Acoustic Non-Destructive Testing Technology in Concrete Bridge Inspection and Pile Foundation Detection

This article takes the actual construction project of a certain concrete bridge project as an example to analyze the application of acoustic non-destructive testing technology in its detection.It includes an overview of a certain bridge construction project studied and acoustic non-destructive testing technology and the application of acoustic non-destructive testing technology in actual testing.This analysis hopes to provide some guidelines for acoustic non-destructive testing of modern concrete bridge projects.

Discussion on the Status Quo of Non-Destructive Testing Technology in Highway Engineering and Strategies of Improving the Quality of Testing

Highway test and detection technology play a very important role in controlling the quality of road and bridge engineering and improving the maintenance of roads and bridges.The study of highway bridge test detection technology is both theoretically and practically useful.Road and bridge test and detection is a complicated task.With the development of science and technology,highway and bridge engineering test and detection technology has also made great progress.The continuous improvement of test and detection technology has brought good social benefits to road and bridge construction.This article discusses the problems in test and detection technology of highway bridges and how to improve the quality of test and detection.

Optical generation,detection and non-destructive testing applications of terahertz waves

Optoelectronic terahertz generation and detection play a key role in the applications of non-destructive testing,which involves different areas such as physics,biological,material science,imaging,explosions detection,astronomy applications,semiconductor technology and superconductiong electronics. In this article,we present a reviewof the principle and performance of typical terahertz sources,detectors and non-destructive testing applications. On this basis,the newdevelopment and trends of terahertz radiation detectors are also discussed.

微波毫米波与太赫兹噪声源发展现状

微波毫米波与太赫兹噪声源主要用于产生噪声信号,是噪声系数测试系统的核心组成部分。本文对近年来国内外噪声源的发展情况进行总结,将现有的噪声源归纳为基于数字和模拟电路技术、基于固态二极管技术、基于场效应管技术、基于黑体和热电阻技术、基于光电融合技术共5类噪声源,并对这5类噪声源的主要技术特点进行了分析,同时对各类型噪声源的国内外研究现状进行了对比,并对其应用前景和发展趋势进行了展望。

太赫兹技术在电气设备绝缘缺陷检测研究综述

太赫兹波在绝缘介质材料传播中不仅具有衰减小,准直性强,穿透性好等优点,而且在成像可视化方面具有较高的分辨率,深受电气设备绝缘缺陷检测领域学者的喜爱。首先概述了太赫兹波的产生和探测技术,介绍了太赫兹时域光谱技术和基于时域、频域信号的特征参量对绝缘缺陷成像的原理,给出了电气设备绝缘缺陷应用太赫兹波检测的典型案例,探讨了目前存在的探测方式选取、缺陷类型识别、在线监测可行性的相关问题,最后对太赫兹技术在电气设备绝缘缺陷检测领域的前景进行了展望。

基于太赫兹技术的复合材料无损检测研究综述

随着高性能复合材料在航空航天和军事等高新领域的广泛应用,对其质量和性能检查的要求愈加引起重视,如何通过各种方法对复合材料进行无损检测成为近年来研究人员关注的热点和研究方向。太赫兹波量子能量低,对大多数非极性物质透明,因此使用太赫兹技术对复合材料进行无损检测有着独特的应用优势。本文基于太赫兹技术的特点,对太赫兹时域光谱和太赫兹成像技术的无损检测分别进行了详细的论述,并总结了目前复合材料的太赫兹无损检测技术发展趋势,最后对其发展前景进行了展望。

碳纤维复合材料不同深度缺陷的太赫兹检测研究

太赫兹(THz)无损检测技术具有非破坏性、非电离和非接触的优点,在航空航天领域纤维增强复合材料无损检测中得到了较快的发展和应用。在碳纤维复合材料层合板的4个不同深度(0.225、0.450、0.675、0.900 mm)插入聚四氟乙烯作为人工缺陷,采用太赫兹时域光谱和成像系统对其进行成像和光谱分析,探讨太赫兹波辐射下缺陷的成像效果和光谱特性。研究结果发现,在0.25~2.0 THz频率范围内,太赫兹反射成像可以成功检测出碳纤维复合材料中不同深度缺陷:随着缺陷深度的增加,太赫兹频域成像信号和光谱信号随缺陷深度线性增大,吸收系数成像信号和光谱信号随缺陷深度线性减小;随着频率的增加,缺陷的功率谱密度先增大后减小,吸收系数缓慢增大。该结果可以为碳纤维复合材料缺陷深度的可视化和定量化分析提供参考依据。

太赫兹电磁波检测复合绝缘子内部缺陷可行性研究

复合绝缘子的电气性能和机械性能是输电线路安全运行的重要影响因素。研究使用太赫兹电磁波对复合绝缘子内部缺陷进行无损检测的可行性。该方法将激光器产生的太赫兹电磁波通过光路传输到绝缘子内部。利用脉冲电磁波在不同电磁介质内的传播特性,通过分析反射波的时域特征,判断复合绝缘子样品内部的情况。通过对平面形状样品和实际绝缘子样品进行试验,对比有无缺陷情况下的检测波形,证明了太赫兹方法是检测复合绝缘子内部缺陷的有效方法。

太赫兹技术在军事应用领域内的发展与潜力

太赫兹技术作为一种先进的前沿技术,对于军事发展来说是机遇也是挑战。本文论述了太赫兹技术、太赫兹的产生和探测以及太赫兹波的物理特性,总结分析了目前主流的太赫兹技术在军事领域内的应用,对航天飞机特种部件的无损检测、飞行器“黑障区”通讯、反导反隐身太赫兹雷达、太赫兹军事预警侦察、短距离地面战场保密通信和“6G”通信电子战等方面的军事应用展开了论述,为军事科学前沿研究人员快速掌握太赫兹军事应用的相关进展提供全景参考,提出太赫兹技术在军事应用方面具有巨大潜力。虽然距离稳定可靠的大规模使用还有一段距离,但应紧跟太赫兹科学技术的前沿,积极应对太赫兹技术给军事带来的机遇和挑战。

Current Trends and Perspectives of Detection and Location for Buried Non-Metallic Pipelines

Buried pipelines are an essential component of the urban infrastructure of modern cities.Traditional buried pipes are mainly made of metal materials.With the development of material science and technology in recent years,non-metallic pipes,such as plastic pipes,ceramic pipes,and concrete pipes,are increasingly taking the place of pipes made from metal in various pipeline networks such as water supply,drainage,heat,industry,oil,and gas.The location technologies for the location of the buried metal pipeline have become mature,but detection and location technologies for the non-metallic pipelines are still developing.In this paper,current trends and future perspectives of detection and location of buried non-metallic pipelines are summarized.Initially,this paper reviews and analyzes electromagnetic induction technologies,electromagnetic wave technologies,and other physics-based technologies.It then focuses on acoustic detection and location technologies,and finally introduces emerging technologies.Then the technical characteristics of each detection and location method have been compared,with their strengths and weaknesses identified.The current trends and future perspectives of each buried non-metallic pipeline detection and location technology have also been defined.Finally,some suggestions for the future development of buried non-metallic pipeline detection and location technologies are provided.

多胶接缺陷太赫兹检测信号的PSO-BP神经网络识别

采用太赫兹时域光谱无损检测技术对多胶接结构耐高温复合材料缺陷进行检测。为了识别同一位置上、下层同时存在脱粘缺陷,分析无缺陷区域、上层脱粘区域、下层脱粘区域的太赫兹信号波形,以特征峰峰度、偏度、最小值、峰谷值、波形因子以及信号幅值绝对平均值为特征,作为BP神经网络的输入。并通过粒子群算法优化BP神经网络的初始权重和阈值,解决了BP神经网络易陷入局部最优的问题。粒子群算法优化后的BP神经网络可实现上层100μm和下层100μm脱粘缺陷的识别,准确率达到90.71%和86.92%。

太赫兹技术在电力设备检测中的应用

根据太赫兹的定义出发,概括了太赫兹目前的发展现状,详细介绍了太赫兹的特性。根据太赫兹特征,文章对太赫兹目前的应用领域及相关技术进行了论述。并对太赫兹技术成像原理及相关设备进行了介绍。结合以上信息,最后文章对太赫兹在电力行业中的应用研究进行了探讨,并列举了太赫兹成像技术在电力设备检测中的应用方向。

基于InP工艺的小型化亚太赫兹人工表面等离子体激元传输线设计

提出了一种基于人工表面等离子体激元(SSPPs)的亚太赫兹片上传输线,并在InP工艺基础上对其进行了结构设计和实物加工。为减小传统矩形槽SSPPs结构的占地面积,提出了一种折叠型SSPPs结构,在相同的渐近频率下,该结构的占地面积缩小了57.2%。利用接地共面波导(GCPW)和阶梯渐变结构,实现了对SSPPs传输线的高效激励。利用太赫兹在片测试系统对该传输线进行了测试。测试结果表明,在110~170 GHz频带范围内,SSPPs传输线的插入损耗小于3 dB/mm,回波损耗优于12.5 dB,且实验结果与仿真结果具有较好的吻合度。