Precision Mechanical Measurements最新文献

Evaluation of measurement uncertainty based on Bayesian information fusion 基于贝叶斯信息融合的测量不确定度评定

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035725

Shan-Tair Wang, Xiaohuai Chen, Qiao Yang

引用次数: 1

Mine rescue capsule dynamics modeling and stress analysis 矿山救援舱动力学建模与应力分析

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035879

Shuyi Yang, Jingjing Li, Yaobing Sun

引用次数: 0

Experimental research on anti-vibration interferometry based on time-frequency-domain analysis 基于时频域分析的抗振干涉测量实验研究

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035878

Yao Hu, Q. Hao, Fanghua Zhang, Y. Tian

引用次数: 1

Dual AFM probes alignment based on vision guidance 基于视觉引导的双AFM探针对准

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035775

Hua-kun Zhang, S. Gao, Ming-zhen Lu, Longlong Wang

{"title":"Dual AFM probes alignment based on vision guidance","authors":"Hua-kun Zhang, S. Gao, Ming-zhen Lu, Longlong Wang","doi":"10.1117/12.2035775","DOIUrl":"https://doi.org/10.1117/12.2035775","url":null,"abstract":"Atomic force microscope (AFM) with dual probes that operate together can measure both side walls excellently at the same time, which virtually eliminates the prevalent effect of probe width that contributes a large component of uncertainty in measurement results and finally obtains the critical dimension (CD)(e.g. the linewidth) through data synthesis. In calibration process, the dual probes must contact each other in advance, which realizes the alignment in the three dimensions, to establish a zero reference point and ensure the accuracy of measurement. Because nowadays the optical resolution of advanced lens have exceeded micrometer range, and the size of probes is within micro level, it is possible to acquire dual probes images in both horizontal and vertical directions, through which the movement of the probes can be controlled in time. In order to further enhance the alignment precision, sub-pixel edge detection method based on Zernike orthogonal moment is used to obtain relative position between these two probes, which helps the tips alignment attains sub-micron range. Piezoelectric nanopositioning stages calibrated by laser interferometer are used to implement fine movement of the probes to verify the accuracy of the experimental results. To simplify the system, novel self-sensing and self-actuating probe based on a quartz tuning fork combined with a micromachined cantilever is used for dynamic mode AFM. In this case, an external optical detection system is not needed, so the system is simple and small.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125278530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An improved centroid location algorithm for Infrared LED feature points 一种改进的红外LED特征点质心定位算法

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035814

Shaoqiong Wang, B. Yan, M. Dong, Jun Wang, P. Sun

引用次数: 5

Phase modulation dynamic AFM measurement system based on tuning fork probe 基于音叉探头的相位调制动态AFM测量系统

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035750

T. Guo, Weijia Chen, Zhichao Wu, Jinping Chen, Xing Fu, Xiaotang Hu

引用次数: 0

Measurement uncertainty analysis on laser tracker combined with articulated CMM 激光跟踪仪与关节式三坐标测量机的测量不确定度分析

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2036484

Huining Zhao, Liandong Yu, Yun Du, Hai-yan Zhang

引用次数: 0

All-fiber Q-switched ytterbium-doped fiber laser in MOPA configurations MOPA结构全光纤调q掺镱光纤激光器

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035827

W. He, Lianqing Zhu, Yinmin Zhang, M. Dong, Xiaohuai Chen

{"title":"All-fiber Q-switched ytterbium-doped fiber laser in MOPA configurations","authors":"W. He, Lianqing Zhu, Yinmin Zhang, M. Dong, Xiaohuai Chen","doi":"10.1117/12.2035827","DOIUrl":"https://doi.org/10.1117/12.2035827","url":null,"abstract":"An all fiber Q-switched Ytterbium-Doped Fiber （YDF） laser in Master Oscillator Power-Amplifier (MOPA) configuration is proposed theoretically and demonstrated experimentally, and the principle analysis and experimental verification are presented in details. Firstly, the system configuration is designed. The system is composed of the seed and the amplifier stage. Two 915nm LDs are used for pumping light, and the light is coupled into the gain medium of the seed and the amplifier stage by two combiners, respectively. Two Fiber Bragg Gratings (FBGs) are used as ends of the cavity of the seed. One Q-switch is used to modulate output laser of the seed, and the amplifier stage is adopted to amplify the light behind the seed. Then, 10m YDF with single mode is selected for the gain medium of the seed, and 8m YDF with multimode is used as the gain medium of the amplifier stage. The output laser of the seed with a 1.02W average power is realized when the seed pump power is 5.74W, the repetition rate is 20KHz and the action time of the Q-switch is 3.5μs. Meanwhile, a 7.58W pump power of the amplifier stage is used to amplify the seed laser. Finally, output laser with the pulse width of 90ns and the average output power of 4.93W are achieved.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126813610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of dual wavelength micro pulse polarization lidar system 双波长微脉冲偏振激光雷达系统设计

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035637

Yuehui Song, Dengxin Hua, Shichun Li, Yufeng Wang, W. Xin, Huige Di

引用次数: 0

Harmonic distortion analysis of a Mach-Zehnder intensity modulator 马赫-曾德尔强度调制器的谐波畸变分析

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035920

Xiaoqing Zhang, Shuling Hu, Yudong Jia, Zhehai Zhou, Lei Liao

{"title":"Harmonic distortion analysis of a Mach-Zehnder intensity modulator","authors":"Xiaoqing Zhang, Shuling Hu, Yudong Jia, Zhehai Zhou, Lei Liao","doi":"10.1117/12.2035920","DOIUrl":"https://doi.org/10.1117/12.2035920","url":null,"abstract":"With the aim to get harmonic distortion characteristics and frequency components of modulated output signals of a Mach-Zehnder (MZ) intensity modulator, this paper analyzes the optical intensity modulation transfer function by Tailor expandsion method according with the working principle of modulator. From the viewpoint of spectrum, the output signal is mainly comprised of the fundamental harmonic, the second intermodulation harmonic and the third intermodulation harmonic of the input signal and their magnitudes are connected with the bias voltage and Eigen-phase of MZ modulator. The second harmonic distortion and the fundamental harmonic of the modulated output signal are closely related with the drift of the best bias point. When the modulator works at the best DC bias voltage point, the modulated output signals have the minimum second harmonic distortion. If the best bias point drifts, the second harmonic distortion increases and the fundamental harmonic decreases, which changes in proportion to the sine or cosine of the drift voltage. A 1GHz sine signal with 1V amplitude imposed on the modulator, the simulation results by MATLAB presents that the waveform starts distorting along with the drifting of the best bias voltage, which the fundamental wave component starts decreasing and the second harmonic component starts increasing. While at last the fundamental wave component is zero, the frequency of output modulated signal doubles as much the frequency of input signal.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114849440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2