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Research of fiber optical Bragg grating flowmeter based on vortex occurred body 基于涡发生体的光纤光栅流量计研究
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144001.0079
仝克帅 Tong Keshuai, 薛俊华 Xue Junfei, 杨洪磊 Yang Honglei, 闫思安 Yan Si-an, 李川 Li Chuan, 李英娜 Li Yingna, 赵振刚 Zhao Zhengang, 熊新 Xiong Xin
{"title":"Research of fiber optical Bragg grating flowmeter based on vortex occurred body","authors":"仝克帅 Tong Keshuai, 薛俊华 Xue Junfei, 杨洪磊 Yang Honglei, 闫思安 Yan Si-an, 李川 Li Chuan, 李英娜 Li Yingna, 赵振刚 Zhao Zhengang, 熊新 Xiong Xin","doi":"10.3788/GXJS20144001.0079","DOIUrl":"https://doi.org/10.3788/GXJS20144001.0079","url":null,"abstract":"By combining the fiber grating sensing technique with vortex separation principle,a model of FBG vortex flow meter is researched based on triangular columnar.A pilot pressure cavity is installed in the central of triangular prism spiral bluff body,inside the cavity.Equal strength cantilever beam is set which is pasted Bragg grating.When the fluid passes through both sides of the body,alternate vortex is separated.Pulsating fluid pressure is produced inside the pilot pressure cavity.Vibration of equal strength cantilever beam is produced which vibration frequency is proportional to the frequency of vortex separation.The fluid flow is measured by detecting the vibration frequency.Experiment results show that the linearity of the flow meter is 4.38% FS,instrument coefficient is K=3.659,and the fiber Bragg grating wavelength shift frequency respond to flow rate is 1.182Hz/(m3/h).","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"79-83"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262248","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
Advances in laser speckle flowgraphy technique 激光散斑流成像技术研究进展
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144001.0021
孔. K. Ping, 杨. Y. Hui, 郑. Z. Gang, 谢银月 Xie Yin-yue, 林为民 Lin Weimin
{"title":"Advances in laser speckle flowgraphy technique","authors":"孔. K. Ping, 杨. Y. Hui, 郑. Z. Gang, 谢银月 Xie Yin-yue, 林为民 Lin Weimin","doi":"10.3788/GXJS20144001.0021","DOIUrl":"https://doi.org/10.3788/GXJS20144001.0021","url":null,"abstract":"Laser Speckle Flowgraphy(LSFG),a full field optical imaging method without scanning in biomedical field,has become a novel technique for monitoring dynamic fluctuation of blood flow owning to its outstanding features. Its validity has been demonstrated by many clinical instances in the recent twenty years.Research to date on the LSFG has led to improvements in the theory and diversity of systems.The development and the basic theory of LSFG is introduced systematically,and state-of-the-art of study on theory and system design are reviewed and illustrated by reference to recent publications.The model of velocity distribution,the algorithm of contrast analysis,the match of the size of speckle and the pixel,and the exposure time are discussed in detail.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"21-26"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262507","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
Characterization of LCD based on 1-dimension look-up table 基于一维查表的液晶显示器表征
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144001.0071
Guo Pan, Huang Qing-mei, Hu Weigui, Yang Qikai
{"title":"Characterization of LCD based on 1-dimension look-up table","authors":"Guo Pan, Huang Qing-mei, Hu Weigui, Yang Qikai","doi":"10.3788/GXJS20144001.0071","DOIUrl":"https://doi.org/10.3788/GXJS20144001.0071","url":null,"abstract":"Based on the color display principle of LCD(Liquid Crystal Display),two existing methods of characterization are compared.Since the color space of LCD is device-dependent,the characterization of LCD is carried on.The color space of LCD(RGB)to the CIE standard color space(CIE XYZ)is mapped.The data are evaluated by the color difference formula of CIELAB.The applicability of two methods(1-Dimention Look-Up Table(1D-LUT)and GOG(Gain-Offset-Gamma)Model)of characterization are analyzed.Results show that the average color difference of the tested value and the predicted value of the two characterization methods are respectively 1.56,8.87,which prove that the accuracy of 1D-LUT is higher than the accuracy of GOG Model.What’s more,the ability of color reproduction of 1D-LUT is better than the GOG Model.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"71-74"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262598","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
Dual-band projection optical system design of infrared target simulator 红外目标模拟器双频投影光学系统设计
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144002.0123
王兴龙 Wang Xinglong, 李. L. Lin, 李. L. Zhuo, 吕丽军 Lü Lijun, 陈倩祎 Chen Qianyi
{"title":"Dual-band projection optical system design of infrared target simulator","authors":"王兴龙 Wang Xinglong, 李. L. Lin, 李. L. Zhuo, 吕丽军 Lü Lijun, 陈倩祎 Chen Qianyi","doi":"10.3788/GXJS20144002.0123","DOIUrl":"https://doi.org/10.3788/GXJS20144002.0123","url":null,"abstract":"For the infrared target which is simulated by infrared target simulator more realistic,the process of dualband projection optical system of infrared target simulator is investigated and the principles of the initial structure choice are analyzed.A dual-band projection optical system of infrared target simulator is presented,which entrance pupil and full field of view are 100mm,5°respectively.There is sufficient exit pupil distance to match simulator exit pupil to the infrared imagery system entrance pupil.The system can simulate high temperature objects which wavelength at 8~12μm and normal temperature objects which wavelength at 3~5μm at the same time,it can be respectively measured by 3~5μm band infrared detector and 8~12μm band infrared detector.The image evaluation and the tolerance analysis are performed.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"123-127"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70262927","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
Experimental study on liquid refractive index sensing based on fiber-colloidal crystal 基于纤维-胶体晶体的液体折射率传感实验研究
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144002.0163
闫海涛 Yan Haitao, 张智 Zhang Zhi, 赵晓艳 Zhao Xiaoyan, 甄志强 Zhen Zhiqiang, 李立本 Li Liben
{"title":"Experimental study on liquid refractive index sensing based on fiber-colloidal crystal","authors":"闫海涛 Yan Haitao, 张智 Zhang Zhi, 赵晓艳 Zhao Xiaoyan, 甄志强 Zhen Zhiqiang, 李立本 Li Liben","doi":"10.3788/GXJS20144002.0163","DOIUrl":"https://doi.org/10.3788/GXJS20144002.0163","url":null,"abstract":"The colloidal crystals are prepared,and the changes of colloidal crystals photonic band-gap are used to study the refractive index sensing by experiment.The changes in the center wavelength of the colloidal crystals photonic band-gap are analyzed,the relationship between band-gap and refractive index is discussed in theory.The mould is designed to obtain colloidal crystals-fiber structure,colloidal crystals are observed by scan microscope and the band-gap position is measured.The results show that the measured results agree with the theoretical analysis well.The experimental device is designed to test liquid refractive index,the couple of the fibers are used to measure the band-gap of colloidal crystals and the results are also analyzed in theory.The results show that the position of a center wavelength of the silica photonic band-gap is at 1445.5nm,and the band-gap of colloidal crystals can be used to measure the liquid refractive index in different liquid.The new sensing mechanism is formed and it provides a new application of colloidal crystals in the liquid sensing.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"163-166"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70263385","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
Study on the propagation and switching performance of three-core nonlinear fiber coupler 三芯非线性光纤耦合器的传输和开关性能研究
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144003.0265
孙成 孙成, 余震虹 余震虹
{"title":"Study on the propagation and switching performance of three-core nonlinear fiber coupler","authors":"孙成 孙成, 余震虹 余震虹","doi":"10.3788/GXJS20144003.0265","DOIUrl":"https://doi.org/10.3788/GXJS20144003.0265","url":null,"abstract":"","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"265-268"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70264140","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
Simulation analysis on star image restoration of motion blur based on Wiener filtering 基于维纳滤波的运动模糊星图复原仿真分析
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0316
韩礼 Han Li, 张丽君 Zhang Lijun, 蔡洪 Cai Hong, 张士峰 Zhang Shifeng
{"title":"Simulation analysis on star image restoration of motion blur based on Wiener filtering","authors":"韩礼 Han Li, 张丽君 Zhang Lijun, 蔡洪 Cai Hong, 张士峰 Zhang Shifeng","doi":"10.3788/GXJS20144004.0316","DOIUrl":"https://doi.org/10.3788/GXJS20144004.0316","url":null,"abstract":"The star image obtained by star sensor is blurred when spacecraft makes rapid maneuver.Based on Wiener filtering,a star image restoration algorithm is proposed.The influence of blur parameters on the accuracy of star centroid estimation is analysed.The comparison data of star centroid estimation accuracy and attitude estimation accuracy of blurred star image and restored star image are obtained through extensive experiments.Simulation results show that the restored star image can significantly improve the accuracy of star centroid estimation and attitude estimation,and effectively improve the success rate of star image recognition.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"4 1","pages":"316-320"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70265093","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: 3
Earth-rock dam monitoring system based on fiber grating sensing network 基于光纤光栅传感网络的土石坝监测系统
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0357
张丰伟 Zhang Fengwei, 陈小勇 Chen Xiao-yong, 宋维彬 Song Weibin, 关袁玉 Guan Yuanyu, 李英娜 Li Yingna, 李川 Li Chuan
{"title":"Earth-rock dam monitoring system based on fiber grating sensing network","authors":"张丰伟 Zhang Fengwei, 陈小勇 Chen Xiao-yong, 宋维彬 Song Weibin, 关袁玉 Guan Yuanyu, 李英娜 Li Yingna, 李川 Li Chuan","doi":"10.3788/GXJS20144004.0357","DOIUrl":"https://doi.org/10.3788/GXJS20144004.0357","url":null,"abstract":"During the use of the earth-rock dam,it will be damaged because of the long-term effect of the load,the material aging,environmental erosion and other factors.In order to effectively monitor the earth rock dam health status and identify the structural damage,and further to predict the life of earth rock dam,it is necessary to establish the earthrock dam monitoring system.In view of the hierarchical structure of the things of internet,an earth dam monitoring system is developed.It uses a transmission technology of full optical fiber and based on Fiber Bragg Grating sensing network,which uses the FBG sensor as the detecting unit.It can collect and process the important data of the earth-rock dam,like cracks and pressure.Practical application shows that the system can show the key parameter information of the condition of the earth-rock dam and play a supporting role in the projecting of earth-rock dam reinforcement and the dam understanding of the whole situation.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"40 1","pages":"357-361"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70265238","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
Method of locating the mirror center of laser tracker target ball 激光跟踪靶球反射镜中心定位方法
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144004.0362
姜吉祥 Jiang Ji-xiang, 屈玉福 Qu Yu-fu, 邓湘金 Deng Xiangjin, 郑燕红 Zheng Yanhong
{"title":"Method of locating the mirror center of laser tracker target ball","authors":"姜吉祥 Jiang Ji-xiang, 屈玉福 Qu Yu-fu, 邓湘金 Deng Xiangjin, 郑燕红 Zheng Yanhong","doi":"10.3788/GXJS20144004.0362","DOIUrl":"https://doi.org/10.3788/GXJS20144004.0362","url":null,"abstract":"When using laser tracker to conduct global calibration of multi-sensor 3Dvision measuring system,to accurately locate the mirror center of target ball is a challenge due to the complexity of calibration field environment since the spot appearance of target ball is heavily influenced by environment light intensity,visual observation angle of measuring system and projection angle of laser.A method of locating the mirror center of laser tracker target ball is presented,which is free to illumination changes,no requirement of laser spot shape or the distribution of light intensity.First,the image segmentation algorithm is used to accurately locate the target ball area and obtain a located area.The located area is then filtered to reduce the image noise as well as enhance the visibility of the target ball and its background.After that,a mirror area of target ball is obtained by segmenting the target ball,removing strong reflective area and using morphological image processing in sequence.Finally,a mirror center position coordinates of target ball are calculated by performing the statistics of the pixel coordinates of the mirror area.Experiments on 2048×2048pixel complex spot images are carried out.Experimental results show that the correctly positioned rate is 91.2%,and the average position RMS errors is no more than 0.74pixel,which indicates that the proposed method can basically satisfy the requirements of the mirror positioning accuracy in global calibration.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"5 1","pages":"362-366"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70265247","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
Study progress on the polarization dependent gain in fiber Raman amplifiers 光纤拉曼放大器偏振相关增益的研究进展
Guangxue Jishu/Optical Technique Pub Date : 2014-01-01 DOI: 10.3788/GXJS20144005.0458
王丹燕 Wang Danyan, 姜海明 Jiang Haiming, 谢康 Xie Kang
{"title":"Study progress on the polarization dependent gain in fiber Raman amplifiers","authors":"王丹燕 Wang Danyan, 姜海明 Jiang Haiming, 谢康 Xie Kang","doi":"10.3788/GXJS20144005.0458","DOIUrl":"https://doi.org/10.3788/GXJS20144005.0458","url":null,"abstract":"The transmission performance of the optical fiber communication system is degraded by the polarization dependent gain(PDG)in fiber Raman amplifiers(FRA).The study of characteristics of the PDG in fiber Raman amplifiers and methods to reduce the PDG is very important in the optical fiber communication field.The basic principle of fiber Raman amplifiers is discussed.The analytical and experimental studies of the PDG are summarized.The ways of degrading PDG in FRA are detailed analyzed.The research tendencies of the PDG in RFA are proposed.","PeriodicalId":35591,"journal":{"name":"Guangxue Jishu/Optical Technique","volume":"34 1","pages":"458-464"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70266279","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
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