摘要
提出了正弦脉宽调制和相位编码结合的一种三维形貌测量方法。这种方法离焦投影编码的两种条纹到被测对象上,使用相移算法,由正弦脉冲宽度调制条纹得到截断相位,由相位编码条纹解码得到条纹级次,从而恢复测量对象的三维形貌。实验结果证明了该方法有两个优点:(1)轻度离焦滤除了谐波从而能降低测量误差;(2)基于相位的编码方式能测量表面反射率不一物体。
A 3D shape measurement method combining sinusoidal pulse width modulation fringe with phase coding fringe was proposed. Two kinds of coding fringes were projected onto the object with defocus. Using a phase-shift algorithm, the wrapped phase was obtained by the sinusoidal pulse width modulation fringe, the fringe order was got by the phase coding fringe. Then, the three-dimensional shape of the measurement object can be restored. The experimental results demonstrate that the proposed method has two merits： （1） It can decrease the measurement error because of filtering the harmonics with slight defocus; （2） It can measure the different contrast object because it is based on phase code.
出处
《红外与激光工程》
EI
CSCD
北大核心
2016年第6期171-176,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(51365045,61462063)
航空科学基金(2013ZE56013)
上海航天科技创新基金(SAST2015046)
关键词
三维测量
离焦
正弦脉冲宽度调制条纹
相位编码条纹
3D shape measurement
defocusing
sinusoidal pulse width modulation fringe
phase coding fringe
