International Symposium on Laser Metrology最新文献_第7页

Laser spectroscopic study of acetate-capped colloidal ZnO nanoparticles 醋酸盐包封胶体ZnO纳米粒子的激光光谱研究

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814571

S. Oh, X. W. Sim, S. Tripathy

引用次数: 1

Full-field swept-source optical coherence tomography with Gaussian spectral shaping 高斯光谱整形的全场扫描源光学相干层析成像

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814551

S. Dubey, G. Sheoran, T. Anna, A. Anand, D. Mehta, C. Shakher

引用次数: 4

Faster window Fourier transform filters for fringe pattern analysis 更快的窗口傅里叶变换滤波器条纹图案分析

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814529

Le Tran Hoai Nam, K. Qian

引用次数: 2

Model building and measurement of the temporal noise for thermal infrared imager 热红外成像仪时域噪声的建模与测量

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814548

Xun Yu, Liang Nie, Tieli Hu, Xu Jiang, F. Wang

{"title":"Model building and measurement of the temporal noise for thermal infrared imager","authors":"Xun Yu, Liang Nie, Tieli Hu, Xu Jiang, F. Wang","doi":"10.1117/12.814548","DOIUrl":"https://doi.org/10.1117/12.814548","url":null,"abstract":"In the measurement of the infrared imager, noise is the primary parameter in evaluating the quality of the infrared imager. In the engineering application of the infrared imager, three-dimensional noise pattern is not applied widely in the hard technology of the infrared imager due to its pattern is complex, physical significance is not definite and visualized. Noise parameters include the temporal noise and the spatial noise. The temporal noise can be divided into high frequency temporal noise and low frequency temporal noise (namely 1/f noise), and the spatial noise can be divided into high frequency spatial noise (namely fixed pattern noise, FPN) and low frequency spatial noise (un-uniform noise). The strict definition about high frequency temporal noise and low frequency temporal noise is given in this paper. The algorithm and measuring methods for low frequency temporal noise equivalent temperature difference are proposed. The algorithms and measuring methods of high frequency noise equivalent temperature difference are given, ignoring low frequency temporal noise in short-time during measuring high frequency noise equivalent temperature difference or not. Moreover, the uncertainty of measurement results for high frequency temporal noise equivalent temperature difference is analyzed in the paper.","PeriodicalId":191475,"journal":{"name":"International Symposium on Laser Metrology","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132034133","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

Measurement of temperature field in steady laminar free convection flow using digital holography 用数字全息技术测量稳定层流自由对流中的温度场

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814570

C. Shakher, Md. Mosarraf Hossain, D. Mehta, G. Sheoran

引用次数: 6

Development of an inexpensive optical method for studies of dental erosion process in vitro 一种廉价的体外牙蚀过程研究光学方法的发展

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814561

A. M. F. Nasution, B. Noerjanto, L. Triwanto

{"title":"Development of an inexpensive optical method for studies of dental erosion process in vitro","authors":"A. M. F. Nasution, B. Noerjanto, L. Triwanto","doi":"10.1117/12.814561","DOIUrl":"https://doi.org/10.1117/12.814561","url":null,"abstract":"Teeth have important roles in digestion of food, supporting the facial-structure, as well as in articulation of speech. Abnormality in teeth structure can be initiated by an erosion process due to diet or beverages consumption that lead to destruction which affect their functionality. Research to study the erosion processes that lead to teeth's abnormality is important in order to be used as a care and prevention purpose. Accurate measurement methods would be necessary as a research tool, in order to be capable for quantifying dental destruction's degree. In this work an inexpensive optical method as tool to study dental erosion process is developed. It is based on extraction the parameters from the 3D dental visual information. The 3D visual image is obtained from reconstruction of multiple lateral projection of 2D images that captured from many angles. Using a simple motor stepper and a pocket digital camera, sequence of multi-projection 2D images of premolar tooth is obtained. This images are then reconstructed to produce a 3D image, which is useful for quantifying related dental erosion parameters. The quantification process is obtained from the shrinkage of dental volume as well as surface properties due to erosion process. Results of quantification is correlated to the ones of dissolved calcium atom which released from the tooth using atomic absorption spectrometry. This proposed method would be useful as visualization tool in many engineering, dentistry, and medical research. It would be useful also for the educational purposes.","PeriodicalId":191475,"journal":{"name":"International Symposium on Laser Metrology","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128323505","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

The output characteristics of the erbium-doped fiber Bragg grating ring laser 掺铒光纤布拉格光栅环形激光器的输出特性

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814572

C. Yang, C. Ko, K. Huang, M. Shih

引用次数: 0

Model-free and model-based methods for dimensional metrology during the lifetime of a product 在产品的生命周期内，无模型和基于模型的尺寸计量方法

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814534

P. Weidner, A. Kasic, T. Hingst, Carsten Ehlers, S. Philipp, T. Marschner, M. Moert

引用次数: 3

Inspection of thin films failure: optical shearography versus electrochemical impedance spectroscopy 薄膜失效的检测:光学剪切与电化学阻抗谱

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814622

K. Habib, F. Al-Sabti

{"title":"Inspection of thin films failure: optical shearography versus electrochemical impedance spectroscopy","authors":"K. Habib, F. Al-Sabti","doi":"10.1117/12.814622","DOIUrl":"https://doi.org/10.1117/12.814622","url":null,"abstract":"In the present work, the temperature versus thermal deformation (strain) with respect to time, of different coating films were studied by a non-destructive technique (NDT) known as shearography. An organic coating, i.e., ACE Premium Enamel, on a metallic alloy, i.e., a carbon steel, was investigated at a temperature range simulating the severe weather temperatures in Kuwait especially between the daylight and the night time temperatures, 20-60 °C. The investigation focused on determining the in-plane displacement of the coating, which amounts to the thermal deformation (strain) with respect to the applied temperature range. Furthermore, the investigation focused on determining the thermal expansion coefficients of coatings, the slope of the plot of the thermal deformation (strain) versus the applied temperature range. In other words, one could determine, from the decreasing value of the thermal expansion coefficients of coatings, a critical (steady state) value of the thermal expansion coefficients of coatings, in which the integrity of the coatings can be assessed with respect to time. In fact, determination of critical (steady state) value of the thermal expansion coefficients of coatings could be accomplished independent of parameters, i.e., UV exposure, humidity, exposure to chemical species, and so on, normally are considered in conventional methods of the assessment of the integrity of coatings. In other words, with the technique of shearography, one would need only to determine the critical (steady state) value of the thermal expansion coefficients of coatings, regardless of the history of the coating, in order to assess the integrity of coatings. Furthermore, results of shearography indicate that the technique is very useful NDT method not only for determining the critical value of the thermal expansion coefficients of different coatings, but also the technique can be used as a 2D- microscope for monitoring the deformation of the coatings in real-time at a submicroscopic scale.","PeriodicalId":191475,"journal":{"name":"International Symposium on Laser Metrology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115242150","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

Research of the conical cavity high-energy laser energy meter energy loss compensation technique 锥形腔高能激光能量计能量损失补偿技术的研究

International Symposium on Laser Metrology Pub Date : 2008-09-29 DOI: 10.1117/12.814601

Xun Yu, Qian Li, Liang Nie, Xiao-yan Shang, B. Liu

{"title":"Research of the conical cavity high-energy laser energy meter energy loss compensation technique","authors":"Xun Yu, Qian Li, Liang Nie, Xiao-yan Shang, B. Liu","doi":"10.1117/12.814601","DOIUrl":"https://doi.org/10.1117/12.814601","url":null,"abstract":"Because absolute quantity thermal laser energy meter based on conical cavity has some features, for example, wavelength adaptation range is wide and laser damage threshold value is high. It is used for the standard of the high-energy laser energy meter and extensively in the domain of the high energy laser measurement. However, laser energy will lose because of the heat exchange and the back scattering of the conical absorption cavity. Therefore, only after compensating and amending the loss, the exact measurement of the laser energy can be achieved. Aimed to the energy loss compensation problem of the conical cavity high-energy laser energy meter, firstly, according to the heat transfer theory, this paper analyzes the heat energy loss of the conical cavity due to the heat emission, the heat convection and the heat exchange, and construct the mathematical model of the heat energy loss, based on which measuring result is curved fit using the least squares technique, and is compensated and amended utilizing the fitting curve, whose measurement repetitiveness is 0.7%, from which we can know that measuring repetitiveness is increased consumedly. Secondly, according to the optics principles of reciprocity of the conical cavity inner face and the incident laser and utilizing complexification Simpson numerical method, the mathematical model of conical cavity jaw opening optical power density distribution and back scattering gross power is established, based on which measuring result is compensated and amended, the back scattering energy loss is about 0.5% to 2.5%, high-energy laser energy measuring accuracy is improved availably.","PeriodicalId":191475,"journal":{"name":"International Symposium on Laser Metrology","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122702953","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