Precision Mechanical Measurements最新文献_第10页

Noise reduction of laser scanning data based on self-estimated angular threshold 基于自估计角阈值的激光扫描数据降噪

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035744

Yaofeng Wu, Wen Wang, Ke-qing Lu, Yanding Wei, Zichen Chen

{"title":"Noise reduction of laser scanning data based on self-estimated angular threshold","authors":"Yaofeng Wu, Wen Wang, Ke-qing Lu, Yanding Wei, Zichen Chen","doi":"10.1117/12.2035744","DOIUrl":"https://doi.org/10.1117/12.2035744","url":null,"abstract":"Laser scanning is widely applied to reverse engineering. Nonetheless, the involvement of scanning equipment and laser probe, as well as the measurement environment itself renders the process more vulnerable to noise which will cause failures in boundary detection, data segmentation and reconstruction of smooth curves and surfaces, thus putting forward the demand for noise reduction. Among the methods used in noise reduction of laser scanning data, the angular method is particularly suitable for scan line data. However, this method as well entails threshold that largely relies on the experience of engineers, which may introduce unwanted uncertainty. In this paper, an algorithm based on self-estimated angular threshold for reducing noise of laser scanning data is proposed. Firstly, the factors affecting angular threshold are analyzed and a mathematical model for SAT is established. Then the concrete algorithm that consists of judgment of impulse noise, modification of the coordinates and average filtering is described. Finally, a simulation test and an experimental case are employed to evaluate the performance of the algorithm on noise reduction of laser scanning data.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"59 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":"127868287","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: 4

An improving demodulation of interferometric fiber optic sensor technology 一种改进的干涉式光纤传感器解调技术

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035911

Li-Fang Gao, Yong Li, Z. Chu, Ming Wu, Nan Lin

引用次数: 0

A variable weighted centroid method for retro reflective target locating 一种变加权质心法在反射光目标定位中的应用

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035767

Wei Zhuang, M. Dong, P. Sun, Jun Wang

引用次数: 1

Bearing fault diagnosis based on scale-transformation stochastic resonance 基于尺度变换随机共振的轴承故障诊断

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035623

Y. Cui, Jun Zhao, Tiantai Guo, Yuqian Song

引用次数: 5

Error analysis and modeling for the time grating length measurement system 时栅长度测量系统误差分析与建模

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035697

Z. Gao, Jiqin Fen, F. Zheng, Ziran Chen, D. Peng, Xiaokang Liu

引用次数: 1

Dynamic high-speed acquisition system design of transmission error with USB based on LabVIEW and FPGA 基于LabVIEW和FPGA的USB传输误差动态高速采集系统设计

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035606

Yong Zheng, Yan Chen

引用次数: 1

Simulation and signal analysis of Akiyama probe applied to atomic force microscope 原子力显微镜中秋山探针的仿真与信号分析

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035726

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

引用次数: 1

3D measurement method based on combined temporal encoding structured light 基于组合时间编码结构光的三维测量方法

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035871

Xiaoyang Yu, Yang Wang, Shuang Yu, Hao Cheng, Xiaoming Sun, Shuchun Yu, Deyun Chen

引用次数: 1

Adaptive fractional differential method based on CSGV to extract image texture feature 基于CSGV的自适应分数阶微分方法提取图像纹理特征

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035859

Aiguo Song, Wei Wang

{"title":"Adaptive fractional differential method based on CSGV to extract image texture feature","authors":"Aiguo Song, Wei Wang","doi":"10.1117/12.2035859","DOIUrl":"https://doi.org/10.1117/12.2035859","url":null,"abstract":"As the sensitivity of the fractional differential algorithm for detail image texture extraction and the difficulty of the best fractional differential order fingding, a novel adaptive fractional differential method is proposed, which can adaptively select the fractional differential order according to the mask window size, definition of fractional differential equations, the composite sub-band gradient vector (CSGV) obtained from the sub-images through a wavelet decomposition of a texture image, and human visual property. The fractional differential operator mask based on G-L formula is designed and realized by employing the adaptive order. The evaluation parameters of image texture feature extraction such as the image information entropy and multi-scale structural similarity (MS-SSIM) are used for quantitative analysis of the extraction method in experiment The experiment results show that for grey texture image this method is able to extract image texture and edge details completely, which approximate the results of optimal fractional differential order and more satisfies human visual sense. It is an effective approach to extract fine texture features of images.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"56 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":"123711042","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

Measurement of transient surface temperatures during rubbing using infrared thermography 用红外热像仪测量摩擦过程中的瞬态表面温度

Precision Mechanical Measurements Pub Date : 2013-10-10 DOI: 10.1117/12.2035869

Tau You, J. Yu, Xiaofen Yu

{"title":"Measurement of transient surface temperatures during rubbing using infrared thermography","authors":"Tau You, J. Yu, Xiaofen Yu","doi":"10.1117/12.2035869","DOIUrl":"https://doi.org/10.1117/12.2035869","url":null,"abstract":"Infrared thermometer could provide IR radiance information to get the corresponding temperature as the machine is working. But the emissivity coefficient, which converts IR radiance to temperature, would vary with change of surface properties during rubbing, and this would bring dynamic error in measurement. In this study, we introduced a special tester, in the side of which compact IR thermometer are mounted. The thermometer enables us to measure contact surface temperature directly during tests of a rotating ring and a flat block which had a laser diode fixed under its contact surface. Based on Kirchhoff theory, the calculate model of the spectral emissivity is constructed. The normal emissivity at target region are measured through trigonometric ray consisted of InGaAsP laser source, PbSe detector and objective surface. So the temperature value from the IR thermometer could be corrected dynamically according to the real-time emissivity. The structure and the principle of the apparatus are described. The key technologies and the corresponding solution methods are briefly discussed. The error due to the rapid variations of emissivity value with change in contact conditions was shown, and it must be taken into consideration in radiometric temperature measurement in rubbing and could be especially useful in the verification of friction surface temperature predictions.","PeriodicalId":166465,"journal":{"name":"Precision Mechanical Measurements","volume":"11 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":"126066155","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