公开(公告)号：US20220317437A1

公开(公告)日：2022-10-06

申请号：US17617318

申请日：2021-02-08

Applicant: Beijing Institute of Technology

Inventor： Qun HAO ,  Xuemin CHENG ,  Yao HU ,  Xu CHANG

IPC: G02B26/08 ,  G06N3/08

Abstract: A method for controlling a deformable mirror surface shape based on a radial primary function processes samples of a neural network training set, obtains elements of the neural network training set, characterizes the complex surface shape of the deformable mirror in each sample by using a radial primary function, takes characterization parameters of the surface shape in the each sample as an input of a neural network, and trains the neural network by taking a voltage of each piezoelectric ceramic corresponding to the complex surface shape as a corresponding output of the neural network. Training times of the neural network are consistent with a number of the samples. Finally, the trained neural network is obtained to verify the training effect of the neural network. According to the characterization parameters of the required surface, the neural network is used to control the deformable mirror to generate the required surface.

公开(公告)号：US20220252391A1

公开(公告)日：2022-08-11

申请号：US17617315

申请日：2021-02-08

Applicant: Beijing Institute of Technology

Inventor： Qun HAO ,  Yao HU ,  Zhen WANG ,  Shaopu WANG

IPC: G01B11/24 ,  G02B27/28 ,  G02B5/30

Abstract: A transient digital moire phase-shifting interferometric measuring device and method for a surface shape of an optical element solves a defect that an instantaneous vibration resistance needs to be sacrificed for a measurement range when using a two-step carrier splicing method, and expands the measurement range of a digital moire phase-shifting method while retaining instantaneous anti vibration characteristics of the digital moire phase-shifting method. The transient digital moire phase-shifting interferometric measuring device includes a light source, a beam splitter, a reference lens, a first polarization grating, a measured lens, a second polarization grating, a first imaging objective lens, a first camera, a second imaging objective lens and a second camera. Different carriers are loaded through a spectral performance of a polarization grating, and the polarization grating is used to separate two beams of an interference light, and two actual interference patterns are obtained at a same time.

公开(公告)号：US20230194724A1

公开(公告)日：2023-06-22

申请号：US17739264

申请日：2022-05-09

Applicant: Beijing Institute of Technology

Inventor： Qun HAO ,  Jie CAO ,  Jingjing LI ,  Kun LI ,  Jiaqi GUO ,  Kaili ZHANG

IPC: G01S17/894 ,  G02B26/08 ,  H01L31/107 ,  G01S7/481 ,  G01S7/484 ,  G01S7/4863

CPC classification number: G01S17/894 ,  G01S7/484 ,  G01S7/4817 ,  G01S7/4863 ,  G02B26/0833 ,  H01L31/107

Abstract: A high-dynamic-range hybrid solid-state lidar system, which is based on a transponder array module, includes a transmitting system, a transceiver integrated optical system, a one-dimensional scanning device, a detecting system, and an information processing system. An information processing control circuit and a gain control module increase a total amplification factor, in a single timing period, of a gain circuit over time, thereby alleviating an echo signal intensity distortion, and expanding a dynamic ranging range. The system uses the one-dimensional scanning device and the transceiver integrated optical system composed of a circulator, a lens set, and an optical fiber array, so that the optical system is separated from an avalanche photo diode (APD) detector, and focusing is not required. A temperature of a linear APD array is monitored in the detecting system to adjust a reverse bias voltage of an APD correspondingly and alleviate unstable gain caused by a temperature change.

公开(公告)号：US20220400203A1

公开(公告)日：2022-12-15

申请号：US17726293

申请日：2022-04-21

Applicant: Beijing Institute of Technology

Inventor： Jie CAO ,  Qun HAO ,  Huan CUI ,  Yingqiang ZHANG

IPC: H04N5/232 ,  H04N5/225 ,  G02B5/02

Abstract: Disclosed are an omnidirectional ghost imaging method and an omnidirectional ghost imaging system based on the mechanism of bio-inspired retina-like. According to the application, the logarithmic polar mapping characteristic of the bio-inspired retina-like structure is utilized to generate an annular pattern sequence of the bio-inspired retina-like, and the pattern sequence is utilized to modulate a light source. After being reflected by the target around the curved mirror, the light is projected onto the curved mirror and diffusely reflected. According to the reversible characteristics of the optical path, the light after diffuse reflection is reflected to the original light source by the half mirror and half lens, and the reflected light intensity with target information is received by the bucket detector. The reflected light intensity measurement value with target information is correlated with the annular pattern sequence of bio-inspired retina-like used for modulating the light source.

公开(公告)号：US20210255455A1

公开(公告)日：2021-08-19

申请号：US17157530

申请日：2021-01-25

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Jie CAO ,  Qun HAO ,  Guoliang LI ,  Mingyuan TANG ,  Chun BAO ,  Zixiong WU

IPC: G02B26/10 ,  A61B5/00 ,  G02B26/08

Abstract: A method for controlling hybrid scanning based on a miniature reflecting device, which includes: loading parameters for determinant scanning and circular scanning, setting a scanning start point, and performing determinant scanning; performing low-pass filtering on received sampling data to filter an outlier in a sampling process, and performing singular value determining, to determine whether there is a valid connected domain within a scanning field of view; determining, as a target of interest, a valid connected domain with a maximum quantity of singular values, and obtaining a geometric center of the target of interest by calculating an average value of driving voltages corresponding to the singular values; performing circular scanning by using the geometric center as a scanning center, determining, in a process of scanning an outermost ring, whether singular values are centrosymmetrically distributed on the ring, to fine-tune the scanning center till the singular values are centrosymmetrically distributed on the ring.