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Issue 2 ， 2001
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Current status and development of multi robot coordinative and cooperative systems
Abstract：With the application mode of robots changing from cell to system, the cooperation and coordination of robot systems are more important. In the paper, the relationship between cooperation and coordination, and the trend in this field are discussed. Finally, the authors put forward some opinions based on the concept of a multi-agent system and also point out that the multi-agent system is an important direction of multi-robot systems in the future.Keywords：multi-robots;coordination systems;cooperation systems;multi-agent systems- 42
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Published：2020-08-12 -
Long period fiber grating and its new applications in communication and sensing
Abstract：Long period fiber grating(LPFG) is a new kind of optical fiber element. The paper presents its mode coupling mechanism, the fabrication methods as well as its applications. The coupling is between forward propagating core fundamental modes and forward-propagating cladding modes. By transverse exposure, periodical modulation of refractive index is formed along the axis of optical fiber. Ideas about applications of LPFG to band pass filters, optical add/drop multiplexing, optical fiber sources, coupling of fibers, optical fiber polarizers and novel sensing are illustrated. In comparison with other schemes, advantages of the LPFG based devices and an important role of the LPFG in communication and sensing technology are demonstrated in detail.Keywords：long period fiber gratings;resonant wavelength;separation between dual resonant peaks;optical fiber communication- 44
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Published：2020-08-12 -
Manufacturing of high efficient holographic diffraction gratings
Abstract：In light of the manufacturing principles of holographic diffraction gratings, the paper presents a main method of manufacturing the holographic gratings. In comparison with ruling gratings, the holographic diffraction gratings have many advantages. Using the coupling wave theory and ion etching, the design and efficiency of the gratings have been optimized and improved, respectively. The paper also gives various key technologies in manufacturing high efficient holographic diffraction gratings in detail.Keywords：holographic gratings;ion-etching;diffraction efficiency- 58
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Published：2020-08-12 -
Overview of imaging stabilization
Abstract：In pace with the development of optoelectronic surveillance, tracking and reconnaissance systems, the requirement for image stabilization becomes more and more important. In fact, the image unstabilization is caused by displacement between the LOS of camera and the objects, including translation and angle rotation, in which, the rotation has special influence on images. The paper discusses two kinds of available image stabilization methods and the modern may for electronic stabilization, and also gives analysis on the platform stabilization method and key technical problems in the applications of the electronic stabilization methods.Keywords：imaging;image stabilization;line-of-sight- 51
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Published：2020-08-12 -
Analysis of correlation jam in the remote sensing image based on the transformed space Hough algorithm
Abstract：Since the correlation jam has a serious influence on the feature extraction of remote sensing images, as well as on the precise identification of the remote-sensing ground-objects, the paper not only presents small-and large-visual angle models, but also gives corresponding transform space Hough algorithm on the basis of the quantitive analysis of the amplitude and the phase. Compared with the methods of neighbour average, median filtering and classical frequency space filtering, the algorithm proposed in the paper is useful in removing the random-phase jam of the images, reserving richer fine textures and edge information and getting higher PSNRs. The algorithm has been applied successfully to the real time aquisition and processing system for remote sensing images.Keywords：transformed space analysis;Hough transform;remote sensing image;correlation jam;random amplitude;random phase- 57
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Published：2020-08-12 -
Optical system of a desktop rapid prototyping and manufacturing system
Abstract：The paper mainly introduces a design process of the optical system of the desktop rapid prototyping and manufacturing system. Compared with several kinds of light sources, a computer-controlled UV lamp is used because of its high quality and low cost. The beam of UV light is focused into an optical fiber through an ellipsoid lens and taper lens, etc., then shines down the surface of resin after diffusing, collimating, focusing, filtering stray lights. The fiber is fixed on a workbench controlled by computer to manufacture the parts automatically. The optical system is characterized by low cost, high quality light beam, stabilization and utility.Keywords：rapid prototyping and manufacturing;optical systems;UV lamps;computer control- 46
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Published：2020-08-12 -
Design of modified Wollaston prisms
Abstract：The paper introduces a kind of modified Wollaston Prism, including its wedge angle γ, thickness ω, optical axis inclination angle δ, and the formulas of designing the optical system based on these parameters. Using Matlab software developed by the authors, two relational expressions indicating the inflection of the wedge angle and the optical axis inclination angle both on the splitting angle ε and the plane of apparent splitting inclination angle η were calculated. By analysing the result, some useful conclusions were obtained, and the limitation of the original Wollaston prism was conquered, therefor, extending its applications.Keywords：Wollaston prism;optical systems;splitting angle;plane of apparent splitting- 32
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Published：2020-08-12 -
Inertia-friction based 4 D.O.F. microactuator driven by PZT
Abstract：An inertia friction based 4 D.O.F microactuator driven by PZT is presented. The 4 D.O.F microactuator prototype made based on an experiment and its kinematic characteristics are discussed. The experiment proves that it is feasible to apply the driving principle to the microactuator. The microactuator is linear and controllable at the frequency between 0 to 3000 Hz of voltage. The existing design problems and the future research on the microactuator are discussed as well.Keywords：inertia;piezoelectric ceramics;microactuators- 51
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Published：2020-08-12 -
Applications of novel optical fiber sensors in manufacturing precision products
Abstract：Based on the newly developed laser optical fiber sensor, the small step products and grooves machined by precision processing were experimentally measured according to the laser reflex principle. By making full use of the outstanding merits of the laser optical fiber sensing technology, a non contact, high speed inspection for the precision products is realized. The longitudinal resolution of the sensor can reach 0.4μm, and the positioning accuracy is better than ±2μm.Keywords：optical fiber sensors;precison finishing;laser;non-contact inspection- 52
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Published：2020-08-12 -
Fiber point diffraction interferometer
Abstract：A method implementing point-diffraction interferometry based on fiber is proposed. Two fibers transmit reference wave and testing wave, respectively, the high quality diffractive spherical wavefront created by single mode fiber can be used for measuring super-precision surface. Compared with conventional interferometers,the configuration is easier and less error.Instead of the traditional standard surface, the fiber will provide high quality reference wavefront.Keywords：interferometers;point diffraction;phase-shift;optical fibers- 52
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Published：2020-08-12 -
DSP based counting and ultra-precision subdivision of Moir? fringe with wide dynamic range
Abstract：A method of counting and subdivision of Moiré fringe is provided to implement precision displacement measurement. The counting and subdivision of the fringe are completed in DSP (digital signal processor), so it can solve the problem that counting circuit can't match the subdivision system properly by logical judgement. Because of utilizing high-speed optoelectronic converter and flash sample technique, the system can process Moiré signal with wide frequency range. The example demonstrates in the paper can count and divide signals from DC to 1MHz, i.e. If the optical sensitivity of the signal is 1 fringe per μm, the fastest measuring speed can reach 1000mm/s, and the highest resolution is in nm level. The experimental result shows that the software solution has high accuracy and sound reliability.Keywords：Moir? fringe;counting;subdivision;digital signal processing- 82
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Published：2020-08-12 -
Measurement of surface roughness by scattering method
Abstract：The paper describes scalar and vector-scattering theories.Using a soft X-ray reflectometer, the super smooth surface has been measured by scattering method, and the roughness of super smooth surface has been calculated by means of scalar and vector scattering theories. The calculating results are in accordance with those measured by WYKO.Keywords：soft X-ray;scattering;super-smooth surface;roughness measurement- 54
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Published：2020-08-12 -
Testing rotating errors of axis with reversal method
Abstract：In addition to describing a course of testing rotating error of high precision axis with reversal method,the paper also introduces all kinds of testing methods, especially the testing process of the rotating error of axis in manufacturing laser direct writing of binary optics elements. The rotating error of the axis measured is 0.018μm. This paper gives the testing theory, the way to separate the error and the practical applications in detail. Several factors that affect the reduplication of consequence are summarized. Finally, the authors conclude that the method is not only simple and practical, but also very accurate, being suitable for mechanists.Keywords：rotating error of axis;reversal method;error separation- 42
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Published：2020-08-12 -
Design of multichannel digital shutter velocity testers
Abstract：The multichannel digital shutter velocity tester is mainly used in measuring the exposure time of a camera curtain shutter. Photoelectric receivers are placed at different points in the focal plane, by which the optical signals are converted to electric signals. The test system collects the electric signals through high speed collection channels by the preset order with DMA mode. After data processing, exposure time acquired by the method given in this paper is analysed and measured. The test system is not only accurate, but also reliable. The test results can be visualy displayed on the screen.Keywords：curtain shutters;multichannel shutters;speed measurement;transient data collection- 48
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Published：2020-08-12 -
CNC grinding model and technology of an equal spiral angle cone ball end miller
Abstract：The complexity of complex-shaped tools'structure makes the tool grinding process difficult. Taking the“equal spiral angel cone ball-end miller”as an example, the continuity of space curves in the cone and the ball, and the tools'structure and machining characteristics are analysed and studied in detail. Using Frenet frame to locate the grindstone, the interpolation was implemented by using real coordinate to control machine tool. The result was tested in the grinding experiment.Keywords：cone ball-end mills;equal spiral angle;Frenet-frame;processing technology- 46
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Published：2020-08-12 -
MgF2-overcoated aluminium films for ultraviolet and vacuum ultraviolet
Abstract：MgF2-overcoated aluminium films are often used in the spectral range of vacuum ultraviolet. According to the theory of electromagnetism, reflectance of Al+MgF2 at normal incident was calculated in the way of matrix optics where the optical constant of MgF2 was taken as a complex number. The effect of thickness of MgF2 on the reflectance of Al+MgF2 coatings was considered. The MgF2 not only prevents the aluminum from being oxidized, but also increases the reflectance of Al+MgF2 by interference. The reflectance of Al+MgF2 at incident angle of 10°from 150nm～340nm is above 80% which was measured by Seya-Namioka UV-VUV reflectometer. The reflectance of Al+MgF2 does not change distinctly after the aging of one year or keeping at the temperature of 55℃ for 12 h. The paper also discusses the preparation of Al+MgF2 films.Keywords：coatings of Al+MgF2;Ultraviolet;vacuum ultraviolet;reflectivity- 42
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Published：2020-08-12 -
Transparent conductive film (ITO) deposited by IAD
Abstract：In addition to describing the conduction and growing mechanism of ITO films, the paper also discusses the influence of the ratio of indium to tin, the oxygen partial pressure, the substrate temperature and the evaporation rate on electrical and optical properties of the ITO films prepared by ion aided deposition. Under the optimized preparation conditions, electrical resistivity is about 3.0?10-4cm, and the average visible transmittance is better than 80%. By an atomic force microscope, the surface of the film had been examined.Keywords：ITO films;ion aided deposition;oxygen vacancies;vapour partial pressure;atomic force microscopes- 40
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Published：2020-08-12 -
Environment experiment of dynamics of space optical subassemblies
Abstract：Dynamics environment is a very important factor for the development of space optics remote sensors because it can bring about damage to the structure of the equipment and its subassemblies. For this reason, environment experiments of dynamics have to be adequately carried out during its different stages of the development. The space optics remote sensor, being a subsystem for executing significant task, has special requirements for its structure, behavior, operating precision, seal, reliability and so on. The whole equipment as well as its subassemblies have to be not only strictly examined through dynamics environment experiments, but also should be tested by other relevant experiments. According to their characteristics and conditions, an experiment document was worked out for the equipment and its subassemblies, and some technique issues and measures concerning control of vibration, inspection of response, linking jig, fixing of object tested, safety precautions in the experiment were analyzed and discussed.Keywords：space optical subassemblies;dynamic environment;experiment- 40
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Published：2020-08-12 -
Solar simulation technology
Abstract：The paper presents the design reference and the basic concepts for studying solar simulation technology, and also gives formulas concerned. An optical system structure and basic principles in solar simulation technology, collector optimization design and increasing system collective efficiency are discussed, respectively in detail. The effect of the optical integrator on the system irradiance nonuniformity is analysed, and the two optical integrator structures and the relative calculating formulas are given.Keywords：solar simulation technology;solar simulators;homogeneous illumination- 66
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Published：2020-08-12 -
New type gyro-theodolite and its applications
Abstract：A new type gyro-theodolite scheme based on the fundamental law and kinematic behavior of gyroscope is presented. In this scheme, a mechanics model of high speed gyroscope rotor has been established, by which the angular velocity of earth rotation was educed. The advanced CCD optoelectricity measuring technology was adopted to sample the data of principle curves, and the real north of surveyed point was calculated with the least square method. The coordinate azimuth of the missile, which is going to be launched, was determined. The gyro-theodolite system is especially suitable to military applications because of its fast reaction, high precision and low cost.Keywords：gyro-theodolites;least square methods;mechanics models;CCD optoelectricity measuring technology;real north;coordinate azimuth- 33
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Published：2020-08-12 -
Design of a high precision electronic steelyard data sampling system
Abstract：The paper introduces a data sampling system of high precision electronic steelyard, and also presents the design of hardware and software work principles of the data sampling system, especially, the design of strain-transition, forward signal amplifier and filter. Finally, the paper gives an anti interference design of the hardware and software.- 46
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Published：2020-08-12 -
Application of LM135 semiconductor temperature sensor to helicopters'temperature measurement
Abstract：Using LM135 semiconductor temperature sensor, CPU and digital tube interface, a digital display free air thermometer for helicopters has been developed sucessfully, which will take the place of the bimetal pointer thermometer. It has been known from the tested results that the LM135 semiconductor temperature sensor has achieved the single shot calibrated in -55℃~70℃, and the nonlinearity in -55℃~60℃ can be calibrated by single shot compensation calibration.Keywords：semiconductor sensors;temperature sensors;helicopters;temperature measurement- 56
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Published：2020-08-12 -
Applications of CORBA in the design of distributed MEMS CAD system
Abstract：The development of CAD used in micro-electro-mechanical system software is still in an initial stage.How to start on a high point depends on the degree of acquaintanceship to the previous analogous system and to the current technology. By assimilating the past CAD system designing experience,this paper puts forward a distributed CAD software scheme based on the standard of CORBA(Common Object Request Broker Architecture) focusing on language independency, platform-independency,model independency and network performance stability.Keywords：micro-electro-mechanical system(MEMS);computer aided design;common object request broker architecture- 34
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Published：2020-08-12
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