Chinese Version Light学术出版中心
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Issue 1 ， 2002
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Distributed network measuring system --new oriented advanced manufacturing measurement system
Abstract：With appearance of "agile manufacturing","network manufacturing" and "global manufacturing",a modern manufacturing system needs a new advanced measuring system.An advanced manufacturing mode is characterized by distribution, flexibility and agility, which decide the features of the distributed measuring system(DMS). Beginning with the summary of the fruitful results in advanced manufacturing and distributed measuring system, the paper discusses the key technologies of DMS such as architectures of integration systems,data transfer format,measuring equipment oriented network,analyses and control of systems.Keywords：measuring systems;network manufacturing;advanced manufacturing- 51
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Published：2020-08-12 -
Output signal analysis and processing of an electronic tunneling accelerator
Abstract：The principle of a new electronic tunneling accelerator is introduced and the desired component, the noise and the disturbance of the sensor’s output signals are analyzed in detail. With the LabVIEW virtual instrument development platform, the method of signal analysis and processing is designed. Based on the analysis of the output signals of the electronic tunneling, the related simulative signals have been simulated and processed,thus restraining the noise and deleting the power frequency disturbance. Finally the desired component concealed by the noise has been obtained.Keywords：electronic tunneling accelerators;signal processing;virtual instruments- 47
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Published：2020-08-12 -
Discriminance for the compatibility of screw fastener based on random Hough transform
Abstract：The paper proposes and realizes a new discriminance for the compatibility of screw fastener based on random Hough transform(RHT). In noncontact screw measurement via computer vision,the three-dimensional entity of thread was transformed into the two-dimensional orthogonal projection of thread using a CCD camera system, then the one-dimensional contour was extracted from the projectional image,and the projectional pitch diameters were calculated from the contour of the thread portion by random Hough transform. The paper also analyses the probability histograms of projectional pitch diameters in order to judge the compatibility of the screws. In comparison with the template matching method, the expensive experiment has proved that the RHT method is both correct and effective, which has laid a good foundation for automatic testing screw fasteners.Keywords：screw measurement;compatibility;random Hough transform;computer vision- 67
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Published：2020-08-12 -
Digital Moir? fringe scanning method for centering ring grating images
Abstract：Moire fringe scanning method of digital ring gratings is proposed. Instead of generating ring Moire fringe by superposition of real circular grating and nondiffractive beam, the author photographed the beam images into computer,and then superposed them with a digital circular grating, whose center position is close to the measured images. Changing the phase of digital grating can realize Moire fringe scanning. The global center of beam pattern can be calculated by multi-frame scanning images. Because the total data of pattern are used in calculation, the determination of center of the ring pattern with noise is realized with subelement sensitivity. Statistical analysis shows that this method features good anti-interference ability. The application of this method in the measurement of space straightness error is also introduced.Keywords：Moire fringe;nondiffractive beams;positioning;digital image processing- 63
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Published：2020-08-12 -
Fault detecting technology based on neural network algorithm
Abstract：The paper describes an automatic on-line detecting system which can detect inner parts of complex electromechanical products. In the system,digital image processing technology is used to preprocess X-ray images of the products, and neural network algorithm is applied to diagnose faults. The fault recognition model adopts an improved back-propagating neural network, which is trained by a series of standard X-ray images of correctly assembled products.During the process of detection, two images of objects in different directions are capable of acquiring the status of the key parts. After comparing the features of the two preprocessed images and standard images,the network can estimate different types of faults of the key parts. The detecting system combines digital radiography technology with digital image processing, and applies the back-propagating neural network algorithm in the fault recognition process. The system improves the speed and reliability of fault detection and has practicability in the field of industrial nondestructive detection.Keywords：nondestructive detection;fault diagnosis;neural networks;image processing- 49
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Published：2020-08-12 -
Development trend of azimuth aiming system of ballistic missiles abroad
Abstract：Along with the development trend of ballistic missile tending to solid rocket engine, mobile launching,advanced guidance technique,straight shoot,short flight time,small volume,preferable mobile,rapid response speed and powerful breakthrough ability,the missile aiming technique is also developed. In this paper,three kinds of typical missile aiming systems abroad are introduced,including railway mobile,launched missile under silo and submarine-launched ballistic missile. Because the missile azimuth aiming has a great influence on the precision of missiles,there is a growing interest in developing the missile aiming technique in many countries. Furthermore, the paper also discusses future development of the missile aiming technique.Keywords：missile aiming;azimuth aiming;mobile launching;development situation- 61
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Published：2020-08-12 -
Flatness evaluation based on real-coded genetic algorithm
Abstract：A real-coded genetic algorithm is proposed to solve the form evaluation of planes.According to the mathematical definition of dimensional and tolerancing principles,a mathematical model of flatness evaluation in accordance with the minimum zone condition is presented and the fitness function of genetic algorithm is given.Then the implementation steps of the algorithm are dwelt on. Based on the real-coded method,the genetic operation is composed of roulette wheel selection,real-valued simple crossover and uniform mutation.Finally the data in literature are verified by the proposed approach.The results show that the algorithm is superior to others in terms of efficiency and quality of solution in the field of dimension and tolerance evaluation.Keywords：flatness measurement;real-coding;genetic algorithm- 53
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Published：2020-08-12 -
High-precision noncontact position measuring system
Abstract：Along with the advancement of missilery, the requirement for the precision of positional measuring system is in incessant development. The paper introduces the actualities of positional measuring system and a new noncontact position measuring system. In addition to educing a new measuring method, i.e. trigonometric measuring theory, the paper also surveys the positional relationship between the emissive vehicle and loading vehicle. With the knowledge of trigonometry and error theory, the precision,length(X,Y,Z)±1mm and angle(α)±3′ are analysed.Keywords：positional measuring systems;noncontact position measuring systems;trigonometry- 66
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Published：2020-08-12 -
Effects of transfer function of profilometer on roughness measurement of ultra-smooth surface
Abstract：Root-mean-square roughness is one of the most important figures that is used to characterize the ultra-smooth surfaces. Many experimental results show that different types of profilometers usually give different results, which make it difficult to compare them. In this paper, the effects of the transfer function of a profilometer on the roughness measurement of ultra-smooth surfaces are analyzed based on linear system theory and simulated with the discrete Fourier transformation method. The results show that because of the limited bandpass of the profilometer, the measured root-mean-square roughness is always less than the real roughness of the surfaces.Keywords：finish measurement;ultra-smooth surfaces;transfer function;linear systems- 48
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Published：2020-08-12 -
Mechanism research on thermo-chemical polishing of diamond
Abstract：Having finished thermo-chemical polishing on diamond’s surface, the authors used an atomic force microscope to observe the microstructure on its surface,and made a checkout on the result with scanning electronic microscopy. By using X-ray photon-electronic spectrum technology, the authors made a comparative analyses on each of the two different zones of the iron plate in several aspects, and preliminarily ascertained the physical and chemical reactions and resultants during the polishing process. Based on the work, the authors systematically probed into the mechanism of the thermo-chemical polishing. Finally, the reasons for flat ground surface and grooves appearing on the diamond’s surface were found out. The given explanation matches well with the observed results.Keywords：diamond polishing;thermo-chemical polishing;atomic force microscopes;X-ray photoelectric spectrum- 56
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Published：2020-08-12 -
Effect of the voltage amplitude on moving performance of PZT in-pipe bimorph micro robot
Abstract：A micro robot carrying a CCD camera for inspecting the inner wall of a small pipe has been developed. Its actuator is composed of a PZT bimorph driver and two pairs of brass elastic supporting legs. The structure and the moving principle of the robot are studied, and the influence of the voltage is analyzed in particular. According to the simulation and FE analysis, it is concluded that with the increase of the voltage, the amplitude of the actuator will increase as well as the speed of the robot. Experiments have been carried out to prove the conclusion, which is important in improving the inspection efficiency of the micro robot.Keywords：in-pipe micro robots;piezoelectric actuators;simulation;speed;driving voltage- 61
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Published：2020-08-12 -
Reflective optical fiber micro-displacement sensor and its application to the measurement of teeth chewing in real-time
Abstract：Reflective optical fiber displacement sensor has the advantage of low requirement to the measurement environment. It can meet various special situations which cannot be finished with normal methods, and is also characterized by large measurement range and high measurement resolution. The working principle of the sensor is discussed briefly,and a kind of sensor and a small reflective face have been designed for the special requirement of the teeth chewing movement measurement. A system for teeth chewing status measurement was set up and specific calibration was made for this system. The real-time measurement result during teeth chewing is obtained, which is the first time that the teeth chewing dynamic measurement in the dental measurement area has been realized. The paper discusses the factors which effect the measurement precision and the special measurement environment in oral cavity, and some methods for reducing errors and error analyses are also given.Keywords：optical fiber sensors;displacement sensors;real-time measurement;teeth chewing- 45
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Published：2020-08-12 -
Design of an analog Sigma-Delta regulator and its simulation
Abstract：When the number of the integrator in a Sigma-Delta regulator’s forward path is L, the regulator is called L-step Sigma-Delta regulator. Based on the linear model of the regulator given in the paper, the design of the regulator is attributed to the design of a linear filter net and a nonlinear quantifier with the consideration of input noises. In this way, the system stability is ensured, and the quantified noise in the basic frequency band is also decreased to minimum. The optimized quantified noise shape is obtained and the white noise is put into high frequency band. Furthermore, the noise transfer function (NTF) is designed and optimized. Finally,a 5-step Sigma-Delta regulator is simulated. The results show that the revolution of the regulator depends on the zero-pole distribution property of the NTF. The design method proves feasible and the simulation data is of great importance to the regulator design.Keywords：regulators;noise transfer functions;quantification;simulation- 47
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Published：2020-08-12 -
Research on single-ring absolute encoder and its applications
Abstract：Single-ring absolute encoder is one of the latest techniques in the world. The method using black-white stripe to encode in single ring absolute encoder has made a breakthrough in the conventional encoding principle. The absolute encoder can be implemented by sensor fusion, image processing, computer control, etc. In this paper, the fundamental principle and theoretical basis of the single-ring absolute encoder are specified, and the system hardware design is illustrated. The experimental results show that both the system design and its theoretical basis are correct.Keywords：absolute encoders;single-ring encoders;grating encoding;system design- 52
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Published：2020-08-12 -
Optical fiber Bragg grating sensing technology
Abstract：The paper reviews the sensing principle, fabrication techniques of fiber Bragg gratings （FBG） and their applications in sensors. Two solutions to temperature and strain crosssensitivity, which are intrinsic problems of FBG,are described in detail. With these solutions, more accurate information about strain and temperature can be obtained simultaneously. The FBG’s application-3s system and the problems met in the project are mentioned. It is demonstrated that the FBE used in sensing technology is superior to other technologies.Keywords：fiber sensors;fiber Bragg grating;cross-sensitivity- 60
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Published：2020-08-12 -
CMOS digital imaging technology and its applications to image monitor in power system
Abstract：Image sensor is the key component in image monitoring systems. CMOS digital color/black and white sensor and digital signal processor constitute a minimum system of digital vidicon, which replaces analog vidicon, and can be used to collect image information. The paper introduces the structure and principle of digital imaging technology based on CMOS digital sensor. In light of the power system, the applications and the development of digital imaging technology in real-time image monitoring systems are clarified.Keywords：image sensors;digital imaging;real-time monitoring;CMOS;power systems- 66
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Published：2020-08-12 -
Study of method for generating ideal edges
Abstract：A method for generating an ideal edge line is introduced in detail. In subpixel edge extraction algorithm, the accuracy of subpixel algorithm without noise and the ability of the algorithm to resist noise under noisy circumstance should be considered and examined separately. The ideal edge introduced in this paper can be used to examine the subpixel algorithm. Based on the principle of imaging formation of CCD camera and the square aperture sampling theorem, a calculation method of gray level of boundary points is given. Furthermore,calculation formulas of boundary points’ gray level are presented in a specific condition. It is convenient to generate an ideal edge using these formulas, which can be used in the validation of subpixel algorithm.Keywords：image measuring systems;gray level;calculation methods;square aperture sampling- 89
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Published：2020-08-12 -
Processing method of CR image based on fuzzy set theory
Abstract：The digital CR image can be divided into object region and background region,and useful information about diagnosis is in the former one. In image processing, the two regions should be treated with different ways. In this paper,a fuzzy set is used to describe the two regions, and the membership degree function is established by fuzzy statistics. The image processing model based on the fussy set theory is constructed and the processing method is given in detail. Experimental results show that the proposed methods are both effective and feasible. In the processed images, medical information is impressed clearly, thus improving the diagnosis accuracy.Keywords：image enhancement;fuzzy sets;membership degree functions;CR images- 33
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Published：2020-08-12 -
2.4GHz WLAN technique and its applications in mountain areas
Abstract：Wireless local-area network (WLAN) is an important part in computer networks. Based on the experience in building WLAN in a mountain area county, the author analyses the direct sequence spread spectrum in WLAN transmission technique, the composition of WLAN and their applications,as well as the standard of WLAN. Besides high speed of data transmission, good mobility reliability and resistance to disturbance, the WLAN does not require wiring,and has become the compensation and extension to the wire network.Keywords：wireless local-area networks;mountain areas;applied engineering- 40
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Published：2020-08-12 -
Research on e-commerce system based on iPlanet middle-ware technology and its applications
Abstract：With the prevalence of e-commerce based on Internet technology, the traditional Client/Server two-layer architecture is not applicable to the requirement of more complicated and flexible large-scale business, and is being gradually replaced by three-layer or multilayer architectures, among which the three-layer architecture adopting application server as its middle-ware has been applied widely in e-commerce system. The popular iPlanet middle-ware technology is mainly discussed in this paper. By a system of electronic commerce system, supporting Web was designed by combining the opening, cross-console and cross-language capabilities of the iPlanet middle-ware integrated framework.Keywords：e-commerce systems;application servers;iPlanet;Enterprise Java-Beans- 57
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Published：2020-08-12 -
Effect of space environment on the dimension stability of optical remote sensor
Abstract：The development of modern technology and modern military has gradually required the ORS (optical remote sensor) of higher resolution. In this paper, the dynamic and the thermal environments during launch and in-orbit stages, and their effects on dimension stability of ORS are analyzed in detail. It is useful for improving sensors resolution, and this work can be served as reference for engineering projects.Keywords：optical remote sensors;dimension stability;space environment;performance evaluation assessment- 53
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Published：2020-08-12 -
Analysis of the imaging characteristics and scanning traces of the 45? rotating scanning mirror
Abstract：Based on the vector theory of optical reflection, the imaging characteristics and scanning traces of the 45°rotating scanning mirror are analyzed, and the 45°rotating scanning mirror’s reflection matrix is deduced. The relationship between objects and images of the 45°rotating scanning mirror imaging, and the calculation methods for imaging rotation and the scanning traces on the ground are also given in detail.Keywords：rotating scanning mirrors;multi-pixel parallel scanning;image rotation;scanning trace- 57
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Published：2020-08-12 -
Optimum design of space cameras based on finite element method
Abstract：Optimum design is an effective method for improving design,and the finite element method is a powerful tool for solving and analysing problems met in the course of design. Optimum design combined with finite element method is introduced,which has been applied to the design of a certain space camera .Keywords：space cameras;finite element methods;optimum design- 51
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Published：2020-08-12
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