角振幅的图像测量方法

将时间平均成像方法用于谐波角振动物体的振幅测量。采用该方法只需用普通的CCD摄像机分别摄取被测物体的静态下在图像及其在谐波振动状态下的一幅时间平均成像,即可求得该物体的角振幅。为求解该问题所导出的非线性方程,本文构造了基于图像相关的迭代算法。实验表明该测量方法具有较高的精度和工程可用性,且对实验设备和测量环境要求不高,很适合现场测量。

Measurement of Angular Vibration Amplitude by Time Average Imaging

A new image processing method is presented to determine the angular vibration amplitude of a rigid body in rotational harmonic oscillation from its two images. These images are captured with a CCD camera, the first image is recorded when the object as in static state and the second image is a time average image recorded when the body as in angular vibration. An iterative algorithm based upon digital image correlation also presented to solve the derived nonlinear equations. Experimental results showed that the method can be used to determine angular amplitudes of harmonic vibrations with reasonable accuracy. Besides, this method has trivial requests for picturing equipment and experiment environment and is especially suitable for field measurement.