数字成像时间平均全息振动分析

A Vibration Analysis by Digital Imaging Time-Average Holography

提出用时间平均数字全息与数字成像相结合的技术测量物体的振幅场,在时间平均数字全息光路中引入成像透镜,使时间平均数字全息技术适用于大尺寸物体的振动分析。阐述了该技术的基本理论,设计了测量光路,并用圆形压电陶瓷片作了实验验证。实验结果表明,在相同条件下,使用数字成像时间平均全息技术记录和再现的数字全息干涉图与使用传统的时间平均全息干涉计量技术记录和再现的全息干涉图相吻合,比较两者的振幅计算结果误差很小。

Technique of combining time- average digital holography with digital imaging to measure the amplitude field of object is proposed, the imaging lens is introduced into the optical system of time- average digital holography, and the vibration of large objects can be analyzed by time- average digital holographic technique. The basic theory of this technique is described, the related optical system is designed, and the results are verified by experiments with the help of a round piezoelectric ceramic piece.These experiments show that the digital holographic interferogram recorded and reconstructed by digital imaging time- average holographic technique agree well with that recorded and reconstructed by traditional time- average holographic interferometry under identical condition. Error of amplitudes of both obtained by calculating through comparisons is very small.