Applied Optics and Photonics China最新文献_第3页

Analysis and exploration of spatial and spectral information with small-footprint hyperspectral lidar returns 利用小型高光谱激光雷达回波分析和探索空间和光谱信息

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3003887

Jia-jie Dong, Shi-long Xu, Yu-hao Xia

{"title":"Analysis and exploration of spatial and spectral information with small-footprint hyperspectral lidar returns","authors":"Jia-jie Dong, Shi-long Xu, Yu-hao Xia","doi":"10.1117/12.3003887","DOIUrl":"https://doi.org/10.1117/12.3003887","url":null,"abstract":"Full-waveform hyperspectral light detection and ranging (FWHSL) is vital in retrieving spatial and spectral information during laser scanning. Four main influence factors, the distance between two neighbor targets, the coverage ratio, the incident angle, and the target's reflectance, determine the information of the FWHSL returns. Previous studies mainly focus on the influence of the neighbor distance, incident angle, and reflectance, while we focus on the coverage ratio of the targets in a laser footprint. We propose a novel multispectral waveform decomposition method, including the Trust-Region algorithm for single wavelength waveform decomposition, 3σ rule for screening decomposition results and correction between multispectral waveform decomposition, to obtain the accurate spatial and spectral information from the multispectral returns, which realizes the decomposition error less than 0.3cm when the neighbor distance is 40cm, for a 4ns pulse width LiDAR signal. We find the intensity and overlapped ratio of the returns are strongly related to the coverage ratio, which may accelerate the progress in point cloud information extraction and target recognition.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"312 ","pages":"129590D - 129590D-15"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-resolution focus-tunable one-photon miniaturized fluorescence microscope for imaging in freely moving animals 用于自由移动动物成像的高分辨率聚焦可调单光子微型荧光显微镜

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007740

Xiaoyu Liu, Zenan Wu, Junnan Xu, W. Gong, Ke Si

{"title":"High-resolution focus-tunable one-photon miniaturized fluorescence microscope for imaging in freely moving animals","authors":"Xiaoyu Liu, Zenan Wu, Junnan Xu, W. Gong, Ke Si","doi":"10.1117/12.3007740","DOIUrl":"https://doi.org/10.1117/12.3007740","url":null,"abstract":"The relationship between neural activity, brain function, and corresponding biological behaviors remains a significant challenge in neuroscience. Exploring this relationship needs various optical imaging techniques to acquire real-time data with high spatial resolution. A promising technology recently is wearable miniaturized microscopes (mini scopes), which enable long-term neural activity recording in freely moving animals. However, most one-photon mini-scopes have limitations for imaging in-depth with high resolution and large field of view (FOV). To address this, we developed a one-photon miniaturized fluorescence microscope (1P-miniFM), intended for imaging of live brain neurons in free-behaving animals at subcellular level (~1.2 μm). We conducted specially designed optical path, achieving an imaging FOV of ~700 × 400 μm. In addition, we incorporated an electrowetting lens (EWL) to achieve a wide range of ~300 μm z-axis scanning with little resolution loss. 1P-miniFM is compact (11 × 17 × 24 mm) and lightweight (~2.9 g), causing little impediment to animals’ spontaneous behaviors. With genetically encoded calcium indicator GCaMP6s, we monitored neuron activities in secondary motor cortex (M2) during consecutive pain-related and sensory stimulations. We found that M2 neurons are key components and exhibit distinct variations in the response patterns. 1P-miniFM has potential as an excellent tool to explore relationships between neuron network and animal behaviors.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"25 5","pages":"129631Z - 129631Z-8"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A grayscale mapping method for infrared images based on generative adversarial networks 基于生成式对抗网络的红外图像灰度映射方法

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005506

Lin Cheng, Wenqing Hong, Xiaodong Wang, Chuanming Liu, Junbo Su, Lan Su, Chen Zhang

{"title":"A grayscale mapping method for infrared images based on generative adversarial networks","authors":"Lin Cheng, Wenqing Hong, Xiaodong Wang, Chuanming Liu, Junbo Su, Lan Su, Chen Zhang","doi":"10.1117/12.3005506","DOIUrl":"https://doi.org/10.1117/12.3005506","url":null,"abstract":"The grayscale mapping of infrared images is an important research direction in the field of infrared image visualization. The grayscale mapping method of infrared images directly determines important visualization indicators such as detail preservation and overall perception of the original infrared images and can be considered as the foundation and guarantee for detail enhancement. Although the current mainstream grayscale mapping methods for infrared images can achieve good mapping results, there is still room for improvement in terms of preserving image details and enhancing image contrast. In this paper, we propose a grayscale mapping method for infrared images based on generative adversarial networks. Firstly, our discriminator adopts a unique global-local structure, which allows the network to consider both global and local losses when calculating the loss, effectively improving the image quality in local regions of the mapped image. Secondly, we introduce perceptual loss in the loss function, which ensures that the generated image and the target image have consistent features as much as possible. We conducted subjective and objective evaluations on the mapping results of our method and eight mainstream methods. The evaluation results show that our method is superior in terms of preserving image details and enhancing image contrast. Further comparison with a parameter-free tone mapping operator using generative adversarial network (TMO-Net) indicates that our method avoids problems such as target edge blur and artifacts in the mapped images, resulting in higher visual quality of the mapped images.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"3 3","pages":"129660J - 129660J-15"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on atmospheric polarization characteristics measurement with different observation angles and wavelengths 用不同观测角度和波长测量大气偏振特性的实验研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008127

Bin Zhang, Chao Gao, Xiao-Yun Cao, Bingli Lei

{"title":"Experimental study on atmospheric polarization characteristics measurement with different observation angles and wavelengths","authors":"Bin Zhang, Chao Gao, Xiao-Yun Cao, Bingli Lei","doi":"10.1117/12.3008127","DOIUrl":"https://doi.org/10.1117/12.3008127","url":null,"abstract":"Considering the potential application demands of atmospheric polarization effects in fields such as navigation, remote sensing, and astronomical observations, experimental research has been conducted to investigate the variations of sky polarization degree under different scattering angles and wavelength conditions. The ideal analysis models of atmospheric polarization characteristics have been established based on the Rayleigh scattering theory. The distribution features of polarization degree and polarization angle in the sky were investigated, and their varying laws with the scattering angle were provided by the simulation study. An experimental system for measuring the atmospheric polarization characteristics was constructed using a turntable, division of focal plane (DoFP) polarization camera, telephoto lens, and bandpass filters. The atmospheric polarization patterns were measured and studied at different observing angles and wavelengths. The experimental results indicate that the magnitude of sky polarization degree is closely related to the scattering angle and it reaches its maximum near 90°. At the four experimental measurement wavelengths of 500 nm, 700 nm, 870 nm, and 1065 nm, the measured values of the sky polarization degree were 0.75, 0.64, 0.41, and 0.28, respectively. The sky polarization degree exhibits a downward trend with the increase of wavelength, and the atmospheric polarization effect gradually weakens with the increase of wavelength. These conclusions provide a meaningful reference for selecting appropriate observation angles and wavelength ranges in astronomical observation and remote sensing applications.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"66 1","pages":"129620N - 129620N-6"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A centre-scale sorting local contrast method for infrared small target detection 红外小目标探测的中心尺度分类局部对比法

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007626

Zuoxun Hou, Zijian Liu, Jiaqi Shen, Junhua Yan, Yin Zhang

引用次数: 0

Efficient and tolerant chip-to-chip optical coupling via silicon nitride grating couplers 通过氮化硅光栅耦合器实现高效且容差的芯片间光耦合

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005779

Jinghao Wang, Zhen Wang, Chen Hu, Huan Zhang, Kun Yin, Haitao Wang

引用次数: 0

Optofluidic integrated one-dimensional photonic crystal biosensor for tumor marker detection 用于检测肿瘤标记物的光流体集成一维光子晶体生物传感器

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3003776

Qing Shi, Shilun Feng, Jianlong Zhao

{"title":"Optofluidic integrated one-dimensional photonic crystal biosensor for tumor marker detection","authors":"Qing Shi, Shilun Feng, Jianlong Zhao","doi":"10.1117/12.3003776","DOIUrl":"https://doi.org/10.1117/12.3003776","url":null,"abstract":"We propose a silicon based optofluidic one-dimensional photonic crystal biosensor structure for tumor marker detection, which is composed of a nanobeam resonator transducer with excellent detection limit performance, a filter with low sidelobe jitter and a microfluidics roof. Using the three-dimensional finite difference time domain method, a one-dimensional photonic crystal slot nanobeam resonator transducer optimization model consisting of a circular hole array linearly decreasing from the center to both ends was obtained. Under the influence of absorption loss of biological solution, the transducer works in the communication E-band, with the Q value still up to 10538, refractive index sensitivity of 338 nm/RIU, and refractive index detection limit of 10-5 RIU, corresponding to the detection of fg/mL carcinoembryonic antigen, which can be directly used for the detection of tumor marker under the capture of antibody probes in microfluidics chip. By optimizing the apertures on both sides of one-dimensional photonic crystals with a taper shape, a cutoff filter with low sidelobe jitter can effectively filter out the high-order resonant peaks of the transducer, forming a large free wavelength detection range. The microfluidics channel is used to inject different refractive index liquids, and the cut-off wavelength can match the detection requirements of different concentrations of tumor markers. The sensor structure is expected to build a multi-channel parallel lab-on-chip through splitters and detect multiple tumor markers simultaneously.","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"140 1","pages":"129631U - 129631U-5"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lightweight design and analysis on thermal door of remote sensing satellite camera in low earth orbit 低地轨道遥感卫星相机热门的轻量化设计与分析

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007634

Baocheng Zou, Yanhui Jiang, Hui Zhao, Zhiqing Song, Tingyun Luo, Haibo Zhao

{"title":"Lightweight design and analysis on thermal door of remote sensing satellite camera in low earth orbit","authors":"Baocheng Zou, Yanhui Jiang, Hui Zhao, Zhiqing Song, Tingyun Luo, Haibo Zhao","doi":"10.1117/12.3007634","DOIUrl":"https://doi.org/10.1117/12.3007634","url":null,"abstract":"Remote sensing satellite in low earth orbit is a kind of spacecraft developed to meet the needs of high-resolution imaging observation, rapid response to emergency earth observation and disaster image monitoring. In this paper, a finite element model of a remote sensing satellite camera with a diameter of 800mm thermal protection door (thermal door for short) was established. The topological optimization design technology is used to design the thermal door structures with high-reliability, high-strength and ultra-light. After optimization, the weight of thermal door is 4.5Kg. The finite element simulation analysis is carried out on the thermal door, and the analysis results show that the thermal door meets the harsh mechanical conditions of a satellite platform. The mechanical test of thermal door was carried out, and the test results match the simulation analysis results. After the mechanical test, the thermal boundary and vacuum conditions in orbit were simulated in the thermal vacuum experiment tank, and the thermal door’s opening and closing tests were carried out. The thermal door’s opening/closing time, opening/closing speed, structural stability and positioning accuracy meet the index requirements. This thermal door has been developed and delivered to the satellite. The research results of this paper have a certain reference value for the design of thermal door for remote sensing satellite cameras with low power consumption and high temperature control requirements..","PeriodicalId":502341,"journal":{"name":"Applied Optics and Photonics China","volume":"136 3","pages":"129640G - 129640G-10"},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139174437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on detection method of airborne obstacle avoidance lidar 机载避障激光雷达探测方法研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007725

Xianzhe Wang, Xiao-dong Jia, Kui Zhou, Hao Zhang, Tao Zhou

引用次数: 0

A review of deep learning object detection methods for remote sensing images 遥感图像深度学习物体检测方法综述

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008145

Xueying Wang, Weishan Lu, Feng Zhang, Yuan D. Huang, Zhichao Sha, Shilin Zhou

引用次数: 0