Article(id=1241431093233119285, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241431088673911802, articleNumber=null, orderNo=null, doi=10.12347/j.ycyk.20240703001, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1719936000000, receivedDateStr=2024-07-03, revisedDate=1724688000000, revisedDateStr=2024-08-27, acceptedDate=null, acceptedDateStr=null, onlineDate=1773909837300, onlineDateStr=2026-03-19, pubDate=null, pubDateStr=null, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773909837300, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773909837300, creator=13701087609, updateTime=1773909837300, updator=13701087609, issue=Issue{id=1241431088673911802, tenantId=1146029695717560320, journalId=1238841944844054536, year='2024', volume='45', issue='6', pageStart='1', pageEnd='130', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773909836213, creator=13701087609, updateTime=1773916903270, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241460731791602369, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241431088673911802, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241460731791602370, tenantId=1146029695717560320, journalId=1238841944844054536, issueId=1241431088673911802, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=78, endPage=85, ext={EN=ArticleExt(id=1241431093505749055, articleId=1241431093233119285, tenantId=1146029695717560320, journalId=1238841944844054536, language=EN, title=Research Overview and Application Prospects of Terahertz Atmospheric Transmission Characteristics, columnId=1239133503154081962, journalTitle=Journal of Telemetry, Tracking and Command, columnName=TT & C Communication and Navigation, runingTitle=null, highlight=null, articleAbstract=

The paper provides a brief overview of the development of terahertz technology and its advantages in various appli-cation scenarios, including high resolution and strong anti-stealth characteristics in radar. Regarding terahertz atmospheric transmis-sion characteristics, the paper focuses on the basic principles of the MPM and provides an overview and comparison of mainstream atmospheric transmission models like the ATM model and AM model. At the same time, this paper also introduces recent research developments and progress on terahertz atmospheric transmission characteristics domestically and internationally. Finally, this paper summarizes the development of terahertz technology and offers prospects for its applications.

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介绍了太赫兹技术的发展概况及其在部分应用场景中的优势,如在雷达中具有高分辨率、强反隐身特性等。在太赫兹大气传输特性方面,重点介绍了MPM模型基本原理,并对主流的大气传输模型如ATM模型、AM模型做了简要的介绍与比较。同时介绍了近年来国内外对太赫兹大气传输特性的研究概况与新的进展,并对太赫兹技术的发展进行了总结与应用层面的展望。

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徐晨辉 2001年生,硕士研究生。

张光锋 1975年生,副研究员,硕士生导师。

樊振宏 1978年生,教授,博士生导师。

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High Power Laser and Particle Beams, 2024, 36(8): 63-69., articleTitle=A 320 GHz frequency tripler based on face-to-face differ-ential structure, refAbstract=null)], funds=[Fund(id=1241431105006531088, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, awardId=62231016, language=CN, fundingSource=国家自然科学基金重点项目(62231016), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1241431100396990785, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, xref=null, ext=[AuthorCompanyExt(id=1241431100401185090, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, companyId=1241431100396990785, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Microelectronics(School of Integrated Circuits), Nanjing University of Science and Technology, Nanjing 210094, China), AuthorCompanyExt(id=1241431100413768004, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, companyId=1241431100396990785, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=南京理工大学微电子学院(集成电路学院) 南京 210094)])], figs=[ArticleFig(id=1241431102326370765, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=EN, label=Fig. 1, caption=Absorption spectra of oxygen and water vapor, figureFileSmall=RS8XP2qwg5q56BKNYJU1yw==, figureFileBig=T80jkPBAlnaXhBguMIaDEQ==, tableContent=null), ArticleFig(id=1241431102439616982, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=CN, label=图1, caption=氧气与水蒸气的吸收谱, figureFileSmall=RS8XP2qwg5q56BKNYJU1yw==, figureFileBig=T80jkPBAlnaXhBguMIaDEQ==, tableContent=null), ArticleFig(id=1241431103928594909, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=EN, label=Fig.2, caption=Atmospheric attenuation of terahertz waves under skies, figureFileSmall=Qarv/KbEWc/PWgwpF38IJA==, figureFileBig=rWbJ2bVvGAb1D2qJ2HJyXw==, tableContent=null), ArticleFig(id=1241431104029258211, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=CN, label=图2, caption=晴空下太赫兹波的大气损耗, figureFileSmall=Qarv/KbEWc/PWgwpF38IJA==, figureFileBig=rWbJ2bVvGAb1D2qJ2HJyXw==, tableContent=null), ArticleFig(id=1241431104192836071, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=EN, label=Fig.3, caption=Attenuation in foggy weather, figureFileSmall=jldCQBnLovZTcc0Wkq6uCQ==, figureFileBig=+1CHxri/LtEbA44rF2p1Rg==, tableContent=null), ArticleFig(id=1241431104310276593, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=CN, label=图3, caption=云雾天气下的信号衰减, figureFileSmall=jldCQBnLovZTcc0Wkq6uCQ==, figureFileBig=+1CHxri/LtEbA44rF2p1Rg==, tableContent=null), ArticleFig(id=1241431104444494325, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=EN, label=Fig.4, caption=Comparison of transmission loss under low visibility and clear sky conditions, figureFileSmall=cNWl8GNp3+ipmFHbMuCZrw==, figureFileBig=+fqVFfOth6EOtzKpRVf5dA==, tableContent=null), ArticleFig(id=1241431104624849405, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=CN, label=图4, caption=低能见度下与晴空传输损耗对比, figureFileSmall=cNWl8GNp3+ipmFHbMuCZrw==, figureFileBig=+fqVFfOth6EOtzKpRVf5dA==, tableContent=null), ArticleFig(id=1241431104725512708, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=EN, label=Table 1, caption=

Common terahertz transmission models

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大气传输模型名称适用频段模型功能及应用主要优缺点
大气分段传输模型0~0.35 THz估算均匀大气中的传播衰减及延迟特性最早的研究太赫兹大气传输特性的模型,但模型的数据精度和适用性受限
大气毫米波传输模型(MPM)0~1 THz计算晴空、云雾天气下太赫兹波大气衰减目前应用最广泛的模型,考虑了各种气象条件与环境变量的影响。但频率适用范围较小,在极端条件下准确性较差,且并未考虑大气中的微量气体造成的影响
长波大气光谱传输模型(ATM)0~10 THz具有高光谱分辨率,可应用于天文观测、遥感及通信等领域在0~2 THz范围内拟合较好但模型未考虑散射对衰减的影响。
全球大气模型(AM)0.25 THz ~2 THz利用数据库谱线参数计算微波到太赫兹波的大气传输衰减使用高精度的吸收线参数库,在极端天气条件下存在一定的局限性。
太赫兹波大气传输衰减模型(VVWH)0.1~1 THz在短距离太赫兹无线通信及太赫兹雷达具有较高的应用价值在低频段具有更高的精确度
), ArticleFig(id=1241431104847147528, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1241431093233119285, language=CN, label=表1, caption=

常用太赫兹传输模型

, figureFileSmall=null, figureFileBig=null, tableContent=
大气传输模型名称适用频段模型功能及应用主要优缺点
大气分段传输模型0~0.35 THz估算均匀大气中的传播衰减及延迟特性最早的研究太赫兹大气传输特性的模型,但模型的数据精度和适用性受限
大气毫米波传输模型(MPM)0~1 THz计算晴空、云雾天气下太赫兹波大气衰减目前应用最广泛的模型,考虑了各种气象条件与环境变量的影响。但频率适用范围较小,在极端条件下准确性较差,且并未考虑大气中的微量气体造成的影响
长波大气光谱传输模型(ATM)0~10 THz具有高光谱分辨率,可应用于天文观测、遥感及通信等领域在0~2 THz范围内拟合较好但模型未考虑散射对衰减的影响。
全球大气模型(AM)0.25 THz ~2 THz利用数据库谱线参数计算微波到太赫兹波的大气传输衰减使用高精度的吸收线参数库,在极端天气条件下存在一定的局限性。
太赫兹波大气传输衰减模型(VVWH)0.1~1 THz在短距离太赫兹无线通信及太赫兹雷达具有较高的应用价值在低频段具有更高的精确度
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太赫兹大气传输特性的研究概况与应用展望
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徐晨辉 , 张光锋 , 樊振宏
遥测遥控 | 测控通信与导航 2024,45(6): 78-85
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遥测遥控 | 测控通信与导航 2024, 45(6): 78-85
太赫兹大气传输特性的研究概况与应用展望
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徐晨辉, 张光锋, 樊振宏
作者信息
  • 南京理工大学微电子学院(集成电路学院) 南京 210094
  • 徐晨辉 2001年生,硕士研究生。

    张光锋 1975年生,副研究员,硕士生导师。

    樊振宏 1978年生,教授,博士生导师。

Research Overview and Application Prospects of Terahertz Atmospheric Transmission Characteristics
Chenhui XU, Guangfeng ZHANG, Zhenhong FAN
Affiliations
  • School of Microelectronics(School of Integrated Circuits), Nanjing University of Science and Technology, Nanjing 210094, China
doi: 10.12347/j.ycyk.20240703001
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介绍了太赫兹技术的发展概况及其在部分应用场景中的优势,如在雷达中具有高分辨率、强反隐身特性等。在太赫兹大气传输特性方面,重点介绍了MPM模型基本原理,并对主流的大气传输模型如ATM模型、AM模型做了简要的介绍与比较。同时介绍了近年来国内外对太赫兹大气传输特性的研究概况与新的进展,并对太赫兹技术的发展进行了总结与应用层面的展望。

太赫兹技术  /  太赫兹雷达  /  大气传输特性

The paper provides a brief overview of the development of terahertz technology and its advantages in various appli-cation scenarios, including high resolution and strong anti-stealth characteristics in radar. Regarding terahertz atmospheric transmis-sion characteristics, the paper focuses on the basic principles of the MPM and provides an overview and comparison of mainstream atmospheric transmission models like the ATM model and AM model. At the same time, this paper also introduces recent research developments and progress on terahertz atmospheric transmission characteristics domestically and internationally. Finally, this paper summarizes the development of terahertz technology and offers prospects for its applications.

Terahertz  /  Terahertz radar  /  Atmospheric transmission characteristics
徐晨辉, 张光锋, 樊振宏. 太赫兹大气传输特性的研究概况与应用展望. 遥测遥控, 2024 , 45 (6) : 78 -85 . DOI: 10.12347/j.ycyk.20240703001
Chenhui XU, Guangfeng ZHANG, Zhenhong FAN. Research Overview and Application Prospects of Terahertz Atmospheric Transmission Characteristics[J]. Journal of Telemetry, Tracking and Command, 2024 , 45 (6) : 78 -85 . DOI: 10.12347/j.ycyk.20240703001
太赫兹(Terahertz)波是指频率范围在0.1 THz ~10 THz、波长在3 000 μm~30 μm的电磁波。尽管在自然界中充斥着大量的太赫兹波,但在20世纪80年代之前,由于没有高效的太赫兹源以及缺乏相对有效的太赫兹探测技术,人们对太赫兹波段的电磁波并未进行深入的研究,太赫兹波成为广阔电磁波谱中鲜为人知的一段空白,被称为“太赫兹空隙”(Terahertz Gap)[1]。随着量子力学、固体物理学的发展以及超快激光技术的发展,太赫兹源的种类逐渐增多,如量子级联激光器[2](Quan-tum Cascade Laser,QCL)、真空太赫兹器件[35]以及基于自由电子激光技术的加速器太赫兹源[6,7]等器件的产生,拓宽了太赫兹技术的应用范围。随着对太赫兹波研究的深入,人们发现太赫兹波有许多不可比拟的优秀特性。例如,太赫兹雷达相较于传统的微波雷达具有分辨率更高[8,9]、反隐身性能卓越等优势[10,11]
目前,在通信领域,太赫兹技术已经成为6G无线通信技术的关键性技术之一[12],其对于实现高速、大容量的数据传输发挥着至关重要的作用。但由于太赫兹波的频率较高,当其在大气空间中传播时会受到大气中的水蒸气、沙尘等因素的影响而产生衰减。因此研究太赫兹波在大气空间中的传输特性,相关结果对于太赫兹技术在大气空间中的应用具有十分重要的意义。
太赫兹波在大气中的传输过程中受到多种因素的影响,这些因素主要包括大气成分吸收、大气散射等。其中,大气成分吸收包括水蒸气吸收与氧气吸收,由于水分子在太赫兹波段具有多条吸收谱线,因此水蒸气是大气中对太赫兹波吸收影响显著的成分之一。大气散射通常包括瑞利(Rayleigh)散射和米氏(Mie)散射。大气毫米波传输模型(Millimeter-Wave Propagation Model,MPM)由著名大气遥感领域专家Liebe H J [13]于1989年提出,其主要通过计算30条水蒸气的吸收谱线、44条氧气的吸收谱线、空气的连续吸收谱线,随着模型的不断改进能够较为精确地得到1 GHz~1 000 GHz范围内太赫兹波的衰减特性。这一模型被广泛用于通信、遥感等相关领域。
通过累加水蒸气和氧气的吸收谱线可以精确地得到在1 000 GHz频率范围内由于水蒸气和干燥大气所造成的比衰减。但在较低频率下(10 GHz以下)需要考虑氧气的非谐振Debye频谱造成的影响,而在较高频率(100 GHz以上)需要考虑气压造成的氮气吸收。
气体比衰减的计算方法如下:
其中,(f)与(f)表示该频率相关的大气复折射率的虚部。f是频率(单位:GHz)
式(2)、式(3)中,SiSj分别表示氧气和水蒸气第i条、第j条谱线的强度(单位:kHz),FiFj是氧气和水蒸气的谱线形状因子。N''D是由于气压造成的氮气衰减Debye频谱产生的干空气连续吸收谱。
其中:
Si=a1×10-7ea2(1-θ)
Sj=b1×10-13.5eb2()1-θ
θ为大气温度的反向温度(单位:K),根据国际电信联盟ITU-R P.835-6建议书[14],可得到氧气分压p与水汽分压q
FiFj为氧气和水蒸气的谱线函数:
对于水蒸气的吸收谱:
其中,∆foxygn为考虑氧气塞曼分裂的谱线宽度,fj是水蒸气第j条谱线的中心频率。∆fwatervapor是考虑水蒸气谱线的多普勒展宽后修正的谱宽。线强S、修正因子δ及式中所有参数均可在查阅MPM模型的相关参数后得到[15]
10 GHz以下氧气的非谐振Debye频谱与100 GHz以上气压造成的氮气吸收ND
其中,d是Debye频谱中的宽度参数,在温度为25 ℃、水汽含量7.5 g/m3、大气压强1 013 hPa的条件下结果如图1所示。
由式(1)可得到晴空下太赫兹波在大气传输过程中的损耗情况,如图2所示。
在云雾天气情况下通过悬浮水滴的消光截面来计算衰减[16],然后再在晴空模型的基础上加上悬浮液滴的折射吸收谱即可得到云雾天气下的吸收谱。
在云、雾天气下,在MPM模型中,为了简化计算可以使用瑞利吸收近似替代Mie散射理论。通过Rayleigh吸收近似公式将云雾的复折射率表示为:
其中,W为含水量(单位g/m3),ε'ε″分别为水的复介电常数的实部和虚部,可用double-Debye模型[17]求解:
其中,fp、fs分别为主、次弛豫频率(单位:GHz)。
计算云雾的复折射率再代入式(1)中,即可得到云雾天气下的吸收谱,如图3所示。
图4给出了低能见度下(水汽含量0.9 g/m3)与晴空条件下太赫兹波传输损耗对比。
常用的太赫兹大气传输模型主要有:
① 1978年Dutton E J[18]等人提出了大气传输模型主要采用分段的方法,分别研究不同频段内的大气传输特性,最高适用频率为0.35 THz。该模型在考虑不同气象条件(如晴空、云雾和降雨)的基础上,描述了信号传输过程中出现的衰减和相位延迟特性。不过该模型将大气假设为均匀介质,未考虑大气湍流和大气多层次的不均匀性。随着遥感探测技术的发展,研究人员获得了更复杂、精确的大气数据,该模型基于上世纪70年代的实验数据建立,具有很大的局限性。
② MPM模型由Liebe于1989年提出,估算了0~1 THz频段内电磁波的大气衰减、相位延迟曲线,并不断修正,已成为描述毫米波和太赫兹波大气传播特性的经典模型。MPM模型主要基于电磁波在大气中的吸收和散射理论。模型考虑了各种气象条件(如雨、雾、霾)和大气成分对太赫兹波传播的影响。该模型充分考虑了各种成分(尤其是水蒸气和氧气)的吸收作用,并涵盖了大气压强、温度、湿度等环境变量带来的影响来预测信号的衰减。不过原始的MPM模型对复杂气象条件下的模拟过于简单,如在降雨条件下其并未考虑降雨的尺寸分布(DSD)及雨滴粒子特性,这导致该模型的预测准确性下降。同时MPM模型的频率适用范围(10 GHz ~1 000 GHz)较小,并且在极端天气下(如大雾、暴雨、沙尘暴)的准确性较差,并且MPM模型未将大气中的Ar、CO2等微量气体考虑在内。然而,截至目前MPM模型仍是研究太赫兹波在雨、雾条件下大气传输特性的一个重要模型。
③ PARDO J R[19]在2001年提出了长波大气光谱传输模型(Atmospheric Transmission at Micro-waves,ATM),该模型对大气进行剖面解析,将大气按照不同高度层分割,分别计算每层的吸收特性并结合高度积分获得总衰减。该模型在0~2 THz频段内较精确且最高适用频率高达10 THz,但此模型并未包含散射对衰减的影响。目前,ATM模型因其精度和适用性被运用到遥感和通信等诸多领域。
④ 2012年,Paine[20,21]提出了AM(atmospheric model)模型,AM模型使用高精度的吸收线参数库,这些数据库提供了详细的分子吸收线参数,包括频率、强度、半宽度等,如HITRAN(High-resolution Transmission Molecular Absorption)和MT-CKD(Mlawer-Tobin-Clough-Kneizys-Davies)模型,是一个覆盖微波频段到亚毫米波段的大气辐射传输模拟工具。
目前,国内的研究大多集中在低频太赫兹波在大气空间的传输特性,以及雾、沙尘、雨、冰粒及其他大气气溶胶粒子对太赫兹波散射的影响。2015年,中国工程物理研究院的王玉文等基于修正后的VVW谱性函数和辐射传输色散理论、水汽连续体吸收模型利用HITRAN数据库建立了一个太赫兹波大气传输衰减模型[21](VVWH),并与国际已有的模型(如MPM模型)进行对比,结果符合预期。2019年,南京理工大学的娄国伟教授[22,23]等对频率范围在100 GHz~1 000 GHz的短毫米波的目标辐射特性进行了研究。表1对几种常用的太赫兹传输模型进行了归纳。
2023年,华北电力大学曹相春[24]计算了降雨条件下地空链路上太赫兹波的衰减损耗,并对原有的降雨衰减模型进行了修正,具体方法是将地空链路在垂直梯度高度上进行分层,按照高度修正每一层的温度,按照M-P雨滴尺寸分布函数通过Mie理论与双德拜模型计算雨滴粒子对太赫兹波的消光系数,最后积分得到总衰减。结果表明该修正后的模型相较于原有雨衰模型大大提高了降雨条件下太赫兹波沿地空路径传输损耗的精确度。2014年,西安电子科技大学王蓉蓉[25,26]等计算了太赫兹波入射下雾滴粒子的消光系数,并得到了太赫兹波段信号在不同能见度的雾中的传播特性。2015年,许文忠[27]根据Mie散射理论与Monte-Carlo方法研究了在不同沙尘浓度与不同沙尘粒子存在的天气下太赫兹波单次和多次散射特性并计算了太赫兹波的传输衰减。
20世纪80年代,美国空军地球物理实验室(AFGL)和波士顿大学开发了LOWTRAN[28,29](Low-resolution Atmospheric Transmission)软件并基于此开发了该软件的升级版本MODTRAN,是用于大气透过率和辐射传输计算的软件工具。经过数十年的更新,目前该软件于2017年更新至MODTRAN6[30,31]版本。2007年中科院大气光学中心[32,33]研发了一套通用辐射大气传输软件CART,2020年更新后的CART2版本具有0.1 cm-1光谱分辨率,能够分辨出单个大气分子吸收谱线,可以更精确地模拟大气分子的吸收,并可以在中高光谱分辨率的光学工程和部分激光工程的大气传输计算中应用。
2016年,西安电子科技大学与中国电波传播研究所搭建了国内第一套0.34 THz大气传播测试系统[34],该系统的太赫兹源采用14.16 GHz为输入信号,经三倍频放大后再经过3个倍频器至0.34 THz,基于此系统的实验数据可以建立起0.34 THz的大气传输特性,为该频段相关的通信及无线电系统设计提供基础。
太赫兹波能够支持远超现有微波和毫米波通信系统的数据传输速率。这使得太赫兹波非常适用于卫星通信和星际通信,满足未来高数据量、低延迟的通信需求。太赫兹大气传输特性的研究是实现太赫兹空间通信应用的关键技术[35]。目前,关于太赫兹在短程通信中的研究已取得不错的进展[36-38]。对于远距离空间通信如地空间通信、平流层内空对空通信、星际间卫星之间的通信等存在一些问题。目前,大多数太赫兹空间通信的研究集中在对流层内,而对流层又是地球大气中成分最复杂的一部分,其中含有大量的水汽并且绝大多数天气现象都发生在对流层,再加之没有高效稳定的大功率太赫兹源,这使得目前太赫兹波在对流层的传输损耗较大,无法在对流层实现中远距离的传输。不过太赫兹波存在大气传输窗口(低吸收区),通过精确测量,对这些窗口进行建模,可以在空间通信中利用这些窗口频段来减少信号衰减,提高通信链路的有效性和稳定性。同时,2019年北京遥测技术研究所的钟育民论证了基于太赫兹技术的通信系统有望解决超高音速飞行器再入大气层时的“黑障”通信问题[39]。2016年,西安电子科技大学陈伟[40]等对太赫兹波在超高音速飞行器再入大气层时产生的等离子鞘套中的传播特性进行了研究,并结合计算结果分析了时空非均匀等离子鞘套对太赫兹波传输特性的影响。
太赫兹波的波长与典型的冰云粒子尺寸相当,使其在冰云和冷云的观测中具有优势。太赫兹遥感技术可以提供有关云冰含量、粒子尺寸等重要信息,为研究冰云的辐射特性和气候影响提供数据支持。例如2020年华中科技大学的陈柯[41]等人利用DOTLRT辐射传输模式对太赫兹冰云辐射散射特性进行了研究。目前,太赫兹技术在大气遥感领域的应用潜力已逐渐显现,但太赫兹波在穿过大气层时也存在严重衰减,限制了遥感设备的性能,因此通过研究太赫兹大气传输特性能够极大地推进太赫兹大气遥感应用的发展。
建立准确的太赫兹大气传输模型是研究太赫兹大气传输特性的核心问题,现已有部分文献关于太赫兹大气传输特性的研究,但大多数研究都是针对某一特定频率或低频段太赫兹波的传输特性建模进行传输衰减分析,缺乏对宽频带太赫兹波尤其是高频段太赫兹波的传输特性较为精确、系统的研究。一方面,目前所使用的大部分谱线数据是基于仿真计算模拟得出,缺乏以实验为基础的大气各成分吸收谱线的精确数据;另一方面,世界不同地区的大气各成分含量存在明显差异,甚至同一地区的大气成分也存在明显的时变特征,这为建立具有普适性和精确性的太赫兹波大气传输特性模型带来了很大的困难。因此,未来针对太赫兹大气传输特性的研究应该聚焦以下几个方面。
① 进一步关注大气中各成分对太赫兹波的吸收、散射特性。尤其是大气中微量气体所造成的影响,如Ar、CO、O3等。同时由于MPM模型中关于水汽的连续吸收谱是通过经验公式得到的,所以应围绕水汽对太赫兹波的连续吸收问题开展深入研究。
② 太赫兹大气传输特性的研究涉及电磁波与电磁场、大气科学与气象学、光学与光谱学、固体电子学等多学科交叉。针对大气成分变异影响太赫兹大气传输模型精确性与普适性的问题,可以通过对不同地理区域的大气成分进行系统研究,建立不同区域的大气成分数据库。这将有助于理解和建模各区域内太赫兹波传输特性的差异,为制定更具普适性的传输模型提供基础数据支持。开展大气成分的时变特性研究,捕捉不同时间段内大气成分的动态变化。通过长时间的监测和数据积累,建立能够反映大气成分时变特征的动态模型,采用动态模型将提高太赫兹波传输特性模型的时效性和精确性。另外,太赫兹源的设计制造涉及固体电子学等学科,目前大部分太赫兹源都是通过倍频器级联实现的,并且转化效率较低,不能满足目前对高效大功率太赫兹源的需求[42],因此目前通过实验测量太赫兹波的传输衰减还有一定难度,但随着技术的不断突破,实验测量太赫兹波传输衰减或将实现。
③ 针对目前高频段宽频带太赫兹波在大气传输过程中衰减特性研究的不足,未来针对这一频段建立衰减模型或在现有模型的基础上进行改进均存在许多困难,需要随着研究的不断深入逐步积累经验。
随着无线设备和应用的普及,人们对带宽的需求显著增加。太赫兹波能提供广阔的带宽,未来无线通信载波必然向太赫兹频谱扩展,而且太赫兹通信技术有望对超高音速飞行器再入大气层时产生“黑障”现象导致通信中断这一问题的解决提供了新的可能。
由于太赫兹波成像系统具有穿透性强、分辨率高等优点,使得其在安防、反隐身目标探测中具有重要应用。太赫兹波对许多气体具有特定的吸收谱线,可用于对大气污染物和温室气体的监测。
但太赫兹技术也面临限制与挑战。如太赫兹波在大气传输过程中的衰减与散射较高,限制了其有效传输距离,因此研究太赫兹大气传输特性是必要的。同时关于太赫兹源和探测器等器件的开发仍需突破,特别是在成本、稳定性与高效性方面。
随着科技的不断进步,太赫兹技术将在通信、遥感以及环境监测等领域得到广泛应用。
  • 国家自然科学基金重点项目(62231016)
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2024年第45卷第6期
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doi: 10.12347/j.ycyk.20240703001
  • 接收时间:2024-07-03
  • 首发时间:2026-03-19
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  • 收稿日期:2024-07-03
  • 修回日期:2024-08-27
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国家自然科学基金重点项目(62231016)
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    南京理工大学微电子学院(集成电路学院) 南京 210094
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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