Based on the measured remote sensing reflectance (Rrs) and phytoplankton pigment concentrations collected during seven cruises in the Bohai Sea, Yellow Sea and East China Sea from 2016 to 2018, we established the inversion models
This paper proposed a deep learning model based on a semantic segmentation neural network (UNet) for extracting floating macroalgae blooms effectively from the data of Geostationary Ocean Color Imager (GOCI) satellite sensors, ach
High-performance volume holographic gratings are important coupling elements for holographic waveguides, and small angular bandwidth and low average diffraction efficiency are major factors restricting the performance of volume ho
Acoustic sensor and photoacoustic cell are key components of laser-based photoacoustic spectroscopy. In this paper, we proposed an air-backed mandrel fiber optic microphone with a resonant photoacoustic tube, combining the technol
Aiming at the deficiency of the design of irradiance attenuators for solar simulators, we proposed a new design method of attenuators to improve their irradiance uniformity. According to the theory of Etendue, the mesh area of an
Aiming at the wide-field-of-view and high-resolution imaging requirements of the airborne photoelectric imaging systems, we design a multi-scale wide-field-of-view and high-resolution optical imaging system based on a concentric s
In different unwrapping algorithms, the minimum cost flow (MCF) unwrapping method can limit the long-range diffusion of the residue error. Further, it can first limit the error to the low coherent region, which ensures that the un
In the 3D reconstruction of color structured light, the non-linear coupling of systems, the topological structure of the test surface, and other factors will affect the decoding of structured light, which can lead to the missed de
In this study, the damage mechanism of thin film components is revealed by reconstructing the three-dimensional (3D) micro-morphology of a damaged optical film surface and by analyzing and studying the damage process and image dam
Infrared thermal radiation light source has important applications value in such fields as photoacoustic spectroscopy detection, and its light distribution characteristic is the basis of subsequent optical system design. In this p
Breast cancer is one of the malignant tumors with the highest mortality among women globally and its early detection helps to increase the survival rate of patients. In this paper, we mainly used the target detection network in de
Environmental vibrations introduce random tilt and phase-shifting errors in interferometric measurement, which reduce the accuracy of the final measurements. To reduce the influence of these vibrations, this article proposes anti-
We experimentally and theoretically investigated the mode competition and output power characteristics in the terahertz quantum cascade lasers of first-order distributed feedback based on a buried grating. The simulations obtained
In this paper, we propose a light-excited, dynamically switchable, dual-band terahertz metamaterial absorber based on a square ring-wire structure. By adjusting the insulation/conduction state of photosensitive silicon and germani
In this study, a wide-coverage and high-resolution airborne camera optical system is designed for wide-area and efficient aerial work demand of airborne camera. The optical system adopts a novel cascade structure of optical imagin
In this paper, a static correction method based on a fixed corrector and a lens array is proposed to correct the aberrations introduced by an onboard conformal window in a large scanning field of view. To be specific, first, a fix
Aiming at the problem of difficult adjustment of prism-grating-prism (PGP) imaging spectrometer, the method of correcting the chromatic aberration of PGP imaging spectrometer is used to ensure that the detector image plane is perp
A scheme for phase-matched passive-decoy-state quantum key distribution is proposed based on the heralded single photon source. In the scheme, both communication parties only need to generate one-intensity signals. The detection r
In this paper, a set of inversion algorithms for the micro-motion parameters in a retroreflector array was established based on the time-frequency signals of laser dynamic speckles. Firstly, the real-time intensitys formula of las
Information in visualizing flow field is needed for optimization in the aerodynamic opening process of parachute and in the process of optimizing aerodynamic shape of commercial aircraft. In this paper, based on the principle that
In order to meet the high-frequency on-orbit calibration requirements of the on-board load, the site automatic calibration technology is often used to invert the multi-spectral reflectance into the hyper spectral reflectance, so i
Molecular spectral parameters are fundamental data for IR radiation calculation. Currently, there is no such gas spectral database as the high resolution transmission molecular absorption database (HITRAN database) in China. In th
Ultrafast imaging is an important method for studying ultrafast phenomena such as explosions and high-voltage discharges. All-optical framing imaging has great development prospects because it can overcome the time limitation of o
Under the 45°/0° illumination observation conditions of various light sources, an evaluation method and measuring device are developed to measure the flash effect of metallic coatings. Based on different color distributions and sp