本文關鍵詞：多頻渦流檢測系統(tǒng)的設計　出處：《天津工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： HMC1043傳感器 多頻渦流檢測技術 STM32信號采集 電流源設計 矩形勵磁線圈設計

【摘要】：在當今工業(yè)安全生產中,人們發(fā)現(xiàn)軸類、壓力容器、核運行設備以及飛行器等容易出現(xiàn)斷裂、裂紋、氣泡等問題,這些微小的缺陷不僅造成了巨大的經濟損失,甚至導致災難性的事故。對缺陷的檢測有很多種方法,例如紅外檢測、X射線檢測、超聲檢測等,其中超聲波檢測是一種比較認可的檢測方法,但是因其不適合持續(xù)觀測缺陷的變化而發(fā)展受阻。因此,本課題提出了一種多頻渦流無損檢測的方法,不僅能夠對樣板缺陷進行持續(xù)觀測,而且具有靈敏度高、速度快、適用場合廣等優(yōu)點。該系統(tǒng)使用多頻渦流技術,利用空間磁場傳感器HMC1043對鋁板的表面及其近表面微小缺陷進行檢測,且能夠對缺陷的特征(長度、寬度、深度)進行表征。采集數據使用的芯片是STM32F103ZET6,將采集的數據使用串口上傳到上位機,同時在TFTLCD液晶顯示屏上對采集的數據進行實時顯示。本文首先介紹了電磁渦流的技術特點以及發(fā)展狀況,并對特殊探針的發(fā)展進程進行了詳細的介紹,結合實際的工程項目對電磁渦流檢測方法進行分析,確定實驗中無損檢測的方法。接著介紹系統(tǒng)的硬件、軟件的設計以及相關調試等。其中在硬件方面,設計了一種穩(wěn)定性與靈敏度較高的矩形線圈,可以在很大程度上提高檢測的靈敏度。最后使用該檢測系統(tǒng)對鋁板缺陷進行了掃描實驗,并對采集的結果進行分析。文中使用控制變量法分別討論了勵磁頻率以及缺陷幾何尺寸對掃描圖像的影響,同時也驗證了該系統(tǒng)能夠很好的檢測鋁板等材料的表面以及近表面的微小缺陷,對實際渦流無損檢測具有較高的參考價值。
[Abstract]:In today's industrial safety production, it is found that shafts, pressure vessels, nuclear equipment and aircraft are prone to fracture, cracks, bubbles and other problems, these tiny defects not only caused huge economic losses. There are many methods to detect defects, such as infrared X-ray detection, ultrasonic detection and so on, among which ultrasonic detection is a relatively recognized detection method. However, it is not suitable for continuous observation of defects and development is hindered. Therefore, a multi-frequency eddy current nondestructive testing method is proposed, which not only can be used for continuous observation of template defects, but also has high sensitivity. The system uses multi-frequency eddy current technology and the space magnetic field sensor HMC1043 to detect the small defects on the surface and near surface of aluminum plate. The chip used to collect data is STM32F103ZET6, which can upload the collected data to the host computer using serial port. At the same time, the data collected on TFTLCD LCD is displayed in real time. Firstly, the technical characteristics and development of electromagnetic eddy current are introduced in this paper. The development process of the special probe is introduced in detail, the electromagnetic eddy current testing method is analyzed in combination with the actual project, and the non-destructive testing method in the experiment is determined. Then, the hardware of the system is introduced. Software design and related debugging. In hardware, a kind of rectangular coil with high stability and sensitivity is designed. The sensitivity of the detection can be improved to a great extent. Finally, the scanning experiment of aluminum plate defects is carried out by using the detection system. The control variable method is used to discuss the effect of excitation frequency and defect geometry on the scanning image. At the same time, it is also proved that the system can detect the small defects on the surface and near surface of the aluminum plate and other materials, which has a high reference value for the practical eddy current nondestructive testing.
【學位授予單位】：天津工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP274

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