title: Development of eddy current testing system for inspection of combustion chambers of liquid rocket engines.
abstract: An eddy current testing (ECT) system using a high sensitive anisotropic magnetoresistive (AMR) sensor was developed. In this system, a 20 turn circular coil with a diameter of 3 mm was used to produce the excitation field. A high sensitivity AMR sensor was used to measure the magnetic field produced by the induced eddy currents. A specimen made of copper alloy was prepared to simulate the combustion chamber of liquid rocket. Scanning was realized by rotating the chamber with a motor. To reduce the influence of liftoff variance during scanning, a dual frequency excitation method was used. The experimental results proved that ECT system with an AMR sensor could be used to check liquid rocket combustion chamber.
authors: National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, Japan.
authors: D F
authors: DF
authors: He
authors: Y Z
authors: YZ
authors: Zhang
authors: M
authors: M
authors: Shiwa
authors: S
authors: S
authors: Moriya