基于太赫兹时域光谱技术的钢材锈蚀产物光学参数测量及特征识别  

Optical Parameter Measurement and Characteristic Identification for Corrosion Products of Steel Materials Based on Terahertz Time-Domain Spectroscopy

作　　者：江雪雷 李恩恩 许颖 王天武 谢雯羽 Jiang Xuelei;Li Enen;Xu Ying;Wang Tianwu;Xie Wenyu(Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,Guangdong,China;Shenzhen Key Laboratory of Urban&Civil Engineering Disaster Prevention&Reduction,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,Guangdong,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Key Laboratory of Electromagnetic Radiation and Sensing Technology,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;GBA Branch of Aerospace Information Research Institute,Chinese Academy of Sciences,Guangzhou 510700,Guangdong,China)

机构地区：[1]哈尔滨工业大学(深圳)深圳市土木工程智能结构系统重点实验室,广东深圳518055 [2]哈尔滨工业大学(深圳)深圳市城市与土木工程防灾减灾重点实验室,广东深圳518055 [3]中国科学院空天信息创新研究院,北京100094 [4]中国科学院电磁辐射与探测技术重点实验室,北京100190 [5]中国科学院大学电子电气与通信工程学院,北京100049 [6]广东大湾区空天信息研究院,广东广州510700

出　　处：《光学学报》2023年第11期54-62,共9页Acta Optica Sinica

基　　金：国家自然科学基金(51778191,52078173,61988102);深圳市重点实验室筹建启动项目(ZDSYS20200810113601005)。

摘　　要：锈蚀对钢材料(如钢筋,钢板等)的强度和耐久性具有较大的影响。研究发现在钢材锈蚀过程中产生的一些铁的氧化物能够与太赫兹(THz)电磁波表现出吸收共振。为了探究钢材锈蚀产物的光学参数并实现其特征识别,首先通过太赫兹时域光谱(THz-TDS)系统测定了不同种类的锈蚀产物样品以及样品中的主要组分Fe_(3)O_(4),Fe_(2)O_(3),α-FeOOH的THz透射信号。在有效测定频率0~1.2 THz范围内,不同锈蚀产物混合物样品的折射率分布在2.7~3.4之间,组分晶体Fe_(3)O_(4)、Fe_(2)O_(3)、α-FeOOH的折射率分别为4.0、2.7、2.2。锈蚀产物混合物中Fe_(3)O_(4)的含量对光学参数,如吸收系数、折射率等的影响较大。然后,搭建了基于双色场的超宽带THz-TDS系统,进一步扩大THz的有效测定范围至0~10 THz,从而实现了对锈蚀产物的特征识别。在0~10 THz范围内,Fe_(3)O_(4)不存在特征吸收峰,Fe_(2)O_(3)的特征吸收峰位置为3.4、4.2、4.85、5.8 THz,α-FeOOH的特征吸收峰位置为3.6、4.05、5、5.45 THz。同时,对不同锈蚀产物样品的宽频THz吸收谱进行分析,能够实现Fe_(2)O_(3)和α-FeOOH的特征识别。研究结果表明,Fe_(2)O_(3)和α-FeOOH的特征吸收峰可以作为是否发生锈蚀的依据,该结果为THz技术在钢材锈蚀无损检测方面的应用奠定了基础。Objective Corrosion has a great impact on the strength and durability of steel materials(such as rebar and steel plate).Research reveals the absorption resonance of some iron oxides produced during steel material corrosion with terahertz(THz)electromagnetic waves.Moreover,THz waves can penetrate common coating materials.Therefore,THz spectroscopy has application potential in nondestructive testing of the early corrosion of steel materials.To investigate the optical parameters of the corrosion products of steel materials and identify the characteristics of the products,we measured the THz transmission signals of different kinds of corrosion product samples and the main component crystals Fe 3O4,Fe_(2)O_(3),andαFeOOH in the samples with a THz timedomain spectroscopy(THzTDS)system.The experimental results show that in the effective frequency range of 0-1.2 THz,the refractive indexes of the mixture samples of different corrosion products are in the range of 2.7-3.4,and those of the component crystals Fe_(3)O_(4),Fe_(2)O_(3),andαFeOOH are 4.0,2.7,and 2.2,respectively.The content of Fe_(3)O_(4) in the corrosion product mixture has a substantial influence on the optical parameters,such as absorption coefficient and refractive index.Then,we built an ultrawideband THzTDS system based on the twocolor field to further extend the effective THz measurement range to 0-10 THz.The results indicate that within 0-10 THz,no characteristic absorption peaks of Fe_(3)O_(4) are observed.In contrast,the characteristic absorption peaks of Fe_(2)O_(3) are located at 3.4 THz,4.2 THz,4.85 THz,and 5.8 THz,respectively,and those ofα-FeOOH are located at 3.6 THz,4.05 THz,5 THz,and 5.45 THz,respectively.In addition,this THz method can identify the characteristics of Fe_(2)O_(3) andα-FeOOH from the THz absorption spectra of the samples of different corrosion products.Suggesting that the occurrence of steel material corrosion can be determined according to the characteristic absorption peaks of Fe_(2)O_(3) andαFeOOH,the experimental results

关 键 词：太赫兹光谱 锈蚀 光学参数 特征吸收峰 

分 类 号：O433[机械工程—光学工程]