ObjectiveThermal protection materials, with their excellent thermal insulation and mechanical properties, have been widely used in the aerospace field. However, during the service life of reusable vehicles, impacts from airborne i

ObjectiveInfrared detectors play an essential role in the fields of infrared imaging, medical analysis, missile warning, biochemical gas detection and security monitoring. Among them, InAs/InAsSb, a type II superlattice material g

Significance In recent localized wars, infrared imaging-guided missiles and multi-mode composite guidance weapons, such as air-to-air, air-to-ground, and air-to-sea types, have been widely used in actual combat to strike important

ObjectiveSpace-based laser radar (lidar) technology is widely acknowledged as an indispensable detection method in critical fields such as geospatial mapping and national defense. The 532 nm/1064 nm dual-band reflectance coating c

ObjectiveSatellite laser ranging (SLR) is a high-precision satellite orbit measurement method. Laser reflectors, as a key payload for SLR, have been used on many Earth orbit satellites and play an important role in fields such as

ObjectiveLaser trackers, known for their high precision in large-scale geometric measurements, play a crucial role in industries such as aerospace and precision manufacturing. These sophisticated instruments are employed to ensure

ObjectiveDoppler wind lidar makes use of the principle of optical Doppler shift between signal and reference light to measure radial velocity at different distances. Compared with other traditional wind sensing methods, wind lidar

ObjectiveThe wind field in the middle and upper atmosphere is pivotal to our daily lives as well as the aerospace field. Rayleigh scattering wind lidars, possessing distinct advantages, play an instrumental role in probing these a

Objective This study aims to develop a novel method for measuring diffusion flow velocities based on temperature gradient inversion, which is particularly effective in density-driven flow fields. The proposed method addresses the

ObjectiveSalinity is one of the most important parameters in oceanography. The study of high-precision measurement technology of ocean salinity has far-reaching significance for revealing the influence of distribution and change o

ObjectiveSeawater density, as a critical parameter governing oceanic dynamic processes, demands precise measurement for advancing marine environmental studies. While optical sensors offer inherent advantages in density measurement

ObjectiveAs the most important main support structure of a space telescope, the cylindrical mirror barrel structure accounts for a relatively large proportion of the mass. Due to the larger number of lens groups and larger system

ObjectiveLaser interference is a significant issue in imaging systems, where interference spots can obscure key target information, leading to a considerable degradation in image quality and complicating subsequent image analysis

ObjectiveNon-Line-of-Sight (NLOS) imaging is a technique that calculates the imaging of a target behind an obstacle through an intermediary. The emergence of this technology is driven by the need to obtain data in complex environm

ObjectivePropose an inspection method for food packaging that integrates differential Raman spectroscopy, feature extraction using the VGG16 model, and cluster analysis, as well as a method for expanding differential Raman spectra

ObjectiveWith the development and utilization of lakes by people, the problem of eutrophication in lakes has also intensified. By evaluating the nutritional status of lakes, people can understand the water quality of lakes, analyz

ObjectiveHaze degradation of near-earth remote sensing images due to atmospheric aerosol scattering is a significant challenge in remote sensing applications. It not only reduces image quality but also impairs the accuracy of down

ObjectiveHyperspectral and multispectral image fusion is a widely used technique to generate high-resolution hyperspectral images (HR-HSI) by combining the spatial details of multispectral images (MSI) with the spectral richness o

ObjectiveThe purpose of this study is to develop a simple, rapid, accurate, and non-destructive classification method for black ballpoint pen ink markings. This method is designed to address the need for a reliable and efficient t

ObjectivePicosecond pulsed lasers with a GHz repetition rate are commonly used in biophotonics, laser industrial processing, and high-speed precision measurement due to their high repetition rate and short pulse duration. To contr

ObjectiveThe mid-infrared spectral region of 2-20 µm, containing the molecular fingerprint region and atmospheric window, is considered one of the most promising spectral regions in the area of spectroscopic research. Mid-infrared

ObjectiveMethane (CH4) is one of the major greenhouse gases in the atmosphere, second only to carbon dioxide (CO2) in atmospheric content, but its contribution to the greenhouse effect per unit concentration is about 25 times that

ObjectiveThe design of a high-performance hyperspectral imaging spectrometer with a large field of view and broad spectral range is crucial for advanced environment monitoring and remote sensing. Such instruments are needed on air

Significance Hyperspectral remote sensing faces the persistent challenge of mixed pixels, where sub-pixel heterogeneity compromises analytical accuracy. Hyperspectral unmixing addresses this by decomposing mixed pixels into pure m

Objective Infrared optical system is vital for aircraft in the terminal stage. As a fragile part of optical system, optical windows are under the threat of external environment, which could bring interference and damage to the win

ObjectiveThe 633 nm iodine-stabilized He-Ne laser, based on saturated absorption frequency stabilization, is globally recognized as a national length standard due to its high stability, long lifespan, good wavelength reproducibili

ObjectiveInfrared detection technology plays a crucial role in meteorological observation, ground detection, and astronomical observation. To enhance the sensitivity and reduce background noise of the infrared detector, it is nece

ObjectiveThe aberration of high-altitude deformable mirror (DM) in multi-conjugate adaptive optics (MCAO) system can lead to the decrease of the image contrast of the extended target and the decline of the closed-loop capability o

ObjectiveOptical frequency combs, which are critical for bridging microwaves and optics, represent significant advancements in optical frequency metrology. They are of paramount importance for high-precision spectral analysis, acc

ObjectiveSince its inception, the definition methods of the International System of Units (SI) have not remained static. With the continuous advancement of science and technology, the definitional benchmarks for SI physical quanti

ObjectiveAfter the deployment of satellite antennas in orbit, they are prone to deformation and vibration due to various factors, which can affect observational performance. Single measurement methods struggle to meet the demands

ObjectiveIn terms of micro-nano structure measurement and determination, the fusion measurement of multiple traceability methods and measurement methods has become a trend of future measurement. Taking linewidth measurement as an

ObjectiveMicro nano gratings, as subwavelength structural optical benchmarks, are periodic structural optical elements that achieve precise control of light field phase and energy through photolithography, etching, ion implantatio

ObjectiveWith the development of industry, high temperature sensing is widely used in the industrial field, which not only requires high precision, good stability and fast response of high temperature sensors, but also hopes to re

ObjectivePolarization imaging reveals distinct targets that are difficult to distinguish in conventional optical imaging by capturing the polarization or depolarization characteristics of light after it is reflected, refracted, or