Abstract:提出了一种改进型螺旋微带谐振单元（sCMRc）的结构．该改进型螺旋微带谐振单元具有微带并联开路线，在低频通带内通过设计达到50Ω的端口阻抗．同时，并联的微带开路线在SCMRC结构的禁带中谐振，来实现更强的慢波效应和更宽的禁带．实际设计、制作和测试了该改进型螺旋微带谐振单元，该滤波器在低频通带内具有低插入损耗、改善的回波损耗，以及在较小面积下的宽禁带．

Abstract:The research results of dry technique on the etch pattern of forming micro-mesa arrays for HgCdTe IRFPAs(Infrared Focal Plane Arrays) detector were presented.The available RIE equipments and etch principle were analyzed respectively according to the characteristics of HgCdTe epitaxial material in detail.The influences of etching gas ratio,chamber pressure,ICP(inductively coupled plasma) power and RF(radio frequency) power on HgCdTe etch pattern were investigated by using ICP enhanced RIE(reactive ion etching).Then a stable dry etch technique is obtained with clean and smooth etch surface,good pattern profile,good uniformity and high etch rate.

Abstract:A new structure that can decrease the crosstalk of planar HgCdTe(MCT) Focal Plane Arrays(FPA) was investigated theoretically.In order to improve the property of FPA,the geometry of the FPA's substrate was designed to increase the spectral response and to decrease the crosstalk.The method of structural optimization was established.The two-dimensional simulation of Hg_(0.78)Cd_(0.22)Te devices was performed by using a device simulator.The results of calculation indicate that the spectral response increases 9.6%,and that the crosstalk decreases down to 1.05% from 5.23% when minority carrier lifetime is 10ns.

Abstract:采用高压电脉冲触发反转技术自行制备了PPMgLN晶片作为非线性工作介质，实现了一台以工作波长为1．0641xm被动调QNd：YVO4激光器作为泵源，输出信号光波长在1．4μm-1．7μm的光参量振荡器．采用畴周期调谐和温度调谐相结合实现了输出信号光波长在1．425μm～1．69μm波段的连续调谐．在泵浦功率为8．66W，调Q频率为20KHz时得到输出信号光和闲散光总功率为2．07W，斜率效率达到30．7％．

Abstract:A new method which was based on principal component analysis(PCA) and artificial neural network(ANN) was developed to discriminate the varieties of silkworm eggs nondestructively by visible and near infrared spectroscopy(Vis/NIRS).Principal component analysis(PCA) was used to analyze the clustering of silkworm egg samples,and offered the principal components of silkworm egg samples.The score plots of first and second components show that PCA can provide the reasonable clustering of the varieties of silkworm eggs,and can be used to analyze the silkworm eggs varieties qualitatively.The scores of the first 6 principal components computed by PCA were applied as the inputs of a back propagation neural network with one hidden layer.100 samples from four varieties were selected randomly to build BP-ANN model,and then the model was used to predict the varieties of 20 unknown samples.The discrimination rate of 100% was achieved.It indicates that this model is reliable and practicable.So this model can offer a new approach to the fast discrimination of varieties of silkworm egg.

Abstract:Utilizing near-infrared spectroscopy for non-invasive blood component concentration sensing has been a focusing topic in biomedical optics applications.But,there is no report about any successful detection techniques that can satisfy the requirements of clinic application(except the blood oxygen). One of the most important difficulties is the effect of the individual discrepancy.Dynamic spectrum(DS) is a new detecting method for blood spectrum developed in recent years.The improvement of accuracy by DS was studied compared with the traditional way here.The errors of traditional NIR non-invasive blood component concentration decision were studied based on the measure theory.Then the way of eliminating these errors by DS was analysed.Our conclusion is that the DS method can improve the accuracy of non-invasive blood component concentration measuring.

Abstract:The step-loaded rectangular waveguide grating slow-wave system, a new type slow-wave structure for mm-millimeter TWT, was presented in this study. And the dispersion equation and coupling impedance of this circuit were obtained by means of the approximate field matching theory, in which the high order terms of the field expansion in the groove region were considered, and the jump conditions at the interface of two neighboring steps and the matching conditions at the interface between the loaded region and the interaction region were employed. The high-frequency characteristics of the fundamental wave were discussed and the influence of various circuit parameters on high-frequency characteristics was also investigated. The results of the numerical calculation show that it is very useful for improving the high-frequency characteristics by loading the steps. The specific design-parameters can be selected according to the different needs. The present analysis will be helpful for further study and design of this kind RF system.

Abstract:The conception of micro-Doppler rate was introduced. Micro-Doppler was investigated for typical targets of micromotion. Then time-frequency analysis was used to extract micro-Doppler signature, based on which an approach was proposed for estimating motion parameters. A simulation of micro-Doppler was presented for typical targets of micro-motion. The result of emulation validates the theoretical analysis.

Abstract:A new algorithm based on third-order cumulant was proposed to detect a moving dim infrared target under heavy background.Because the grey-scale value of a pixel in an image has fluctuation when a target passes by,this fluctuation can be viewed as a non-Gaussian weak transient signal,and its third-order cumulant can be calculated to detect this signal.The process of average-value-subtraction in the estimation of the third-order cumulant also suppresses the background clutter,and leads to a great improvement of the signal to clutter ratio(SCR) and the probability of the detection in single frame.The experimental results show that the algorithm can effectively suppress heavy clutter background and reliably detect dim infrared targets when SCR is larger than 1.

Abstract:A novel planar dual-mode bandpass filter with double-comer cuts was proposed on the basis of traditional square patch dual-mode filter. The proposed structure has single patch resonator without coupling gaps, and two attenuation poles can be implemented on both sides of passband. The filter can also provide a low loss. An improved novel dual-mode elliptic-function passband filter with a pair of unequal crossed slots was also proposed. The return loss of this filter is 31.53dB at the center frequency of 1.8GHz, and the minimum insertion loss in passband is O. OldB, and the 3dB relative bandwidth is 19.44%. The results show that this filter can reduce loss effectively, and its size is reduced about 40% compared with the traditional filter. It makes miniaturization easy. The bandwidth is also greatly increased. The proposed filters are simulated by Ansoft Ensemble 8.0 software.

Abstract:A new method,named 'two point IRFPA nonuniformity correction method based on integration adjustment and noise equilibrium',to correct IRFPA nonuniformity in dim target detection system was presented.This method fully takes advantages of both demarcate-based and scene-based IRFPA nonuniformity correction methods.By considering dark current va-(riance) and noise characteristics of every detector cell into consideration,this method gives optimal S/N performance.Experiment results show that its performance is more perfect than that of two-point correction algorithm.

Abstract:In order to detect multi-small targets in infrared large sight field,a new method that includes "rough" phase and "precise" phase was presented here.In the "rough" phase,the rough region of small targets can be primarily obtained in large scale.Then,the small targets will be precisely detected and segmented in the "precise" phase.Experimental results show the effectiveness of our method.

Abstract:It was proposed that CO could be chosed as a target gas to detect early fires. A specific experiment system was set up based on FTIR technology. By using time series analysis, an auto-regressive models for the concentration of CO can be built. Finally, characteristic parameters of models can distinguish the real fire source from nuisance sources in short times.

Abstract:Based on the antenna directional characters in two plumb planes, the Shepard method was selected to deduce the space gain distribution of antenna of millimeter wave radiometer on bomb in Cartesian reference frame. The results of the emulational calculation of object signal show that it can supply exact and important criterions for target recognition and imaging.

Abstract:The principle of mmW passive detecting cement roads was studied. According to the antenna, surface feature and radiometer characteristic of 3-ram and 8-mm waveband, the antenna temperature contrast and the maximal detecting distance of 3-mm and 8-mm radiometers were obtained by different antenna diameters and working conditions. Also, the actual detection effect of these two models was compared.

Abstract:A novel substructure of millimeter wave equalizer was designed which was based on the analysis of the characteristic of the planar whispering-gallery modes dielectric resonator and the basis equalizing theory when it coupled with the microstrip line. The simulation shows that the quality factor and the coupling can be easily tuned by changing the parameters of the substructure. At last, a novel millimeter wave equalizer was fabricated by cascading this substructure. And it displays good performance.

Abstract:在中型烟幕试验柜中测试了红磷烟幕的红外光谱和粒度分布，分析了红磷烟幕在7．4μm～13．8μm波段的红外透过率和消光系数．测试了红磷烟幕对10．6μm激光的质量消光系数．根据Mie理论计算了红磷烟幕粒子对该波段红外的散射、吸收和消光效率因子．结果表明，在中等湿度条件下红磷烟幕对8．2μm～11．0μm红外和入射功率为1．0W的10．6μm激光的质量消光系数分别为0．424m^2／g和0．396m^2／g．红磷烟幕在成烟后10min～30min时间内粒度分布在0．5μm～3μm．平均粒度较小的红磷烟幕对中红外辐射的消光主要是吸收作用，随着烟幕粒度增加，散射作用和消光效果逐渐加强．