one of the most important sources used for the production of electrical energy due to its natural availability and lack of harmful effects on the environment. From these sources, wind energy is often located in remote areas where exposure to disturbance sometimes affects its functioning. This paper consists of two parts. In the first, we propose a new Modified Bacterial Foraging-Particle...
An optical diagnostic system to investigate the vacuum breakdown under microsecond pulsed voltage is constructed, which consists of a vacuum breakdown chamber of a high-voltage pulse driver and a high speed camera system. The jitter of the breakdown time delay is on the range of microsecond. To determine the moment of exposure, the gate-monitor output is compared with discharge current measured by...
A criterion to describe the turn-to-turn discharge of the secondary winding in Tesla transformers is presented. Factors which have influences on the turn-to-turn insulation of the winding such as the wire diameter, the wire distance, the void size, the purity of transformer oil and the insulation strength of the wire are researched based on this criterion. By theoretical calculation, the electric...
In this paper, a dual circular polarized (CP) spherical conformal antenna array is designed based on a 3D printing framework. The 3D printing technology is employed to simplify the manufacturing process and reduce the cost. There are 23 elements arranged on the hemispherical surface with an optimized distribution. It also has the ability to scan a beam within the hemispherical coverage.
A four-band frequency selective surface (FSS) based on the quarter-mode substrate integrated waveguide (QMSIW) is proposed and investigated in this paper. The periodic unit consists of four neighboring QMSIW cavities with “L” type slots etched on the top and bottom surfaces. Each passband is controlled by the corresponding cavity and the performance can be easily achieved by adjusting the dimensions...
In this paper, a substrate integrated conformal antenna based on a 3D-printing conical pedestal is demonstrated. This array is mounted on a cone with a radius on the top of 15 mm and a radius on the bottom of 35 mm. It is synthesized at the center frequency of 35 GHz. It is not an easy task to fabricate a non-planar structure, thus the 3D printing technology is used to fabricate the cone. This method...
In this paper, a 92∼94 GHz low sidelobe level (SLL) and high gain slot antenna array based on the substrate integrated waveguide (SIW) technology is presented. The antenna includes two SIW 16×16 arrays, which are placed back-to-back, and a waveguide divider. The aperture size of the antenna is 34×90 mm2. Simulated and measured results show that the return loss is larger than 10dB, and the SLLs in...
A wide-beam linear-polarization microstrip antenna in C-band is designed and analyzed in this paper. A double-layer patch antenna is used as the radiating element to increase the gain and widen the bandwidth. This array consists of two three-element sub-arrays, each of which is fed by a three-way Wilkinson power divider. These two sub-arrays are combined as a whole antenna array by a non-planar two-way...
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