CAJ | 학술논문

提出一种基于动态投影栅线的全场非接触测量振动或者连续变形物体的位移、速度和加速度的方法.利用高速摄像机采集一系列随时间变化的投影栅线图.加窗傅里叶变换由于可进行局部分析和更好地抑制噪声,被用来提取单幅栅线图的相位.经过对序列投影栅线图在空间域上的处理,得到包含位移信息的三维复相位矩阵.再通过加窗傅里叶脊对位移在时间域上的分析,进一步提取出物体的速度和加速度分布.连续振动悬臂梁的测量实验结果表明,动态投影栅线结合加窗傅里叶分析能够得到动态变形物体上每个点的瞬时的位移、速度和加速度分布,证实了该方法的有效性.
제출일충기우동태투영책선적전장비접촉측량진동혹자련속변형물체적위이、속도화가속도적방법.이용고속섭상궤채집일계렬수시간변화적투영책선도.가창부리협변환유우가진행국부분석화경호지억제조성,피용래제취단폭책선도적상위.경과대서렬투영책선도재공간역상적처리,득도포함위이신식적삼유복상위구진.재통과가창부리협척대위이재시간역상적분석,진일보제취출물체적속도화가속도분포.련속진동현비량적측량실험결과표명,동태투영책선결합가창부리협분석능구득도동태변형물체상매개점적순시적위이、속도화가속도분포,증실료해방법적유효성.
A non-contact whole-field method for displacement,velocity and acceleration measurements of a vibrating or continuous deformed object is presented based on dynamic fringe projection.A sequence of fringe patterns changing with time are captured by a high-speed camera.The phase changes of the object at different instants are obtained by 2D windowed Fourier transform because it performs over a local area and can effectively suppress noise.3D complex matrix related to displacement can be obtained after spatial processing of the time-sequence fringe patterns.The velocity and acceleration can be extracted by temporal windowed Fourier ridge analysis of the displacement.The experiment for measurement of a vibrating cantilever beam is conducted to verify the efficiency of the method.The results show that the dynamic fringe projection with widowed Fourier analysis can be used to evaluate the displacement,velocity and acceleration on each point of dynamic deformed object.