A5034247762- Adaptive optics and wavefront sensing
- Optical Systems and Laser Technology
- Advanced optical system design
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Optical measurement and interference techniques
- Non-Destructive Testing Techniques
- CRISPR and Genetic Engineering
- Astronomical Observations and Instrumentation
- Welding Techniques and Residual Stresses
- Advanced Measurement and Metrology Techniques
- Surface Roughness and Optical Measurements
- RNA and protein synthesis mechanisms
- Optical Coatings and Gratings
- Chromosomal and Genetic Variations
- Infrared Target Detection Methodologies
- Optical Coherence Tomography Applications
- TiO2 Photocatalysis and Solar Cells
- Enhanced Oil Recovery Techniques
- Laser Material Processing Techniques
- Gamma-ray bursts and supernovae
- Fault Detection and Control Systems
- Optical Wireless Communication Technologies
- Advanced Photocatalysis Techniques
- Electrophoretic Deposition in Materials Science
China University of Petroleum, Beijing
2025
Nanjing Institute of Astronomical Optics & Technology
2006-2024
Chinese Academy of Sciences
2008-2024
Northwestern Polytechnical University
2024
University of New Mexico
2023-2024
National Astronomical Observatories
2006-2023
Center for Excellence in Molecular Cell Science
2022-2023
University of Chinese Academy of Sciences
2010-2023
Xiamen University
2022
Academia Sinica
2022
Phase \RNum{2} of the LAMOST-{\sl Kepler/K}2 survey (LK-MRS), initiated in 2018, aims at collecting medium-resolution spectra ($R\sim7,500$; hereafter MRS) for more than $50,000$ stars with multiple visits ($\sim60$ epochs) over a period 5 years (2018 September to 2023 June). We selected 20 footprints distributed across {\sl Kepler} field and six K}2 campaigns, each plate containing number ranging from $\sim2,000$ $\sim 3,000$. During first year observations, LK-MRS has already collected...
Real-time wavefront correction is a challenging problem to present for conventional adaptive optics systems. Here, we an all-optical system realize real-time correction. Using deep learning, the system, which contains only multiple transmissive diffractive layers, trained high-quality imaging unknown, random, distorted wavefronts. Once physically fabricated, this passive optical positioned between lens and image plane all-optically correct new wavefronts whose errors are within training...
Research on adaptive deformable mirror technology for voice coil actuators is an important trend in the development of large ground-based telescopes. A contains a number actuators, and there are problems with structural coupling temperature increases their internal coils. Additionally, parameters traditional proportional integral derivative control cannot be adjusted real-time to adapt system changes. These can addressed by introducing fuzzy methods. table lookup method adopted replace...
In this paper, we present a deep learning framework with attention mechanism for visibility prediction. We firstly formulate prediction as temporal problem. An encoder-decoder architecture based network is proposed to generate multi-step To adaptively focus on different parts of the input and output sequence, incorporate into network. Experiments verify feasibility model. produce state-of-the-art accuracy (68.9%) runway visual range in our customized data set collected at observation...
A woofer-tweeter deformable mirror (DM) driven by combined actuators with a piezoelectric unimorph and stack for astronomical applications is proposed. The "tweeter" part, made of 200-μm-thick lead zirconate titanate film silicon, has 234 separate elements high-order correction. It magnetically jointed seven-element "woofer" piezo-stack array, which low-order DM was fabricated experimentally evaluated, showing high resonant frequency near 1 kHz. array together the enable to produce...
The large adaptive deformable mirrors were adapted in several aperture telescopes and has been proved to have great effect the AO system, however captive sensors used secondary are very sensitive circumstance such as temperature, moisture, dust, So a new mirror scheme using Eddy Current Sensors proposed this paper. technical plan would be discussed paper, number of simulations carried out some experiments result posed
This paper aims to conduct a comprehensive theoretical analysis of current diffusion models. We introduce novel generative learning methodology utilizing the Schr{\"o}dinger bridge model in latent space as framework for exploration this domain. Our approach commences with pre-training an encoder-decoder architecture using data originating from distribution that may diverge target distribution, thus facilitating accommodation large sample size through utilization pre-existing large-scale...
Abstract Concentrated solar power (CSP) plants need to monitor the surface slope error of thousands heliostats with sub-milliradian accuracy. Large numbers installed in harsh environments mean that measurement speed and durability are key design considerations for metrology systems. We present a compact, accurate, high-speed heliostat system is robust environmental conditions at CSP plants. The composed (1) grating embedded mirrors (GEMs), which have multiple different phase diffraction...
Deep nonparametric regression, characterized by the utilization of deep neural networks to learn target functions, has emerged as a focal point research attention in recent years. Despite considerable progress understanding convergence rates, absence asymptotic properties hinders rigorous statistical inference. To address this gap, we propose novel framework that transforms estimation paradigm into platform conducive conditional mean estimation, leveraging diffusion model. Theoretically,...
Our article "Optical system for extremely large spectroscopic survey telescope" has been accepted on December 26, 2023, published online March 7, 2024, and will be in July 2024 Vol. 67 No. 7: 279511 Sci. China-Phys. Mech. Astron. In this article, a pure reflecting optical with novel strip lensm (lens-prism) atmospheric dispersion corrector (S-ADC) is used, breaking through the glass material size limit of lens corrector, making possibility to have an aperture 16 meters field view 2.5 degrees...
Shack–Hartmann wavefront sensors (SHWFSs) are crucial for detecting distortions in adaptive optics systems, but the accuracy of reconstruction is often hampered by low guide star brightness or strong atmospheric turbulence. This study introduces a new method using Vision Transformer model to process image information from SHWFSs. Compared with previous traditional methods, this can assign weight value each subaperture considering position and sensor, it obtain results. Comparative...
Co-phase and co-focus detection is one of the key technologies for large-aperture segmented mirror telescopes. In this paper, a new edge sensor based on fringes equal thickness developed, which can detect each segment's relative piston, tilt, tip errors from interferograms. Based demand many ground-based seeing limited telescopes, an prototype such principle built applied in indoor experiment system lab. According to requirement Large Sky Area Multi-Object Fiber Spectroscopic Telescope,...
Abstract The surface accuracy of a large radio telescope’s primary reflector is easily affected by gravity and temperature change during observations. An active system crucial to ensure the regular operation high-quality data output telescope. We propose real-time closed-loop including two components. first component, new type photoelectric edge sensor, detects angle adjacent panels. second displacement actuator, adjusts panels’ position posture compensate for changes. So, over entire...
The Large Area Multi-Object Spectroscopic Telescope (LAMOST) is a meridian reflecting Schmidt telescope with 40m optical axis between the plate and spherical primary mirror. In middle located focal plane, through which there are corresponding 4000+ unit mounting holes for fibers, on its back, attached support truss adapted from Serrurier concept. mechanical stabilization of plane system naturally has magnificent impact observation efficiency LAMOST. A comprehensive Finite Element Model been...
The thickness of the thin shell used in large aperture adaptive mirrors is usually less than 2mm, contrast shell's diameter could be larger several hundred millimeters, so that stiffness low enough to adapt high frequency deformation. However very easily out shape during process when pads were glued onto mirror, some analysis based on experiment would presented this paper, and force introduced by glue extracted method, result polishing eliminate influence bonding
Large adaptive deformable mirror is becoming a trend for ground base telescope, at present almost all the large mirrors in use are driven by voice coil, simultaneously capacitive sensor used as feedback component. While Eddy Current Sensor could have lot of advantages over one mirror. In this research prototype 150mm built, which 7 coil actuators, ECSs instead ones. experiment some standard low-order aberrations applied on be corrected expected, so it proved that ECS to take place one.
Since eddy current displacement sensors (ECDSs) are based on phenomenon of electromagnetic induction, their measurement results would be seriously disturbed by the magnetic interference. Traditional solution is to add a shield integrated in sensing probe, but it will also affect property coil. In this paper, an alternative proposed suppress low-frequency interference high-frequency signal conditioning circuits with deliberate filtering segments. Prototype ECDS provides resolution 20 nm...