Applied Optics and Photonics China最新文献_第5页

DP-OOK to QPSK conversion based on vector phase-sensitive amplification bridging core and access networks 基于矢量相位敏感放大的 DP-OOK 到 QPSK 转换，架起核心网络和接入网络的桥梁

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007642

Zhaoyang Liu, Jiabin Cui, Yuefeng Ji

引用次数: 0

Spectral intersection over union: a bounding box overlap metric for hyperspectral object detection 光谱交集重于联合：用于高光谱物体检测的边界框重叠度量法

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3005336

Pengyu Wang, Kun Gao, Xiaodian Zhang, Zibo Hu, Xiansong Gu, Yutong Liu

{"title":"Spectral intersection over union: a bounding box overlap metric for hyperspectral object detection","authors":"Pengyu Wang, Kun Gao, Xiaodian Zhang, Zibo Hu, Xiansong Gu, Yutong Liu","doi":"10.1117/12.3005336","DOIUrl":"https://doi.org/10.1117/12.3005336","url":null,"abstract":"Hyperspectral images provide significant spatial and spectral information which are widely used in object detection. Two-stage detectors are commonly employed in hyperspectral object detection, where effective region proposals play a crucial role in accurate object localization. However, during non-maximum suppression (NMS) process, the Intersection over Union (IoU) metric based solely on spatial geometric information is inadequate for discriminating between similar proposals. This results in a substantial number of expected proposals with dissimilar characteristics are eliminated. In this paper, we analyze the spectral information in hyperspectral images to distinguish the characteristics of different proposals. Furthermore, this paper proposes the Spectral IoU (SIoU) by introducing spectral signature differences as a new metric. This improves the ability to differentiate between different object instances and increases the recall rate of bounding boxes with high localization confidence in region proposal stage. Moreover, SIoU can be simply integrated into the hyperspectral objection detection frameworks without introducing additional computational complexity. Extensive experiments on the Semi-Supervised Hyperspectral Object Detection Challenge dataset demonstrate the effectiveness of our method.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138963571","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

Study on identification method for Artemisia argyi floss 蒿草花鉴定方法研究

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007562

Zonghuan Liu, Anna Zhao, Yunhao Zhang, Chuo Li, Tianhe Wang, Jing Xu

引用次数: 0

Formation of nano-cone structures on silicon via maskless reactive ion etching 通过无掩模反应离子蚀刻在硅上形成纳米锥结构

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3008000

Jiacheng Lin, Hao Liu, Chen Jiang, Qi Wang, Kai Liu, Xiaomin Ren

引用次数: 0

The effect of amplitude and delay errors on the S21 of a multi-channel broadband microwave photonic link 振幅和延迟误差对多通道宽带微波光子链路 S21 的影响

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3006819

Yuan Huang, Shanting Fang, Nan Zhao, Xinmin Zhang

引用次数: 0

Optical spectrum selection for aerial target detection under complex backgrounds 复杂背景下空中目标探测的光学光谱选择

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3002174

Jiaqing Zhao, Xiang Ding, Zhongchao Xu, Zeya Li, Lei Zhang, Yonghong Xue, Shiwei Fan, Rongke Liu

{"title":"Optical spectrum selection for aerial target detection under complex backgrounds","authors":"Jiaqing Zhao, Xiang Ding, Zhongchao Xu, Zeya Li, Lei Zhang, Yonghong Xue, Shiwei Fan, Rongke Liu","doi":"10.1117/12.3002174","DOIUrl":"https://doi.org/10.1117/12.3002174","url":null,"abstract":"It is of strong practical significance to the management of civil aviation aircrafts through optical detection of aerial targets. A proper detection spectrum can help to enhance the target and suppress the background, guaranteeing the real-time accurate positioning and tracking of aerial targets over a wide range. Firstly, the principle of space-based air target detection is introduced. By analyzing the sources of the target radiation and background radiation, the contrast between target and background radiation intensity is determined as the evaluation standard for space-based detection. In simulations, three typical backgrounds (sea, farm and desert) and Boeing 737 aircraft were taken as examples. The apparent spectral radiance of the background in each spectral band was analyzed with the bulk and apparent spectral radiance of the aerial target under different detection conditions (detection azimuth angle, elevation angle, flight height). By traversing the 2~6 μm spectral range with a maximum spectral width of 1 μm, the contrast between target and background radiation intensity was calculated. 29 alternative spectral bands under 30 working conditions, including different flight altitudes, different backgrounds and different detection azimuth angels, were screened for the contrast between target and background radiation intensity exceeding the threshold of 2000. Considering changes in the upper and lower limit values of the contrast between the target and the background radiation intensity under each spectrum, background, target flight altitude and detection azimuth angle, the 2.53~2.54 μm spectrum could be used as one of the preferred spectral bands of the space-based aerial target optical detection system.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994629","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

Infrared time-sensitive target data augmentation algorithm based on generative model 基于生成模型的红外时敏目标数据增强算法

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3000067

Siyu Wang, Xiaogang Yang, Ruitao Lu, Qing-ge Li, Jiwei Fan, Zheng-jie Zhu

{"title":"Infrared time-sensitive target data augmentation algorithm based on generative model","authors":"Siyu Wang, Xiaogang Yang, Ruitao Lu, Qing-ge Li, Jiwei Fan, Zheng-jie Zhu","doi":"10.1117/12.3000067","DOIUrl":"https://doi.org/10.1117/12.3000067","url":null,"abstract":"Currently, infrared time-sensitive target detection technology is widely used in military and civil applications such as air defense and early warning, maritime surveillance, and precision guidance, but some high-value target images are difficult and expensive to acquire. To address the problems such as the lack of infrared time-sensitive target image data and the lack of multi-scene multi-target data for training, this paper proposes an infrared time-sensitive target data enhancement algorithm based on a generative model, which is a two-stage model. Firstly, in the first stage, the visible images containing time-sensitive targets are converted to infrared images by a modal conversion model based on CUT networks. Then in the second stage a large number of random targets are generated from the converted IR images using an adversarial random sample generation model to achieve the data enhancement effect. The coordinate attention mechanism is also introduced into the generator module in the second stage, which effectively enhances the feature extraction capability of the network. Finally, modal conversion experiments and sample random generation experiments are conducted, and the results show the feasibility of the data enhancement method of generative model proposed in this paper in IR time-sensitive target data enhancement, which provides a strong data support for improving IR time-sensitive target detection algorithm.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994945","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

Catalyst-free physical vapor deposition of crystalline PbSe nanosheets for fabrication of high-performance photodetector 用于制造高性能光探测器的无催化剂物理气相沉积结晶硒化铅纳米片

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3007081

Silu Peng, Chaoyi Zhang, Jiayue Han, Chunyu Li, Hongxi Zhou, Jun Wang

{"title":"Catalyst-free physical vapor deposition of crystalline PbSe nanosheets for fabrication of high-performance photodetector","authors":"Silu Peng, Chaoyi Zhang, Jiayue Han, Chunyu Li, Hongxi Zhou, Jun Wang","doi":"10.1117/12.3007081","DOIUrl":"https://doi.org/10.1117/12.3007081","url":null,"abstract":"Influenced by the prominent progress of two-dimensional (2D) layered crystals, the fabrication of 2D nanostructures from non-layered materials has attracted more and more attention. Lead selenide (PbSe) is one of the superior candidate materials for photodetector with suitable bandgap and outstanding photoelectric properties. The growth and device preparation of PbSe supply great interest for the development of high-performance infrared photodetectors. Although a lot of efforts have been paid on preparing PbSe nanostructures for miniaturized detectors, it is challenging to synthesize excellent crystallinity and thin 2D PbSe nanosheets because of itsinherent rock salt nonlayered structure. In this work, we employ a catalyst-free facile physical vapor deposition (PVD) method for controllable synthesis of PbSe nanosheets by van der Waals epitaxy technology. By optimizing the growth temperature, PbSe nanosheets from triangular pyramid island to square 2D plane can be obtained. In addition, the 2D PbSe nanosheets detector has a responsivity of 3.03 A/W at the wavelength of 520 nm with the power density of 5.05 mW/cm2. This work provides a facile strategy to synthesize high-quality 2D PbSe nanosheets which have enormous potentials to fabricate high-performance miniaturized photodetector.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994600","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

Design of driving and temperature control circuitry for VCSEL 设计用于 VCSEL 的驱动和温度控制电路

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3004979

Yan Wang, Zhengguang Wang, Helun Song, Wenbo Han

{"title":"Design of driving and temperature control circuitry for VCSEL","authors":"Yan Wang, Zhengguang Wang, Helun Song, Wenbo Han","doi":"10.1117/12.3004979","DOIUrl":"https://doi.org/10.1117/12.3004979","url":null,"abstract":"We design a laser driver and temperature control circuit based on the Field Programmable Gate Array (FPGA). Vertical-Cavity Surface-Emitting Laser (VCSEL) is the core device of the nuclear magnetic resonance gyroscope (NMRG). The accuracy of the laser output wavelength greatly affect the detection accuracy of NMRG. In order to improve the accuracy of VCSEL in this application system, in this paper we research the working principle of the laser and analyze the relationship between the laser output wavelength, the driving current and the laser operating temperature through theoretical analysis. We design and built the laser driving and temperature control circuit by using constant current source and the MAX1978, which use FPGA as the main control chip. By setting different voltage values, the laser output corresponds to different wavelengths. We analyze the result of experiment and theoretical calculate through the spectrometer. The result shows that the current regulation error is better than 0.03mA. For the laser temperature control circuit, we used the LTSPICE to simulate the PID control circuit of the compensation loop ,the finally result is consistent with the expected results.","PeriodicalId":298662,"journal":{"name":"Applied Optics and Photonics China","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994627","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

Overview of the application of VOCs gas leakage infrared thermal imaging technology in the field of petrochemical industry VOCs 气体泄漏红外热成像技术在石油化工领域的应用概述

Applied Optics and Photonics China Pub Date : 2023-12-18 DOI: 10.1117/12.3006687

Jian L. Zhan, Yi G. Wu, Sheng Tao, Jing J. Xu, Han Wu, Bin Fan, Hai C. Wang, Bi C. Xia

引用次数: 0