-
公开(公告)号：US11709111B2
公开(公告)日：2023-07-25
申请号：US17292982
申请日：2020-07-17
申请人： Zhejiang University
发明人： Jian Bai , Lei Zhao , Binjie Lu , Xiao Huang , Xiangdong Zhou , Jing Hou
IPC分类号： G01M11/02 , G01B9/02055 , G01J9/02
CPC分类号： G01M11/0271 , G01B9/02078 , G01J9/02
摘要： The disclosure provides a device for detecting a wavefront error by modal-based optimization phase retrieval using an extended Nijboer-Zernike (ENZ) theory. The detection device includes a point light source (1), a half mirror (2), a lens (3) to be tested, a plane mirror (4) and an image sensor (5). The wavefront error of the component under test is characterized by using a Zernike polynomial, and a Zernike polynomial coefficient is solved based on an ENZ diffraction theory. The present disclosure realizes the one-time full-aperture measurement on the wavefront error of a large-aperture optical component, and can use a partially overexposed image to achieve accurate wavefront error retrieval. Meanwhile, the present disclosure overcomes the contradiction between underexposure and high signal-to-noise ratio (SNR) caused by a limited dynamic range when the image sensor (5) acquires an image. The detection device is simple and does not have high requirements for the experimental environment.
-
2.发明授权公开(公告)号：US12037907B2
公开(公告)日：2024-07-16
申请号：US17658280
申请日：2022-04-07
发明人： Xiaowei Ye , Zhixiong Liu , Siyuan Ma , Junchao Li , Yunmin Chen , Jing Hou , Weijiang Chu , Can Wang
CPC分类号： E21D9/003 , E21D9/0635 , E21D9/0879 , G01N3/068 , G01N3/12 , G01V3/17 , G01N2203/0075 , G01N2203/0246 , G01N2203/0647
摘要： A hypergravity model test device for simulating a progressive failure of a shield tunnel face, including a model box, a shield tunnel model, a servo loading control system and a data acquisition system. The servo loading control system includes a servo motor, a planetary roller screw electric cylinder and a loading rod. The data acquisition system includes a displacement transducer, an axial force meter, a pore pressure transducer, an earth pressure transducer and an industrial camera. The servo loading control system is connected to an excavation plate through the loading rod to control the excavation plate to move back and forth along an axial direction of the shield tunnel model at a set speed to simulate failure of the shield tunnel face. A method for simulating a progressive failure of a shield tunnel face is also provided.
-
公开(公告)号：US11846558B2
公开(公告)日：2023-12-19
申请号：US17284861
申请日：2020-07-20
申请人： Zhejiang University
发明人： Jian Bai , Lei Zhao , Binjie Lu , Xiangdong Zhou , Jing Hou
CPC分类号： G01M11/0207 , G02B5/205 , G02B27/126
摘要： The present disclosure provides an apparatus and method for wavefront reconstruction based on rotationally symmetric extended structured light illumination. The apparatus includes a laser device, a neutral density filter, a microscope objective, a pinhole, a collimating lens, a beam splitter prism, a spatial light modulator, a lens to be measured, and an image acquisition device that are sequentially arranged. The method permits modulation of incident parallel light into phase grating-like structured light by using a spatial light modulator. Based on the characteristic of non-infinitely small pixel unit of the spatial light modulator, changing the modulation pattern of the spatial light modulator may result in different forms of structured light. Not only the object to be measured but also the real structured light wavefront can be recovered by acquiring diffraction spots at the focal plane and simultaneously updating the object plane and the structured light plane using an algorithm.
-
公开(公告)号：US20220187160A1
公开(公告)日：2022-06-16
申请号：US17284861
申请日：2020-07-20
申请人： Zhejiang University
发明人： Jian Bai , Lei Zhao , Binjie Lu , Xiangdong Zhou , Jing Hou
摘要： The present disclosure provides an apparatus and method for wavefront reconstruction based on rotationally symmetric extended structured light illumination. The apparatus includes a laser device, a neutral density filter, a microscope objective, a pinhole, a collimating lens, a beam splitter prism, a spatial light modulator, a lens to be measured, and an image acquisition device that are sequentially arranged. The method permits modulation of incident parallel light into phase grating-like structured light by using a spatial light modulator. Based on the characteristic of non-infinitely small pixel unit of the spatial light modulator, changing the modulation pattern of the spatial light modulator may result in different forms of structured light. Not only the object to be measured but also the real structured light wavefront can be recovered by acquiring diffraction spots at the focal plane and simultaneously updating the object plane and the structured light plane using an algorithm
-
-
-
搜索结果
4 条记录 (耗时 0.012 秒)
