Standard method for detection of magnetic defects in aircraft engine discs using a HTS SQUID gradiometer
Standard method for detection of magnetic defects in aircraft engine discs using a HTS SQUID gradiometer
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使用 HTS SQUID 梯度计检测飞机发动机盘中磁性缺陷的标准方法
DOI：
10.1109/77.783857
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发表时间：
1999
影响因子：
1.8
通讯作者：
J. Hinken
中科院分区：
文献类型：
--
作者：
Y. Tavrin;M. Siegel;J. Hinken
我们开发了一种新的高灵敏度磁性方法，用于对飞机发动机盘中的小铁质夹杂物进行无损检测 (NDT)。该测量方法基于使用三个薄膜超导量子干涉仪（SQUID）作为磁传感器的二阶梯度仪。底座长度为 60 mm 的梯度计装置的高度平衡确保了测量系统在没有磁屏蔽的情况下能够极其稳定地抵抗外部干扰。同时局部磁场的分辨率很高，约为130 fT/Hz/sup 1/2/。该系统适用于技术部件的无损检测，特别适用于大尺寸零件的大深度检测。使用这种新方法，可以确定非磁性合金中磁性夹杂物的位置、深度和尺寸。该方法被用作航空发动机盘生产质量控制的标准测试程序。
We have developed a new high sensitive magnetic method for non-destructive testing (NDT) of small ferrous inclusions in aircraft engine discs. The measuring method is based on a second order gradiometer using three thin film Superconducting Quantum Interferometer Devices (SQUIDs) as magnetic sensors. The high balance of the gradiometer setup with a base length of 60 mm insures that the measuring system is extremely stable against external disturbances without having a magnetic shield. At the same time the resolution of the local magnetic field is high, about 130 fT/Hz/sup 1/2/. The system is suitable for NDT of technical components, especially for tests into large depth of parts with large size. Using this new method, the location, depth and size of magnetic inclusions in non-magnetic alloys can be determined. The method is used as a standard testing procedure in production quality control of aircraft engine discs.