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Study on the Performance of the nonlinear Joint Transform Correlator

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Chinese Journal of Lasers 1997年第2期B6卷 122-130页

作者： QIN Yuwen GE BaozhenCHEN Ximing zhang yimol JIAN Shuisheng(institute of Lightwave Technology,Northern Jiaotong University, Beijing 100044)(institute of optoelectronic and precision engineering , Tianjin University, Tianjin 300072 China) Northern Jiaotong Univ Beijing China

We present the nonlinear joint transform correlation computer simulation results and the optical experimental results of the scale and rotation varying objects, as well as the statistical experimental results of the autocorrelation peak distribution of the object. The given experimental results show clearly that the optical experimental system is a nonlinear joint transform correlation system and the distribution of the autocorrelation peak is to some extent random. Correlation peak signal intensity of the nonlinear joint transform correlation system has no obvious variation when the scale variation of the object is less than 10% or the rotation angle variation of the object is less than 5 degrees.

关键词： optical pattern recognition real-time joint transform correlation nonlinear joint transform correlation

The Detection of Defects in Optical Fibers Using a Hybrid Opto-electronic Correlator

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Chinese Journal of Lasers 2000年第3期9卷 15-21页

作者： LIU Yange LIU Wei zhang yimo ZHOU Ge (College of precision Instrument and Opto-electronics engineering, Tianjin University Opto-electronic Information Science and Technology Lab., Tianjin 300072, China) 天津大学光电信息技术科学开放实验室天津

A hybrid opto-electronic correlator for detecting defects i n optical fibers is proposed. After the light from a He-Ne laser being expanded and filtered it is not collimated but directly passes a Fourier transform lens and illuminates a reference fiber and a test fiber at the same input plane. The Fourier transform spectrum of the two fibers is therefore obtained at the rear focal plane of the lens, where it is sampled via a CCD array connected with a computer through a frame grabber. The computer performs filter, inverse Fourier transform and setting threshold operation on classification. The system is an equivalent of joint transform correlator with a Fourier lens of long focal length. The experiment results for optical fibers having incoordinate defects are presented. The results indicate that the system can be used for fiber defect detection, and has the advantages of high identification, compact configuration, easy adjustment and flexible manipulation.

关键词： joint transform correlation Fourier transform optical fiber defect detection

SURFACE ROUGHNESS PREDICTION MODEL FOR ULTRAprecision TURNING ALUMINIUM ALLOY WITH A SINGLE CRYSTAL DIAMOND TOOL

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Chinese Journal of Mechanical engineering 2002年第2期15卷 153-156,176页

作者： Wang Hongxiang Li Dan Dong shen precision engineering Research institute, Harbin institute of Technology, Harbin 150001, China precision engineering Research institute Harbin Institute of Technology Harbin 150001China ***

A surface roughness model utilizing regression analysis method is developedfor predicting roughness of ultra-precision machined surface with a single crystal diamond tool. Theeffects of the main variables, such as cutting speed, feed, and depth of cut on surface roughnessare also analyzed in diamond turning aluminum alloy. In order to predict the optimum cuttingconditions during process planning. A lot of experimental results show that the model can predictthe surface roughness effectively under a certain cutting conditions.

关键词： Surface roughness Regression analysis Diamond turning Diamond tool

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Comparison Study of Two Mehods for Realizing Real-time High-efficiency JTC

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Chinese Journal of Lasers 1995年第5期B4卷 455-462页

作者： GE Baozhen QIN Yuwen zhang yimo HUANG Zhanhua zhang Hong (institute of Contemporary Optical Instruments engineering,Tianjin University, Tianjin 300072, China) Tianjin Univ Tianjin China

ＣｏｍｐａｒｉｓｏｎＳｔｕｄｙｏｆＴｗｏＭｅｈｏｄｓｆｏｒＲｅａｌｉｚｉｎｇＲｅａｌ－ｔｉｍｅＨｉｇｈ－ｅｆｆｉｃｉｅｎｃｙＪＴＣＧＥＢａｏｚｈｅｎ；ＱＩＮＹｕｗｅｎ；ＺＨＡＮＧＹｉｍｏ；ＨＵＡＮＧＺｈａｎｈｕａ；Ｚ... 详细信息

ＣｏｍｐａｒｉｓｏｎＳｔｕｄｙｏｆＴｗｏＭｅｈｏｄｓｆｏｒＲｅａｌｉｚｉｎｇＲｅａｌ－ｔｉｍｅＨｉｇｈ－ｅｆｆｉｃｉｅｎｃｙＪＴＣＧＥＢａｏｚｈｅｎ；ＱＩＮＹｕｗｅｎ；ＺＨＡＮＧＹｉｍｏ；ＨＵＡＮＧＺｈａｎｈｕａ；ＺＨＡＮＧＨｏｎｇ（Ｉｎｓｔｉｔｕｔ...

关键词： optical pattern recognition optical self-adaptation hybrid optical correlator

Diffusion Bonding between TiAl Based Alloys and Steels

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Journal of Materials Science & Technology 2001年第1期17卷 191-192页

作者： Wenbo HAN and Jiuhai zhang National Key Laboratory of precision Hot Processing of Metals, School of Materials Science and engineering, Harbin institute of Technology, Harbin 150001, China Harbin Inst Technol Sch Mat Sci & Engn Natl Key Lab Precis Hot Proc Met Harbin 150001 Peoples R China

The joint of 40Cr steel and TiAl based alloy has been studied by means of a high frequency induction diffusion welder. The experimental results show that, the higher the temperature and pressure, the higher the streng... 详细信息

关键词： temperature and pressure optimum parameters TiAl based alloy high frequency strength of

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Multi-channel　Associative　Memory　Using　Liquid　Crystal　Photoelectric　Switches

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Chinese Journal of Lasers 1995年第6期B4卷 495-500页

作者： LI Heqiao LIU Wei zhang yimo(institute of Opto-electronics and precision engineering, Tianjin University,Tianjin 300072, China)Received 9 May 1995 Revised manuscript received 30 July 1995 Supported by National 863 High Technology Project. Tianjin Univ Tianjin China

Ｍｕｌｔｉ－ｃｈａｎｎｅｌＡｓｓｏｃｉａｔｉｖｅＭｅｍｏｒｙＵｓｉｎｇＬｉｑｕｉｄＣｒｙｓｔａｌＰｈｏｔｏｅｌｅｃｔｒｉｃＳｗｉｔｃｈｅｓ￥ＬＩＨｅｑｉａｏ；ＬＩＵＷｅｉ；ＺＨＡＮＧＹｉｍｏ（ＩｎｓｔｉｔｕｔｅｏｆＯ... 详细信息

Ｍｕｌｔｉ－ｃｈａｎｎｅｌＡｓｓｏｃｉａｔｉｖｅＭｅｍｏｒｙＵｓｉｎｇＬｉｑｕｉｄＣｒｙｓｔａｌＰｈｏｔｏｅｌｅｃｔｒｉｃＳｗｉｔｃｈｅｓ￥ＬＩＨｅｑｉａｏ；ＬＩＵＷｅｉ；ＺＨＡＮＧＹｉｍｏ（ＩｎｓｔｉｔｕｔｅｏｆＯｐｔｏ－ｅｌｅｃｔｒｏｎｉｃｓａｎ...

关键词： associative memory liquid crystal photoelectric switch four-channel parallelprocessing

Design and Implementation of a Virtual Multi-channel Optical Ring

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Chinese Journal of Lasers 2001年第6期10卷 12-17页

作者： JING Wencai ZHOU Ge zhang yimo LI Haifeng zhang Hongxia (College of precision Instrument & Opto-electronics engineering, Tianjin University, Key Laboratory of optoelectronics Information Technical Science, EMC, Tianjin 300072, China) 天津大学精密仪器与光电子工程学院教育部光电信息技术科学重点实验室天津 300072

The hardware and the communication protocol of a scalable optical ring have been designed. A hardware routing has been achieved on the network interface card to minimize data packet communication latency and a simplified communication protocol has been designed to reduce communication overheads. To reduce the data packet blocking probability and have a more efficient usage of the data link layer bandwidth, a virtual multi-channel transmission mechanism has been achieved. The network supports a maximum of 16 virtual channels for each physical data link. Time slots can be dynamically assigned to each virtual channel. Zero wait time has been achieved for the switching between different virtual channels.

关键词： communication protocol scalable optical ring hardware routing virtual multi-channel transmission time slot