It's a sensor that turns vibrations into electrical energy, called a piezoelectrical device, similar to that used in a hi-fi speaker or microphone. It's attached to the top of the net and detects when it vibrates, to see whether a serve should be called a let or not

Online scoreboard
This is the new scoreboard at Wimbledon will tell readers where the two players are winning and losing the match. By examining the pattern of play, the technology establishes three "keys to the match" - for example, first serve percentages, rallies won in fewer than three strokes, or ground covered. The information is gathered by IBM's PointStream technology, and is compared to five years' worth of data from past Wimbledon’s  and the other three Grand Slams, a total of almost 40 million points played. During play, live results and player performance are compared against the suggested keys and results are displayed online in a visual representation of the match which allows users to see, in an instant, the state of play.

This technology has been used in arenas and events such as Wimbledon 

Light-weight frames are a necessity for wheelchairs used in sports requiring sharp, fast turns and overall agility, such as tennis, basketball, and racing.

Chairs with reinforced frames and impact protection are required for contact sports, such as wheelchair rugby or basketball. 

Racing chairs are designed with bucket seats, angled wheels for improved stability, and a t-frame with a third wheel in front, allowing precision steering as well as improving balance. The athlete and wheelchair are viewed together by some sport researchers as a unified performance system. Improvements can be made to chairs by evaluating the chair and athlete separately or in performance conditions together.

TMO is someone who watches the match action on TV screens, usually in a truck outside the ground. Using a system called Hawk-Eye, they can see multiple camera angles of an incident and pass on information to the match referee – via an earpiece – to help him make accurate decisions.

Used in Rugby when: 

-scoring of a try

-also to help to ascertain whether a kick went between the posts

-possible foul play 

-by medical staff when assessing injuries and safety within game 

The footage recorded is shown on a big screen inside the ground. Ref can ask the TMO to look at an incident, either while the game continues or after stopping play.

-People have complained that TMO interrupts games. 

-Referees can be put under far more pressure to act by the aggressive reaction of a home crowd that watches an incident involving a visiting player on the big screen

Competitive athletes or simply “serious amateurs”—can benefit from the technological advances in innovative sports prosthetics. A good example is the Cheetah Xtend, a carbon fiber blade designed for below-the-knee amputee runners. A similar version, the Cheetah Xtreme, is a blade geared specifically to high-speed, short distance running. Its “Xtreme” curving shape provides the dynamic flexing and push-off needed for sprinting.

Rugby players’ apparel has changed more than in most sports over the last 15 years or so. At the elite level, the heavy cotton jerseys that were once ubiquitous are not so popular. In their place are lighter, synthetic tops that are aerodynamic and wick sweat away. They are also less easy to tug effectively.