1 深圳技术大学 大数据与互联网学院,深圳 518118
2 深圳技术大学 中德智能制造学院,深圳 518118
3 深圳技术大学 新材料与新能源学院,深圳 518118
为了在被测物体部分被遮挡的情况下,仍能完整地测量出物体的表面形貌,提出了一种基于霍夫变换的多线结构光标记的光场3维成像系统。通过提取亚像素的条纹中心坐标进行投票,分析霍夫参数空间中的投票分布,设计了自适应范围投票和自适应窗口策略,无需对条纹级次编码也能够准确地确定对极平面图像中多根直线的参数。结果表明,该系统拟合平面的平均偏差为0.0096 mm,标准偏差为0.0074 mm,并利用光场成像中不同视角下物体的遮挡关系不一致,准确地恢复了被遮挡物体的完整表面形貌。这一结果对于解决3维测量过程中遮挡问题是有帮助的,该研究为获取完整和高效3维数据的测量方法提供了参考。
测量与计量 结构光场 霍夫变换 结构光 光场成像 measurement and metrology structured light field Hough transform structured light light field imaging
Author Affiliations
Abstract
1 Shenzhen Key Laboratory of Laser Engineering, Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
2 Institute of Applied Physics and Materials Engineering, University of Macau, Macau, China
Employing 0.3 nm diameter single-walled carbon nanotubes (SWCNTs) as saturable absorbers, we demonstrate a passively mode-locked fiber laser operating at 1950 nm. The 0.3 nm diameter SWCNTs are prepared by pyrolyzing dipropylamine in the channels of zeolite crystals MgAPO-11 (AEL). The laser pumped by a 1550 nm laser source produces 972 fs pulses with a spectral width at half-maximum of 4.2 nm and a repetition rate of 21.05 MHz, an average output power of 2.3 mW corresponding to the maximum pump power of 420 mW with a 10% output coupler.
140.3510 Lasers, fiber 140.4050 Mode-locked lasers 160.4236 Nanomaterials Chinese Optics Letters
2017, 15(4): 041403
