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Torque is measured by either sensing the actual shaft deflection caused by a twisting force, or by detecting the effects of this deflection. To measure torque, strain gage elements usually are mounted in pairs on the shaft.
The surface of a shaft under torque will experience compression and tension, as shown in the Figure
Torque Applications
Applications for torque measurements include determining the amount of power an engine, motor, turbine, or other rotating devices. In the industrial world, ISO 9000 and other quality control specifications are requiring companies to measure torque during manufacturing, especially when fasteners are applied.
To measure the torque, a strain gage will be installed directly on the shaft. The torque sensor will be connected to its power source and signal conditioning electronics. The signal is converted to a modulated pulse frequency and wireless picked up from the rotating shaft. After demodulation, the signal will be integrated and averaged.
In addition, together with the shaft speed and some specific shaft parameters we provide the actual shaft ( horse ) power.

Maximum speed of such an arrangement is 15,000 rpm.

To measure torque, strain gage elements usually are mounted in pairs on the shaft.

Torsional vibration measurements

Torsional vibration is an oscillation of angular position about a centerline, and is caused by oscillating torque forces.

Torsional vibration can cause failures in all types of machinery. Potential problems include cracked shafts, coupling damages and excessive gear wear are only examples.