In recent years, modern optical processing technologies, such as single point diamond turning, ion beam etching, and magneto-theological finishing, arc getting break- throughs. Machining precisions of super-smooth opt...In recent years, modern optical processing technologies, such as single point diamond turning, ion beam etching, and magneto-theological finishing, arc getting break- throughs. Machining precisions of super-smooth optics have also been significantly improved. However, with increasing demands for the optical surface quality,展开更多
The characteristics of magnetorheological fin- ishing (MRF) technique such as the behavior of magnetic particles and the magnetic field distribution have been inves- tigated. Based on the established theoretical model...The characteristics of magnetorheological fin- ishing (MRF) technique such as the behavior of magnetic particles and the magnetic field distribution have been inves- tigated. Based on the established theoretical model, material removal function and removal rate experiments involving a K9 glass mirror are designed and carried out. Further experiments are carried out to improve the surface roughness of the workpiece. The final surface roughness with an initial value of 17.58 nm reached 0.4351 nm rms after 35 min of deterministic MRF, and the AFM measurements on microstructures of the polished surface are also improved by 0.445 nm rms without obvious defects.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61627825 and 11275172)the State Key Laboratory of Modern Optical Instrumentation Innovation Program(MOI)(No.MOI2015 B06)
文摘In recent years, modern optical processing technologies, such as single point diamond turning, ion beam etching, and magneto-theological finishing, arc getting break- throughs. Machining precisions of super-smooth optics have also been significantly improved. However, with increasing demands for the optical surface quality,
基金This work was supported by the National Natural Science Foundation of China(Grant No.50175062).
文摘The characteristics of magnetorheological fin- ishing (MRF) technique such as the behavior of magnetic particles and the magnetic field distribution have been inves- tigated. Based on the established theoretical model, material removal function and removal rate experiments involving a K9 glass mirror are designed and carried out. Further experiments are carried out to improve the surface roughness of the workpiece. The final surface roughness with an initial value of 17.58 nm reached 0.4351 nm rms after 35 min of deterministic MRF, and the AFM measurements on microstructures of the polished surface are also improved by 0.445 nm rms without obvious defects.
文摘针对因图像采集系统或采集环境本身的限制导致的立体图像模糊、质量低下、感兴趣区域不显著等问题,在最新的基于立体注意力模块的立体图像超分辨算法的基础上,通过在单图超分辨(Single Image Super-Resolution,SISR)的深度网络中引入立体图像左右两个视点间的互补信息以及平滑损失(Smoothness Loss)函数,增强超分辨后立体图像的视觉效果。在该算法中,梯度更小、更加平滑的立体注意力图可以获得更好的立体图像超分辨效果。为证明引入的函数有效,对改进前后的基于立体注意力机制的立体图像超分辨算法进行对比实验和分析,结果表明,引入平滑损失后,SRCNN和SRResNet模型的峰值信噪比(Peak Signal to Noise Ratio,PSNR)值和结构相似性(Structural Similarity,SSIM)值有明显提高。
