Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: Olympic data

On Tue, 24 Aug 2004, John Mallinckrodt wrote:

Probably the worst part of this definition is that the circumstances
in different races--and even different lanes in the SAME race--can't
be controlled well enough. In particular, one would like a least to
believe that the distance between "the starting block" (whatever THAT
means) and the finish line is reproducible to within something like
[(.01 s)/(10 s)] * 100 m = 10 cm.

The track certification process is managed by the IAAF. The distances are
measured from the start line to the finish line. The specifications for a
certified 400 m course requires that the distance be verified using a
minimum of 28 measurements. They recommend 24 radius measurements which
cannot vary from the specified distance by more than .005 meters.
Specifications for level, lane width, curbs etc are also provided.

Seiko is a big name in timing track events. The start of the clock is
linked to the "starters pistol" with a quartz timer and photo finish
apparatus. The finish is recorded using a slit video photo finish system.
It is claimed to be accurate to .001 seconds.
has an example of the types of technology employed in timing individual

Bruce Esser
Physics Teacher Something witty
Marian High School Should go here