Apparatus and method for measuring torsion

A system for measuring at least one of direction, twist angle, torque and power on a rotating shaft, the system comprising:

• a first magnetic tape secured on the rotating shaft;
• a second magnetic tape secured on the rotating shaft a predetermined distance away from the first magnetic tape;
• a first magnetic sensor disposed proximate the first magnetic tape;
• a second magnetic sensor disposed proximate the second magnetic tape;
• and
• a computing device comprising a processor and memory in electrical communication with the first and second magnetic sensors, the memory for storing instructions for computing said at least one of twist angle, torque on the rotating shaft and power output from the rotating shaft,
• wherein the first and second magnetic sensors transmit sensor data to the computing device indicative of rotational speeds for the first magnetic tape and the second magnetic tape respectively, and a moving average time difference between edge transitions between the sensors, and wherein the computing device computes, by using the transmitted sensor data, at least one of the twist angle, torque on the rotating shaft and the power output from the rotating shaft.