Multi-frequency least squares demodulation method in electromagnetic rail inspection

Author

Ran Zheng ; Ze Liu ; Yingfei Lu ; Lixiong Zhu ; Xiufang Sun

Author_Institution

Sch. of Electron. & Inf. Eng., Beijing Jiaotong Univ., Beijing, China

fYear

2013

fDate

22-23 Oct. 2013

Firstpage

363

Lastpage

365

Abstract

As a result of the development of higher speed and heavier load of rail networks, rail defects have been more serious than ever before. This paper introduces the least squares method (LSM) to demodulate multi-frequency signals in electromagnetic rail inspection using eddy current detection. The demodulation speed of LSM is faster than other methods because it can estimate frequencies with one time matrix calculation. Furthermore, its calculation complexity is less than other demodulation methods like FFT and fast correlation. Consequently, this method can improve the demodulation speed without decrease the demodulation accuracy. And it will be used as ideal demodulation algorithm for online real time multi-frequency electromagnetic rail inspection.

Keywords

demodulation; eddy currents; fast Fourier transforms; inspection; least squares approximations; matrix algebra; mechanical engineering computing; railway safety; signal detection; FFT; LSM; eddy current detection; electromagnetic rail inspection; frequency estimation; multifrequency least squares demodulation method; rail defect; rail network; time matrix calculation; Algorithm design and analysis; Coils; Demodulation; Eddy currents; Inspection; Rails; eddy current detection; electromagnetic rail inspection; least squares method; multi-frequency demodulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Imaging Systems and Techniques (IST), 2013 IEEE International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4673-5790-6

Type

conf

DOI

10.1109/IST.2013.6729722

Filename

6729722