隔热板的太赫兹无损检测研究

发布时间：2018-06-22 03:32

本文选题：太赫兹 + 隔热瓦　；参考：《华中科技大学》2015年硕士论文

【摘要】：陶瓷纤维隔热瓦具有轻质、耐高温、低热导率等优点,是目前航空、航天飞行器最主要的热防护材料,隔热瓦与飞行器外壳之间的漏粘、脱粘等情况会极大地影响隔热瓦的热防护性能。太赫兹波具有高光谱分辨率、透视性、安全性等特点,能够有效地检测并识别被测物体内部的缺陷,弥补传统无损检测手段在检测隔热瓦与飞行器之间粘接质量方面的不足。围绕太赫兹波无损检测技术在检测隔热瓦粘接质量方面的应用,本论文主要包括以下几个方面的内容:针对隔热瓦粘接质量的检测,分析了超声、X射线检测等传统检测方法的局限性,并探讨太赫兹波成像技术在无损检测方面的优势。介绍本课题所使用的实验装置,即SynViewScan300调频连续太赫兹波成像系统。首先是系统所采用的太赫兹源、探测器并阐述其成像原理,然后具体分析系统层析成像的实现,最后对提高测距精度方法的进行理论分析。对太赫兹波性质和SynViewScan300系统性能进行测试。分析不同介质对太赫兹波的反射、透射和吸收特性;测试系统的空间分辨率并分析其影响因素,以及系统在识别物体内部夹杂物方面的可行性。制作隔热瓦多层粘接结构样件,并设计不同缺陷模拟实际样件可能出现的缺陷情况,对样件进行检测并由检测结果分析太赫兹波无损检测技术甄别不同缺陷的能力。本论文研究内容为太赫兹无损检测技术在隔热板粘接质量的检测方面的应用提供了理论和实验依据。
[Abstract]:Ceramic fiber thermal insulation tile has the advantages of light weight, high temperature resistance, low thermal conductivity and so on. It is the most important thermal protection material for aeronautical and spaceflight vehicles, and the leakage of viscosity between the thermal insulation tile and the outer shell of the aircraft. Debonding and other conditions will greatly affect the thermal protection performance of the thermal insulation tile. Terahertz wave has the characteristics of high spectral resolution, perspective, safety and so on. It can effectively detect and identify the internal defects of the object under test, and make up for the shortcomings of traditional nondestructive testing methods in detecting the bonding quality between the thermal insulation tile and the aircraft. Around the application of terahertz wave nondestructive testing technology in testing the bonding quality of thermal insulation tiles, this paper mainly includes the following aspects: testing the bonding quality of thermal insulation tiles, The limitations of traditional testing methods, such as ultrasonic X-ray testing, are analyzed, and the advantages of terahertz wave imaging in nondestructive testing are discussed. This paper introduces the experimental device, Synview Scan300 FM CW terahertz imaging system. First, the terahertz source used in the system is used, and the imaging principle of the detector is described. Then, the realization of the system tomography is analyzed in detail. Finally, the theoretical analysis of the method to improve the ranging accuracy is carried out. The properties of terahertz wave and the performance of SynViewScan300 system were tested. The reflection, transmission and absorption characteristics of terahertz waves in different media are analyzed, the spatial resolution of the system is measured and the influencing factors are analyzed, as well as the feasibility of the system in identifying inclusions inside the object. In this paper, the thermal insulation layer bonded structural samples are made, and different defects are designed to simulate the possible defects in the actual samples. The samples are tested and the ability of THz wave nondestructive testing technology to identify different defects is analyzed by the test results. This paper provides theoretical and experimental basis for the application of terahertz nondestructive testing technology in the testing of adhesive quality of heat insulation plate.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.758.21

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