March 10, 2009
Technology Could Help Skiers, Coaches
A skier gives her all, closely races past the gates in the giant slalom to the final stretch. Yet, upon reaching the bottom, the disappointment is great: Too slow once again. How come? Until now, coaches and athletes have analyzed videos to identify weaknesses in technique. "An analysis was based more on instinct than concrete measured values," explains Dr. Klaus Richter, Expert Group Manager at the Fraunhofer Institute for Factory Operation and Automation IFF in Magdeburg.
In the future, transponders "“ radio transmitters and receivers "“ will support coaches in their work. They can be attached to an athlete's skis and transmit radio waves in every direction through small antennas one thousand times per second. The antennas are located to the front and the back of the skis. Receiving stations placed alongside a slope in regular intervals pick up the signals and analyze the time a signal needs to travel from the antenna to a station, thus accurately determining an antenna's position within three centimeters. The underlying technology is radio frequency identification or RFID. A computer calculates the position of the skis every millisecond and displays their exact path on a monitor. "A coach recognizes whether both skis were parallel," explains Richter, "whether the skier has drifted from her path in a curve and whether she is able to carve properly." Carving involves taking the turns entirely on the edge of one's skis.
Image Caption: Small radio transmitters on skis provide information on whether the skis were parallel during a run for instance. Credit: Ã© Dirk Mahler / Fraunhofer IFF
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