A5010271794- Calibration and Measurement Techniques
- Advanced Sensor Technologies Research
- Atmospheric Ozone and Climate
- Scientific Measurement and Uncertainty Evaluation
- Radiative Heat Transfer Studies
- Infrared Target Detection Methodologies
- Urban Heat Island Mitigation
- Thermal Radiation and Cooling Technologies
- Chemical Thermodynamics and Molecular Structure
- Adaptive optics and wavefront sensing
- Spacecraft Design and Technology
- Carbon Nanotubes in Composites
- Spacecraft and Cryogenic Technologies
- Atmospheric aerosols and clouds
- Spectroscopy and Laser Applications
- MXene and MAX Phase Materials
- 2D Materials and Applications
- Photonic Crystals and Applications
- Superconducting Materials and Applications
- Heat Transfer and Optimization
- Optical Coatings and Gratings
- Flow Measurement and Analysis
- Advanced Thermodynamic Systems and Engines
- Electrohydrodynamics and Fluid Dynamics
- Thermal properties of materials
National Institute of Metrology
2013-2025
Shandong Academy of Sciences
2024
Qilu University of Technology
2024
North University of China
2024
Abstract In this study, we realized the triple point (TP) temperature of sulfur hexafluoride (SF 6 ) at National Institute Metrology (NIM), China. To end, designed an iso-thermal and immersion type apparatus with open cell a height 18 cm, diameter 5 capacity approximately 275 ml. The was four thermometer wells for simultaneous measurements standard platinum resistance thermometers (SPRTs). is connected two buffer tanks that allow sufficient amount SF to surround during solidification melting...
Miniature fixed-point blackbody (MFPB) can realize the on-orbit calibration of temperatures by tracing miniature fixed-point. This ability effectively improve precision and life span earth observation systems. Researchers have verified feasibility MFPB in engineering through experiments. However, temperature relationship between is unclear at present, which means that transfer radiation space infrared standard source international scale cannot be established accurately. In this article, a...
The leakage current of GaN Schottky barrier ultraviolet photodetectors is investigated. It found that the adopting undoped instead lightly Si-doped as an active layer show a much lower even when they have higher dislocation density. also density Ga vacancies in than GaN. may enhance tunneling and reduce effective height, leading to increase current. suggests used layer, it necessary photodetector.
National Institute of Metrology, China (NIM) and Physical Laboratory, UK (NPL) blackbody cavities based on the ITS-90 freezing points In, Sn, Zn Al have been compared by radiation thermometry. The average differences between Sn Zn, measured NPL InGaAs thermometer, are 5.3, 2.2 −7.3 mK, respectively, Al, NIM 1.4, −5.8 13.7 respectively. These well within uncertainties comparison. reference sources from 156 °C to 1000 were verified using both thermometers calibrated at fixed points. radiance...
The vacuum radiance temperature standard facility (VRTSF) is used to determine the traceability of calibration blackbodies accurately for infrared remote sensing. However, internal surfaces VRTSF can emit thermal radiation, which introduces stray light and reduces measurement accuracy. Previously, background subtraction was eliminate light, without considering dynamic changes in environment. Therefore, we propose a changeable veiling glare index (CVGI) evaluate performance based on concept...
For on-orbit radiometric calibration of infrared (IR) satellite instruments, we have developed a blackbody source whose temperature can be accurately determined by use miniature phase change cells to provide fixed points. The temperatures and reproducibility six containing H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O, Ga–Sn alloy, Ga–Zn phenyl salicylate (PS), succinonitrile, Ga were the measurement plateaux. points measured using...
Highly emissive spaceborne blackbody radiation sources are important devices for infrared value traceability by providing accurate to calibrate load. To meet the needs of calibration accuracy needed remote sensing, this paper proposes a highly that uses cubic reflection and an absorption method based on light capture. An emissivity simulation ray tracing was carried out. The influences specular (SR), near (NSR), diffuse (DR) were analyzed. Two blackbodies with NSR DR fabricated, simulated,...