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Issue 3 ， 1991
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A Study of Soft X-ray and VUV AI2O3 Photodiodes
Abstract：Due to the wide spectral responsivity and the excellent performance, the photodiode with Al2O3 photocathode is often used as a transfer standard detector of soft X-ray and Vacuum Ultraviolet spectral range. This paper describes the operating principle and the structure of Al2O3 photodiode developed in our Lab, as well as its manufacturing technology, discusses the method and equipment for the performance evaluation of the Al2O3 photodiode, and gives the measurement results.- 52
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Published：2020-08-12 -
A Study for VUV Ionization Chamber
Abstract：With the development of space science, plasma physics and short wavelength laser study in recent years, there is a great progress on soft X-ray and Vacuum Ultraviolet spectral radiation metrology. This paper discusses the operating principle, the structure and the performance of VUV rare gas ionization chamber standard detector developed in this Lab, describes the evaluating equipment of the detector performance which is based on McPherson 247 grazing incidence VUV monochromator, and finally presents the measurement results.- 55
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Published：2020-08-12 -
The Performance Comparison of Three Types of Near Infrared Reflectance Spectroscopy Device in Measuring the Chemical Composition of Layer Mixed Feed
Abstract：Three types of Near Infrared Reflectance Spectroscopy (NIRS) device, Neotec 51A. Trebor-70 and the NIRS analyzer were made by Changchun Institute of Optics and Fine Mechanics that were applied to measure moisture, protein fiber fat lysine, methionine, metabolism energy (ME) of 58 layer feed formulated in laboratory. By comparing the precision, reproduction, stability among these three devices the result indicated that the NIRS device made by Changchun Institute is comparable with the other two import devices in all performance. This NIRS device can be widely used to provide accurate and prompt on-line production for mixed feed analysis and the great bencfit will be achived to the feed mills.- 31
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Published：2020-08-12 -
Design of the UHV Large Cross Section Differential Pumping System
Abstract：This paper presents a method of analysis and calculation for the UHV large section differential pumping system. A differential pumping system for the SR X-ray lithography beamline of BEPC (Beijing Electron Positron Collider) is calculated and designed.- 35
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Published：2020-08-12 -
The Effect on the Interface Shape by Thermal Conductivity in CaF2 Crystal Growth in Multi-crucibles by the Bridgman Technique
Abstract：In the Bridgman-stockbarger system with definite temperture field and main growth foctors, we study the growth of CaF2 crystal in multi-crucibles and find that the thermal conductivity of crucibles and the crystal have serious influerce on not only the interface shape but also the crystal scattering. On the basis of theory and experiment, we find out the right crucible and growth device.- 24
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Published：2020-08-12 -
Mechanical Design of a Pantograph Legged Mechanism for a Six-legged Walking Robot
Abstract：In this paper the selection of the type and the structure parameters of a pantograph locomotion mechanism for a six-legged walking robot is discussed in detail. We give a method to design the transmission system and the mechanical structure. A design basis for developing and making the practical locomotion mechanism of a sixlegged walking robot is provided.- 58
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Published：2020-08-12 -
The Ruled Plane Grating with Veried-space
Abstract：In this paper, the theory of ruled plane grating with veried-space is described, and important use of the grating in the spetral instrument is introduced.- 31
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Published：2020-08-12 -
Measurement Method of Circle Errors of the Variable Axis-neck
Abstract：Measurement principle of the errors of a variable axis-neck using V-type method is described. The circle errors and eccentricities for two sections of the variable axis-neck are accurately tested. Measurement method and calculating formula are given. Measured eccentricity is separated with the help of harmonic wave analysis. Finally a set of practical measurement data is presented.- 52
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Published：2020-08-12 -
Leak Coefficient Measurement for the Ultra-thin Beryllium Film
Abstract：This experiment employed mass-spectro-meter comparison method to measure the leak coefficient of ultra-thin beryllium film（d=18μm） of X-ray lithography beam line of Bejing Electron-Positron Colliding Device at a specially designed equipment. To enhance the sensitivity of leak detecting, preset leak detecting method was also introduced. The calculation results show that the leak efficiency is about 10-5Pa· m3/s. It is consistent with the leak efficiency data of the imported Berylliurn film given by the test sheet.- 27
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Published：2020-08-12 -
The Coordinate Measurment of Crossing Point Between the Optical Axis of Area CCD Camera Lens and Sensor
Abstract：This paper introduces a coordinate measurment method of crossing point between the optical axis of its lens and CCD sensor using a XC-77CE CCD camera as an example. Beacuse the two fields in vedieo signals are processed in frame, the measurement resolution is equal to that of the CCD sensor. Horizontal measurment accuracy is ?1.5 elements and vertical is ?0.5 elements.- 39
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- 9
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Published：2020-08-12 -
A High Accuracy Measurement Method of Geometry Size of CCD
Abstract：The paper describes a high accuracy measurement method of geometry size of CCD, with emphasis on the measurement purpose and the choice of the program. Finally the measurement data are given and analysed.- 47
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- 6
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Published：2020-08-12 -
A Real-time Clock in a IBM PC and It's Applications
Abstract：In this article, the principle of a real-time clock in a IBM PC microcomputer and it's applications in the rolling display of images with high resolution and the management of microcomputer workingtime are described.- 27
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Published：2020-08-12 -
Flame Coating of Alloy Powder Before the Laser Cladding
Abstract：Flame coating is one of the method for alloy powder treatment. Before the laser cladding. This paper describes the technical process and analyzes on the basis of experiments the factors which effect on the quality.- 32
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Published：2020-08-12
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