Naiting Gu
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View article: Lightweight convolutional neural network for wavefront reconstruction via a Shack-Hartmann sensor with spatial downsampled microlens
Lightweight convolutional neural network for wavefront reconstruction via a Shack-Hartmann sensor with spatial downsampled microlens Open
This study presents SIR-Net, a lightweight convolutional neural network designed to predict wavefront phase from images of a Hartmann with special downsampled microlens. The Hartmann is structured to achieve a suitable SNR when the light e…
View article: Quantitative assessment of parameter requirements in a division of focal plane polarimeter
Quantitative assessment of parameter requirements in a division of focal plane polarimeter Open
The division of focal plane polarimeter (DoFP) is a widely utilized instrument for target detection and recognition, owing to its excellent real-time performance and compact configuration. However, due to manufacturing and integration erro…
View article: High-precision calibration of the DKDP modulator for polarization measurement in solar telescopes
High-precision calibration of the DKDP modulator for polarization measurement in solar telescopes Open
DKDP modulators are widely employed in polarization measurements of solar telescopes. Accurate calibration of the DKDP modulator is essential to ensure reliable polarization measurements. In this paper, we propose a method for calibrating …
View article: Range walk error correction for MPPC array-based high-precision 3D imaging
Range walk error correction for MPPC array-based high-precision 3D imaging Open
The multi-pixel photon counter (MPPC) array-based 3D imaging is a promising technology for remote sensing. However, variations in target reflectivity can introduce range walk error (RWE) during threshold discrimination, limiting imaging pe…
View article: Embedded solar adaptive optics telescope: achieving compact integration for high-efficiency solar observations
Embedded solar adaptive optics telescope: achieving compact integration for high-efficiency solar observations Open
Adaptive optics (AO) has significantly advanced high-resolution solar observations by mitigating atmospheric turbulence. However, traditional post-focal AO systems suffer from external configurations that introduce excessive optical surfac…
View article: Infrared and visible image fusion based on multi-scale spatial attention complementary
Infrared and visible image fusion based on multi-scale spatial attention complementary Open
View article: Optimal multi-spectrum polarization detection with full-Stokes in a single channel by using standard retarders
Optimal multi-spectrum polarization detection with full-Stokes in a single channel by using standard retarders Open
View article: Ultra-Compact Solar Telescope with Wavefront Correction Ability
Ultra-Compact Solar Telescope with Wavefront Correction Ability Open
Solar telescope is the primary means of carrying out high-resolution solar observations and advanced heliophysical research, while adaptive optics has become requisite technology to address the limitations of the atmosphere turbulence in t…
View article: WITHDRAWN: Differential Lucy-Richardson-Rosen algorithm for near diffraction-limited image restoration assisting by a wavefront sensor
WITHDRAWN: Differential Lucy-Richardson-Rosen algorithm for near diffraction-limited image restoration assisting by a wavefront sensor Open
View article: Intelligent Space Thermal Control Radiator Based on Phase Change Material with Partial Visible Transparency
Intelligent Space Thermal Control Radiator Based on Phase Change Material with Partial Visible Transparency Open
Coating structures with dynamically adjustable infrared emissivity are crucial in spacecraft components to cope with the transient thermal environments of space. For a long time, thermochromic phase change materials have been widely used i…
View article: Low Spatio-Temporal Frequency Wavefront Aberration Correction Method Based on a Movable Secondary Mirror
Low Spatio-Temporal Frequency Wavefront Aberration Correction Method Based on a Movable Secondary Mirror Open
A low frequency wavefront aberration correction method for solar telescopes based on secondary mirror movement is proposed to correct dynamic wavefront aberration during the operation of solar telescope. The correction ability of this meth…
View article: Differential Lucy-Richardson-Rosen Algorithm for Near Diffraction-Limited Image Restoration Assisting by a Wavefront Sensor
Differential Lucy-Richardson-Rosen Algorithm for Near Diffraction-Limited Image Restoration Assisting by a Wavefront Sensor Open
View article: A Method of Superimposing Subapertures for Shark–Hartmann Wave Front Sensing with Faint Objects
A Method of Superimposing Subapertures for Shark–Hartmann Wave Front Sensing with Faint Objects Open
For the astronomical adaptive optics systems, the observation condition is always in a regime of low photon flux. We present a method of superimposing subapertures for the Shark–Hartmann wave front sensing with faint objects. This approach…
View article: Polarized Shack-Hartmann wavefront sensor
Polarized Shack-Hartmann wavefront sensor Open
Shack-Hartmann wavefront sensor (SHWFS) has been widely used in adaptive optics (AO) systems to detect phase distortion characteristics. In laser communication, target detection, vision optics and other application fields, the performance …
View article: High Precision and Large Dynamic Range Measurement of Laser Triangulation Displacement Sensor Using Diffraction Grating
High Precision and Large Dynamic Range Measurement of Laser Triangulation Displacement Sensor Using Diffraction Grating Open
The conventional laser triangulation displacement sensor (LTDS) is difficult to achieve large dynamic range and high precision measurement simultaneously, since LTDS is affected by factors such as limited detector size, nonlinear input and…
View article: Research on High Precision Calibration Technology of Polarizer Optical Zero Position in Polarization Imaging System
Research on High Precision Calibration Technology of Polarizer Optical Zero Position in Polarization Imaging System Open
View article: Light Bridge and Magnetic Field in a Solar Active Region
Light Bridge and Magnetic Field in a Solar Active Region Open
Observational data from the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory and the multiwavelength simultaneous imaging system attached to the New Vacuum Solar Telescope located at Fuxian Lake, China are employed …
View article: Full-Stokes Retrieving and Configuration Optimization in a Time-Integration Imaging Polarimeter
Full-Stokes Retrieving and Configuration Optimization in a Time-Integration Imaging Polarimeter Open
A time-integration imaging polarimeter with continuous rotating retarder is presented, and its full-Stokes retrieving and configuration optimization are also demonstrated. The mathematical expression between the full-Stokes vector and the …
View article: A Delay Modulation Method to Improve the Time Resolution for a 32 × 32 Array of MPPC Image Sensor
A Delay Modulation Method to Improve the Time Resolution for a 32 × 32 Array of MPPC Image Sensor Open
The array laser detector can achieve three-dimensional (3D) flash imaging via multi-channel parallel ranging, which significantly improves the imaging speed. However, the large number of the array makes it difficult to improve the ranging …
View article: Polarization imaging based on time-integration by a continuous rotating polarizer
Polarization imaging based on time-integration by a continuous rotating polarizer Open
Polarimeter by rotating polarizer is one of the well-known and classic division of time polarimeter (DoTP). It is generally acknowledged that this kind of polarimeter is time consuming for each measurement although it has simple, accurate …
View article: Modeling and experiment validation of thermal control for the heat-stop of the Chinese Large Solar Telescope
Modeling and experiment validation of thermal control for the heat-stop of the Chinese Large Solar Telescope Open
Thermal control system is one of the most important components of large ground-based solar telescope. Heat-stop is one of the key components for controlling thermal effects for a large solar telescope, which reflects over 95% of solar radi…
View article: First light of the 1.8-m solar telescope–CLST
First light of the 1.8-m solar telescope–CLST Open
View article: Numeric Study of Novel Compact Polarimeter for Full-Stokes Polarization Imaging Without Micro-Polarizer Array
Numeric Study of Novel Compact Polarimeter for Full-Stokes Polarization Imaging Without Micro-Polarizer Array Open
This paper proposed a novel polarimeter for full-Stokes polarization imaging without using any kind of micro-polarizer array. The key components of the polarimeter are two grooved birefringent crystal plates with deviate fast axis, which a…
View article: Passive control of the temperature homogeneity for the primary mirror surface of large ground-based solar telescopes
Passive control of the temperature homogeneity for the primary mirror surface of large ground-based solar telescopes Open
Mirror seeing effect and thermal deformation are two major effects brought by sunlight radiation to large ground-based solar telescopes, which compromise the imaging quality. To mitigate the effects, a thermal control system (TCS) is requi…
View article: Thermal control for light-weighted primary mirrors of large ground-based solar telescopes
Thermal control for light-weighted primary mirrors of large ground-based solar telescopes Open
A light-weighted primary mirror is the most important optical element for a large ground-based solar telescope. It receives solar radiation of more than 1000 W / m2, of which about 10% is converted into heat energy, bringing in mirror seei…
View article: Radial Shearing Interferometer
Radial Shearing Interferometer Open
Radial shearing interferometer (RSI) is one of the most powerful tools in many domains, especially in optical testing. RSI has compact size and good vibration immunity, which is adaptive to various environments, due to its common-path conf…
View article: Design and Analysis of a Novel Compact and Simultaneous Polarimeter for Complete Stokes Polarization Imaging with a Piece of Encoded Birefringent Crystal and a Micropolarizer Array
Design and Analysis of a Novel Compact and Simultaneous Polarimeter for Complete Stokes Polarization Imaging with a Piece of Encoded Birefringent Crystal and a Micropolarizer Array Open
We report a compact and simultaneous polarimeter for complete Stokes polarization imaging by using an encoded birefringent crystal (EBC), a micropolarizer array, and a camera, without any mechanical movements, electrical signal modulation,…
View article: Noncontact temperature estimation method on the actively cooled primary mirror surface of large ground-based solar telescope
Noncontact temperature estimation method on the actively cooled primary mirror surface of large ground-based solar telescope Open
To control the mirror seeing effect and the thermal deformation, the actively cooled primary mirror is utilized in a large ground-based solar telescope. Due to direct solar illumination and high reflectivity of the mirror surface coating, …
View article: A High-resolution Multi-wavelength Simultaneous Imaging System with Solar Adaptive Optics
A High-resolution Multi-wavelength Simultaneous Imaging System with Solar Adaptive Optics Open
A high-resolution multi-wavelength simultaneous imaging system from visible to near-infrared bands with a solar adaptive optics system, in which seven imaging channels, including the G band (430.5 nm), the Na i line (589 nm), the H α line …
View article: Influence of wavefront aberration on the imaging performance of the solar grating spectrometer
Influence of wavefront aberration on the imaging performance of the solar grating spectrometer Open
The solar grating spectrometer is an important tool to study the thermodynamic properties of the solar atmosphere with different height distribution, but its imaging performance will be degraded by the wavefront aberration. On the other ha…