Vibration Analysis by Phase Shifting Digital Holography
Vibration Analysis by Phase Shifting Digital Holography
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DOI：
10.1007/s10043-004-0297-7
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发表时间：
2004-10
期刊：
影响因子：
1.2
通讯作者：
Fucai Zhang;J. Valera;I. Yamaguchi;M. Yokota;Godfrey A Mills
中科院分区：
文献类型：
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作者：
Fucai Zhang;J. Valera;I. Yamaguchi;M. Yokota;Godfrey A Mills
相移数字全息术已被用于振动物体的研究。采用三步相移法计算了物体振动产生的菲涅耳衍射场的时均复振幅。对复振幅进行逆菲涅耳变换，得到叠加有贝塞尔条纹的物体图像。贝塞尔条纹是振幅的等值线图。通过在振动频率下正弦调制参考光束的相位，可以将最亮的条纹移动到感兴趣的点，从而扩展振动幅度的可测量范围。
Phase-shifting digital holography has been used for the study of vibrating objects. The time-averaged complex amplitude of Fresnel diffracted field due to a vibrating object was obtained by using a three-step phase-shifting algorithm. Taking the inverse Fresnel transform of the complex amplitude resulted in an image of the object superimposed with Bessel fringes. The Bessel fringes are contour map of the vibration amplitude. By sinusoidally modulating the phase of the reference beam at the vibration frequency, the brightest fringe could be shifted to points of interest, thus extending the measurable range of vibration amplitude.