Researchers in the University of Warwick’s Department of Physics have developed a novel non-contact method of using ultrasound to detect and measure cracks and flaws in rail track – particularly gauge corner cracking - that has the potential to simply be attached to a normal passenger or freight train travelling at high speeds.
Current ultrasonic techniques for detecting defects only work at much slower speeds (around 20-30 miles an hour). A handful of special trains have been created using conventional contacting ultrasonic techniques but there are severe limitations as to when and where they can be used without disrupting the network. The new technology, developed by Dr Steve Dixon, Dr Rachel Edwards and Mr John Reed at the University of Warwick, makes use of a particular form of ultrasonics – a “low frequency wide band Rayleigh wave” to produce a crack testing technique that works at high speed and could transform every train in the country into part of a 24 hour network of rail crack detectors.
The researchers have taken pairs of “electromagnetic acoustic transducers” (EMATS) which generate and detect the “low frequency wide band Rayleigh wave” on the rail without touching the rail. This Rayleigh wave travels along the surface of the rail head, along the length of the rail, penetrating down to a depth of several millimetres. They simultaneously use a wide range of frequencies within a single Rayleigh wave pulse (hence their description of it as a “wide band Rayleigh Wave”) as different frequencies allow penetration of the rail to a range of precise measurable depths.
Peter Dunn | alfa
New players, standardization and digitalization for more rail freight transport
16.07.2018 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
A helping (Sens)Hand
11.04.2018 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO
Innsbruck quantum physicists have constructed a diode for magnetic fields and then tested it in the laboratory. The device, developed by the research groups led by the theorist Oriol Romero-Isart and the experimental physicist Gerhard Kirchmair, could open up a number of new applications.
Electric diodes are essential electronic components that conduct electricity in one direction but prevent conduction in the opposite one. They are found at the...
Max Planck researchers revel the nano-structure of molecular trains and the reason for smooth transport in cellular antennas.
Moving around, sensing the extracellular environment, and signaling to other cells are important for a cell to function properly. Responsible for those tasks...
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
19.11.2018 | Event News
09.11.2018 | Event News
06.11.2018 | Event News
21.11.2018 | Life Sciences
21.11.2018 | Power and Electrical Engineering
21.11.2018 | Life Sciences