Noncontact Mobile Sensing For Absolute Stress In Rail Using Photoluminescence Piezospectroscopy

Keywords

absolute stress measurement; Continuous welded rail; noncontact sensing; photoluminescence piezospectroscopy; thermite welding; α-Al O 2 3

Abstract

A novel noncontact, mobile sensing technique to measure absolute stress in rail using photoluminescence piezospectroscopy is presented. Photoluminescence piezospectroscopy is a vibrational spectroscopy technique for chemical identification and stress measurement by focusing low-power laser on a substance surface. Thermite welding is a major welding method for continuous welded rail, which produces iron (Fe) and aluminum oxides (Al2O3) after aluminothermic reaction. Photoluminescence piezospectroscopy was used as a noncontact stress sensing method since photoluminescence piezospectroscopy has an excellent detectability for alpha-phase aluminum oxide (α-Al2O3). Using a portable photoluminescence piezospectroscopy system, a prominent α-Al2O3 signal was collected from the bare surface of thermite weld samples. A loading frame test was conducted to determine the piezospectroscopic coefficient of α-Al2O3 in thermite weld. A pulverization method is introduced to determine absolute stress from an existing rail sample. The experimental results show many advantages of this method over traditional methods to measure stress in rail as a mobile sensing method.

Publication Date

9-1-2018

Publication Title

Structural Health Monitoring

Volume

17

Issue

5

Number of Pages

1213-1224

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1177/1475921717742102

Socpus ID

85042133561 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85042133561

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