Showing papers in "Electro-Optic Technology Application in 2008"
Journal Article•
TL;DR: The rationale of Hyperspectral remote rensing and the development of instruments are introduced, and it is pointed out that the green camouflaged targets on woodland can be found by special spectrum identification.
Abstract: Hyperspectral remote sensing has the advantages of spectroscopic analysis and imaging,identifying targets with special spectrum and bringing new threaten to military equipments.The rationale of Hyperspectral remote rensing and the development of instruments are introduced,the advantages of Hyperspectral remote sensing in military detection,camouflage distinguishing and hot infrared detection are analyzed.It is pointed out that the green camouflaged targets on woodland can be found by special spectrum identification.Hyperspectral remote sensing can measure the true temperature and emissivity in hot infrared.The camouflage technique and equipments in existence can not meet the request of hyperspectral remote sensing camouflage.
11 citations
Journal Article•
TL;DR: Based on the knowledge of the working mode of infrared detector, the model of propulsion nozzle radiation,coating radiation, wake flame radiation and back ground radiation was established, and the total radiation luminance was derived as discussed by the authors.
Abstract: SBIRS is an important part of the National Defense System of United States,which is mainly for early warning and forecasting of ballistic trajectory in booster stage.Based on the knowledge of the working mode of infrared detector,The model of propulsion nozzle radiation,coating radiation,wake flame radiation and back- ground radiation is established,and the total radiation luminance is derived.The detecting range of SBIRS is an- alyzed.
3 citations
Journal Article•
TL;DR: In this paper, an infrared continuous zoom optical system for long wavelength is designed for 320×240 uncooled focal plane array, the zoom system is mechanical compensation LWIR, the relative aperture is invariant during the zoom process.
Abstract: For 320×240 uncooled focal plane array,an infrared continuous zoom optical system for long wavelength is designed.The zoom system is mechanical compensation LWIR,the relative aperture is invariant during the zoom process.The F number of the system is 1,and the zoom ratio is 4:1.The focal length of the system could be changed continuously.The optical system image quality is evaluated with ZEMAX optical design software,The results have shown when spatial frequency is 11 lp/mm,the zoom system in the whole foci has high image quality.
3 citations
Journal Article•
TL;DR: Ssome new optical methods of sur- face measurement are presented and the development trend is pointed out.
Abstract: With the development of nano-technology and IT technology,the surface topography measurement has been developedIt becomes more precise,faster and steadierBecause the original contact method cannot satisfy the higher needs,the optical method has been becoming the hot topicSsome new optical methods of sur- face measurement are presented and the development trend is pointed out
2 citations
Journal Article•
TL;DR: A brief overview of THz sources and detectors, especially the THz quantum cascade lasers (QCL), and their characteristics are presented with emphasis on their basic principle and recent research progress as discussed by the authors.
Abstract: A brief overview of THz sources and THz detectors,especially the THz quantum cascade lasers(QCL) and THz quantum-well infrared photodetectors(QWIP),and their characteristics are presented with emphasis on their basic principle and recent research progress.The prospects and limitations of THz technology in application are also analyzed.It is pointed out that the distance is one of the key factors for application of THz technology.If the degradation of THz radiation during the transportation in atmospheric troposphere could not effectively be solved,the application of THz technology on the earth or sea will be seriously limited.THz radar or telecommunication based on airborne or satellite has a promising future.
2 citations
Journal Article•
TL;DR: The function and the composition of the network interface module, which is based on 1553B standard and adopts BU-61580 chip design is introduced, and the hardware design is described in respects of interface circuit from the mainframe,BC functional circuit and RT/MT functional circuit.
Abstract: 1553B standard is widely applied to the aviation system with its reliable stability.A network interface module,which is based on 1553B standard and adopts BU-61580 chip design is introduced.The function and the composition of the network interface module are described.The hardware design is described in respects of interface circuit from the mainframe,BC functional circuit and RT/MT functional circuit,and the software design are described in respects of memory management and software flow.
2 citations
Journal Article•
TL;DR: In this article, the external features of surface objects are divided into mirror surface reflection, diffuse reflection and directional reflection, and three kinds of reflected characteristic curves are discussed, and several types of spectrum characteristics of surface features reflection are introduced.
Abstract: Based on the external features of surface objects,the objects reflection is divided into mirror surface reflection,diffuse reflection and directional reflection.In order to have a deep knowledge of the electromagnetic spectrum characteristics of surface features,three kinds of reflected characteristic curves are discussed,and several types of spectrum characteristics of surface features reflection are introduced.The factors influencing the spectral reflection characteristics of surface features are summarized and the work on remote sensing image analysis,counterevidence and application related to the field of high spectral imaging are done.
2 citations
Journal Article•
TL;DR: In this paper, the mechanical structure design of 800 mm visible light measurement of television sub-systems is introduced in detail, and the visible axis is qualitatively analyzed, where the formulas of axial error and the errors that produce axial errors are derived.
Abstract: The visible light measurement system is mainly used to the real-time measurements of visible light band,that is to say it tests the angular size from which the goal of field deviate the light axis,then sends it to servo system to form a closed loop.The tracker frame drives the tracking television measurement system to track the target to make the target miss volume reduced and keep the target locked in the field of television.The mechanical structure design of 800 mm visible light measurement of television sub-systems is introduced in detail,and the visible axis is qualitatively analyzed.The formulas of axial error and the errors that produce axial error are derived.
2 citations
Journal Article•
TL;DR: The development of high-tech reconnaissance have impelled the development of measures in target pattern painting camouflage, the shape and size of basic unit can be fixed based on the eye resolution and the principles of design pattern Painting camouflage.
Abstract: The development of high-tech reconnaissance have impelled the development of measures in target pattern painting camouflage.The threats of reconnaissance are analyzed,the shape and size of basic unit can be fixed based on the eye resolution and the principles of design pattern painting camouflage.
2 citations
Journal Article•
TL;DR: In this paper, a simple target simulation is made from the strong scatter, large volume is simulated by small size reflectors, which can improve the survivability effectively and achieve camouflaging and confusing.
Abstract: The simple target simulation is made from the strong scatter.Strong scatter,large volume is simulated by small size reflectors,which can improve the survivability effectively and achieve camouflaging and confusing.The common strong scatters are dihedral corner reflector and trihedral angle corner reflector,and so on.The Method of Moment(MOM) is used to compute their RCS,and the better strong scatters is selected by analyzing,comparing and calculating the results.
2 citations
Journal Article•
TL;DR: In this paper, the basic working principle of all optic fiber gyroscope is introduced, and the key techniques of each optical component are analyzed, some important resolutions for constructing optical way are discussed.
Abstract: The basic working principle of all optic fiber gyroscope is introduced,and the key techniques of each optical component are analyzed,some important resolutions for constructing optical way are discussed.As a new type of angle sensor,polarization-maintaining technology is used in the practical low measurement precision open-loop optic fiber gyroscope,and a PZT modulator is modulated by sine signal at shifting modulation.
Journal Article•
TL;DR: The optimizing method based on region growing is used to judge connecting area of image, and to achieve the extraction pattern, and the experiments show that the method can greatly reduce the dependence on the stack space and improve computing speed.
Abstract: The distribute characteristic of background image pattern which is the important basis for the implementation of camouflage,a method based on region growing is put forward to extract pattern of the background imageThe optimizing method based on region growing is used to judge connecting area of image,and to achieve the extraction patternThe experiments show that the method can greatly reduce the dependence on the stack space and improve computing speedThe method has a good value to the actual extraction of camouflage background image
Journal Article•
TL;DR: A new arithmetic of embedded image object identifying is discussed and shows that this embedded vision system has a simple structure, small volume, and can rightly identify the tracked color with the characteristics of good real time ability, running stabilization.
Abstract: Based on the CMOS image sensor,a new embedded vision system is designed which is composed of embedded controller AVRA new arithmetic of embedded image object identifying is discussedThe results show that this embedded vision system has a simple structure,small volume,can rightly identify the tracked color with the characteristics of good real time ability,running stabilization
Journal Article•
TL;DR: A diffractive-refractive infrared lens with large relative aperture for uncooled focal plane detector is designed in this paper, the wave band of the optical system is 8～12 μm, the focal length is 90 mm, the F number is 1, and the field of view is 10°.
Abstract: A diffractive-refractive infrared lens with large relative aperture for uncooled focal plane detector is designed.The wave band of the optical system is 8～12 μm,the focal length is 90 mm,the F number is 1,and the field of view is 10°.The system has only three lenses,based on the big negative dispersion characteristics of optics elements,diffractive surface is used to eliminate color difference,simplify the configuration and lighten weight.The optical system image quality is evaluated with ZEMAX optical design software,the system has high image quality and the data met the demand.
Journal Article•
TL;DR: The basic principle of pulse width modulation based on voltage space vectors is introduced, the expressions which can work the correlative parameter is given, and EV module of TMS320F2812 DSP is presented to generate SVPWM wave.
Abstract: The basic principle of pulse width modulation based on voltage space vectors is introduced,the expressions which can work the correlative parameter is given,and at the same time,EV module of TMS320F2812 DSP is presented.The wave of SVPWM can be generated easily by EV module.By using EV module to generate SVPWM wave can reduce the work of CPU in DSP.The flow chart of how to generate SVPWM wave is given,the advantage and disadvantage of this method throw the results from test are analyzed in the end.
Journal Article•
TL;DR: A definition of operating range of IR system is proposed based on quantum efficiency of detector and the equation relates to the resolution of the system, but does not directly relate to the system aperture, while the detection background effect to the detector is higher than the noises produced by the detector itself.
Abstract: Calculation of operating range of infrared systems is an important process before real system design.There are many kinds of calculation methods nowadays.A definition of operating range of IR system is proposed.Based on quantum efficiency of detector,the operating range equation of IR system is derived.According to the equation,operating range of IR system relates to the resolution of the system,but does not directly relate to the system aperture,while the detection background effect to the detector is higher than the noises produced by the detector itself.Experiment data show that the equation is congruous to the fact.