JoeyJoJo
Thursday, July 16th, 2009, 7:54 AM
QUOTE (DrawingDeadInDM @ Thursday, July 16th, 2009, 8:50 AM)

I've got absolutely no idea what a 'smart football' would cost, but I would think with the number of footballs you'd need per game per week per season that it could be cost prohibitive if they were 3, 4, 5k a piece*. Also, would they always function perfectly in the bitter cold?
*This is not an estimate of the cost of a smart ball.
From TMQ:
Brad Riddle, a senior engineering student at Lehigh University, proposes this concept:
"The system must meet a few requirements. The first is there has to be a way that the ball can be sensed crossing the plane within about one millimeter, less than a tenth of an inch. The second is that it does this irrespective of players in the way of the signal. The third is that the ball cannot have its physical characteristics changed so much that the ball feels different -- the problem the NBA ran into with its new ball. The fourth is that anything added to the ball has to survive being tossed, kicked and spiked in a celebration dance.
"One solution would be to have a radio or microwave transmitter in the ball that would emit a signal and a mounted receiver, with a thin slot facing down the goal line. One of the main problems with this method would be the need to have a broadcasting frequency that could penetrate the human body, like a cell phone or wireless internet antenna that can also fit through a 1 mm slot. This solution does, however, allow any part of the ball to cross the plane of the goal line and set off the detector. Another solution would be to put a wider detector underneath the goal line of the field. In this case, there is a larger opening so a signal emitted from the ball would be able to get through. By lining the area with iron, only signals from the right direction (nearly straight up) could be detected.
"A big issue is that the ball would have to have a radio transmitter inside, though a weight of an ounce or two could be achieved because the signal power could be low. The only electronics would be a battery and something to generate the signal and some encoded information to prevent interference. Another problem is that if the ball is up in the air and in front of the goal line, the signal might be detected because the line from the receiver to the ball would not pass through the metal barrier. The solution to this would be to put the antenna deeper under the field so that unless the ball is seven or eight feet up in the air the system works. By putting the receiving antenna underground, if the field above it gets wet, the ability for the wave to get through will be lowered. This problem would mean increasing the power of the signal, which decreases the lifetime of the ball. This second solution seems to meet the initial criteria. If any part of the ball (with antenna in the seams) crosses over the buried metal edge of the goal line, a detection would be registered. The transmitted signal can be made so that it goes through the human body. The hardware inside of the ball could be balanced in such a way it does not change the physical characteristics of the ball. The type of hardware required for a transmitter is robust enough to survive the conditions a ball goes through during a game.
"If the NFL would consider doing this, the development cost, the implementation cost and the reliability could be issues. The development cost could be as high as several million dollars, the installation just as high. Also, the price per ball would be increased by $10-$15 per ball, and could only be used for a few series before the battery ran out. A system like this could be feasible if the NFL thought it was worth it to spend money on electronics R&D for something that is unproven, and the players (quarterbacks and kickers) could be convinced that the electronics in the ball did not alter its performance.
"This solves the problem in concept at least; the next stage would be proof of concept. And yes, I am looking for a job after graduation."