Earth and Space From Infrared to Terahertz (ESIT 2022)最新文献

{"title":"Test of a 15-20 K Stirling/pulse tube hybrid refrigerator for space applications","authors":"Kongkuai Ying, Shaoshuai Liu, Zhenhua Jiang, Lei Ding, Yinong Wu","doi":"10.1117/12.2665312","DOIUrl":"https://doi.org/10.1117/12.2665312","url":null,"abstract":"The two stages gas-coupled Stirling/pulse tube refrigerator (SPR), whose first and second stages respectively involve Stirling and pulse tube refrigeration cycles, is a promising spaceborne refrigerator. The SPR has many advantages because of the unique configuration combining each feature of the Stirling and pulse tube refrigerators, such as compact structure, high reliability, and outstanding performance. A SPR-20 has been designed and manufactured. When all of the regenerators are filled with stainless-steel mesh, the SPR-20 can obtain 2.6 W at 70 K plus 0.1 W at 20 K with 160 W total input power. While the second stage regenerator is mixed filled with magnetic material and stainless-steel mesh, the cooling capacity of the SPR-20 can be improved to 2.5 W@70 K plus 0.45 W@20 K with 200 W electric input power plus 17 W displacer input electrical power. Meanwhile, the SPR can obtain 0.32 W at 15 K plus 0.65 W at 65 K with 250 W compressor input power plus 20 W displacer input electrical power. The performance of the developed Stirling/pulse tube hybrid refrigerator (SPR-20) has a relative advantage among 20 K high-frequency refrigerators.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127461735","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}

{"title":"Application and outlook of terahertz in various areas","authors":"Xianglin Niu, Mingjian Gu, Yiqi Zhu","doi":"10.1117/12.2664541","DOIUrl":"https://doi.org/10.1117/12.2664541","url":null,"abstract":"This paper illustrates properties of terahertz electromagnetic wave. Terahertz has been applied widely in areas of military, biologic monitoring, aerospace and environment monitoring. This paper presents application and outlook of terahertz in various areas, which is meaningful to the research of terahertz.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129700181","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}

{"title":"Research on high gain-bandwidth product mid-wavelength infrared HgCdTe avalanche photodiodes","authors":"Hao Xie, Huijun Guo, Liqi Zhu, Liao Yang, Chuan Shen, Baile Chen, Lu Chen, Li He","doi":"10.1117/12.2665553","DOIUrl":"https://doi.org/10.1117/12.2665553","url":null,"abstract":"HgCdTe avalanche photodiodes (APD) have been demonstrated to be one of the most promising paths for low flux and high speed applications. The bandwidth of HgCdTe e-APD has been theoretically predicted to be independent of the gain, owed to its strongly dominant electron multiplication. However, when the photocurrent is high, a large number of electrons exists in the depletion region, and the electrical field in the depletion region might collapse due to the space charge effect, thus limiting the increase of the gain-bandwidth product. In this work, the structure of the device was optimized by simulation, and the effect of the light injection dose on the electric field and bandwidth of the device was studied. Finally, a mid-wavelength infrared HgCdTe e-APD device whose bandwidth almost doesn't decrease with the increase of gain is fabricated. The response bandwidth of the APD is about 480MHz @ gain=625, corresponding to a gain-bandwidth product of 300GHz.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128737078","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}

{"title":"An unsupervised symmetric tensor network for change detection in multitemporal hyperspectral images","authors":"Cheng Liang, Zhao Chen","doi":"10.1117/12.2664567","DOIUrl":"https://doi.org/10.1117/12.2664567","url":null,"abstract":"Since Hyperspectral images (HSIs) contain a large amount of spectral information, they can provide detailed spectral information and enable accurate CD. However, the spectral heterogeneity of HSIs may lead to false alarms which will reduce detection accuracy. Additionally, it is difficult to collect and annotate pixel-level labels for CD in HSIs. Therefore, we propose an unsupervised symmetric tensor network (USTN) for HSIs CD. We design a novel multidimensional symmetric tensor framework to solve the problem of high-dimensional data processing. Furthermore, the framework integrates a spatial edge loss to preserve detailed spectral-spatial information. Finally, we use feature fusion to suppress the invariant components (i.e., the background) and highlight the variant components (i.e., temporal changes). Experiments on two sets of multitemporal HSIs, Hermiston and Bay Area, demonstrate the effectiveness of USTN for binary change detection.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125510028","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}

{"title":"Probabilistic analysis and evaluation of classical line error band models of ε-band, G-band, and standard deviation band","authors":"Lejingyi Zhou, Yanmin Jin, X. Tong","doi":"10.1117/12.2665822","DOIUrl":"https://doi.org/10.1117/12.2665822","url":null,"abstract":"The line error band models have been extensively used for evaluating the position errors of the line features in surveying, remote sensing, etc.. Although there have been several classical line error band models, the shapes and the probabilities of those models have not been unified. In this paper, the probabilities of line segment falling in its several representative line error bands, namely ε-band, G-band and standard deviation band, are estimated though simulated experiments. A probability-related evaluation index is proposed to evaluate the error models with the aim to provide suggestions for selection of different error models in various scenarios.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121732487","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}

{"title":"High performance very long wave infrared quantum cascade detector","authors":"K. Guo, K. Li, Y. X. Zhu, J. Liu, S. M. Liu, F. Q. Liu, X. H. Wang, Z. P. Wei","doi":"10.1117/12.2664941","DOIUrl":"https://doi.org/10.1117/12.2664941","url":null,"abstract":"In this letter, we introduce a very long wave infrared Quantum Cascade Detector (QCD) with a peak response wavelength of 14.5 μm based on a twin-well coupled absorption region design. Different to standard, single transition well QCDs, the twin-well design effectively enhances the absorption strength of the device and broadens the response spectrum to a certain extent. At 77 K, we observed a responsivity of 3.51 mA / W and a Johnson noise limited detectivity of 1×108 Jones. Altogether, this design resulted in detection at temperatures of up to 140 K with a calibrated black-body source by light coupling using a 45° wedge. These high performance very long wave QCDs are expected to provide pollution monitoring, deep space exploration and other applications.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121911566","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}

{"title":"Spatial-spectral graph regularized sparse nonnegative matrix factorization hyperspectral unmixing","authors":"Lin Lei, Hao Zhang, Shaoquan Zhang, Chengzhi Deng, Fan Li, Shengqian Wang","doi":"10.1117/12.2665779","DOIUrl":"https://doi.org/10.1117/12.2665779","url":null,"abstract":"Compared with traditional remote sensing images, hyperspectral images have the advantages of high spectral resolution, combining images with spectrum, and continuous spectrum. The phenomenon of mixed pixels in hyperspectral images seriously affects the accuracy of distinguishing objects on the ground, and has always been an important problem that hinders the further development of this technology. The most effective way to solve the mixed pixel problem is to perform mixed pixel unmixing. The purpose of hyperspectral unmixing is to obtain pure spectrum (endmembers) and their corresponding proportions (abundance). The nonnegative matrix factorization (NMF) technique has been widely adopted in the hyperspectral images unmixing problem due to its own advantages. The NMF method based on sparsity constraint can achieve better unmixing effect because of fully using of the sparse characteristic of the data. However, the unmixing model based on the sparse NMF still has shortcomings. Hyperspectral images contain a large amount of geometric structural information, which is not considered by most existing sparse NMF methods. To address those shortcomings, new regularization terms and weights can be introduced into the NMF model to better promote the unmixing performance. To solve this problem, a novel unmixing algorithm named spatial-spectral graph regularized sparse non-negative matrix factorization (SSGNMF) algorithm is proposed in this paper. Most of the sparse constrained unmixing algorithms have the problem of insufficient prior representation of abundance sparsity and using of spatial information insufficiently. On the one hand, the model of SSGNMF introduces graph regularization to preserve high-dimensional spatial information in hyperspectral images. On the other hand, the spatial weighting factor enables more spatial information to be incorporated into the unmixing model, and the spectral weighting factor can promote row sparsity of abundance matrices. By comparing with other classical algorithms, simulated and real hyperspectral data experimental results demonstrate that the introduction of dual weights and graph regularization can improve the unmixing effect, which verifies the validity of this algorithm. In addition, the experimental results also show that the graph regularization term and dual weights introduced in the NMF model in this paper can indeed promote the hyperspectral image unmixing performance well.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123079448","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}

{"title":"The magic of III-Vs","authors":"Yonggang Zhang, Yi Gu, Yingjie Ma, X. Shao, Xue Li, H. Gong, Jia-xiong Fang","doi":"10.1117/12.2664543","DOIUrl":"https://doi.org/10.1117/12.2664543","url":null,"abstract":"III-V compound semiconductors have abundant features for various electronic, optoelectronic and photonic applications, all arise from variform magic combination of group III and group V elements formed binaries, resulting in ever-changing characteristics. In this paper, diversified ternaries, quaternaries and quinaries are presented geometrically based on the binaries of arsenide, phosphide and antimonide, mainly concerned of their bandgap, lattice constant and the lattice match domain on different substrates. The features of nitride and dilute nitride, bismide and dilute bismuth, as well as boride, are also discussed briefly. An overall observation of whole III-Vs may contribute to the comprehensive understanding of their latent capacity and sustainable development, along with many challenges.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126427068","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}

{"title":"Design of cooled infrared bionic compound eye optical system with large field-of-view","authors":"Yang Yu, Yingzhi Chi, Lin-han Li, Xiao-yu Wang, Jun Chen, Juan Yue, Yuxuan Gu, Haichung Su, Sili Gao","doi":"10.1117/12.2664573","DOIUrl":"https://doi.org/10.1117/12.2664573","url":null,"abstract":"A multi-aperture compound eye infrared optical system is designed for the imaging of cooled medium wave infrared detector. The optical system includes an infrared lenslet array arranged on the front spherical surface, and a relay infrared optical system matched with a cooled infrared detector. The problem of matching and connection between the infrared lenslet array arranged on a spherical surface and the relay infrared optical system matching with a cooled infrared detector is solved, and a set of multi aperture infrared bionic compound eye optical system that can match the cooled infrared detector is designed. Through the relay optical system, the focal surface imaged by the curved infrared lenslet array of compound eye is re-imaged on the focal plane of the cooled infrared detector. The waveband of the designed compound eye infrared optical system is 3.7-4.8μm. The total focal length is 3.5mm, the total field of view of the multi aperture compound eye optical system is 108°, the distortion of the full field of view is less than 6%. The design result shows that the image quality of the system with different aperture approaches the diffraction limit, and has the advantages of multi-aperture, large field-of-view, low distortion and ideal image quality.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"12505 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128995593","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}

{"title":"Passivation of InSb photodetectors with atomic layer deposited Al2O3","authors":"Ailiang Cui, X. Zhu, Zhenming Ji, Peng Wei, Yanqiu Lv","doi":"10.1117/12.2665588","DOIUrl":"https://doi.org/10.1117/12.2665588","url":null,"abstract":"The preparation of surface passivation layers on InSb is essential in the process of device fabrication. An Al2O3 passivation film was deposited on the surface of medium wave InSb film by atomic layer deposition (ALD). A series of variable area photodiode devices with different P/A ratios were fabricated. The performance of the device is characterized at 77K. The effects of ALD Al2O3 and anodic oxidation on the leakage current of diode devices were investigated. The surface leakage current of the passivated photodetectors was reduced by an order of magnitude over the anode sulfidation passivated photodetectors. Moreover, the metal-insulator-semiconductor (MIS) device were developed respectively, and the effects of different films as a dielectric layer on the interfacial characteristics were investigated.","PeriodicalId":258680,"journal":{"name":"Earth and Space From Infrared to Terahertz (ESIT 2022)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131423015","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}