The higher accuracy of measuring the Doppler frequencies, the less error of the aperture distribution.
多普勒频率的测频精度愈高，反演口径分布的误差愈小。
2
Rotating aperture cone shearing white-light speckle photography for measuring dynamic derivatives of displacements is proposed in this paper.
利用旋转孔径技术和锥镜剪切技术进行白光散斑剪切照相，检测动态位移导数场。
3
Two methods and devices which are changeable aperture and movable aperture for measuring the mode-field radius of single-mode optical fibers are presented.