TORQUE TRANSDUCERS, TORQUE SENSORS AND TORQUE METERS: DEFINITION
TRANSFER REFERENCE TORQUE TRANSDUCER
The term torque meter refers to an instrument used to measure a torque, i.e. the product of a force and a lever arm.
A static torque meter or torque transducer is composed of a transducer comprising a steel proof body which receives the torque to be measured and is deformed elastically by application of this force. In modern transducers, such deformation (strain) is connected to a miniature electric circuit attached to the proof body, resulting in the modification of the electrical resistance. This resistance variation is measured by the Wheatstone bridge method, whereby two legs of the electrical circuit are supplied with an analogue voltage – either continuous or intermittent. An analogue variable voltage depending on the force applied to the torque transducer is collected between two other legs in the circuit.
From the mechanical theory point of view, torque is a vectorial input which must be taken into account by the precision measures, as well as other mechanical laws, such as action and reaction principles, action at a distance, etc. This approach leads to the adoption of a number of precautions, both in the design and use of a torque meter.
NOTE : Spanish version /en/tecnologia/esfuerzo-de-torsion/gama-de-par