Magneto-optical device and its application in optical communication / Ma Changgui (Southwest China Institute of Applied Magnetism) 丨 丨 Magnetic materials and devices. One 2001, 32 (6;). ―35-39 briefly introduces the basic structure and performance of several major magneto-optical devices, then briefly describes their application in optical communication systems, and looks forward to the market prospects. Finally, the status quo and development of two magneto-optical Faraday rotor materials are introduced. Table 1 Reference 5 (Noon) DSP-based control method of magnetorheological dampers Miyi 2001, developed a precise and controllable current controller based on the 16-bit fixed-point universal digital signal processing chip DSP introduced by Texas Instruments, the current can be adjusted within the range of 01.5A, and the output current has high accuracy and good linearity. . The control effect is remarkable. Anomalous spike effect in Bi2Sr2CaCu208 single crystal with 7 ginseng 3 (noon) / Wang Wenhu, Li Shiliang, Chen Zhaojia, Wen Haihu, Xiong Yufeng (Institute of Physical and Chemical Technology, Chinese Academy of Sciences) 丨 丨 Physics. In 2001, the hysteresis loop of Bi2Sr2CaCu208 single crystal was studied using Oxford Vibration Sample Magnetometer (VSM). An abnormal sharp effect was found between 20 and 40K. With the increase of the sample content, the external field where the sharp effect occurred also increased accordingly. It can be considered that the phase transition from the ordered solid to the disordered solid of the vortex material occurs at the sharp effect. On the BSCCO single crystal phase diagram with a small number of point defects, the Bsp line ends at 20K temperature, below 20K There is no quasi-lattice to vortex glass phase transition in the temperature zone, and the vortex solid phase always exists in the form of quasi-lattice; it can be considered that the spike effect is a complex function of external field, temperature, and disorder. Reference 15 (noon) MgB2 and Mg.93Li.07B2 Resistivity and Fan effect study / Li Huiling, Ruan Keqing, Li Shiyan, Mo Weiqin, Fan Rong, Luo Xigang, Chen Xianhui, Cao Liehao (University of Science and Technology of China) Count R // (T ) Temperature dependence. The measurement results of resistivity show that the normal state resistivity of MgB2 and Mg0.93Li0.0TB2 has a square dependence on temperature. The superconducting transition temperatures of MgB2 and Mg0.93Li0.07B2 are almost the same. The measurement results of the Hall coefficient table are that the carrier types of MgB2 and Mg0.93Li0.07B2 are hole-type, and the Hall coefficients of both decrease with increasing temperature, and the Hall coefficient of Mg0.93Li0.07B2 is higher than that of MgB2 Slightly reduced, this may be related to the introduction of holes by Li doping. Both Hall angles have a linear relationship with the temperature squared. See 17 (Lu) High-voltage synthesis of Ca- (Pr) -123 series superconductors / Xiong Han, Che Guangcan, Yao Yushu, Ni Yongming, Dong Cheng, Jia Shunlian (National Superconducting Laboratory, Institute of Physics, Chinese Academy of Sciences) // Physical use of high temperature The CRo.4Pro.6V5Ca.5Ba2 123-phase superconductor was successfully synthesized by high-pressure method. The results show that Ca-doped in the R-123 phase compound of the Pr system can obtain superconductors with high Tc, and the superconducting transition temperature is around 1K. Reference 14 (noon) phase voice reached a high-temperature starting C-band oscillator of 134dBc / Hz / Li Hong, He Aisheng, Shi Tiefeng, Gong Zhonglin, Li Shunzhou, Sun Yongwei, He Yusheng (Institute of Physics, Chinese Academy of Sciences) // Scientific Bulletin. One 2001, 46 (23). -2016-2019 uses 50mm HTS film and sapphire medium to develop a high-Q resonant cavity, the resonant frequency is at /0=5.624GHz, and at 77K, its unloaded Q value reaches 1.09x16. The resonator and low-noise amplification The HTS low phase noise oscillator composed of circuits and other devices has been tested by the national metrology department and shows that the phase noise superconducting Josephson transmission line is preliminary researched at 10kHz away from the resonance frequency / Zhang Jian, Guan Boran (Xidian University of Electronic Technology); With superconductivity. A 2001, 29 (sentences. A 17-22 article gives a detailed explanation of how the JTL superconducting Josephson junction transmission line transmits and amplifies the SFQ signal pulse in the text that is very important and the most basic circuit in RSFQ; well on this basis On the basis of some characteristics of JTL, such as repulsive "effects" and time jitter, a computer simulation study was conducted on the characteristics and development prospects of high-temperature starting transformers in Section 5 (Wood) / Chen Min, Yu Yunjia, Xiao Liye (Institute of Electrical Engineering, Chinese Academy of Sciences) Low temperature and superconductivity. One 2001, 29 (4). -50-55 reviewed the development history and research status of high temperature superconducting transformers. By comparing high temperature superconducting transformers with conventional transformers and low temperature superconducting transformers, it introduced Existing problems in the research of high-temperature superconducting transformers, and their development trends are forecasted. See 9 (Wood) ferromagnetic-d wave superconducting junction rough interface scattering and spin reversal effect on the steep road please color sound / Dong Zhengchao (Huaiyin Teachers College) 丨 丨 Physical Journal. One 2001, taking into account the spin polarization effect in the ferromagnetic layer, as well as the rough scattering and spin inversion effects of the interface, using the popular Blonder-Tinkh The am-Klapwijk theoretical model is used to calculate the spin-polarized tunneling spectrum in the ferromagnetic-d-wave superconducting junction. Studies have shown that 1) the spin-reversal effect can sharpen the zero-bias piezoelectric peak; 2) coarsely planted In addition to lowering the height of the zero-bias piezoelectric conduction peak, interfacial scattering can also induce a central peak at the zero-bias depression. The results can qualitatively explain the two recent articles on the La2 / 3Ba1 / 3Mn03 / DyBa2Cu307 and LaBaMnOs / YBasCusCd junctions Experimental report in China. Refer to 15 (noon) 5. Vacuum electron technology launches out with the interest of the virtual cathode oscillator / Shao Hao, Liu Guozhi (Northwest Institute of Nuclear Technology) Physics News-* 2001, 50 (12) * 23872392 In the field of high-power microwave source research, a new type of virtual cathode device is proposed-an outward-emitting coaxial virtual cathode oscillator. The relevant beam characteristics are theoretically analyzed, and the coaxial space radial transmission space is obtained. The charge-limiting current, as well as the conditions for generating the virtual cathode and the basic laws of electron beam movement. Based on the results obtained by numerical simulation, the outward-reflection coaxial virtual cathode oscillator not only exhibits higher energy conversion efficiency, but also helps increase the virtual The pulse width of the high-power microwave generated by the cathode device can also be applied to low-frequency high-power microwave sources. The possible microwave output method of this virtual cathode device is also discussed. 6 parameters 13 (noon) to reduce the electromagnetic noise of the plasma display Method research / Lu Shengli, Cao Yun, Wu Jianhui, Shi Longxing (National Engineering Research Center for Integrated Circuit System of Southeast University) 丨 丨 Circuit and System ft According to the working principle of plasma display, the preparation of surface discharge plasma display was discussed. Electromagnetic noise is generated in the three stages of address and sustain discharge lighting, and the cause of electrical noise in the drive circuit, and corresponding solutions are given for the source of electromagnetic noise, which greatly reduces the electromagnetic noise and electromagnetic Radiation and interference to other electrical appliances.
0reference 3 (gold) Structure and principle of a new type of embedded vane vacuum pump / He Yunxin, Li Xinmo, Geng Kuihua, Wang Qing, Geng Ainong (Guangxi University) "Vacuum. One 2001, (6). * 33-34 introduces the structure and working principle of a new type of embedded vane-type rotary vane vacuum pump. The vacuum pump includes the advantages of small volume, light weight and simple structure of the empty pump, and also has less friction loss and Fewer leaks are reported. See 3 (noon) analysis of the unevenness of the slide valve / Chen Hong, Hu Huanlin (Hefei University of Technology) Vacuum. * Spool valve vacuum pump is a positive displacement vacuum pump, which is widely used in the industrial field. There has been no accurate calculation method for the balance of the rotating piston of the pump for a long time, and the centrifugal force generated by the rotating piston causes a large vibration of the pump. Therefore, reducing the vibration of the pump has long been the goal pursued by Chinese designers.
Based on the analysis of the inertial force of the rotary piston of the spool valve pump, the theoretical analysis and comparison of the balance effect of the H-150A, H-150 domestic single-cylinder pump and the GKT-300AB three-cylinder spool valve pump of the British company GENERAL . In the direction of the development of the dynamic balance of the slide valve pump, Ding's own f method Table 1 reference 4 (noon) refrigerator cryogenic pump failure and phase / Ren Weixiang, Ren Jiasheng (Southeast University) "vacuum. The cold source of a cryogenic pump of a refrigerator is a small refrigerator. Various failures may occur during the normal operation of the refrigerator, which has a significant impact on the refrigeration capacity and temperature of the refrigerator, as well as the pumping characteristics of the pump. The article focuses on discussing the various failures, causes and elimination of the refrigerator in daily operation. Table 1 Ref. 6 (noon) BEPC improves the vacuum system in the Qiao District / Dong Haiyi, Song Hong, Lin Shaoluan, Peng Xiaohua, Qi Tiezhu, Zhang Dajun, Li Qi (Institute of High Energy Physics, Chinese Academy of Sciences). In 2001, the BEPC collision zone vacuum system was one of the most important parts in the storage ring vacuum system. The performance of the collision zone vacuum system directly affected the background of the spectrometer detector used in high-energy physics experiments, thus improving the collision zone The degree of vacuum is very important. This paper proposes a scheme to install the NEG pump near the collision point to increase the vacuum in the collision zone, and predicts the effect of installing the NEG pump using classic mathematical calculation methods and Monte Carlo simulation calculation methods. Proved the feasibility of improving the vacuum in the collision zone by NEG pump. Through the improvement of the vacuum system in the BEPCX5J1I zone, the static pressure of the BEPC collision zone is nonlinearly analyzed from the original 8xlO-8Pa 8mm band third harmonic compound cavity gyrotron / Yu Sheng, Li Hongfu, Xie Zhonglian, Luo Yong ) / 丨 Physics News. * 2001, using the transmission line equation of g current, under the consideration of many practical factors, the self-consistent nonlinear simulation of the third harmonic gradual compound cavity gyrotron was carried out, and the third harmonic in H511-H52i mode was charged. The interaction of the injection wave, the influence of the thickness of the electron injection, the velocity dispersion, the value of the velocity ratio a and the magnetic field fluctuation on the interaction of the multi-mode injection wave are analyzed. See 8 (Lu) Theoretical Analysis of Space Charge Waves for Strong Current Relativistic Electron Beam Clustering / Huang Hua, Chang Anbi, Tan Jie, Ma Qiaosheng. Gan Yanqing, Jiang Jinsheng (Institute of Applied Electronics, Ding Cheng Institute of Physics, China) 丨 丨 Journal of University of Electronic Science and Technology of China. 1. 2001.30 (1). * 53-57 introduced the space charge wave theory of intense current relativistic hollow electron beams (IREBs) in the study of long pulsed intense current relativistic klystrons (RKA). The dispersion equation of IREBs transmitted in the S-tube is established, and the transmission line model of the interaction between IREBs and the RKA input cavity gap electric field and the cluster transmission of IREBs in the drift tube is obtained. The modulation current expression generated after the electron beam passes through the input cavity gap is obtained. . Using a hollow electron beam of 500kV, 3kA, and a pulse width of about 1.4 / iS, injected with a microwave modulation of 70k. After the beam passed through the input cavity, a fundamental current modulation depth of about 9.8% was obtained. The research results are basically consistent with the theoretical analysis. See 7 (Li) 7.6cmYAG projection technology research / Wang Jun, Cheng Jianbo, Lin Zulun (Xi'an Jiaotong University) 丨 1 Electronic Journal. One 2002, 30 (2).
Bottom technology. This new type of color cast tube has a small volume. High Brightness. The resolution is good. The long life feature has been used for 122cm and 183cm home rear projection machines and commercial TV wall displays. Study on the discharge characteristics of a new plasma flat panel display / Tu Yan, Zhang Xiong, Wang Baoping (Department of Electronic Engineering, Southeast University) 丨 / Journal of Electronics. One 2002, 30 (2). * 258-261 The discharge characteristics of a new slot-type plasma flat panel display discharge cell with characteristics of fast response frequency, high brightness, low ignition voltage and low cost are studied, and compared with the traditional surface discharge structure. The electric fields in discharge cells with two structures at different times are given. The spatial distribution of various particle concentrations and the relationship of the average concentration of various particles with time. In the absence of an energy recovery circuit, the luminous efficiency of the experimental screen of this structure 14 reaches 0.91m /, and the power consumption is 50W. Table 1 refers to the comprehensive calibration of the real-time measurement accuracy of the 6 (gold) large-field photoelectric measurement system. , Gao Xiaodong, Cao Xuedong (Institute of Optoelectronic Technology, Chinese Academy of Sciences) "Optoelectronic Engineering. One 2001, 28 (6). * 10-13 gives the spatial coordinate relationship of the multi-camera system large-field stitching imaging, and establishes a mathematical model. Based on this, a preliminary analysis of the factors that cause the measurement error of the large-field photoelectric measurement system and gives The method and steps of the on-site calibration of the comprehensive measurement error of the system are presented. See 1 (noon) high current. Research on High Gain Gated Photomultiplier Tubes / Zhu Jingping (Nanjing Institute of Electronic Devices) -280 introduced a microchannel plate photomultiplier tube with the largest output current, the highest current gain and gated gating function in public reports at home and abroad , The tube uses a large diameter input window. Multi-alkali photocathode. Three micro-channel plates are used as the close-focusing structure of the multiplier. Table 1 Ref. 4 (noon) Measuring the voice of low-light image intensifier with photomultiplier tube / Zhang Wei, Wang Yuefeng, Dong Wei (Ordnance T Cheng Academy) (/ Optoelectronic Technology. I 2001, 21 (4). * 281 -283 In the low-light image intensifier imaging, the spatiotemporal noise superimposed on the image not only limits the minimum illuminance that the system can work, but also makes the displayed image have the appearance of randomly creeping particles flickering. With low noise, The emergence of high-gain photomultiplier tubes makes it possible to measure weak optical signals more accurately, so on this basis, a method of using photomultiplier tubes to test the noise of the image intensifier is proposed. The experiment found that this method can be more accurate and intuitive Reflect the noise level of the image intensifier. Study on 2 new types of low-noise MCP / Fu Wenhong, Chang Benkang (Nanjing University of Technology) // Background noise is an important factor that causes the second-generation image tube to have a low yield The noise is the main source of background noise of the second-generation image tube. This article analyzes the main noise source of the microchannel plate, clarifies the mechanism of photon scattering and electron scattering, and adopts flaring technology to the input surface of the microchannel plate. Improving the ratio of the opening area of ​​the microchannel plate, reducing the noise of the microchannel plate, and improving its resolution, provide a basis for further process research. Table 1 Reference 3 (wood) Scanning electron microscopy imaging signal analysis / Chen Changqi, dry Shu Yi, Zhu Wu, Wang Xianlu (Hefei Dingye University) "K Kong. One 2001, introduced the basic working principle of scanning electron microscope (SEM), focusing on the analysis of various imaging signals generated by the SEM initial electron beam The method and its characteristics determine that the secondary electronic signal becomes the ultimate source of SEM due to its high imaging resolution and rich imaging information.
Aiming at the defects exposed by the signal in practical applications, solutions are introduced, so that the imaging performance of the SEM can be greatly improved, and the range of use is greatly expanded. / Zhou Renkui, Fu xuan, Zhou Sizhong, Xia Shaojian (Xi'an Institute of Optoelectronics, Chinese Academy of Sciences) (I Optoelectronics. Laser. 2001, 12 (12). -1230 introduces the synchrotron radiation (SR) beam 5-25KeV sagittal focusing twin crystal single The monochromatization and focusing legs of the colorimeter, that is, based on Bragg's law, change the Bragg angle 0 to obtain the required wavelength A to achieve the monochromatic beam; according to the Bragg angle 0 and the sagittal radius of the bending crystal, R The relationship between the monochromatic light beam and the direction of the monochromatic light through the bending crystal is changed. The article describes the bending principle of the bending crystal based on the flexible hinge and the suppression of the saddle deformation of the bending crystal. The fixed characteristics and the results of the finite element analysis of the profile error of the diffraction surface of the buckled crystal refer to the technical progress of 5 (wood) solid light sources and lamps / Wang Erzhen, Wang Chunfeng (East China Electronics Group Company) " The solid light sources and appliances have entered the lighting market. The current solid light sources are mainly light-emitting diodes (LEDs) and organic electroluminescence (OEL). These trapped body light sources can be driven at low voltages and can be used in a variety of harsh environments. It has the characteristics of small size, light weight, small electrode loss, fast response speed and long life. This article introduces the structure, characteristics and technical development trends of solid light sources LED and EL. Solid light sources will develop into new energy-saving new light sources in the 21st century 5 (noon) China's scientific and technological progress of electro-optical sea materials / Yang Yufeng (Institute of Electric Light Source Materials of the Ministry of Light Industry) China Lighting Appliance. One 2001, reviewed the current status of China's electric light source material industry and the technological progress of major products, and analyzed the existing in more detail Problems and future development direction. (Lu) The lighting control circuit of the information light source / Wang'er Town (East China Electronics Group Corporation) // With China's rapid development of the information industry, the information industry has developed many information equipment, these The device has the functions of reading, processing, recording, transmission, display, etc. In order to implement these functions, the correct used Source and lighting circuit. This article mainly introduces the control and development of the lighting circuit of the information light source. The light sources used in the information industry are halogen tungsten lamps, fluorescent lamps and short-arc HID lamps. The lighting circuits include DC lighting circuits and sine waves, rectangular waves, Appropriate frequency modulation wave, etc. AC lighting circuit 7 Table 1 Reference 7 (noon) High-pressure gas discharge lamp set value derivation and significance of parallel compensation capacitors when working together / Shi Ting'an "China Lighting Appliance. One gives high-pressure gas discharge lamp use Calculation method, empirical formula and application of compensation capacitor values ​​for inductive ballasts. (Wu) Comprehensive evaluation of compact Laoguang lamps on the domestic market / Zhang Shanduan, Zhu Shaolong (Electric Light Source Institute of Fudan University) /; China Lighting Appliances. 1. 2001, (11). 32-35 There are many manufacturers of compact fluorescent lamps on the domestic market, but the price and performance vary greatly. The representative integrated compact fluorescent lamps are divided into four groups according to price. Devices, phosphors, luminous flux, light attenuation, safety and other aspects were analyzed and tested, and a comprehensive evaluation was made with reference to their prices. The results show that the cost performance of compact fluorescent lamps above 20 yuan is high, and there are certain doubts about the use value of lamps below 1 yuan. Table 4 (Noon) Research on the production line of compact fluorescent lamps / Li Guangan (Southeast University Electric Light Source Research Center) Introduce the research overview of the first 1200 / hour single U (tt), 2U (tt) compact flame lamp semi-automatic production line independently developed in China (Lu) The research on the metal halide lamp starting performance measurement and control system / Deng Kuigang, Zhai Yujian, Li Guangan, Chen Wenwu (Southeast University) "Instrument Technology and Sensors. One 2002, (3).
* 14-16 Introduced the automatic test machine for the start-up performance of the golden lamp and its PLC control system, clarified the structural characteristics of the test machine and the software and hardware design of the PLC system, and focused on the test circuit, programmable controller and host computer of the system Communication methods and communication principles, software design ideas and program structure. Part 7 (Gold) Research and development of self-cleaning lighting fixtures using the principle of photocatalysis / Chen Feili, Wang Liangyan, Zhu Chunmei, Zheng Shaojian, Feng Manzhi, Huang Qiong, Yang Baoshan (Guangzhou Energy Research Institute, Chinese Academy of Sciences) The reasons and processes for the reduction of luminous flux are analyzed, and the feasibility of using photocatalytic principles and techniques to make these lighting fixtures free of fouling conditions and environment is analyzed. The goal is to research and develop lighting fixtures with self-cleaning function. The experimental results show that: the Ti02 film with a thickness of 0.10 ~ 0.3A * n prepared by the sol-gel method has a spectral transmittance of greater than 90% in the visible light band and a Ti2 of less than 5% in the ultraviolet light band The film can not only absorb the ultraviolet light emitted by the light source, but also generate free radicals with strong chemical activity. OH, to eliminate the fouling and scaling on the surface of the light source, while not blocking the visible light output used for the lighting function, the overall result is to maintain the luminous flux output of such lighting fixtures at a high level for a long time. High pressure can be accepted! (Research on T% sub-ballasts / Zhang Weiqiang, Wang Wei, Xu Danguo (Harbin Institute of Technology) Journal of Harbin Institute of Technology. 1 2001, 33 (6).
When the high-pressure sodium lamp is matched with the traditional inductive ballast, the lamp current impacts the cathode too much, which shortens the actual service life of the high-pressure sodium lamp. Moreover, when the street lamp group is lit, only the control method of batch and segmentation can be adopted, which causes management difficulties. To this end, a design scheme of high-performance electronic ballast is proposed.
By controlling the operating frequency of the electronic ballast power inverter stage to reduce the current when the high-pressure sodium lamp is started, thereby achieving soft start. The test results show that the designed electronic ballast has a power factor of approximately 1, and can effectively reduce the impact of the starting current on the lamp, thereby prolonging the service life of the lamp and overcoming the disadvantages of the traditional inductive ballast. 1 ginseng 2 (wood) 6. Overview of optoelectronic technology optical passive device technology development (continued) / Wang Hong (Huazhong University of Science and Technology) 丨 丨 Optical communication technology.
Continue to introduce the development of optical passive device technology, this article focuses on the development of optical switches, optical attenuators and optical isolators. Table 2 Reference 14 (wood) frequency upconversion signal recognition research / Liu Tiegen. Zhang Yimo, Liu Ming, Li Chuan, Ding Sheng (Tianjin University Institute of Modern Optical Instruments) "Optoelectronic Technology and Information. The use of up-conversion materials can effectively convert infrared rays into visible light. For a certain up-conversion material, when the proper excitation light source is selected for excitation, a uniquely determined conversion spectrum can be obtained; the use of up-conversion materials to convert infrared rays into visible light is a technique that has good privacy and is safe and effective It is only used in anti-counterfeit authentication technology. In this paper, the theory of optical frequency conversion is theoretically established, and the low-light spectrum detection system is established to enable the optimal combination of new spectral emission devices, special photoelectric receiving devices, optical filter devices and photoelectric hybrid integrated modules, special weak light signal processing and chips, etc. match. See 6 (noon) 11 11
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