Method and apparatus for torque measurement

Details Method and apparatus for torque measurement Method and apparatus for torque measurement

G - Physics

01

L

G01L 3/00 (2006.01)

Patent

CA 2295405

A method for measuring the torque in a shaft 10 using the acousto-elastic effect. An electromagnetic acoustic transducer (EMAT) 14 generates two orthogorial wave pulses 5 which propagate along the surface of the shaft at ~ 45° to the shaft's longitudinal axis 4 and are detected by a second EMAT 16. The two waves travel along the lines of principal tensile 1 and compressive 2 stress and their velocity is therefore affected by applied torque such that the difference in their velocity is a measurement of the torque applied to the shaft 10.

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