How do you calculate the time for running? Why is it so accurate? 12.09 seconds

The track and field competition determines the ranking of athletes through time. From the initial use of stopwatches to timing, and later the use of cameras, the results can be accurate to one hundredth of a second. The computer timing system now used in international competitions can accurately determine the results of the competition to one thousandth of a second.

With the slogan higher, faster, stronger, the results of contemporary track and field sports have developed to the point where they cannot be interpreted with the naked eye. Excellent sprinters have very high speeds in the 100-meter race. When they cross the finish line, their human eyes and nervous system are unable to judge and react to their rankings and results. The famous sprinter Carl Lewis, Miller, in The maximum speed in the 100-meter race has reached 12.05 meters/second. In high-level competitions, the top sprinters' scores are only 0.01 seconds apart. When they reach the finish line, we can't tell who is first, just like Liu Xiang and Johnson's 13.06 seconds in the Rome Golden League. The two hit the line almost at the same time, and in the end our finish camera system told us that Johnson was in the lead. Especially in major competitions like the Olympics, who wins the gold medal and who is first must have a basis, otherwise, it will be difficult to explain to the athletes! As performance develops, technology also advances, so we have a fully automatic track and field finish photography timing system.

This system makes reasonable judgments on our results and rankings. When the referee shouts "Everyone is in position", the start starting system starts to work and "prepare" which athlete starts to make the starting action. The false start system starts to work and tells the referee that several athletes are ahead in milliseconds. The starting point is a jump start. Generally speaking, if the force received by the starting block is greater than 25 kilograms, it will be judged as a jump start. When the starting gun was fired, the timing system started to work. When the athletes ran about 10 meters away from the finish line, the finish camera started to turn on and prepare to shoot. When the athletes crossed the finish line like a swarm, the camera captured them passing the finish line. Photo, and then use the end result interpretation system to determine the athlete's ranking and final score with accuracy to three decimal places. However, in the final announcement, only the last two digits are told, such as: 12 seconds 91. For athletes who hit the line almost at the same time, three decimal places will be used to determine the final ranking.

The IAAF stipulates that only electric timing results will be recognized for athletes’ official results and records. When an athlete breaks a record, the end-point photo should be retained for final verification. International competitions now use electric timing systems. The my country Athletics Association stipulates that electric timing systems must be used in national competitions of Category III and above. Athletes who reach the top level in sprint events must be electronically timed before they can be recognized.

At present, Switzerland's OMEGA and Japan's SEIKO are all electric timing systems recognized by the IAAF. The Olympic Games use one of the sponsors of the International Olympic Committee, Switzerland's SWATCH. (Swatch), this system can record the split time and maximum speed during the athlete's competition, and display the final score 15 seconds after the competition. In addition, our country uses the electric timing system produced by the Kunming Sports Electronics Research Institute in Yunnan, my country.

Science and technology is the primary productive force, and advanced technology has served mankind everywhere. Therefore, the theme of our Beijing Olympics is "Technology Olympics".