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三角法光学非接触测量头应用中的关键技术

天津大学学报（自然科学与工程技术版） 2005年第1期38卷 69-73页

作者：吴奎先杨仁平张国雄李敬杰裘祖荣于复生冷长林中国工程物理研究院化工材料研究所绵阳621900 天津大学精密测试技术及仪器国家重点实验室天津300072

光学非接触测头在其实际应用中,有一系列问题需要解决.为此,对三角法测量头的灵敏度与特性标定、工件的倾斜与颜色的影响、光束功率与引起的温升、测头的位置找正、测头系统的作用半径标定等应用中的关键技术进行了实验研究,提出了误差... 详细信息

光学非接触测头在其实际应用中,有一系列问题需要解决.为此,对三角法测量头的灵敏度与特性标定、工件的倾斜与颜色的影响、光束功率与引起的温升、测头的位置找正、测头系统的作用半径标定等应用中的关键技术进行了实验研究,提出了误差补偿、提高调整和标定精度以提高光学非接触测头使用精度的方法.

关键词：测量非接触测头三角法标定作用半径

Study on Calibration Methods of Structured Light Sensor

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Chinese Journal of Lasers 2002年第3期11卷 39-45页

作者： WANG Baoguang HE Zhonghai LIAO Yibai CHEN Lincai (state key {2. of precision measuring technology and instruments, tianjin university, tianjin 300072, china) tianjin university State Key Laboratory of Precision Measuring Technology and Instruments 天津 300072

In this paper, advantages and disadvantages of existing calibration methods are presented. Based on the projective transformation which is the basic principle of a CCD camera, a new method of calibrating structured li... 详细信息

关键词： structured light sensor projective transformation calibration

New Laser Interferometer with OPD Multiplication for Nanometer Measurement

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Chinese Journal of Lasers 1999年第5期8卷 3-5页

作者： ZHAO Meirong QU Xinghua WANG Hailong LU Boyin(state key {2. of precision measuring technology and instruments,tianjin university, tianjin 300072, china) 天津大学精密测试技术及仪器国家重点实验室天津

By using coupled differential interferometry a new laser displacement measurement interferometer with nanometric accuracy has been developed The resolution and the stability of the interferometer are improved by multiplicating the optical path difference (OPD). The new interferometer is simple in concept, symmetric in optical paths, without optical deadpath, easy to set up and align. λ/1600 resolution and nanometric accuracy are achieved within the measurement range of 10mm.

关键词： nanometer nanometroolgy laser interferometer displacement measurement differential interfrometry OPD multiplication

The Optical Characteristics of the Acousto-optic Tunable Filter with the Equivalent Point

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Chinese Journal of Lasers 2002年第2期11卷 55-60页

作者： XU Kexin NI Yong XUE Bin JIANG Chengzhi HU Xiaotang( state key {2. of precision measuring technology and instruments, tianjin university, tianjin 300072, china) tianjin university State Key Laboratory of Precision Measuring Technology and Instruments 天津 300072

In this paper, the interaction curves of acoustic and optical waves in a non-collinear AOTF (acousto-optic tunable filter) cell under the parallel-tangent momentum matching condition are analyzed systematically. A new theory of equivalent point for AOTF design is put forward. The wavelength characteristics and the wavelength resolution of two diffraction beams with equivalent point design in AOTF are emphatically analyzed. The optical characteristics at δ = 0 (ideal case) and δ≠0 (real case) are also discussed. The advantages of the AOTF with equivalent point design include high wavelength resolution, more quantitative energy and larger incident angle aperture.

关键词： equivalent point momentum matching AOTF TeO2

Optic Fiber Interferometer for Absolute Distance Measurement

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Chinese Journal of Lasers 1997年第5期B6卷 435-440页

作者： WANG Zhong HONG Haitao XIAO Hai SUN Changku MENG Yan YE Shenghua (state key {2. of precision measuring technology and instruments,tianjin university, tianjin 300072, china) tianjin Univ Tianjin China

A synthesized scheme is presented to solve the ambiguity problems in ab-solute distance measurement, the principle and the structure of the system is introduced. The digital signal process for fast positioning is discussed in detail. Meanwhile, an expansion method is put forward to expand the dynamic range of the optic fiber interferometry system. Some experimental results are given.

关键词： absolute distance measurement optic fiber interferometer digital signal process

STUDY ON A PRECISE ON-SPOT CALIBRATION METHOD FOR DISTRIBUTED STEREO REFERENCE POSITION-SETTING

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Chinese Journal of Mechanical Engineering 2002年第4期15卷 324-327页

作者： Wang Zhong Kou Xinyu Chen Mingzhou Ye Shenghuastate key {2. of precision measuring technology and instruments, tianjin university,tianjin 300072, chinaXiong Chunbaotianjin {12. tianjin university State Key Laboratory of Precision Measuring Technology and Instruments 天津 300072

A high precision method used for on-spot calibration of distributed stereoreference position setting is presented. The high measuring accuracy in stereo reference calibrationis derived from using a high precision water level instrument and an accurate height verniercaliper. It settles the problem of reference calibration effectively and accurately, without usinglarge coordinate measuring machines (CMM). It is more adaptable and precise than traditionalcalibration methods applying theodolites or autocollimators. The error sources of this method areanalyzed in detail and several methods are developed to eliminate the calibration *** swallowtail-like anchor target is developed. Experiments show that the calibrationaccuracy can be limited within 0.06 mm in the range of 3～5 m and 0.03 mm with optimizing anchortarget. This method can be widely used in on-spot calibration.

关键词： position setting reference calibration water level on-spot inspection error analysis

A Rapid Calibration Technique for Scanning Line-Structured Laser Sensor

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光学学报 2003年第S1期23卷 839-840页

作者： Li Tao, Changku Sun, ZhiqinXu, Wei Wei state key {2. of precision measuring technology and instruments, tianjin university, tianjin 300072, china state key {2. of precision measuring technology and instruments Tianjin University Tianjin 300072 China

A novel procedure to calibrate the scanning line-structured laser sensor is presented. A drone composed of two orthogonal planes is designed, with the result that camera parameters and light-plane equation parameters ... 详细信息

关键词： for in of on be as line A Rapid Calibration Technique for Scanning Line-Structured Laser Sensor

Clustering behavior of solid particles in two-dimensional liquid-solid fluidized-beds

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Particuology 2007年第5期5卷 305-311页

作者： Xiaodong Ana, Mingyan Liua,b,, Yunguan Fua a School of Chemical Engineering and technology, tianjin university,{2., china b state key laboratory of Chemical Engineering, tianjin university,{2., china [a]School of Chemical Engineering and technology tianjin university tianjin 300072 china [b]state {2. laboratory of Chemical Engineering tianjin university tianjin 300072 china

In this paper, the clustering behavior of solid particles in a two-dimensional (2.) liquid-solid fluidized-bed was studied by using the charge coupled devices (CCD) imaging measuring and processing technique and was characterized by fractal analysis. CCD images show that the distribution of solid particles in the 2. liquid-solid fluidised-bed is not uniform and self-organization behavior of solid particles was observed under the present experimental conditions. The solid particles move up in the 2. fluidized-bed in groups or clusters whose configurations are often in the form of horizontal strands. The box fractal dimension of the cluster images in the 2. liquid-solid fluidized-bed increases with the rising of solid holdup and reduces with the increment of solid particle diameter and superficial liquid velocity. At given solid holdup and solid particle size, the lighter particles show smaller fractal dimensions.

关键词： CCD Liquid–solid ?uidized-bed Fractal dimension Cluster Self-organization structure

Integrated modeling of nitrogen oxides formation in diesel engines

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Progress in Natural Science:Materials International 2007年第12期17卷 1476-1481页

作者： Song Jinou, Yao Chunde and Wang Hongfu(state key {2. of Engine, tianjin university, tianjin 300072, china) state key {2. of Engine Tianjin University Tianjin 300072 China

To account for the effects of both chemistry and flow turbulence, the present study proposes an integrated NO sub-model that combines the extended Zel’dovich mechanism and engine CFD computations to simulate the NO histories in a diesel engine. NOx sub-model parameters and pollutant formation mechanisms can be more easily investigated by solving the NOx sub-model. The new NO formation model incorporating the effects of both chemical kinetics and turbulent mixing was applied to simulate a diesel engine with a quiescent combustion chamber, and one with a re-entrant combustion chamber; the premise of the model being the reaction rate is mainly determined by a kinetic timescale and a turbulent timescale. The results indicate that the predicted NO formulation from the new model agrees well with the measured data. As the utilization of fossil fuels continues to increase, the control of NOx emissions is a worldwide concern; and it is imperative to understand fully the NOx reaction processes in combustion systems. This technology has the potential to enhance the application of various combustion techniques used to reduce NOx emissions from practical combustion systems.

关键词： nitrogen oxides (NOx) combustion turbulence diesel.