A5101488748- Semiconductor Lasers and Optical Devices
- Advanced Measurement and Metrology Techniques
- Advanced Optical Sensing Technologies
- Color Science and Applications
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Advanced SAR Imaging Techniques
- Optical measurement and interference techniques
- Radar Systems and Signal Processing
- Color perception and design
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Liquid Crystal Research Advancements
- Surface Roughness and Optical Measurements
- Advanced Measurement and Detection Methods
- Photorefractive and Nonlinear Optics
- Antenna Design and Optimization
- Silicon Carbide Semiconductor Technologies
- Phase-change materials and chalcogenides
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Optical Imaging Technologies
- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Electrowetting and Microfluidic Technologies
- Catalytic C–H Functionalization Methods
- Optical Polarization and Ellipsometry
Zhengzhou University
2024
Anhui University
2019
PLA Electronic Engineering Institute
2016
SeaWorld Entertainment
2006-2012
Shanghai Liangyou (China)
2008
National University of Singapore
1997-1999
Tsinghua University
1993-1996
CAO Group (United States)
1993
Benzo-fused cyclic carbonates were designed and synthesized as a novel type of precursor π-allylpalladium zwitterionic intermediates.
The design of LDMOS (Lateral double diffused metal oxide semiconductor) devices with CFP (Contact field plate) has been great significance in recent years, according to its advantages low resistance and high switch efficiency. In this paper, ultra-low Ron,sp (Specific on-resistance) device is simulated, designed, fabricated. effects on FOM (Figures-of-merits) characters from physical dimensions, including plate length L, thickness H, slot contact width W, have analyzed discussed. best...
In this paper, a low-profile equiangular spiral antenna is designed. The bi-directional beam from an (EAS) changed to unidirectional using artificial magnetic conductor (AMC) reflector. height, measured the upper surface of AMC reflector arms, chosen be extremely small realize antenna: 0.07 wavelength at lowest analysis frequency 3 GHz. shows that EAS backed by does not reproduce inherent wideband axial ratio characteristic observed when isolated in free space. To solve problem modified...
Retrodirective array (RDA) is a new type of antenna with automatically backtracking function, which has special application value in radar countermeasures. When it used to jam the linear frequency modulation (LFM) pulse compression radar, bandwidth signal broadened by jamming modulation, resulting beam pointing error. A model repeater using phase conjugate established, and influences on error variety, number element, scanning angle leakage coefficient circuit are analyzed. The results show...
A frequency-modulation absolute distance measurement techniques using a external-cavity semiconductor laser is proposed. reference interferometer was adopted in order to reduce the effect of central frequency drift on accuracy. The principle described and experimental setup introduced. measurable range as large ten meters.
摘要: 机载双站SAR的距离徙动由其几何结构和收、发载机的运动参数共同决定，在一般构型情况下具有了2维空变性。该文建立了一般构型机载双站SAR的空间几何模型，通过对双站斜距做Taylor级数展开，得到了双站SAR在时域的距离走动和距离弯曲表达式，并利用收、发雷达的斜距解耦合公式，推导出了距离弯曲的补偿条件。通过仿真，验证了距离徙动的变化特性及其徙动补偿后残余距离弯曲的非对称性变化特点。 关键词: 机载双站SAR / 一般构型 距离徙动 斜距耦合 距离徙动补偿
A new method for measuring absolute distance is described which based on the frequency modulated continuous wave (FMCV technique. The preliminary experiment results show that accuracy can reach 0. 3mx at a of 7 meters and range exceed 10 by using an external cavity laser diode
Phase change (PC) optical disk is one important type of rewritable available currently. In PC recording, a bit information written by using laser beam to heat the which has been initialized crystalline state.
In modern semiconductor and optics industries, there is a strong demand for highly sensitive non-contact surface profilometer. This paper describes an optical heterodyne profiling interferometer with automatic focusing which has been developed recently. The essential feature of the profilometer newly designed common-path method to minimize effects environmental conditions. A powerful signal processing scheme also developed, includes three parts: voltage control, phase measurement control....
A novel heterodyne interferometer with a laser diode for measuring displacement is proposed. The carrier signal created by using an acousto-optic modulator. back surface of λ/4 plate serves as the reference mirror. These make have very simple construction. obtained phase difference between measurement and signal.
This paper describes an high precision in-process optical surface profilometer system. The measurement principle of the is based on phase comparison heterodyne signals. Disturbance from environment vibration and mechanical instability interferometer was effectively eliminated by using electronic common-mode rejection techniques. Measuring light can be automatically focused a moving-coil lens during sample scanning process. size small since laser diode used instead big He-Ne laser. suitable...
The interferometric range finding device with a grating external-cavity semiconductor laser is presented. By modulating the frequency of triangular injection current, an optical beat formed from Michelson intererometer unbalanced arms. proportional to difference between two interferometer complemented by measuring frequency. spectral linewidth greatly narrowed, i.e., coherence length extended, external feedback grating. So measurable obviously extended and effects phase noise on ranging...