A5032845380- Optical measurement and interference techniques
- Superconducting and THz Device Technology
- Advanced Measurement and Metrology Techniques
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Advanced MEMS and NEMS Technologies
- Astronomy and Astrophysical Research
- Surface Roughness and Optical Measurements
- Advanced Measurement and Detection Methods
- Acoustic Wave Resonator Technologies
- Calibration and Measurement Techniques
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Mechanical stress and fatigue analysis
- Physics of Superconductivity and Magnetism
- Mechanical and Optical Resonators
- GNSS positioning and interference
- Image Processing Techniques and Applications
- Structural Load-Bearing Analysis
- Inertial Sensor and Navigation
- Astrophysics and Cosmic Phenomena
- Mechanical Behavior of Composites
East Asian Observatory
2018-2024
China Southern Power Grid (China)
2023
Chinese People's Liberation Army
2023
Shanghai Academy of Spaceflight Technology
2018-2022
Shanghai Industrial Technology Institute
2020
AviChina Industry & Technology (China)
2020
National Astronomical Observatories
2020
Purple Mountain Observatory
2013-2018
University of Chinese Academy of Sciences
2017
National University of Defense Technology
2015
Abstract The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is the James Clerk Maxwell Telescope’s continuum imager, operating simultaneously at 450 and 850 μ m. SCUBA-2 was commissioned in 2009–2011, since that time, regular observations of point-like standard sources have been performed whenever instrument use. Expanding calibrator observation sample by an order magnitude compared to previous work, this paper we derive updated opacity relations each wavelength for a new atmospheric...
Hemispherical Resonator Gyro (HRG) is a new type gyro with high precision, reliability, shock resistance, no need of preheating, short start time, and long life. It kind vibrating standing wave rotating along the sensitive base annular precession, has unique application prospect in field precision inertial sensors, widely used unmanned aerial vehicle control complex environments. Based on theory structure characteristics hemispherical resonator, mathematical model energy resonator...
This paper reports an improved method of frequency splitting for hemispherical resonator based on the standing wave swing effect. Firstly, effect and measurement are analyzed theoretically. Secondly, it is validated by simulations experiment. At last, experimental results discussed. The show that, value can be easily obtained measuring period Using this method, resolution could reach to 0.0002Hz if Q factor 1.5 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The Coriolis Vibratory Gyroscopes are a type of sensors that measure angular velocities through the effect. resonator is critical component CVGs, vibrational characteristics which, including resonant frequency, frequency mismatch, Q factor, and factor asymmetry, have great influence on performance CVG. mismatch resonator, in particular, directly determine precision drift gyroscope. Although natural properties they can change with external conditions, such as temperature, pressure, forces. In...
New challenges in submillimeter wave astronomy require instruments with a combination of high sensitivity and angular resolution, wide field view multiwave (multicolor) spectral range. large single mm/submm telescopes are demand, as well their inclusion the global Event Horizon Telescope (EHT) VLBI network. At same time, there no Asia at all while appropriate sites exist appearance or Eurasia is long overdue. Kinetic inductance detectors (KID) ideal for large-format array implementation,...
In the phase measuring deflectometry, error caused by nonlinear intensity response, called gamma distortion, can negatively affect measurement quality of specular surfaces. Based on generic exponential four-step phase-shifting fringe modal, this paper proposes a flexible and simple retrieval method to eliminate errors without complex calibration or additional patterns. The experimental results illustrate that proposed accurately retrieve phases from distorted patterns with Gamma precision...
The measurement of resonator’s frequency splitting is a critical issue in vibratory gyroscopes, which would be elaborately treated practical applications. high‐precision plays significant role tuning control. A novel time‐domain method for hemispherical resonator based on the standing wave swing effect was proposed. value can directly obtained by taking reciprocal one cycle time swings, rather than through difference between two resonant modes. To begin with, analyzed theoretically, and...
SCUBA-2 is a world leading wide field submillimeter camera on the JCMT with two, large format background limited TES arrays, which are used to image simultaneously in 450μm and 850um atmospheric windows. has been producing excellent science for over 6 years however, as we reported previously, excess in-band power loading of arrays concern. One possibility that considered was currently installed hot-pressed filters at 4K stage were being warmed significantly above by incoming infrared...
<title>Abstract</title> Aim to the current lack of standardized testing for prepreg tack, this paper established a quantitative method tack - compression-to-tension method, and proposed parameter Compression Tack Index (<italic>CTI</italic>) as evaluation index tack. The / metal carbon fiber reinforced epoxy were evaluated verified applicability comparing with qualitative vertical plates. results show that is suitable unidirectional prepregs fabric good repeatability stability test results,...
We present the instrument integration and on-sky commissioning results for Kuntur, LLAMA 690GHz receiver, on loan to James Clerk Maxwell Telescope (JCMT). The receiver is a state-of-the-art sideband-separating (2SB), dual polarization built by Netherlands Research School Astronomy (NOVA) laboratory at Groningen, Large Latin American Millimeter Array (LLAMA), Argentina. In collaboration with LLAMA, Institute of Astrophysics, Academia Sinica, Taiwan (ASIAA) Greenland (GLT), cartridge WCA have...
Stereo deflectometry can specify the position of a workpiece and reduce difficulty geometrical calibration. But measurement scope is limited, this issue especially severe for complex surfaces. A method proposed to extend measuring stereo deflectometry. The nominal model surface under test aligned with overlapped area vision system, other areas outside region are measured using monoscopic SCOTS approach each camera, respectively. This effectively combines advantages deflectometry, accuracy...
China is planning to build a 5-m THz telescope named DATE5 at Dome A in Antarctica. The will operate 0.85 and 1.5 frequency bands. waveguide superconductor-insulator-superconductor (SIS) mixer developed for the band by utilizing parallel-connected tunnel junctions (PCTJ) with Nb/AlN/NbN trilayer NbTiN/SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Al microstrip tuning circuit on quartz substrate. Its response measured...
Due to the poor dynamic positioning precision of Global Positioning System (GPS), Time Series Analysis (TSA) and Kalman filter technology are used construct error GPS. According statistical characteristics autocorrelation function partial sample data, Autoregressive (AR) model which is based on a determined, GPS combined with eliminate random in data. The least square method for parameter estimation adaptability tests, experimental results show that absolute value maximum longitude latitude,...
The hemispherical shell resonator (HSR) is the core and sensitive part of a gyro. geometrical accuracy vibration properties HSR determine navigation performance system. A lack areal measurement methods modes limits investigation kinetic mechanism improvement in performance. Consequently, an method developed based on deflectometry. blurry spots image plane reflected from vibrating are extracted, blurring trajectories obtained by Wiener deconvolution method. amplitude distribution standing...
Namakanui is an instrument containing three inserts in ALMA type Dewar. The are 'Ala'ihi, 'U'ū and 'Āweoweo operating around 86, 230 345GHz. receiver being commissioned on the JCMT. It will be used for both Single dish VLBI observations. We present commissioning results system.
The life and damage of hemispherical resonator are important factors that directly affect the service time safety high‐precision gyro. However, fused silica glass material used in which was processed China is mainly imported, it too expensive to use traditional fatigue experiment, so necessary software analysis analyze its life. In paper, ANSYS resonator, determine dangerous parts caused by residual stress crack propagation parts, obtain sum intensity factor, as effectively monitor prevent...
The Sub-millimeter Common-User Bolometer Array 2 (SCUBA-2) large format Transition Edge Sensor (TES) arrays are optimized to maximize mapping speed with two commissioned regular observing scan patterns. ancillary instruments POLarimeter (POL-2) and Fourier Transform Spectrometer (FTS-2) impose different demands on the compared stand-alone SCUBA-2 observing. This includes a change in background optical power loading requirement for larger dynamic range from individual TES bolometers. In this...
The measurement of aspheric optics has attracted intensive attention in precision engineering, and efficient in-situ technologies are required urgently. Phase measuring deflectometry is a powerful method for complex specular surfaces. In this paper, an developed based on the sub-aperture deflectometry. A complete procedure developed, including initial calibration, self-adaptive route planning, imaging acquisition, phase retrieval, gradient calculation, surface reconstruction stitching....
The dual wavelength interferometry in digital holography can eliminate 2π ambiguities with a large synthetic wavelength, but the measurement error tends to be amplified. In this paper, new numerical algorithm is proposed reduce amplification error, and further expand range. wrapped phase map associated one used assist unwrapping other wavelength. Since these two maps correspond same step height, an exhaustive searching method applied. will not amplified linearly controlled at level single...