Chinese Version Light学术出版中心
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Issue 3 ， 2001
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Multiresolution Surface Construction
Abstract：Unstructured and highly detailed meshes need to be effectively represented in many applications. Accompanied with wavelets, hierarchical multiresolution meshes can be in charge of this effective representation. To perform this multiresolution representation with wavelets, an available function space needs to be constructed and defined over the general triangulated surface meshes. To employ an effective method to accomplish the construction of a continuous parameterization of arbitrary meshes over a simple domain is a key problem. The paper proposes a fast parameterization method based on geodesic polar map that can be effectively served in multiresolution surface construction. Compared with previous methods, the construction process given in the paper can save a lot of computation time and maintain fine visual result.Keywords：multiresolution surface representation;parameterization;geodesic polar map;wavelets- 61
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Published：2020-08-12 -
Image restoration algorithms based on singular value decomposition of 3-D optical sectioning microscopy
Abstract：The paper discusses the basic theory of optical sectioning microscopy, and also analyzes the ill posed problem caused by the degradation in fluorescence images resulting from the singularity of point-spread function circular matrix of the microscope system. By applying the singular value decomposition, the bigger eigenvalues are selected and the ill posed problem is solved. With the fast Fourier transform, this problem is transformed from space to frequency domain, which simplifies the computation process. Finally, a good result is achieved.Keywords：image restoration;optical sectioning microscopy;singular value decomposition;Fourier transform- 33
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Published：2020-08-12 -
Method of target recognition by wavelet transform
Abstract：Wavelet transform is characterized by multi-resolution, which presents Mallat pyramid structure. It coincides well with the way by which people distinguish object from coarse to fineness and from large to tiny. In addition, the wavelet transform also has many advantages,such as reducing image noise, simplifying calculations, and embodying target image characteristic point. This paper highlights a method of target recognition by wavelet transform.Keywords：wavelet transform;target recognition;pyramid structure- 36
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Published：2020-08-12 -
Effect of weight factor on B-spline curves
Abstract：By analysing geometrical meanings of the cubic rational B-spline weight factor, the paper presents a study of the geometrical characteristics of cubic rational B spline curves. It also discusses the effect of the weight factor on the shape of B spline curves, providing a way for constructing B spline curves for special requirements.Keywords：B-spline;weight factors;shape control- 62
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Published：2020-08-12 -
3D Reconstruction of aircraft blades with NURBS
Abstract：The paper presents the basic principle of non-uniform rational B-spline (NURBS) according to the data from an optical blade measurement system. By applying 3D graphic standard and library OpenGL, the drawing of blades on VC+ +6.0 platform has been accomplised.Keywords：D reconstruction;B-spline;curve;surface;OpenGL- 49
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Published：2020-08-12 -
Quantitative surface topography determination by differential interference contrast microscopy
Abstract：Quantitative surface topography determination by differential interference contrast microscope system is partly exploited in this paper. A new method of minishing phase difference β to zero caused by Nomarski prism in the system is effective and reliable. The reconstruction of three-dimensional surface topography of the sample, comparison of profile curves, and the system measuring accuracy are investigated in detail.Keywords：interference microscopes;phase contrast microscopes;topography- 67
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Published：2020-08-12 -
Analysis of the focusing error of sagittally focusing double-crystal monochromator
Abstract：The paper briefly introduces the monochromatic and structure principles, and also analyses the height error of the reflective beam of the monochromator in synchrotron radiation, which is decided by what the rotational axis and the angle between the diffracting surface of crystal and the slide depart from the theoretical position, and gets the relation between the width of the facula focused and the driving precision of the bender, offering the theoretical base for the installment and movement of the two crystals.When ΔS≤31μm、Δα≤1′, height error of the reflected beam is Δh≤25μm, when the travel of micropositioner is more than 1mm, the precision is less than 1.25μm and the width of the facula focused is less than 0.5mm, and when ΔR≤0.75%R(R is the curved radius of crystal), the crystal may not be beat.Keywords：monochromators;sagittally focusing;synchrotron radiation- 47
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Published：2020-08-12 -
Software correction of the optical measuring lens′ distortion in the CCD-assembly scanner
Abstract：The paper discusses scanning errors resulting from optical distortion of optical measuring lens in the multi CCD assembly scanner as the accuracy required better than 2mm. By testing and smoothed curve of every camera fitted line of trend's equation, a software for correcting the error is put forward. The results has proved that this method can reduce the error, and make the accuracy better than 2mm.Keywords：Scanners;lenses;distortion;software correction- 49
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Published：2020-08-12 -
Polishing technology of vacuum-induced lap
Abstract：The paper mainly describes the working function and basic principles of the vacuum induced polishing lap. In manufacturing a face sheet mirror in 120mm?120mm, with thickness to diameter ratio less than 1/60, the mirror deformation caused by the self weight of polishing lap, the support requirement for processing the mirror, as well as the key problems concerning the digital control manufacturing of the ultra thin mirror have been solved successfully.Keywords：vacuum induced lap;ultra thin mirrors;polishing;Digital control- 41
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Published：2020-08-12 -
Novel approach to generating optimal smooth trajectory for a manipulator
Abstract：This paper deals with a novel approach to generating optimal smooth trajectory. Giving the start point and the target point in the workplace of the manipulator,the authors put forward the minimal energy trajectory that minimizes the integral of squared acceleration in each ROF, which is solved by a numerical iterative procedure that is devised for a solution of a constrained boundary value problem. The results show that the planned trajectories are not only smooth but also safe with optimal velocity and acceleration profile.Keywords：robot manipulators;optimal trajectory;planning- 58
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Published：2020-08-12 -
Study of micromachined microstrip patch antenna
Abstract：The paper studies the silicon based micromachined microstrip patch antenna,and an air cavity fabricated by silicon micromachining. A mixed structure consisting of silicon and air cavity underneath the metal patch results in a low dielectric constant substrate. The equivalent dielectric constant of the mixed structure substrate and the relevant parameters of the antenna are studied. The calculated results are compared with the measured results.Keywords：micromachines;microstrip antennae;silicon- 32
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Published：2020-08-12 -
Coordinate model and calibration algorithm of multi-joint arm
Abstract：The focus of the paper is on the coordinate model and calibration of multi-joint type CMM. Begining with a generalized model of a pair unit, by which the coordinate model of a Multi-Joint Type 3D Scanner (MJT3DS) system can be easily deduced. The paper presents a new approach to the calibration of parameters in the model. Based on the real-valued genetic algorithm, the calibration algorithm is superior in many respects to the linear algorithm applying least square and iterative algorithm. The feasibility and robustness of this algorithm have been proved by computer simulation.Keywords：coordinate measurement;multi joint arms;calibration;genetic algorithm- 41
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Published：2020-08-12 -
Novel measuring method of solution concentration profiles
Abstract：A novel microscopic method(dark field type Schlidren method) for in situ mapping solution concentration profiles is presented in this paper. It was modified and improved by Schlieren method, and can be used to observe the variation of the solution concentration. In addition, the results obtained in the theoretical experiment, and comparisons with the results from a differential interference microscope are also provided.Keywords：Schlieren method;graded index;solution;concentration measurement- 39
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Published：2020-08-12 -
Improving angle-measuring precision and resolution of photoelectric rotary encoders using diffraction interference technology
Abstract：Photoelectric rotary encoder, which is also called photoelectric angle position sensor, is a kind of digital angle measuring device combining with optics, mechanics and electronics. The photoelectric rotary encoder has been used widely in the systems of fine angel position measurement, digital control and digital display. The photoelectric rotary encoders using diffraction interference technology (shortened form laser encoder) is characterized by compact structure, miniaturization, high accuracy and high resolution, and high frequency response. This paper analyzes a few kinds of successful schemes of laser encoders, and also expounds new headway and the technology problems concerned.words :photoelectricrotaryencoders;diffractiKeywords：photoelectric rotary encoders;diffraction interference;laser encoders- 45
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Published：2020-08-12 -
Research on optical fibre gyroes
Abstract：Along with the scientific advancement and technology updating, mechanical gyroes are being developed towards more advanced laser and optical fiber gyroes. Taking the close-loop testing of the integrated optical fiber gyroes as an example, the paper gives a discussion on the testing of the optical fiber gyroes theoretically. In addition, the working principles, some key technologies, as well as their developing trends are described in detail.Keywords：mechanical gyroes;laser gyroes;optical fibre gyroes- 59
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Published：2020-08-12 -
Model and imaging formula of the line structured light sensor
Abstract：The paper analyzes a model of the line structured light sensor, and also derives imaging formulas by matrix transformation way. Compared with the geometrical imaging method, the principle of the matrix transformation method is simpler, the meaning of the parameters is more intuitive, and the deriving process is more precise. Finally, the characteristics of the line structured light sensor are analyzed and several instructive conclusions are made.Keywords：structured light sensors;mathematical models;matrix transformation- 51
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Published：2020-08-12 -
Influence of the surface texture of the substrate glass on the display characteristics of STN-LCD
Abstract：The paper begins with an analysis of the relationship between the nonuniformity of the gap of the LC cell and the display rainbow of super twisted nematic liquid crystal (STN-LCD) based on the principle of birefringent interference and the human vision factor. And then it explains the influence of the surface texture of the ITO coating substrate glass on the display characteristics of STN-LCD. Practice has made known that the display rainbow of STN-LCD is mainly resulted from its manufacturing process.Keywords：STN-LCD;birefringence;float substrate glass;surface texture- 47
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Published：2020-08-12 -
New progress in semiconductor lasers and their applications
Abstract：Semiconductor lasers have become the most rapidly advanced laser technology in the last ten years. The paper introduces the present status of the semiconductor lasers,and also describes the applications of the semiconductor lasers in various fields, including laser radar, laser range finding, laser fuse, laser guidance and tracking, laser acquiring and warning, laser simulation, laser and optical fiber communication, optical fiber gyroes, and in the fields of the national economy.Keywords：semiconductor lasers;military applications- 62
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Published：2020-08-12 -
Theory and applications of varied line-space gratings
Abstract：Varied line space gratings(VLS) have great advantages in aberration correction,and the different spectral properties will be gained using the VLS with different rules of spacing. In this paper, the aberration correction principles of the gratings and their applications in the areas of vacuum ultraviolet, soft X-ray, high resolution photoelectric detectors, surface metrology and optical fiber communication is described. Finally, the potential of the gratings in the future is discussed.- 66
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Published：2020-08-12 -
Design of liquid crystal reticules of television tracking lenses
Abstract：The paper gives a method for designing a new kind of liquid crystal reticule. By placing the reticule in the main optical path of the TV tracking lens, it can not only take the place of the auxiliary optical path in displaying line of sight, but also simplifies the structure of the lens. In addition to describing the structure of the reticule, the paper also proposes some appropriate ways for solving the key technology problems in its development.Keywords：television tracking;lenses;reticules;liquid crystals- 37
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Published：2020-08-12 -
Optical limiting properties of ασ-π high molecular polymer
Abstract：The paper describes optical limiting properties of Si polymer with ασ-π electron conjugate tracks. The transmissivity and light intensity of the sample in different concentrations at 532nm had been measured. The results show that the polymer is characterized by good optical limiting properties. Finally, an effective two photon coefficient β=3.5×10-9cm/W measured by Z-scanning method is given.Keywords：optical limiting;polymer;Z-scan;Two photon absorption- 54
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Published：2020-08-12 -
New plastics used for near infrared filters
Abstract：In this paper,a new kind of near infrared absorbent synthesized with tungsten(Ⅵ)chloride and tributyl phosphate are introduced. By mixing this materials into methyl methacrylate (MMA),a new kind of near infrared plastic filter is prepared. The optical properties and properties of matter were tested. Nature ageing test, accelerated ageing test, thermal resistance ageing test were also carried out. The result indicates that this new kind plastic filter is characterized by high transmittance of visible light and high absorptivity of near infrared, making it stable to light and heat.Keywords：infrared materials;filtering plastics;infrared absorption;transmissivity- 28
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Published：2020-08-12
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