小型光电经纬仪的光学参数选择

本文叙述了小型光电经纬仪上的两种重要的跟踪测量系统──高速摄影与微光电视的光学参数(口径和焦距)合理选择;它既满足了“小型化”的要求,又达到了中型光电经纬仪的性能指标(作用距离、测角精度等.     

Preparation and Visible Light Photocatalytic Activity for Photocatalyst of Permeable Glass Membrane/TiO2 Doped with Co

The photocatalyst of permeable glass membrane/TiO2 doped with Co （permeable glass membrane/TiO2 doped with Co） is prepared by the sol-gel method. The morphology and phase of the samples are determined by the field emission scanning electron microscopy （FESEM） and x-ray diffraction experiment, respectively. The photo- catalytic results show that the photocatalyst is sensitive to the visible light and exhibits excellent photocatalytic activity of photodegradation methylene blue. The photocatalytic mechanism is also discussed.     

GaAs IMSM光电探测器及其与FET的单片集成研究

采用S.I.GaAs衬底上MBE生长的两层结构外延材料制作了IMSM-PD并与采用离子注入材料制作的IMSM-PD的特性进行了比较,结果表明采用MBE材料的器件特性较优,在5V偏置电压下暗电流小于1nA。已将IMSM-PD与MESFET放大电路进行了单片集成构成光接收器。     

Modulation Instability in Biased Photorefractive-Photovoltaic Crystals

We show the modulation instability of broad optical beams in biased photorefractive-photovoltaic crystals understeady-state conditions. This modulation instability growth rate depends on the external bias tield, the bulkphotovoltaic effect, and the ratio of the optical beam intensity to that of the dark irradiance. Under appropriateconditions, this modulation instability growth rate is the modulation instability growth rate studied previouslyin biased photorefractive-nonphotovoltaic crystals, and the modulation instability growth rate in open- andclosed-circuit photorefractive-photovoltaic crystals can be predicted.     

Optical Stabilizer Based on Optical Bistable Devices with All-Fibre Construction

We propose a fibre optical stabilizer constituted by a photoelectric-hybrid optical bistable device in which fibre Bragg grating is used as a light intensity modulator. The intensity noise-reducing ability is well improved through the method by employing two feed signals. As a result, the light intensity variation can be reduced to - 1/64.     

低温下测量超导球转子极轴偏角的光学读取系统的研究

本文介绍了一种低温下测量超导球转子极轴偏角的光学读取系统及其读取原理，讨论了光学读取系统照明产生的热量对转子正常工作的影响．分析结果表明，此光学读取系统可用于液氦温区下测量超导球转子的极轴偏角．     

一种基于CCD对准的光电测量方法

本文描述一种基于ＣＣＤ平均能量法使光学边沿对准的光电测量方法，该方法采用光栅作计量元件，精密平台作扫描方式，实现了自动高精度的光学码道测量，特别适用于卫星定向用的光学码盘码道尺寸精密测量。     

Characteristics of THz Emission from GaAs Crystal Excited by 400 nm and 800 nm Optical Pulses

THz emission spectroscopy is used to study the generation mechanism dependent behaviour of terahertz (THz) electromagnetic waves from the GaAs crystal under excitation by 40Ohm and 800hm femtosecond (fs) pulses, respectively. The wavelength dependence of the emission spectrum under two types of THz generation mechanis msis analysed. Under the optical rectification mechanism, a slight enhancement of the spectral amplitude in the high-frequency regime is observed in a GaAs(l10) crystal by the excitation of a 400-nm optical pulse compared with that of 800nm. Whereas an obvious red shift of the amplitude spectrum occurs in the GaAs(100) sample under the transient photoconduction mechanism. These phenomena are explained in detail by the duration of the optical pump pulse and the band structure of GaAs, respectively.