Checking of Combustion Chamber of Liquid Rocket Using ECT with AMR Sensor

摘要：

　　Using the eddy current testing(ECT)system with AMR sensor developed by us,we tested a liquid rocket combustion chamber specimen.The signals produced by the cooling grooves reduced the signal-to-noise ratio and limited the smallest defect that can be detected.We developed an FFT(Fast Fourier Transform)method to reduce the influence of the coolant channel signals.We first made the FFT for the scanning result; and set the values of some frequencies and their harmonics to Zero(The frequencies are determined by the periodic cooling grooves signals); then made the inverse FFT(IFFT)of the spectrum.The results proved that this method was effective to reduce the influence of the cooling groove signals and the signal-to-noise ratio was improved.

作者: D.F.He M.Shiwa S.Moriya

作者单位: National Institute for Materials Science,Sengen 1-2-1,Tsukuba 305-0047,Japan Japan Aerospace Exploration Agency,Kakuda,Miyagi,Japan

会议类型: 国际会议

会议名称: Progress in Electromagnetics Research Symposium 2013(2013年电磁学研究新进展学术研讨会)

会议地点: 台北

会议语种:英文

页码: 261-263

在线出版日期: 2013-03-01（万方平台首次上网日期，不代表论文的发表时间）