How the speed of the ball is measured? & How do the LED stumps work?

Some of the fastest bowlers in the world 

As we all know cricket is a game of pace. Faster the bowler bowls, more lethal he is considered. In live cricket matches we see the speed/pace of the ball is shown on our screen immediately after bowler completes the delivery of the ball.

There are some technologies used to determine the speed of the ball:

1. Speed gun:

General mounting of speed gun

There is a speed gun mounted on a pole near the sight screen right near the boundary line. It works on the principle of "Doppler Effect". It is similar to measure the speed of a moving car. Now, to measure the speed of the ball it has two components: Transmitter & receiver. Transmitter sends the radio signals toward the pitch which records the movements and receiver calculates the speed of any object near the pitch. 

The speed recorded by speed gun is inserted into image processing software. This software identifies the ball among other objects and shows its speed on the display.

22/02/2003 Shoaib Akhtar bowls the fastest ball in the world against England in 2003 World Cup match.

2. Radar Gun:

Radar gun uses SONAR technology and it also works in similar manner. It records the radio waves that is created by ball as it travels through the air. It simplifies the waves and speed is shown on the screen.

Working of LED in the stumps:

LED bails flashing when the contact between them and the stumps is broken.

In the generation of modernization, we have seen many developments in cricket specifically related to equipments. For example, the bats have become more meaty and heavy as compared to past. The stumps used in cricket are also the part of this modernization. As we all know there are LED stumps used all over the world in cricket matches.

The stumps and bails are traditionally made from wood, but the stumps and bails nowadays are made from composite plastics which have LEDs mounted on it. There are hidden low voltage batteries which provide the required power supply to the small LEDs. There is a microprocessor which detects the movement of the bails and the stumps and the LED flashes only when the contact between bails and the stumps is broken completely. 

This system is very expensive and hence in today's world it is not feasible for the ICC to allow a player to take the stump home as a souvenir after winning the game.

Thanks 

Rahul












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