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8th International Symposium on Precision Engineering Measurements and Instrumentation

作者： Jia, Yudong Zhang, Xiaoqing Lv, Yong Lang, Xiaoping School of Instrument Science and Opto-electronics Engineering Beijing Information Science and Technology University Beijing 100192 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China

ISBN: (纸本)9780819495501

According to the gridded discrete processing method, the laser echo characteristics in the case of ladder terrain ground are analyzed theoretically, and the ladder-like terrain echo mathematical model are established. We find from the work that these two peaks of ladder terrain echo curve is the reflecting of ladder and ground respectively, the time interval between wave peaks is determined by the mutations height of terrain. The mutations height is higher, pulse shaping is more obvious, it is also shown that ground reflectivity in the laser spot affects the size of the echo peak mainly, and does not affect the peak location on the curve. © 2013 SPIE.

关键词： Ladders

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Micro-hole fabrication based on focus-shaped radially polarized beams

Micro-hole fabrication based on focus-shaped radially polari...

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8th International Symposium on Precision Engineering Measurements and Instrumentation

作者： Du, Furong Zhou, Zhehai Zhang, Xiaoqing Zhu, Lianqing Beijing Engineering Research Center of Optoelectronic Information and Instruments Beijing Information Science and Technology University Beijing 100192 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China

ISBN: (纸本)9780819495501

A micro-hole fabrication scheme based on focus-shaped radially polarized beams is presented. First, a micro-hole fabrication system is demonstrated based on the focus shaping of radially polarized beams, where a high energy ultra-small spot with a long depth of focus can be obtained by focus shaping using the combination of a diffractive optical element (DOE) and a high numerical-aperture objective, and such focused spot is preferred to fabricate the micro-hole with a high ratio of depth and radius. Then, diffractive optical elements (DOEs) are designed to achieve such ultra-small spots with a long depth of focus using the global search algorithm, and the focus-shaped field intensities are calculated based on vector diffraction theory. Finally, a conclusion is drawn from the theoretical analysis and numerical simulation, and focus-shaped radially polarized beams are suitable to fabricate the micro-hole with a high ratio of depth and radius. © 2013 SPIE.

关键词： Diffractive optical elements

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Design of temperature control system for blackbody radiation source based on TEC

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2013年第6 SUPPL.期34卷 197-201页

作者： Li, Fei Lv, Yong Liu, Lishuang Lang, Xiaoping Beijing Information Science and Technology University Beijing 100192 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China

In order to ensure the stability of temperature of the blackbody radiation source, a high-performance, high-precision temperature control system is designed. This system is based on the thermo-electric cooler (TEC) which is controlled by ADN8830 automatically. The temperature of the blackbody radiation source is sensed by the Pt100 thermistor, and then the temperature signal is converted into the voltage signal by the temperature transmitter to ADN8830. The PID closed feedback loop is adopted for the temperature controlling. Through the test of the designed temperature control system, the result shows that the set-up time of this system is about 340 s and the temperature control accuracy is ±0.02°C.

关键词： Temperature control

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Design of weak optical signal detection circuit

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2013年第6 SUPPL.期34卷 306-310页

作者： Wang, Hao Lv, Yong Liu, Lishuang Lang, Xiaoping Beijing Information Science and Technology University Beijing 100192 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China

The design based on avalanche photo diode (APD) is described in this paper to provide a extract the weak signal from the noise. The amplifying circuit based on negative feedback current input can realize high sensitivity, low noise amplifying, and the OPA657 chip is selected as the pre-amplifier. MAX280 active low-pass filter is used to suppress high frequency noise effectively and the output signal to noise ratio (SNR) is improved by 5 times. The theory analysis and the experiment results show that the minimum detection power of the circuit is about 7.9 nW to the light of 980 nm.

关键词： Signal to noise ratio

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Generation of cylindrical vector beams with a cat-eye cavity laser and a Mach-Zehnder interferometric arrangement

Generation of cylindrical vector beams with a cat-eye cavity...

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8th International Symposium on Precision Engineering Measurements and Instrumentation

作者： Xiao, Baoling Hu, Zhaohui Zhou, Zhehai Zhang, Shulian Yang, Jie Wang, Xiaoling Zhu, Lianqing Beijing Engineering Research Center of Optoelectronic Information and Instruments Beijing Information Science and Technology University Beijing 100192 China Science and Technology on Inertial Laboratory School of Instrumentation Science and Optoelectronic Engineering Beihang University Beijing 100191 China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing 100084 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China

ISBN: (纸本)9780819495501

A novel method to generate cylindrical vector beams is presented based on a cat-eye cavity laser and a Mach-Zehnder interferometric arrangement. Some transverse modes can be generated by the cat-eye cavity laser and then superimposed by the Mach-Zehnder interferometric arrangement to form different kinds of cylindrical vector beams. First, simulations of four kinds of cylindrical vector beams based on four kinds of combinations of transverse modes are made and other situations are also discussed when the two beams are in-phase, 180° out-of-phase and with other phase difference. Then, an experimental set-up based on a cat-eye cavity laser and a Mach-Zehnder interferometric arrangement is built, and four forms of cylindrical vector beams generated by the experiment system. The experimental results agree well with the simulative results. © 2013 SPIE.

关键词： Vectors

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Detecting and adapting to drifting concepts

Detecting and adapting to drifting concepts

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2012 9th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2012

作者： Chen, Haixia Ma, Shengxian Jiang, Kai Science and Technology on Electro-optical Information Security Control Laboratory Beijing China 45th Research Institute of CETC Beijing China

ISBN: (纸本)9781467300223

The importance of incremental learning in changing environments has been acknowledged in recent years. In this paper we present an ensemble learning method for supervised learning with drifting concepts. The method employs hypothesis test as mechanism for detecting concept drift and learns a base classifier for each new training data chunk. Former classifiers deemed as usable by the hypothesis test mechanism and the new classifiers are integrated to form the final classifiers ensemble for prediction. The main focus of the work is to identify the usability of base classifiers that representing the same or similar concept with the current one, make full use of the older valid information together with the newer examples to improve classification accuracy, and avoid the interference of classifiers representing conflictive concepts with the current one. Experiments with simulated concept drift scenarios compared the proposed method with other approaches. The results showed that the method could consistently recognize different types of drift, adapt quickly to these changes to maintain its performance level, and utilize the former knowledge to improve its performance for recurring context. © 2012 IEEE.

关键词： Classification (of information)

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Classification of incomplete data using classifier ensembles

Classification of incomplete data using classifier ensembles

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2012 International Conference on Systems and Informatics, ICSAI 2012

作者： Chen, Haixia Du, Yuping Jiang, Kai Science and Technology on Electro-optical Information Security Control Laboratory Beijing China 45th Research Institute CETC Beijing China

ISBN: (纸本)9781467301992

This paper proposes a method for classification of incomplete data using neural network ensembles. In the method, the incomplete data set is analyzed and projected into a group of complete data subsets that give a full description of the known values in the data set by joining together. Those complete data subsets are then used as the training sets for the neural networks. Base classifiers are selected and integrated according to their classification accuracies and the support degrees of their training data sets to give the final predication. Compared with other methods dealing with missing data in classification, the proposed method can utilize all the information provided by the incomplete data, maintain maximum consistency of the incomplete data set and avoid the dependency on distribution or model assumptions. Experiments on two UCI datasets showed the superiority of the algorithm to other two typical treatments of missing data in ensemble learning. © 2012 IEEE.

关键词： Classification (of information)

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Design of weak optical signal detection circuit

Design of weak optical signal detection circuit

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第四届国际自动化测试与仪器仪表学术会议

作者： Wang Hao Lv Yong Liu Lishuang Lang Xiaoping Beijing Information Science & Technology University Science and Technology on Electro-Optical Information Security Control Laboratory

The design based on avalanche photo diode(APD)is described in this paper to provide a extract the weak signal from the *** amplifying circuit based on negative feedback current input can realize high sensitivity,low noise amplifying,and the OPA657 chip is selected as the ***280 active low-pass filter is used to suppress high frequency noise effectively and the output signal to noise ratio(SNR) is improved by 5 *** theory analysis and the experiment results show that the minimum detection power of the circuit is about 1.9nW to the light of980nm.

关键词： weak optical detection pre-amplifier filter avalanche photo diode(APD)

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Design of temperature control system for blackbody radiation source based on TEC

Design of temperature control system for blackbody radiation...

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第四届国际自动化测试与仪器仪表学术会议

作者： Li Fei Lv Yong Liu Lishuang Lang Xiaoping Beijing Information Science and Technology University Science and Technology on Electro-Optical Information Security Control Laboratory

In order to ensure the stability of temperature of the blackbody radiation source,a high-performance,high-precision temperature control system is *** system is based on the thermo-electric cooler(TEC) which is controlled by ADN8830 *** temperature of the blackbody radiation source is sensed by the Pt100 thermistor,and then the temperature signal is converted into the voltage signal by the temperature transmitter to *** PID closed feedback loop is adopted for the temperature *** the test of the designed temperature control system,the result shows that the set-up time of this system is about 340 s and the temperature control accuracy is ±0.02 ℃.

关键词： PID ADN8830 thermo-electric cooler(TEC)

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Non-negative matrix factorization based on double sparsity K-SVD

Non-negative matrix factorization based on double sparsity K...

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第三届数字制造与自动化国际会议

作者： Zheng Hong Li Zhen Li Zhao School of Automation Science and Electrical Engineering Beihang University Science and Technology on Electro-Optical Information Security Control Laboratory

This paper presents a novel non-negative matrix factorization algorithm based on double sparsity K-SVD. It keeps the good parts-based representation. And meanwhile it has a well sparsity as sparse coding. The influences given by different initialization condition have been successfully overcome. Compared with other algorithms, the algorithm proposed is much faster. This dissertation demonstrates the advantages of the proposed algorithm by simulator experimentation.

关键词： double sparisity K-SVD non-negative matrix factorization

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