International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428615100175

Design and Application of Card-Type Eddy Current Sensor

Fengying Huang^1,a, Yongwei Huang¹, Junming Lin² and Meng Qu^{3 1}China Academy of Railway Sciences Metal and Chemistry Institute, Beijing, 100081, China. ^chfyfeng@163.com ²Eddysun (Xiamen) Electronic Co. Ltd, Xiamen, 361008, China. ³China Academy of Railway Sciences Standards & Metrology Research Institute, 100081, Beijing, China.

ABSTRACT

There are great difficulties to test switch rail surface because of its continuous variable cross-section. A card-type eddy current sensor was developed, and used to test the narrow space located at the inner surface of switch rail. The sensor comprises an elastic non-metallic sheet, multiple detection coils and a single thin magnet. It fits well with the switch rail for its magnet sheet to reduce lift-off effect, and the detection sensitivity is improved. The thickness of the sensor is only 0.8mm, and can be used to test the inner surface defects of turnout between switch rail and stock rail. The experimental results show that the sensor meets the testing demands of the switch rails.

Keywords: Eddy current testing, Turnout, Switch rail, Sensor design.

---

Back to TOC

FULL TEXT(PDF)