题名:  Vibration errors in phaseshifting interferometer 
作者:  WEi HaoMing; Xing TingWen

出版日期:  2009

会议名称:  Proceedings of SPIE 2009 International Conference on Optical Instruments and Technology  Optoelectronic Measurement Technology and Systems

会议日期:  2009

通讯作者:  WEi HaoMing

中文摘要:  Unexpected mechanical vibrations can significantly degrade the otherwise high accuracy of phaseshifting interferometer (PSI). Because the data acquisition takes place over time, sensitivity to vibration is as a function of the frequency, the phase, the amplitude of vibrations, the smoothness of test surface and the slope coefficient of reference plane. A complete, nonlinear, continuing mathematical model of PSI with well defined longitudinal and transverse vibrations is presented. The approach to quantifying vibration is using the discrete sum formula instead of the continuing integral model. Computer simulations are performed over a range of vibration frequencies and amplitudes for 4,7,11 and 15 frames phaseshift algorithms. Numerical simulation results demonstrate the methods to increase the accuracy of PSI is to choose more phase steps and higher speed CCD camera and PSI with small slope coefficient of reference surface and good smooth test surface has low sensitivity to transverse vibration. Finally programs basing on the phaseshifting interference theory are given to imitate the process of obtaining interferogram with vibrations. After intensity signal is processed through PSI algorithm and phase unwrapping algorithm, the sensitivity of PSI to vibration is achieved and described by the difference of the computer phase and test phase. The results of numerical simulation are supported by several examples on dummy experimental platform. 
英文摘要:  Unexpected mechanical vibrations can significantly degrade the otherwise high accuracy of phaseshifting interferometer (PSI). Because the data acquisition takes place over time, sensitivity to vibration is as a function of the frequency, the phase, the amplitude of vibrations, the smoothness of test surface and the slope coefficient of reference plane. A complete, nonlinear, continuing mathematical model of PSI with well defined longitudinal and transverse vibrations is presented. The approach to quantifying vibration is using the discrete sum formula instead of the continuing integral model. Computer simulations are performed over a range of vibration frequencies and amplitudes for 4,7,11 and 15 frames phaseshift algorithms. Numerical simulation results demonstrate the methods to increase the accuracy of PSI is to choose more phase steps and higher speed CCD camera and PSI with small slope coefficient of reference surface and good smooth test surface has low sensitivity to transverse vibration. Finally programs basing on the phaseshifting interference theory are given to imitate the process of obtaining interferogram with vibrations. After intensity signal is processed through PSI algorithm and phase unwrapping algorithm, the sensitivity of PSI to vibration is achieved and described by the difference of the computer phase and test phase. The results of numerical simulation are supported by several examples on dummy experimental platform. 
收录类别:  Ei

语种:  英语

卷号:  7511

文章类型:  会议论文

内容类型:  会议论文

URI标识:  http://ir.ioe.ac.cn/handle/181551/7444

Appears in Collections:  应用光学研究室（二室）_会议论文

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Recommended Citation: 
WEi HaoMing,Xing TingWen. Vibration errors in phaseshifting interferometer[C]. 见:Proceedings of SPIE 2009 International Conference on Optical Instruments and Technology  Optoelectronic Measurement Technology and Systems. 2009.


