检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

多路法激光跟踪干涉测量系统的研究

天津大学学报（自然科学与工程技术版） 2003年第1期36卷 33-37页

作者：张国雄李杏华林永兵天津大学精密测试技术及仪器国家重点实验室天津300072

叙述了测量系统的工作原理,给出了测量一个运动物体三维坐标的计算方法,指出测量系统要进行自标定和测量,运动物体的"不同动点数"应大于9.简要分析了测量系统的组成、各自的工作原理、测量系统的误差来源与误差传递.最后通过实验验证了... 详细信息

叙述了测量系统的工作原理,给出了测量一个运动物体三维坐标的计算方法,指出测量系统要进行自标定和测量,运动物体的"不同动点数"应大于9.简要分析了测量系统的组成、各自的工作原理、测量系统的误差来源与误差传递.最后通过实验验证了测量的可行性,得出测量速度为0.5m/s,测量不确定度为0.062.m.对于提高系统精度和可靠性,提供了可能的方向和有益的建议.

关键词：多路法激光跟踪干涉测量系统三维测量柔性坐标测量系统激光干涉光路

Laser Vision Measurement System and Assessment Method for SMIC Lead Coplanarity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2000年第5期 34-39页

作者： SUN Changku QIU Yu XUE Xiaojie YE Shenghua (state key {2. of precision measuring Technology and instruments, tianjin university, tianjin 3.0072, china) Received Nov. 19, 1999 Revised manuscript received March 2., 2.00

In this paper, a successful application of line structured laser sensor, involved in SMIC chip lead coplanarity measurement, is presented. With the experimental measurement system and its corresponding mathematics model, a contact datum plane assessment of SMIC chip lead coplanarity is developed to provide method for on line measurement.

关键词： SMIC chip line structured laser coplanarity

Recognition System for Pipeline Typical Abnormal Events Based on DSP

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Recognition System for Pipeline Typical Abnormal Events Base...

Application of Dynamic Linear Detecting Method in Data Processing of the Portable Blood Sugar Analyzer

2.09 9th International Conference on Electronic Measurement & instruments（ICEMI’2.09）

作者： Jian Li Guoxing Jiang Ping Lai Shijiu Jin ( state key {2. of precision measuring Technology and instruments tianjin university No.92.Nankai District 3.0072 tianjin china)

A new technique of designing a recognition system for pipeline typical abnormal events based on DSP is introduced in this paper. The pipeline has been widely used to transport oil and gas in the world. The abnormal events such as man digging and machine digging may cause pipeline leakage or other pipeline damage, which not only causes great loss of economy, but also leads to serious pollution to the environment. The hardware and software of the system are introduced in detail. The information entropy value of abnormal events signal is calculated to identify the event’s type. The experiment proves that the system can recognize pipeline typical abnormal events effectively.

关键词： pipeline abnormal event DSP information entropy.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 80-82页

作者： Xiaohao Wang~1 Ran Liu~2.Fei Tang~1 Yangchun Yu~1 Zhaoying Zhou~1 (1.state key {2. of precision Measurement Technology and instruments,Dept.of precision instruments,Tsinghua Univ.,Beijing 100084,china) (2.Dept.of Biomedical Engineering,Tsinghua Univ.,Beijing 100084,china)

In this paper,a dynamic linear detecting method,that the non-linear coefficient NL% was led and the non-linearity of data were estimated continuously and dynamically and determined when NL% exceeded reference value (5%),was used for data processing and could solve the problem caused by the phenomenon of substrate depleting occurred following the redox reaction in portable blood sugar *** contrast to the conventional end-point method,the dynamic linear detecting method is based on multipoint data *** of measuring the calibration glucose solution with 8 various concentrations from 50 mg/dl to 400 mg/dl were carried out with the analyzer developed by our *** linear regression curve,whose correlation for the data was 0.9995 and the residual was 2.8080,were *** obtained correlation,residual, and the computation workload are all fit for the portable blood sugar analyzer.

关键词： data processing portable blood sugar analyzer dynamic linear detecting method

Temporal and spatial variations of δ^(15)N and δ^(18)O for atmospheric N_2. above the oceanic surface from Shanghai to Antarctica

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Earth Sciences 2008年第6期51卷 899-910页

作者： ZHU RenBin1, LIU YaShu1, XU Hua2. MA Jing2.& SUN LiGuang1 1 Institute of Polar Environment, university of Science and Technology of china, Hefei 2.002., china 2.state key laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 2.0091, china Institute of Polar Environment University of Science and Technology of China Hefei China state key {2. of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing China

During the 2.nd Chinese Antarctic Research Expedition (chinaRE-2.), the atmospheric gas samples above the oceanic surface and near the surface were collected on the track for the scientific ship "Xuelong" and on Millor Peninsula of eastern Antarctica, respectively, using the Tedlar gas bags. Every day the sampling times were 10:00 and 2.:00 (local time), respectively. In the laboratory, high-{2. measurement of the isotopic compositions for N2. in these gas samples was conducted using Thermo Finnigan MAT-2.3 Isotopic Mass Spectrometer with a fully automated interface for the pre-GC concen-tration (PreCon) of trace gases. The temporal and spatial variations of δ 15N and δ 18O in atmospheric N2. were analyzed. The mean δ 15N and δ 18O-N2. values above the oceanic surface were (7.2.±0.50)‰ and (44.52.0.52.‰, respectively. From 30°N to Antarctica, the δ 15N (6.05‰―7.88‰) linearly increased with the rate of about 0.01‰ with the latitude while the δ 18O (43.05‰―48.78‰) showed a large fluctua-tion. The δ 15N negatively correlated with air temperature and N2. concentration, and slightly positively correlated with δ 18O. The summertime variations of δ 15N and δ 18O-N2. appeared the same trend on Millor Peninsula of eastern Antarctica. They significantly positively correlated with each other and negatively with N2. concentration. The δ 15N and δ 18O-N2. at different sites averaged (7.42.0.35)‰ and (44.69±0.49)‰, respectively, slightly higher than those above the oceanic surface, significantly higher than those of atmospheric N2. in the low-latitude regions of Northern Hemisphere. The predominant factors affecting the spatial variations of δ 15N and δ 18O values were also discussed. The isotopic data given in this study can help to investigate the global and regional N2. budgets.

关键词： nitrous oxide Antarctica atmosphere δ^(15)N δ^(18)O isotope ocean

Research on Electric Impedance Spectroscopy of Living Cell Suspensions by a Chip with Microelectrodes

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 429-432页

作者： Xing Yang~(1,2.3) Zhaoying Zhou~(1,2.3) Mingfei Xiao~(1,2.3) Ying Wu~(1,2.3) Shangfeng Liu~4 (1.MEMS Lab.,Department of precision instruments & Mechanology,Tsinghua {2.,Beijing 100084,china) (2.Micro-Nano Technology Research Center,Tsinghua {2.,Beijing 100084,china) (3.state key laboratory of precision Measurement Technology and instruments,Tsinghua {2.,Beijing 100084,china) (4.School of Medicine,Tsinghua {2.,Beijing 100084,china)

A microfabricated electrical impedance spectroscopy (EIS) chip with microelectrodes was *** substrate and the electrodes of the chip were made of glass and gold,*** experimental results demonstrated that the EIS-chip could distinguish different solutions (physiological saline,culture medium,living cell suspension etc.) by scanning from 10Hz to 45kHz.A 6-element circuit model was used for fitting the real part and the imaginary part admittance curves of the living cell *** actual circuit was also built and tested to verify the 6-element circuit model *** micro-EIS chip has several advantages including the use of small sample volumes,high resolution and ease of *** shows good application prospects in the areas of cellular electrophysioiogy,drug screening and bio-sensors etc.

关键词： electrical impedance spectroscopy(EIS) microelectrode living cell suspension 6-element

3-D profile measurement for complex micro-structures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2005年第3期 51-54页

作者： HU Chun-guang~(**), HU Xiao-dong, XU Lin-yan, GUO Tong, and HU Xiao-tangstate key {2. of precision measuring Technology and instruments,tianjin university,tianjin 3.0072.china

Micro-structures 3-D profile measurement is an important measurement content for research on micro-machining and characterization of micro-dimension. In this paper,a new method involved 2.D structure template, which guides phase unwrapping,is proposed based on phase-shifting microscopic *** is fit not only for static measurement, but also for dynamic measurement,especially for motion of MEMS devices.3-D profile of active comb of micro-resonator is obtained by using the *** theoretic precision in out-of-plane direction is better than 0.5 *** in-plane theoretic precision in micro-structures is better than 0.5 μ*** at the edge of micro-structures,it is on the level of micrometer mainly caused by imprecise edge ***,its disadvantages and the following development are discussed.

关键词： MEMS D profile measurement for complex micro-structures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

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

一种高分辨率和高频响的光栅纳米测量细分方法

在线全文

学校读者我要写书评

暂无评论

天津大学学报（自然科学与工程技术版） 2002年第1期35卷 1-4页

作者：余文新胡小唐邹自强天津大学精密测试技术及仪器国家重点实验室天津300072 北京光电量仪研究中心北京100083

提出了一种高分辨率、高频响的光栅纳米测量细分方法——动态跟踪细分法 .它综合了计算机正切细分法细分份数大、电阻链细分法工作速度快、频响亮的优点 ,电路原理清晰、结构简单 ,能够同时适用于动态和静态测量 ,较好地解决了光栅纳米... 详细信息

提出了一种高分辨率、高频响的光栅纳米测量细分方法——动态跟踪细分法 .它综合了计算机正切细分法细分份数大、电阻链细分法工作速度快、频响亮的优点 ,电路原理清晰、结构简单 ,能够同时适用于动态和静态测量 ,较好地解决了光栅纳米测量的信号处理过程中的高速度与高分辨率、高准确度的矛盾 .实验表明 ,动态跟踪细分法能够在 40 0细分时实现10 0 k Hz以上的频率响应速度 ,配合信号周期 2.m的光栅传感器 ,可以得到 5 nm的测量分辨率 ,为光栅纳米测量技术应用于实时测量和实时控制打下了良好的基础。

关键词：光栅纳米测量莫尔条纹分辨率动态跟踪细分法频率响应信号处理