Torque measurement uses acoustic surface waves
The TorqueSense technology, designed for industrial applications, consists of an element that detects acoustic surface waves. For this purpose, a ceramic substrate is excited at a certain frequency. Torque changes cause this frequency to change also which can be detected and processed very exactly. The output signal – a current, voltage, RS232 or USB signal – is transferred contactlessly from the rotating shaft to the receiver. Thus, the complex and failure-prone installation of strain gauges may be dropped.
Another TorqueSense advantage is that it offers a significantly lower signal noise than strain gauge which typically use collector rings for signal transmission. TorqueSense offers a very broad measurement range from 1 to 13.000 Nm and is usable at rotational speeds up to 30.000 rpm.
First applications have been installed in fields like power measurement of motors and testing of pumps of various sizes. In other applications the torque measurement is used to draw conclusions to other physical values. For instance it is used in research labs where the viscosity of substances is determined by means of stirrers, with a torque sensor attached to the stirrer shaft. Other application fields range from torque measurements at underwater turbines to the safe screw connection of medicine bottles.