Patent ID: 7093504

Claim:
A method of measuring torque, said method comprising: providing a first rotating disk, said first rotating disk having a target pattern, providing a second rotating disk, said second rotating disk having a target pattern, providing a first set of at least three sensors, said first set comprised of a first disk first sensor, a first disk second sensor, a first disk third sensor, said first set of at least three sensors for sensing said first rotating disk target pattern, said first set of at least three sensors fixed around and encompassing said first rotating disk, providing a second set of at least three sensors, said second set comprised of a second disk first sensor, a second disk second sensor, a second disk third sensor said second set of at least three sensors for sensing said second rotating disk target pattern, said second set of at least three sensors fixed around and encompassing said second rotating disk, measuring an apparent twist of said first rotating disk relative to said second rotating disk with said first set of at least three sensors and said second set of at least three sensors, determining an actual twist angle θ twist from said measured apparent twist, said method including providing a sensor cradle for fixing the position of said first set of at least three sensors and said second set of at least three sensors, with said first disk first sensor positioned adjacent said second disk first sensor, said first disk second sensor positioned adjacent said second disk second sensor, and said first disk third sensor positioned adjacent said second disk third sensor.