Loveday, Philip WLong, Craig S2013-01-302013-01-302012-04Loveday, PW and Long, CS. 2012. Scanning laser vibrometer measurement of guided waves in rails. 18th World Conference on Non-Destructive Testing, Durban, South Africa, 16-20 April 2012978-0-620-52872-6http://www.ndt.net/article/wcndt2012/papers/268_wcndtfinal00268.pdfhttp://hdl.handle.net/10204/649318th World Conference on Non-Destructive Testing, Durban, South Africa, 16-20 April 2012Guided wave based inspection and monitoring systems for railway tracks operate at frequencies where as many as 40 modes of propagation may exist. During the development of such systems it is advantageous to be able to measure the amplitude of the individual modes of propagation. The availability of scanning laser vibrometer systems has made it possible to measure the displacement or velocity at a large number of points on the rail surface. The contribution of each mode of propagation may be estimated from the measured frequency responses by using a pseudo-inverse technique and mode shape information computed from a semi-analytical finite element model. Scanning laser measurements were performed in the field at distances of 10m and 500m from a transducer used to transmit the guided waves. A scan of 430 measurement points was used to measure 25 modes at 40kHz.enGuided rail wavesMode measurementScanning laser vibrometerConference PresentationLoveday, P. W., & Long, C. S. (2012). Scanning laser vibrometer measurement of guided waves in rails. South African Institute for Non-Destructive Testing (SAINT). http://hdl.handle.net/10204/6493Loveday, Philip W, and Craig S Long. "Scanning laser vibrometer measurement of guided waves in rails." (2012): http://hdl.handle.net/10204/6493Loveday PW, Long CS, Scanning laser vibrometer measurement of guided waves in rails; South African Institute for Non-Destructive Testing (SAINT); 2012. http://hdl.handle.net/10204/6493 .TY - Conference Presentation AU - Loveday, Philip W AU - Long, Craig S AB - Guided wave based inspection and monitoring systems for railway tracks operate at frequencies where as many as 40 modes of propagation may exist. During the development of such systems it is advantageous to be able to measure the amplitude of the individual modes of propagation. The availability of scanning laser vibrometer systems has made it possible to measure the displacement or velocity at a large number of points on the rail surface. The contribution of each mode of propagation may be estimated from the measured frequency responses by using a pseudo-inverse technique and mode shape information computed from a semi-analytical finite element model. Scanning laser measurements were performed in the field at distances of 10m and 500m from a transducer used to transmit the guided waves. A scan of 430 measurement points was used to measure 25 modes at 40kHz. DA - 2012-04 DB - ResearchSpace DP - CSIR KW - Guided rail waves KW - Mode measurement KW - Scanning laser vibrometer LK - https://researchspace.csir.co.za PY - 2012 SM - 978-0-620-52872-6 T1 - Scanning laser vibrometer measurement of guided waves in rails TI - Scanning laser vibrometer measurement of guided waves in rails UR - http://hdl.handle.net/10204/6493 ER -